added golang

backend/vendor/github.com/apex/log/.gitignore

@@ -0,0 +1 @@
+.envrc

backend/vendor/github.com/apex/log/History.md

@@ -0,0 +1,12 @@
+
+v1.1.1 / 2019-06-24
+===================
+
+  * add go.mod
+  * add rough pass at apexlogs handler
+
+v1.1.0 / 2018-10-11
+===================
+
+  * fix: cli handler to show non-string fields appropriately
+  * fix: cli using fatih/color to better support windows

backend/vendor/github.com/apex/log/LICENSE

@@ -0,0 +1,22 @@
+(The MIT License)
+
+Copyright (c) 2015 TJ Holowaychuk tj@tjholowaychuk.com
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

backend/vendor/github.com/apex/log/Makefile

@@ -0,0 +1,2 @@
+
+include github.com/tj/make/golang

backend/vendor/github.com/apex/log/Readme.md

@@ -0,0 +1,29 @@
+
+![Structured logging for golang](assets/title.png)
+
+Package log implements a simple structured logging API inspired by Logrus, designed with centralization in mind. Read more on [Medium](https://medium.com/@tjholowaychuk/apex-log-e8d9627f4a9a#.rav8yhkud).
+
+## Handlers
+
+- __cli__ – human-friendly CLI output
+- __discard__ – discards all logs
+- __es__ – Elasticsearch handler
+- __graylog__ – Graylog handler
+- __json__ – JSON output handler
+- __kinesis__ – AWS Kinesis handler
+- __level__ – level filter handler
+- __logfmt__ – logfmt plain-text formatter
+- __memory__ – in-memory handler for tests
+- __multi__ – fan-out to multiple handlers
+- __papertrail__ – Papertrail handler
+- __text__ – human-friendly colored output
+- __delta__ – outputs the delta between log calls and spinner
+
+---
+
+[![Build Status](https://semaphoreci.com/api/v1/projects/d8a8b1c0-45b0-4b89-b066-99d788d0b94c/642077/badge.svg)](https://semaphoreci.com/tj/log)
+[![GoDoc](https://godoc.org/github.com/apex/log?status.svg)](https://godoc.org/github.com/apex/log)
+![](https://img.shields.io/badge/license-MIT-blue.svg)
+![](https://img.shields.io/badge/status-stable-green.svg)
+
+<a href="https://apex.sh"><img src="http://tjholowaychuk.com:6000/svg/sponsor"></a>

backend/vendor/github.com/apex/log/default.go

@@ -0,0 +1,45 @@
+package log
+
+import (
+	"bytes"
+	"fmt"
+	"log"
+	"sort"
+)
+
+// field used for sorting.
+type field struct {
+	Name  string
+	Value interface{}
+}
+
+// by sorts fields by name.
+type byName []field
+
+func (a byName) Len() int           { return len(a) }
+func (a byName) Swap(i, j int)      { a[i], a[j] = a[j], a[i] }
+func (a byName) Less(i, j int) bool { return a[i].Name < a[j].Name }
+
+// handleStdLog outpouts to the stlib log.
+func handleStdLog(e *Entry) error {
+	level := levelNames[e.Level]
+
+	var fields []field
+
+	for k, v := range e.Fields {
+		fields = append(fields, field{k, v})
+	}
+
+	sort.Sort(byName(fields))
+
+	var b bytes.Buffer
+	fmt.Fprintf(&b, "%5s %-25s", level, e.Message)
+
+	for _, f := range fields {
+		fmt.Fprintf(&b, " %s=%v", f.Name, f.Value)
+	}
+
+	log.Println(b.String())
+
+	return nil
+}

backend/vendor/github.com/apex/log/doc.go

@@ -0,0 +1,10 @@
+/*
+Package log implements a simple structured logging API designed with few assumptions. Designed for
+centralized logging solutions such as Kinesis which require encoding and decoding before fanning-out
+to handlers.
+
+You may use this package with inline handlers, much like Logrus, however a centralized solution
+is recommended so that apps do not need to be re-deployed to add or remove logging service
+providers.
+*/
+package log

backend/vendor/github.com/apex/log/entry.go

@@ -0,0 +1,172 @@
+package log
+
+import (
+	"fmt"
+	"os"
+	"strings"
+	"time"
+)
+
+// assert interface compliance.
+var _ Interface = (*Entry)(nil)
+
+// Now returns the current time.
+var Now = time.Now
+
+// Entry represents a single log entry.
+type Entry struct {
+	Logger    *Logger   `json:"-"`
+	Fields    Fields    `json:"fields"`
+	Level     Level     `json:"level"`
+	Timestamp time.Time `json:"timestamp"`
+	Message   string    `json:"message"`
+	start     time.Time
+	fields    []Fields
+}
+
+// NewEntry returns a new entry for `log`.
+func NewEntry(log *Logger) *Entry {
+	return &Entry{
+		Logger: log,
+	}
+}
+
+// WithFields returns a new entry with `fields` set.
+func (e *Entry) WithFields(fields Fielder) *Entry {
+	f := []Fields{}
+	f = append(f, e.fields...)
+	f = append(f, fields.Fields())
+	return &Entry{
+		Logger: e.Logger,
+		fields: f,
+	}
+}
+
+// WithField returns a new entry with the `key` and `value` set.
+func (e *Entry) WithField(key string, value interface{}) *Entry {
+	return e.WithFields(Fields{key: value})
+}
+
+// WithError returns a new entry with the "error" set to `err`.
+//
+// The given error may implement .Fielder, if it does the method
+// will add all its `.Fields()` into the returned entry.
+func (e *Entry) WithError(err error) *Entry {
+	ctx := e.WithField("error", err.Error())
+
+	if s, ok := err.(stackTracer); ok {
+		frame := s.StackTrace()[0]
+
+		name := fmt.Sprintf("%n", frame)
+		file := fmt.Sprintf("%+s", frame)
+		line := fmt.Sprintf("%d", frame)
+
+		parts := strings.Split(file, "\n\t")
+		if len(parts) > 1 {
+			file = parts[1]
+		}
+
+		ctx = ctx.WithField("source", fmt.Sprintf("%s: %s:%s", name, file, line))
+	}
+
+	if f, ok := err.(Fielder); ok {
+		ctx = ctx.WithFields(f.Fields())
+	}
+
+	return ctx
+}
+
+// Debug level message.
+func (e *Entry) Debug(msg string) {
+	e.Logger.log(DebugLevel, e, msg)
+}
+
+// Info level message.
+func (e *Entry) Info(msg string) {
+	e.Logger.log(InfoLevel, e, msg)
+}
+
+// Warn level message.
+func (e *Entry) Warn(msg string) {
+	e.Logger.log(WarnLevel, e, msg)
+}
+
+// Error level message.
+func (e *Entry) Error(msg string) {
+	e.Logger.log(ErrorLevel, e, msg)
+}
+
+// Fatal level message, followed by an exit.
+func (e *Entry) Fatal(msg string) {
+	e.Logger.log(FatalLevel, e, msg)
+	os.Exit(1)
+}
+
+// Debugf level formatted message.
+func (e *Entry) Debugf(msg string, v ...interface{}) {
+	e.Debug(fmt.Sprintf(msg, v...))
+}
+
+// Infof level formatted message.
+func (e *Entry) Infof(msg string, v ...interface{}) {
+	e.Info(fmt.Sprintf(msg, v...))
+}
+
+// Warnf level formatted message.
+func (e *Entry) Warnf(msg string, v ...interface{}) {
+	e.Warn(fmt.Sprintf(msg, v...))
+}
+
+// Errorf level formatted message.
+func (e *Entry) Errorf(msg string, v ...interface{}) {
+	e.Error(fmt.Sprintf(msg, v...))
+}
+
+// Fatalf level formatted message, followed by an exit.
+func (e *Entry) Fatalf(msg string, v ...interface{}) {
+	e.Fatal(fmt.Sprintf(msg, v...))
+}
+
+// Trace returns a new entry with a Stop method to fire off
+// a corresponding completion log, useful with defer.
+func (e *Entry) Trace(msg string) *Entry {
+	e.Info(msg)
+	v := e.WithFields(e.Fields)
+	v.Message = msg
+	v.start = time.Now()
+	return v
+}
+
+// Stop should be used with Trace, to fire off the completion message. When
+// an `err` is passed the "error" field is set, and the log level is error.
+func (e *Entry) Stop(err *error) {
+	if err == nil || *err == nil {
+		e.WithField("duration", time.Since(e.start)).Info(e.Message)
+	} else {
+		e.WithField("duration", time.Since(e.start)).WithError(*err).Error(e.Message)
+	}
+}
+
+// mergedFields returns the fields list collapsed into a single map.
+func (e *Entry) mergedFields() Fields {
+	f := Fields{}
+
+	for _, fields := range e.fields {
+		for k, v := range fields {
+			f[k] = v
+		}
+	}
+
+	return f
+}
+
+// finalize returns a copy of the Entry with Fields merged.
+func (e *Entry) finalize(level Level, msg string) *Entry {
+	return &Entry{
+		Logger:    e.Logger,
+		Fields:    e.mergedFields(),
+		Level:     level,
+		Message:   msg,
+		Timestamp: Now(),
+	}
+}

backend/vendor/github.com/apex/log/go.mod

@@ -0,0 +1,25 @@
+module github.com/apex/log
+
+go 1.12
+
+require (
+	github.com/aphistic/golf v0.0.0-20180712155816-02c07f170c5a
+	github.com/aphistic/sweet v0.2.0 // indirect
+	github.com/aws/aws-sdk-go v1.20.6
+	github.com/aybabtme/rgbterm v0.0.0-20170906152045-cc83f3b3ce59
+	github.com/fatih/color v1.7.0
+	github.com/go-logfmt/logfmt v0.4.0
+	github.com/google/uuid v1.1.1 // indirect
+	github.com/jpillora/backoff v0.0.0-20180909062703-3050d21c67d7 // indirect
+	github.com/mattn/go-colorable v0.1.2
+	github.com/pkg/errors v0.8.1
+	github.com/rogpeppe/fastuuid v1.1.0
+	github.com/smartystreets/go-aws-auth v0.0.0-20180515143844-0c1422d1fdb9 // indirect
+	github.com/smartystreets/gunit v1.0.0 // indirect
+	github.com/stretchr/testify v1.3.0
+	github.com/tj/assert v0.0.0-20171129193455-018094318fb0
+	github.com/tj/go-elastic v0.0.0-20171221160941-36157cbbebc2
+	github.com/tj/go-kinesis v0.0.0-20171128231115-08b17f58cb1b
+	github.com/tj/go-spin v1.1.0
+	golang.org/x/net v0.0.0-20190620200207-3b0461eec859 // indirect
+)

backend/vendor/github.com/apex/log/go.sum

@@ -0,0 +1,90 @@
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+golang.org/x/crypto v0.0.0-20190426145343-a29dc8fdc734 h1:p/H982KKEjUnLJkM3tt/LemDnOc1GiZL5FCVlORJ5zo=
+golang.org/x/crypto v0.0.0-20190426145343-a29dc8fdc734/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859 h1:R/3boaszxrf1GEUWTVDzSKVwLmSJpwZ1yqXm8j0v2QI=
+golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f h1:wMNYb4v58l5UBM7MYRLPG6ZhfOqbKu7X5eyFl8ZhKvA=
+golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223 h1:DH4skfRX4EBpamg7iV4ZlCpblAHI6s6TDM39bFZumv8=
+golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d h1:+R4KGOnez64A81RvjARKc4UT5/tI9ujCIVX+P5KiHuI=
+golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

backend/vendor/github.com/apex/log/interface.go

@@ -0,0 +1,19 @@
+package log
+
+// Interface represents the API of both Logger and Entry.
+type Interface interface {
+	WithFields(fields Fielder) *Entry
+	WithField(key string, value interface{}) *Entry
+	WithError(err error) *Entry
+	Debug(msg string)
+	Info(msg string)
+	Warn(msg string)
+	Error(msg string)
+	Fatal(msg string)
+	Debugf(msg string, v ...interface{})
+	Infof(msg string, v ...interface{})
+	Warnf(msg string, v ...interface{})
+	Errorf(msg string, v ...interface{})
+	Fatalf(msg string, v ...interface{})
+	Trace(msg string) *Entry
+}

backend/vendor/github.com/apex/log/levels.go

@@ -0,0 +1,81 @@
+package log
+
+import (
+	"bytes"
+	"errors"
+	"strings"
+)
+
+// ErrInvalidLevel is returned if the severity level is invalid.
+var ErrInvalidLevel = errors.New("invalid level")
+
+// Level of severity.
+type Level int
+
+// Log levels.
+const (
+	InvalidLevel Level = iota - 1
+	DebugLevel
+	InfoLevel
+	WarnLevel
+	ErrorLevel
+	FatalLevel
+)
+
+var levelNames = [...]string{
+	DebugLevel: "debug",
+	InfoLevel:  "info",
+	WarnLevel:  "warn",
+	ErrorLevel: "error",
+	FatalLevel: "fatal",
+}
+
+var levelStrings = map[string]Level{
+	"debug":   DebugLevel,
+	"info":    InfoLevel,
+	"warn":    WarnLevel,
+	"warning": WarnLevel,
+	"error":   ErrorLevel,
+	"fatal":   FatalLevel,
+}
+
+// String implementation.
+func (l Level) String() string {
+	return levelNames[l]
+}
+
+// MarshalJSON implementation.
+func (l Level) MarshalJSON() ([]byte, error) {
+	return []byte(`"` + l.String() + `"`), nil
+}
+
+// UnmarshalJSON implementation.
+func (l *Level) UnmarshalJSON(b []byte) error {
+	v, err := ParseLevel(string(bytes.Trim(b, `"`)))
+	if err != nil {
+		return err
+	}
+
+	*l = v
+	return nil
+}
+
+// ParseLevel parses level string.
+func ParseLevel(s string) (Level, error) {
+	l, ok := levelStrings[strings.ToLower(s)]
+	if !ok {
+		return InvalidLevel, ErrInvalidLevel
+	}
+
+	return l, nil
+}
+
+// MustParseLevel parses level string or panics.
+func MustParseLevel(s string) Level {
+	l, err := ParseLevel(s)
+	if err != nil {
+		panic("invalid log level")
+	}
+
+	return l
+}

backend/vendor/github.com/apex/log/logger.go

@@ -0,0 +1,149 @@
+package log
+
+import (
+	stdlog "log"
+	"sort"
+)
+
+// assert interface compliance.
+var _ Interface = (*Logger)(nil)
+
+// Fielder is an interface for providing fields to custom types.
+type Fielder interface {
+	Fields() Fields
+}
+
+// Fields represents a map of entry level data used for structured logging.
+type Fields map[string]interface{}
+
+// Fields implements Fielder.
+func (f Fields) Fields() Fields {
+	return f
+}
+
+// Get field value by name.
+func (f Fields) Get(name string) interface{} {
+	return f[name]
+}
+
+// Names returns field names sorted.
+func (f Fields) Names() (v []string) {
+	for k := range f {
+		v = append(v, k)
+	}
+
+	sort.Strings(v)
+	return
+}
+
+// The HandlerFunc type is an adapter to allow the use of ordinary functions as
+// log handlers. If f is a function with the appropriate signature,
+// HandlerFunc(f) is a Handler object that calls f.
+type HandlerFunc func(*Entry) error
+
+// HandleLog calls f(e).
+func (f HandlerFunc) HandleLog(e *Entry) error {
+	return f(e)
+}
+
+// Handler is used to handle log events, outputting them to
+// stdio or sending them to remote services. See the "handlers"
+// directory for implementations.
+//
+// It is left up to Handlers to implement thread-safety.
+type Handler interface {
+	HandleLog(*Entry) error
+}
+
+// Logger represents a logger with configurable Level and Handler.
+type Logger struct {
+	Handler Handler
+	Level   Level
+}
+
+// WithFields returns a new entry with `fields` set.
+func (l *Logger) WithFields(fields Fielder) *Entry {
+	return NewEntry(l).WithFields(fields.Fields())
+}
+
+// WithField returns a new entry with the `key` and `value` set.
+//
+// Note that the `key` should not have spaces in it - use camel
+// case or underscores
+func (l *Logger) WithField(key string, value interface{}) *Entry {
+	return NewEntry(l).WithField(key, value)
+}
+
+// WithError returns a new entry with the "error" set to `err`.
+func (l *Logger) WithError(err error) *Entry {
+	return NewEntry(l).WithError(err)
+}
+
+// Debug level message.
+func (l *Logger) Debug(msg string) {
+	NewEntry(l).Debug(msg)
+}
+
+// Info level message.
+func (l *Logger) Info(msg string) {
+	NewEntry(l).Info(msg)
+}
+
+// Warn level message.
+func (l *Logger) Warn(msg string) {
+	NewEntry(l).Warn(msg)
+}
+
+// Error level message.
+func (l *Logger) Error(msg string) {
+	NewEntry(l).Error(msg)
+}
+
+// Fatal level message, followed by an exit.
+func (l *Logger) Fatal(msg string) {
+	NewEntry(l).Fatal(msg)
+}
+
+// Debugf level formatted message.
+func (l *Logger) Debugf(msg string, v ...interface{}) {
+	NewEntry(l).Debugf(msg, v...)
+}
+
+// Infof level formatted message.
+func (l *Logger) Infof(msg string, v ...interface{}) {
+	NewEntry(l).Infof(msg, v...)
+}
+
+// Warnf level formatted message.
+func (l *Logger) Warnf(msg string, v ...interface{}) {
+	NewEntry(l).Warnf(msg, v...)
+}
+
+// Errorf level formatted message.
+func (l *Logger) Errorf(msg string, v ...interface{}) {
+	NewEntry(l).Errorf(msg, v...)
+}
+
+// Fatalf level formatted message, followed by an exit.
+func (l *Logger) Fatalf(msg string, v ...interface{}) {
+	NewEntry(l).Fatalf(msg, v...)
+}
+
+// Trace returns a new entry with a Stop method to fire off
+// a corresponding completion log, useful with defer.
+func (l *Logger) Trace(msg string) *Entry {
+	return NewEntry(l).Trace(msg)
+}
+
+// log the message, invoking the handler. We clone the entry here
+// to bypass the overhead in Entry methods when the level is not
+// met.
+func (l *Logger) log(level Level, e *Entry, msg string) {
+	if level < l.Level {
+		return
+	}
+
+	if err := l.Handler.HandleLog(e.finalize(level, msg)); err != nil {
+		stdlog.Printf("error logging: %s", err)
+	}
+}

backend/vendor/github.com/apex/log/pkg.go

@@ -0,0 +1,100 @@
+package log
+
+// singletons ftw?
+var Log Interface = &Logger{
+	Handler: HandlerFunc(handleStdLog),
+	Level:   InfoLevel,
+}
+
+// SetHandler sets the handler. This is not thread-safe.
+// The default handler outputs to the stdlib log.
+func SetHandler(h Handler) {
+	if logger, ok := Log.(*Logger); ok {
+		logger.Handler = h
+	}
+}
+
+// SetLevel sets the log level. This is not thread-safe.
+func SetLevel(l Level) {
+	if logger, ok := Log.(*Logger); ok {
+		logger.Level = l
+	}
+}
+
+// SetLevelFromString sets the log level from a string, panicing when invalid. This is not thread-safe.
+func SetLevelFromString(s string) {
+	if logger, ok := Log.(*Logger); ok {
+		logger.Level = MustParseLevel(s)
+	}
+}
+
+// WithFields returns a new entry with `fields` set.
+func WithFields(fields Fielder) *Entry {
+	return Log.WithFields(fields)
+}
+
+// WithField returns a new entry with the `key` and `value` set.
+func WithField(key string, value interface{}) *Entry {
+	return Log.WithField(key, value)
+}
+
+// WithError returns a new entry with the "error" set to `err`.
+func WithError(err error) *Entry {
+	return Log.WithError(err)
+}
+
+// Debug level message.
+func Debug(msg string) {
+	Log.Debug(msg)
+}
+
+// Info level message.
+func Info(msg string) {
+	Log.Info(msg)
+}
+
+// Warn level message.
+func Warn(msg string) {
+	Log.Warn(msg)
+}
+
+// Error level message.
+func Error(msg string) {
+	Log.Error(msg)
+}
+
+// Fatal level message, followed by an exit.
+func Fatal(msg string) {
+	Log.Fatal(msg)
+}
+
+// Debugf level formatted message.
+func Debugf(msg string, v ...interface{}) {
+	Log.Debugf(msg, v...)
+}
+
+// Infof level formatted message.
+func Infof(msg string, v ...interface{}) {
+	Log.Infof(msg, v...)
+}
+
+// Warnf level formatted message.
+func Warnf(msg string, v ...interface{}) {
+	Log.Warnf(msg, v...)
+}
+
+// Errorf level formatted message.
+func Errorf(msg string, v ...interface{}) {
+	Log.Errorf(msg, v...)
+}
+
+// Fatalf level formatted message, followed by an exit.
+func Fatalf(msg string, v ...interface{}) {
+	Log.Fatalf(msg, v...)
+}
+
+// Trace returns a new entry with a Stop method to fire off
+// a corresponding completion log, useful with defer.
+func Trace(msg string) *Entry {
+	return Log.Trace(msg)
+}

backend/vendor/github.com/apex/log/stack.go

@@ -0,0 +1,8 @@
+package log
+
+import "github.com/pkg/errors"
+
+// stackTracer interface.
+type stackTracer interface {
+	StackTrace() errors.StackTrace
+}

backend/vendor/github.com/fsnotify/fsnotify/.editorconfig

@@ -0,0 +1,5 @@
+root = true
+
+[*]
+indent_style = tab
+indent_size = 4

backend/vendor/github.com/fsnotify/fsnotify/.gitignore

@@ -0,0 +1,6 @@
+# Setup a Global .gitignore for OS and editor generated files:
+# https://help.github.com/articles/ignoring-files
+# git config --global core.excludesfile ~/.gitignore_global
+
+.vagrant
+*.sublime-project

backend/vendor/github.com/fsnotify/fsnotify/.travis.yml

@@ -0,0 +1,30 @@
+sudo: false
+language: go
+
+go:
+  - 1.8.x
+  - 1.9.x
+  - tip
+
+matrix:
+  allow_failures:
+    - go: tip
+  fast_finish: true
+
+before_script:
+  - go get -u github.com/golang/lint/golint
+
+script:
+  - go test -v --race ./...
+
+after_script:
+  - test -z "$(gofmt -s -l -w . | tee /dev/stderr)"
+  - test -z "$(golint ./...     | tee /dev/stderr)"
+  - go vet ./...
+
+os:
+  - linux
+  - osx
+
+notifications:
+  email: false

backend/vendor/github.com/fsnotify/fsnotify/AUTHORS

@@ -0,0 +1,52 @@
+# Names should be added to this file as
+#	Name or Organization <email address>
+# The email address is not required for organizations.
+
+# You can update this list using the following command:
+#
+#   $ git shortlog -se | awk '{print $2 " " $3 " " $4}'
+
+# Please keep the list sorted.
+
+Aaron L <aaron@bettercoder.net>
+Adrien Bustany <adrien@bustany.org>
+Amit Krishnan <amit.krishnan@oracle.com>
+Anmol Sethi <me@anmol.io>
+Bjørn Erik Pedersen <bjorn.erik.pedersen@gmail.com>
+Bruno Bigras <bigras.bruno@gmail.com>
+Caleb Spare <cespare@gmail.com>
+Case Nelson <case@teammating.com>
+Chris Howey <chris@howey.me> <howeyc@gmail.com>
+Christoffer Buchholz <christoffer.buchholz@gmail.com>
+Daniel Wagner-Hall <dawagner@gmail.com>
+Dave Cheney <dave@cheney.net>
+Evan Phoenix <evan@fallingsnow.net>
+Francisco Souza <f@souza.cc>
+Hari haran <hariharan.uno@gmail.com>
+John C Barstow
+Kelvin Fo <vmirage@gmail.com>
+Ken-ichirou MATSUZAWA <chamas@h4.dion.ne.jp>
+Matt Layher <mdlayher@gmail.com>
+Nathan Youngman <git@nathany.com>
+Nickolai Zeldovich <nickolai@csail.mit.edu>
+Patrick <patrick@dropbox.com>
+Paul Hammond <paul@paulhammond.org>
+Pawel Knap <pawelknap88@gmail.com>
+Pieter Droogendijk <pieter@binky.org.uk>
+Pursuit92 <JoshChase@techpursuit.net>
+Riku Voipio <riku.voipio@linaro.org>
+Rob Figueiredo <robfig@gmail.com>
+Rodrigo Chiossi <rodrigochiossi@gmail.com>
+Slawek Ligus <root@ooz.ie>
+Soge Zhang <zhssoge@gmail.com>
+Tiffany Jernigan <tiffany.jernigan@intel.com>
+Tilak Sharma <tilaks@google.com>
+Tom Payne <twpayne@gmail.com>
+Travis Cline <travis.cline@gmail.com>
+Tudor Golubenco <tudor.g@gmail.com>
+Vahe Khachikyan <vahe@live.ca>
+Yukang <moorekang@gmail.com>
+bronze1man <bronze1man@gmail.com>
+debrando <denis.brandolini@gmail.com>
+henrikedwards <henrik.edwards@gmail.com>
+铁哥 <guotie.9@gmail.com>

backend/vendor/github.com/fsnotify/fsnotify/CHANGELOG.md

@@ -0,0 +1,317 @@
+# Changelog
+
+## v1.4.7 / 2018-01-09
+
+* BSD/macOS: Fix possible deadlock on closing the watcher on kqueue (thanks @nhooyr and @glycerine)
+* Tests: Fix missing verb on format string (thanks @rchiossi)
+* Linux: Fix deadlock in Remove (thanks @aarondl)
+* Linux: Watch.Add improvements (avoid race, fix consistency, reduce garbage) (thanks @twpayne)
+* Docs: Moved FAQ into the README (thanks @vahe)
+* Linux: Properly handle inotify's IN_Q_OVERFLOW event (thanks @zeldovich)
+* Docs: replace references to OS X with macOS
+
+## v1.4.2 / 2016-10-10
+
+* Linux: use InotifyInit1 with IN_CLOEXEC to stop leaking a file descriptor to a child process when using fork/exec [#178](https://github.com/fsnotify/fsnotify/pull/178) (thanks @pattyshack)
+
+## v1.4.1 / 2016-10-04
+
+* Fix flaky inotify stress test on Linux [#177](https://github.com/fsnotify/fsnotify/pull/177) (thanks @pattyshack)
+
+## v1.4.0 / 2016-10-01
+
+* add a String() method to Event.Op [#165](https://github.com/fsnotify/fsnotify/pull/165) (thanks @oozie)
+
+## v1.3.1 / 2016-06-28
+
+* Windows: fix for double backslash when watching the root of a drive [#151](https://github.com/fsnotify/fsnotify/issues/151) (thanks @brunoqc)
+
+## v1.3.0 / 2016-04-19
+
+* Support linux/arm64 by [patching](https://go-review.googlesource.com/#/c/21971/) x/sys/unix and switching to to it from syscall (thanks @suihkulokki) [#135](https://github.com/fsnotify/fsnotify/pull/135)
+
+## v1.2.10 / 2016-03-02
+
+* Fix golint errors in windows.go [#121](https://github.com/fsnotify/fsnotify/pull/121) (thanks @tiffanyfj)
+
+## v1.2.9 / 2016-01-13
+
+kqueue: Fix logic for CREATE after REMOVE [#111](https://github.com/fsnotify/fsnotify/pull/111) (thanks @bep)
+
+## v1.2.8 / 2015-12-17
+
+* kqueue: fix race condition in Close [#105](https://github.com/fsnotify/fsnotify/pull/105) (thanks @djui for reporting the issue and @ppknap for writing a failing test)
+* inotify: fix race in test
+* enable race detection for continuous integration (Linux, Mac, Windows)
+
+## v1.2.5 / 2015-10-17
+
+* inotify: use epoll_create1 for arm64 support (requires Linux 2.6.27 or later) [#100](https://github.com/fsnotify/fsnotify/pull/100) (thanks @suihkulokki)
+* inotify: fix path leaks [#73](https://github.com/fsnotify/fsnotify/pull/73) (thanks @chamaken)
+* kqueue: watch for rename events on subdirectories [#83](https://github.com/fsnotify/fsnotify/pull/83) (thanks @guotie)
+* kqueue: avoid infinite loops from symlinks cycles [#101](https://github.com/fsnotify/fsnotify/pull/101) (thanks @illicitonion)
+
+## v1.2.1 / 2015-10-14
+
+* kqueue: don't watch named pipes [#98](https://github.com/fsnotify/fsnotify/pull/98) (thanks @evanphx)
+
+## v1.2.0 / 2015-02-08
+
+* inotify: use epoll to wake up readEvents [#66](https://github.com/fsnotify/fsnotify/pull/66) (thanks @PieterD)
+* inotify: closing watcher should now always shut down goroutine [#63](https://github.com/fsnotify/fsnotify/pull/63) (thanks @PieterD)
+* kqueue: close kqueue after removing watches, fixes [#59](https://github.com/fsnotify/fsnotify/issues/59)
+
+## v1.1.1 / 2015-02-05
+
+* inotify: Retry read on EINTR [#61](https://github.com/fsnotify/fsnotify/issues/61) (thanks @PieterD)
+
+## v1.1.0 / 2014-12-12
+
+* kqueue: rework internals [#43](https://github.com/fsnotify/fsnotify/pull/43)
+    * add low-level functions
+    * only need to store flags on directories
+    * less mutexes [#13](https://github.com/fsnotify/fsnotify/issues/13)
+    * done can be an unbuffered channel
+    * remove calls to os.NewSyscallError
+* More efficient string concatenation for Event.String() [#52](https://github.com/fsnotify/fsnotify/pull/52) (thanks @mdlayher)
+* kqueue: fix regression in  rework causing subdirectories to be watched [#48](https://github.com/fsnotify/fsnotify/issues/48)
+* kqueue: cleanup internal watch before sending remove event [#51](https://github.com/fsnotify/fsnotify/issues/51)
+
+## v1.0.4 / 2014-09-07
+
+* kqueue: add dragonfly to the build tags.
+* Rename source code files, rearrange code so exported APIs are at the top.
+* Add done channel to example code. [#37](https://github.com/fsnotify/fsnotify/pull/37) (thanks @chenyukang)
+
+## v1.0.3 / 2014-08-19
+
+* [Fix] Windows MOVED_TO now translates to Create like on BSD and Linux. [#36](https://github.com/fsnotify/fsnotify/issues/36)
+
+## v1.0.2 / 2014-08-17
+
+* [Fix] Missing create events on macOS. [#14](https://github.com/fsnotify/fsnotify/issues/14) (thanks @zhsso)
+* [Fix] Make ./path and path equivalent. (thanks @zhsso)
+
+## v1.0.0 / 2014-08-15
+
+* [API] Remove AddWatch on Windows, use Add.
+* Improve documentation for exported identifiers. [#30](https://github.com/fsnotify/fsnotify/issues/30)
+* Minor updates based on feedback from golint.
+
+## dev / 2014-07-09
+
+* Moved to [github.com/fsnotify/fsnotify](https://github.com/fsnotify/fsnotify).
+* Use os.NewSyscallError instead of returning errno (thanks @hariharan-uno)
+
+## dev / 2014-07-04
+
+* kqueue: fix incorrect mutex used in Close()
+* Update example to demonstrate usage of Op.
+
+## dev / 2014-06-28
+
+* [API] Don't set the Write Op for attribute notifications [#4](https://github.com/fsnotify/fsnotify/issues/4)
+* Fix for String() method on Event (thanks Alex Brainman)
+* Don't build on Plan 9 or Solaris (thanks @4ad)
+
+## dev / 2014-06-21
+
+* Events channel of type Event rather than *Event.
+* [internal] use syscall constants directly for inotify and kqueue.
+* [internal] kqueue: rename events to kevents and fileEvent to event.
+
+## dev / 2014-06-19
+
+* Go 1.3+ required on Windows (uses syscall.ERROR_MORE_DATA internally).
+* [internal] remove cookie from Event struct (unused).
+* [internal] Event struct has the same definition across every OS.
+* [internal] remove internal watch and removeWatch methods.
+
+## dev / 2014-06-12
+
+* [API] Renamed Watch() to Add() and RemoveWatch() to Remove().
+* [API] Pluralized channel names: Events and Errors.
+* [API] Renamed FileEvent struct to Event.
+* [API] Op constants replace methods like IsCreate().
+
+## dev / 2014-06-12
+
+* Fix data race on kevent buffer (thanks @tilaks) [#98](https://github.com/howeyc/fsnotify/pull/98)
+
+## dev / 2014-05-23
+
+* [API] Remove current implementation of WatchFlags.
+    * current implementation doesn't take advantage of OS for efficiency
+    * provides little benefit over filtering events as they are received, but has  extra bookkeeping and mutexes
+    * no tests for the current implementation
+    * not fully implemented on Windows [#93](https://github.com/howeyc/fsnotify/issues/93#issuecomment-39285195)
+
+## v0.9.3 / 2014-12-31
+
+* kqueue: cleanup internal watch before sending remove event [#51](https://github.com/fsnotify/fsnotify/issues/51)
+
+## v0.9.2 / 2014-08-17
+
+* [Backport] Fix missing create events on macOS. [#14](https://github.com/fsnotify/fsnotify/issues/14) (thanks @zhsso)
+
+## v0.9.1 / 2014-06-12
+
+* Fix data race on kevent buffer (thanks @tilaks) [#98](https://github.com/howeyc/fsnotify/pull/98)
+
+## v0.9.0 / 2014-01-17
+
+* IsAttrib() for events that only concern a file's metadata [#79][] (thanks @abustany)
+* [Fix] kqueue: fix deadlock [#77][] (thanks @cespare)
+* [NOTICE] Development has moved to `code.google.com/p/go.exp/fsnotify` in preparation for inclusion in the Go standard library.
+
+## v0.8.12 / 2013-11-13
+
+* [API] Remove FD_SET and friends from Linux adapter
+
+## v0.8.11 / 2013-11-02
+
+* [Doc] Add Changelog [#72][] (thanks @nathany)
+* [Doc] Spotlight and double modify events on macOS [#62][] (reported by @paulhammond)
+
+## v0.8.10 / 2013-10-19
+
+* [Fix] kqueue: remove file watches when parent directory is removed [#71][] (reported by @mdwhatcott)
+* [Fix] kqueue: race between Close and readEvents [#70][] (reported by @bernerdschaefer)
+* [Doc] specify OS-specific limits in README (thanks @debrando)
+
+## v0.8.9 / 2013-09-08
+
+* [Doc] Contributing (thanks @nathany)
+* [Doc] update package path in example code [#63][] (thanks @paulhammond)
+* [Doc] GoCI badge in README (Linux only) [#60][]
+* [Doc] Cross-platform testing with Vagrant  [#59][] (thanks @nathany)
+
+## v0.8.8 / 2013-06-17
+
+* [Fix] Windows: handle `ERROR_MORE_DATA` on Windows [#49][] (thanks @jbowtie)
+
+## v0.8.7 / 2013-06-03
+
+* [API] Make syscall flags internal
+* [Fix] inotify: ignore event changes
+* [Fix] race in symlink test [#45][] (reported by @srid)
+* [Fix] tests on Windows
+* lower case error messages
+
+## v0.8.6 / 2013-05-23
+
+* kqueue: Use EVT_ONLY flag on Darwin
+* [Doc] Update README with full example
+
+## v0.8.5 / 2013-05-09
+
+* [Fix] inotify: allow monitoring of "broken" symlinks (thanks @tsg)
+
+## v0.8.4 / 2013-04-07
+
+* [Fix] kqueue: watch all file events [#40][] (thanks @ChrisBuchholz)
+
+## v0.8.3 / 2013-03-13
+
+* [Fix] inoitfy/kqueue memory leak [#36][] (reported by @nbkolchin)
+* [Fix] kqueue: use fsnFlags for watching a directory [#33][] (reported by @nbkolchin)
+
+## v0.8.2 / 2013-02-07
+
+* [Doc] add Authors
+* [Fix] fix data races for map access [#29][] (thanks @fsouza)
+
+## v0.8.1 / 2013-01-09
+
+* [Fix] Windows path separators
+* [Doc] BSD License
+
+## v0.8.0 / 2012-11-09
+
+* kqueue: directory watching improvements (thanks @vmirage)
+* inotify: add `IN_MOVED_TO` [#25][] (requested by @cpisto)
+* [Fix] kqueue: deleting watched directory [#24][] (reported by @jakerr)
+
+## v0.7.4 / 2012-10-09
+
+* [Fix] inotify: fixes from https://codereview.appspot.com/5418045/ (ugorji)
+* [Fix] kqueue: preserve watch flags when watching for delete [#21][] (reported by @robfig)
+* [Fix] kqueue: watch the directory even if it isn't a new watch (thanks @robfig)
+* [Fix] kqueue: modify after recreation of file
+
+## v0.7.3 / 2012-09-27
+
+* [Fix] kqueue: watch with an existing folder inside the watched folder (thanks @vmirage)
+* [Fix] kqueue: no longer get duplicate CREATE events
+
+## v0.7.2 / 2012-09-01
+
+* kqueue: events for created directories
+
+## v0.7.1 / 2012-07-14
+
+* [Fix] for renaming files
+
+## v0.7.0 / 2012-07-02
+
+* [Feature] FSNotify flags
+* [Fix] inotify: Added file name back to event path
+
+## v0.6.0 / 2012-06-06
+
+* kqueue: watch files after directory created (thanks @tmc)
+
+## v0.5.1 / 2012-05-22
+
+* [Fix] inotify: remove all watches before Close()
+
+## v0.5.0 / 2012-05-03
+
+* [API] kqueue: return errors during watch instead of sending over channel
+* kqueue: match symlink behavior on Linux
+* inotify: add `DELETE_SELF` (requested by @taralx)
+* [Fix] kqueue: handle EINTR (reported by @robfig)
+* [Doc] Godoc example [#1][] (thanks @davecheney)
+
+## v0.4.0 / 2012-03-30
+
+* Go 1 released: build with go tool
+* [Feature] Windows support using winfsnotify
+* Windows does not have attribute change notifications
+* Roll attribute notifications into IsModify
+
+## v0.3.0 / 2012-02-19
+
+* kqueue: add files when watch directory
+
+## v0.2.0 / 2011-12-30
+
+* update to latest Go weekly code
+
+## v0.1.0 / 2011-10-19
+
+* kqueue: add watch on file creation to match inotify
+* kqueue: create file event
+* inotify: ignore `IN_IGNORED` events
+* event String()
+* linux: common FileEvent functions
+* initial commit
+
+[#79]: https://github.com/howeyc/fsnotify/pull/79
+[#77]: https://github.com/howeyc/fsnotify/pull/77
+[#72]: https://github.com/howeyc/fsnotify/issues/72
+[#71]: https://github.com/howeyc/fsnotify/issues/71
+[#70]: https://github.com/howeyc/fsnotify/issues/70
+[#63]: https://github.com/howeyc/fsnotify/issues/63
+[#62]: https://github.com/howeyc/fsnotify/issues/62
+[#60]: https://github.com/howeyc/fsnotify/issues/60
+[#59]: https://github.com/howeyc/fsnotify/issues/59
+[#49]: https://github.com/howeyc/fsnotify/issues/49
+[#45]: https://github.com/howeyc/fsnotify/issues/45
+[#40]: https://github.com/howeyc/fsnotify/issues/40
+[#36]: https://github.com/howeyc/fsnotify/issues/36
+[#33]: https://github.com/howeyc/fsnotify/issues/33
+[#29]: https://github.com/howeyc/fsnotify/issues/29
+[#25]: https://github.com/howeyc/fsnotify/issues/25
+[#24]: https://github.com/howeyc/fsnotify/issues/24
+[#21]: https://github.com/howeyc/fsnotify/issues/21

backend/vendor/github.com/fsnotify/fsnotify/CONTRIBUTING.md

@@ -0,0 +1,77 @@
+# Contributing
+
+## Issues
+
+* Request features and report bugs using the [GitHub Issue Tracker](https://github.com/fsnotify/fsnotify/issues).
+* Please indicate the platform you are using fsnotify on.
+* A code example to reproduce the problem is appreciated.
+
+## Pull Requests
+
+### Contributor License Agreement
+
+fsnotify is derived from code in the [golang.org/x/exp](https://godoc.org/golang.org/x/exp) package and it may be included [in the standard library](https://github.com/fsnotify/fsnotify/issues/1) in the future. Therefore fsnotify carries the same [LICENSE](https://github.com/fsnotify/fsnotify/blob/master/LICENSE) as Go. Contributors retain their copyright, so you need to fill out a short form before we can accept your contribution: [Google Individual Contributor License Agreement](https://developers.google.com/open-source/cla/individual).
+
+Please indicate that you have signed the CLA in your pull request.
+
+### How fsnotify is Developed
+
+* Development is done on feature branches.
+* Tests are run on BSD, Linux, macOS and Windows.
+* Pull requests are reviewed and [applied to master][am] using [hub][].
+  * Maintainers may modify or squash commits rather than asking contributors to.
+* To issue a new release, the maintainers will:
+  * Update the CHANGELOG
+  * Tag a version, which will become available through gopkg.in.
+ 
+### How to Fork
+
+For smooth sailing, always use the original import path. Installing with `go get` makes this easy. 
+
+1. Install from GitHub (`go get -u github.com/fsnotify/fsnotify`)
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Ensure everything works and the tests pass (see below)
+4. Commit your changes (`git commit -am 'Add some feature'`)
+
+Contribute upstream:
+
+1. Fork fsnotify on GitHub
+2. Add your remote (`git remote add fork git@github.com:mycompany/repo.git`)
+3. Push to the branch (`git push fork my-new-feature`)
+4. Create a new Pull Request on GitHub
+
+This workflow is [thoroughly explained by Katrina Owen](https://splice.com/blog/contributing-open-source-git-repositories-go/).
+
+### Testing
+
+fsnotify uses build tags to compile different code on Linux, BSD, macOS, and Windows.
+
+Before doing a pull request, please do your best to test your changes on multiple platforms, and list which platforms you were able/unable to test on.
+
+To aid in cross-platform testing there is a Vagrantfile for Linux and BSD.
+
+* Install [Vagrant](http://www.vagrantup.com/) and [VirtualBox](https://www.virtualbox.org/)
+* Setup [Vagrant Gopher](https://github.com/nathany/vagrant-gopher) in your `src` folder.
+* Run `vagrant up` from the project folder. You can also setup just one box with `vagrant up linux` or `vagrant up bsd` (note: the BSD box doesn't support Windows hosts at this time, and NFS may prompt for your host OS password)
+* Once setup, you can run the test suite on a given OS with a single command `vagrant ssh linux -c 'cd fsnotify/fsnotify; go test'`.
+* When you're done, you will want to halt or destroy the Vagrant boxes.
+
+Notice: fsnotify file system events won't trigger in shared folders. The tests get around this limitation by using the /tmp directory.
+
+Right now there is no equivalent solution for Windows and macOS, but there are Windows VMs [freely available from Microsoft](http://www.modern.ie/en-us/virtualization-tools#downloads).
+
+### Maintainers
+
+Help maintaining fsnotify is welcome. To be a maintainer:
+
+* Submit a pull request and sign the CLA as above.
+* You must be able to run the test suite on Mac, Windows, Linux and BSD.
+
+To keep master clean, the fsnotify project uses the "apply mail" workflow outlined in Nathaniel Talbott's post ["Merge pull request" Considered Harmful][am]. This requires installing [hub][].
+
+All code changes should be internal pull requests.
+
+Releases are tagged using [Semantic Versioning](http://semver.org/).
+
+[hub]: https://github.com/github/hub
+[am]: http://blog.spreedly.com/2014/06/24/merge-pull-request-considered-harmful/#.VGa5yZPF_Zs

backend/vendor/github.com/fsnotify/fsnotify/LICENSE

@@ -0,0 +1,28 @@
+Copyright (c) 2012 The Go Authors. All rights reserved.
+Copyright (c) 2012 fsnotify Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

backend/vendor/github.com/fsnotify/fsnotify/README.md

@@ -0,0 +1,79 @@
+# File system notifications for Go
+
+[![GoDoc](https://godoc.org/github.com/fsnotify/fsnotify?status.svg)](https://godoc.org/github.com/fsnotify/fsnotify) [![Go Report Card](https://goreportcard.com/badge/github.com/fsnotify/fsnotify)](https://goreportcard.com/report/github.com/fsnotify/fsnotify)
+
+fsnotify utilizes [golang.org/x/sys](https://godoc.org/golang.org/x/sys) rather than `syscall` from the standard library. Ensure you have the latest version installed by running:
+
+```console
+go get -u golang.org/x/sys/...
+```
+
+Cross platform: Windows, Linux, BSD and macOS.
+
+|Adapter   |OS        |Status    |
+|----------|----------|----------|
+|inotify   |Linux 2.6.27 or later, Android\*|Supported [![Build Status](https://travis-ci.org/fsnotify/fsnotify.svg?branch=master)](https://travis-ci.org/fsnotify/fsnotify)|
+|kqueue    |BSD, macOS, iOS\*|Supported [![Build Status](https://travis-ci.org/fsnotify/fsnotify.svg?branch=master)](https://travis-ci.org/fsnotify/fsnotify)|
+|ReadDirectoryChangesW|Windows|Supported [![Build status](https://ci.appveyor.com/api/projects/status/ivwjubaih4r0udeh/branch/master?svg=true)](https://ci.appveyor.com/project/NathanYoungman/fsnotify/branch/master)|
+|FSEvents  |macOS         |[Planned](https://github.com/fsnotify/fsnotify/issues/11)|
+|FEN       |Solaris 11    |[In Progress](https://github.com/fsnotify/fsnotify/issues/12)|
+|fanotify  |Linux 2.6.37+ | |
+|USN Journals |Windows    |[Maybe](https://github.com/fsnotify/fsnotify/issues/53)|
+|Polling   |*All*         |[Maybe](https://github.com/fsnotify/fsnotify/issues/9)|
+
+\* Android and iOS are untested.
+
+Please see [the documentation](https://godoc.org/github.com/fsnotify/fsnotify) and consult the [FAQ](#faq) for usage information.
+
+## API stability
+
+fsnotify is a fork of [howeyc/fsnotify](https://godoc.org/github.com/howeyc/fsnotify) with a new API as of v1.0. The API is based on [this design document](http://goo.gl/MrYxyA). 
+
+All [releases](https://github.com/fsnotify/fsnotify/releases) are tagged based on [Semantic Versioning](http://semver.org/). Further API changes are [planned](https://github.com/fsnotify/fsnotify/milestones), and will be tagged with a new major revision number.
+
+Go 1.6 supports dependencies located in the `vendor/` folder. Unless you are creating a library, it is recommended that you copy fsnotify into `vendor/github.com/fsnotify/fsnotify` within your project, and likewise for `golang.org/x/sys`.
+
+## Contributing
+
+Please refer to [CONTRIBUTING][] before opening an issue or pull request.
+
+## Example
+
+See [example_test.go](https://github.com/fsnotify/fsnotify/blob/master/example_test.go).
+
+## FAQ
+
+**When a file is moved to another directory is it still being watched?**
+
+No (it shouldn't be, unless you are watching where it was moved to).
+
+**When I watch a directory, are all subdirectories watched as well?**
+
+No, you must add watches for any directory you want to watch (a recursive watcher is on the roadmap [#18][]).
+
+**Do I have to watch the Error and Event channels in a separate goroutine?**
+
+As of now, yes. Looking into making this single-thread friendly (see [howeyc #7][#7])
+
+**Why am I receiving multiple events for the same file on OS X?**
+
+Spotlight indexing on OS X can result in multiple events (see [howeyc #62][#62]). A temporary workaround is to add your folder(s) to the *Spotlight Privacy settings* until we have a native FSEvents implementation (see [#11][]).
+
+**How many files can be watched at once?**
+
+There are OS-specific limits as to how many watches can be created:
+* Linux: /proc/sys/fs/inotify/max_user_watches contains the limit, reaching this limit results in a "no space left on device" error.
+* BSD / OSX: sysctl variables "kern.maxfiles" and "kern.maxfilesperproc", reaching these limits results in a "too many open files" error.
+
+[#62]: https://github.com/howeyc/fsnotify/issues/62
+[#18]: https://github.com/fsnotify/fsnotify/issues/18
+[#11]: https://github.com/fsnotify/fsnotify/issues/11
+[#7]: https://github.com/howeyc/fsnotify/issues/7
+
+[contributing]: https://github.com/fsnotify/fsnotify/blob/master/CONTRIBUTING.md
+
+## Related Projects
+
+* [notify](https://github.com/rjeczalik/notify)
+* [fsevents](https://github.com/fsnotify/fsevents)
+

backend/vendor/github.com/fsnotify/fsnotify/fen.go

@@ -0,0 +1,37 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build solaris
+
+package fsnotify
+
+import (
+	"errors"
+)
+
+// Watcher watches a set of files, delivering events to a channel.
+type Watcher struct {
+	Events chan Event
+	Errors chan error
+}
+
+// NewWatcher establishes a new watcher with the underlying OS and begins waiting for events.
+func NewWatcher() (*Watcher, error) {
+	return nil, errors.New("FEN based watcher not yet supported for fsnotify\n")
+}
+
+// Close removes all watches and closes the events channel.
+func (w *Watcher) Close() error {
+	return nil
+}
+
+// Add starts watching the named file or directory (non-recursively).
+func (w *Watcher) Add(name string) error {
+	return nil
+}
+
+// Remove stops watching the the named file or directory (non-recursively).
+func (w *Watcher) Remove(name string) error {
+	return nil
+}

backend/vendor/github.com/fsnotify/fsnotify/fsnotify.go

@@ -0,0 +1,66 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !plan9
+
+// Package fsnotify provides a platform-independent interface for file system notifications.
+package fsnotify
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+)
+
+// Event represents a single file system notification.
+type Event struct {
+	Name string // Relative path to the file or directory.
+	Op   Op     // File operation that triggered the event.
+}
+
+// Op describes a set of file operations.
+type Op uint32
+
+// These are the generalized file operations that can trigger a notification.
+const (
+	Create Op = 1 << iota
+	Write
+	Remove
+	Rename
+	Chmod
+)
+
+func (op Op) String() string {
+	// Use a buffer for efficient string concatenation
+	var buffer bytes.Buffer
+
+	if op&Create == Create {
+		buffer.WriteString("|CREATE")
+	}
+	if op&Remove == Remove {
+		buffer.WriteString("|REMOVE")
+	}
+	if op&Write == Write {
+		buffer.WriteString("|WRITE")
+	}
+	if op&Rename == Rename {
+		buffer.WriteString("|RENAME")
+	}
+	if op&Chmod == Chmod {
+		buffer.WriteString("|CHMOD")
+	}
+	if buffer.Len() == 0 {
+		return ""
+	}
+	return buffer.String()[1:] // Strip leading pipe
+}
+
+// String returns a string representation of the event in the form
+// "file: REMOVE|WRITE|..."
+func (e Event) String() string {
+	return fmt.Sprintf("%q: %s", e.Name, e.Op.String())
+}
+
+// Common errors that can be reported by a watcher
+var ErrEventOverflow = errors.New("fsnotify queue overflow")

backend/vendor/github.com/fsnotify/fsnotify/inotify.go

@@ -0,0 +1,337 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build linux
+
+package fsnotify
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+)
+
+// Watcher watches a set of files, delivering events to a channel.
+type Watcher struct {
+	Events   chan Event
+	Errors   chan error
+	mu       sync.Mutex // Map access
+	fd       int
+	poller   *fdPoller
+	watches  map[string]*watch // Map of inotify watches (key: path)
+	paths    map[int]string    // Map of watched paths (key: watch descriptor)
+	done     chan struct{}     // Channel for sending a "quit message" to the reader goroutine
+	doneResp chan struct{}     // Channel to respond to Close
+}
+
+// NewWatcher establishes a new watcher with the underlying OS and begins waiting for events.
+func NewWatcher() (*Watcher, error) {
+	// Create inotify fd
+	fd, errno := unix.InotifyInit1(unix.IN_CLOEXEC)
+	if fd == -1 {
+		return nil, errno
+	}
+	// Create epoll
+	poller, err := newFdPoller(fd)
+	if err != nil {
+		unix.Close(fd)
+		return nil, err
+	}
+	w := &Watcher{
+		fd:       fd,
+		poller:   poller,
+		watches:  make(map[string]*watch),
+		paths:    make(map[int]string),
+		Events:   make(chan Event),
+		Errors:   make(chan error),
+		done:     make(chan struct{}),
+		doneResp: make(chan struct{}),
+	}
+
+	go w.readEvents()
+	return w, nil
+}
+
+func (w *Watcher) isClosed() bool {
+	select {
+	case <-w.done:
+		return true
+	default:
+		return false
+	}
+}
+
+// Close removes all watches and closes the events channel.
+func (w *Watcher) Close() error {
+	if w.isClosed() {
+		return nil
+	}
+
+	// Send 'close' signal to goroutine, and set the Watcher to closed.
+	close(w.done)
+
+	// Wake up goroutine
+	w.poller.wake()
+
+	// Wait for goroutine to close
+	<-w.doneResp
+
+	return nil
+}
+
+// Add starts watching the named file or directory (non-recursively).
+func (w *Watcher) Add(name string) error {
+	name = filepath.Clean(name)
+	if w.isClosed() {
+		return errors.New("inotify instance already closed")
+	}
+
+	const agnosticEvents = unix.IN_MOVED_TO | unix.IN_MOVED_FROM |
+		unix.IN_CREATE | unix.IN_ATTRIB | unix.IN_MODIFY |
+		unix.IN_MOVE_SELF | unix.IN_DELETE | unix.IN_DELETE_SELF
+
+	var flags uint32 = agnosticEvents
+
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	watchEntry := w.watches[name]
+	if watchEntry != nil {
+		flags |= watchEntry.flags | unix.IN_MASK_ADD
+	}
+	wd, errno := unix.InotifyAddWatch(w.fd, name, flags)
+	if wd == -1 {
+		return errno
+	}
+
+	if watchEntry == nil {
+		w.watches[name] = &watch{wd: uint32(wd), flags: flags}
+		w.paths[wd] = name
+	} else {
+		watchEntry.wd = uint32(wd)
+		watchEntry.flags = flags
+	}
+
+	return nil
+}
+
+// Remove stops watching the named file or directory (non-recursively).
+func (w *Watcher) Remove(name string) error {
+	name = filepath.Clean(name)
+
+	// Fetch the watch.
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	watch, ok := w.watches[name]
+
+	// Remove it from inotify.
+	if !ok {
+		return fmt.Errorf("can't remove non-existent inotify watch for: %s", name)
+	}
+
+	// We successfully removed the watch if InotifyRmWatch doesn't return an
+	// error, we need to clean up our internal state to ensure it matches
+	// inotify's kernel state.
+	delete(w.paths, int(watch.wd))
+	delete(w.watches, name)
+
+	// inotify_rm_watch will return EINVAL if the file has been deleted;
+	// the inotify will already have been removed.
+	// watches and pathes are deleted in ignoreLinux() implicitly and asynchronously
+	// by calling inotify_rm_watch() below. e.g. readEvents() goroutine receives IN_IGNORE
+	// so that EINVAL means that the wd is being rm_watch()ed or its file removed
+	// by another thread and we have not received IN_IGNORE event.
+	success, errno := unix.InotifyRmWatch(w.fd, watch.wd)
+	if success == -1 {
+		// TODO: Perhaps it's not helpful to return an error here in every case.
+		// the only two possible errors are:
+		// EBADF, which happens when w.fd is not a valid file descriptor of any kind.
+		// EINVAL, which is when fd is not an inotify descriptor or wd is not a valid watch descriptor.
+		// Watch descriptors are invalidated when they are removed explicitly or implicitly;
+		// explicitly by inotify_rm_watch, implicitly when the file they are watching is deleted.
+		return errno
+	}
+
+	return nil
+}
+
+type watch struct {
+	wd    uint32 // Watch descriptor (as returned by the inotify_add_watch() syscall)
+	flags uint32 // inotify flags of this watch (see inotify(7) for the list of valid flags)
+}
+
+// readEvents reads from the inotify file descriptor, converts the
+// received events into Event objects and sends them via the Events channel
+func (w *Watcher) readEvents() {
+	var (
+		buf   [unix.SizeofInotifyEvent * 4096]byte // Buffer for a maximum of 4096 raw events
+		n     int                                  // Number of bytes read with read()
+		errno error                                // Syscall errno
+		ok    bool                                 // For poller.wait
+	)
+
+	defer close(w.doneResp)
+	defer close(w.Errors)
+	defer close(w.Events)
+	defer unix.Close(w.fd)
+	defer w.poller.close()
+
+	for {
+		// See if we have been closed.
+		if w.isClosed() {
+			return
+		}
+
+		ok, errno = w.poller.wait()
+		if errno != nil {
+			select {
+			case w.Errors <- errno:
+			case <-w.done:
+				return
+			}
+			continue
+		}
+
+		if !ok {
+			continue
+		}
+
+		n, errno = unix.Read(w.fd, buf[:])
+		// If a signal interrupted execution, see if we've been asked to close, and try again.
+		// http://man7.org/linux/man-pages/man7/signal.7.html :
+		// "Before Linux 3.8, reads from an inotify(7) file descriptor were not restartable"
+		if errno == unix.EINTR {
+			continue
+		}
+
+		// unix.Read might have been woken up by Close. If so, we're done.
+		if w.isClosed() {
+			return
+		}
+
+		if n < unix.SizeofInotifyEvent {
+			var err error
+			if n == 0 {
+				// If EOF is received. This should really never happen.
+				err = io.EOF
+			} else if n < 0 {
+				// If an error occurred while reading.
+				err = errno
+			} else {
+				// Read was too short.
+				err = errors.New("notify: short read in readEvents()")
+			}
+			select {
+			case w.Errors <- err:
+			case <-w.done:
+				return
+			}
+			continue
+		}
+
+		var offset uint32
+		// We don't know how many events we just read into the buffer
+		// While the offset points to at least one whole event...
+		for offset <= uint32(n-unix.SizeofInotifyEvent) {
+			// Point "raw" to the event in the buffer
+			raw := (*unix.InotifyEvent)(unsafe.Pointer(&buf[offset]))
+
+			mask := uint32(raw.Mask)
+			nameLen := uint32(raw.Len)
+
+			if mask&unix.IN_Q_OVERFLOW != 0 {
+				select {
+				case w.Errors <- ErrEventOverflow:
+				case <-w.done:
+					return
+				}
+			}
+
+			// If the event happened to the watched directory or the watched file, the kernel
+			// doesn't append the filename to the event, but we would like to always fill the
+			// the "Name" field with a valid filename. We retrieve the path of the watch from
+			// the "paths" map.
+			w.mu.Lock()
+			name, ok := w.paths[int(raw.Wd)]
+			// IN_DELETE_SELF occurs when the file/directory being watched is removed.
+			// This is a sign to clean up the maps, otherwise we are no longer in sync
+			// with the inotify kernel state which has already deleted the watch
+			// automatically.
+			if ok && mask&unix.IN_DELETE_SELF == unix.IN_DELETE_SELF {
+				delete(w.paths, int(raw.Wd))
+				delete(w.watches, name)
+			}
+			w.mu.Unlock()
+
+			if nameLen > 0 {
+				// Point "bytes" at the first byte of the filename
+				bytes := (*[unix.PathMax]byte)(unsafe.Pointer(&buf[offset+unix.SizeofInotifyEvent]))
+				// The filename is padded with NULL bytes. TrimRight() gets rid of those.
+				name += "/" + strings.TrimRight(string(bytes[0:nameLen]), "\000")
+			}
+
+			event := newEvent(name, mask)
+
+			// Send the events that are not ignored on the events channel
+			if !event.ignoreLinux(mask) {
+				select {
+				case w.Events <- event:
+				case <-w.done:
+					return
+				}
+			}
+
+			// Move to the next event in the buffer
+			offset += unix.SizeofInotifyEvent + nameLen
+		}
+	}
+}
+
+// Certain types of events can be "ignored" and not sent over the Events
+// channel. Such as events marked ignore by the kernel, or MODIFY events
+// against files that do not exist.
+func (e *Event) ignoreLinux(mask uint32) bool {
+	// Ignore anything the inotify API says to ignore
+	if mask&unix.IN_IGNORED == unix.IN_IGNORED {
+		return true
+	}
+
+	// If the event is not a DELETE or RENAME, the file must exist.
+	// Otherwise the event is ignored.
+	// *Note*: this was put in place because it was seen that a MODIFY
+	// event was sent after the DELETE. This ignores that MODIFY and
+	// assumes a DELETE will come or has come if the file doesn't exist.
+	if !(e.Op&Remove == Remove || e.Op&Rename == Rename) {
+		_, statErr := os.Lstat(e.Name)
+		return os.IsNotExist(statErr)
+	}
+	return false
+}
+
+// newEvent returns an platform-independent Event based on an inotify mask.
+func newEvent(name string, mask uint32) Event {
+	e := Event{Name: name}
+	if mask&unix.IN_CREATE == unix.IN_CREATE || mask&unix.IN_MOVED_TO == unix.IN_MOVED_TO {
+		e.Op |= Create
+	}
+	if mask&unix.IN_DELETE_SELF == unix.IN_DELETE_SELF || mask&unix.IN_DELETE == unix.IN_DELETE {
+		e.Op |= Remove
+	}
+	if mask&unix.IN_MODIFY == unix.IN_MODIFY {
+		e.Op |= Write
+	}
+	if mask&unix.IN_MOVE_SELF == unix.IN_MOVE_SELF || mask&unix.IN_MOVED_FROM == unix.IN_MOVED_FROM {
+		e.Op |= Rename
+	}
+	if mask&unix.IN_ATTRIB == unix.IN_ATTRIB {
+		e.Op |= Chmod
+	}
+	return e
+}

backend/vendor/github.com/fsnotify/fsnotify/inotify_poller.go

@@ -0,0 +1,187 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build linux
+
+package fsnotify
+
+import (
+	"errors"
+
+	"golang.org/x/sys/unix"
+)
+
+type fdPoller struct {
+	fd   int    // File descriptor (as returned by the inotify_init() syscall)
+	epfd int    // Epoll file descriptor
+	pipe [2]int // Pipe for waking up
+}
+
+func emptyPoller(fd int) *fdPoller {
+	poller := new(fdPoller)
+	poller.fd = fd
+	poller.epfd = -1
+	poller.pipe[0] = -1
+	poller.pipe[1] = -1
+	return poller
+}
+
+// Create a new inotify poller.
+// This creates an inotify handler, and an epoll handler.
+func newFdPoller(fd int) (*fdPoller, error) {
+	var errno error
+	poller := emptyPoller(fd)
+	defer func() {
+		if errno != nil {
+			poller.close()
+		}
+	}()
+	poller.fd = fd
+
+	// Create epoll fd
+	poller.epfd, errno = unix.EpollCreate1(0)
+	if poller.epfd == -1 {
+		return nil, errno
+	}
+	// Create pipe; pipe[0] is the read end, pipe[1] the write end.
+	errno = unix.Pipe2(poller.pipe[:], unix.O_NONBLOCK)
+	if errno != nil {
+		return nil, errno
+	}
+
+	// Register inotify fd with epoll
+	event := unix.EpollEvent{
+		Fd:     int32(poller.fd),
+		Events: unix.EPOLLIN,
+	}
+	errno = unix.EpollCtl(poller.epfd, unix.EPOLL_CTL_ADD, poller.fd, &event)
+	if errno != nil {
+		return nil, errno
+	}
+
+	// Register pipe fd with epoll
+	event = unix.EpollEvent{
+		Fd:     int32(poller.pipe[0]),
+		Events: unix.EPOLLIN,
+	}
+	errno = unix.EpollCtl(poller.epfd, unix.EPOLL_CTL_ADD, poller.pipe[0], &event)
+	if errno != nil {
+		return nil, errno
+	}
+
+	return poller, nil
+}
+
+// Wait using epoll.
+// Returns true if something is ready to be read,
+// false if there is not.
+func (poller *fdPoller) wait() (bool, error) {
+	// 3 possible events per fd, and 2 fds, makes a maximum of 6 events.
+	// I don't know whether epoll_wait returns the number of events returned,
+	// or the total number of events ready.
+	// I decided to catch both by making the buffer one larger than the maximum.
+	events := make([]unix.EpollEvent, 7)
+	for {
+		n, errno := unix.EpollWait(poller.epfd, events, -1)
+		if n == -1 {
+			if errno == unix.EINTR {
+				continue
+			}
+			return false, errno
+		}
+		if n == 0 {
+			// If there are no events, try again.
+			continue
+		}
+		if n > 6 {
+			// This should never happen. More events were returned than should be possible.
+			return false, errors.New("epoll_wait returned more events than I know what to do with")
+		}
+		ready := events[:n]
+		epollhup := false
+		epollerr := false
+		epollin := false
+		for _, event := range ready {
+			if event.Fd == int32(poller.fd) {
+				if event.Events&unix.EPOLLHUP != 0 {
+					// This should not happen, but if it does, treat it as a wakeup.
+					epollhup = true
+				}
+				if event.Events&unix.EPOLLERR != 0 {
+					// If an error is waiting on the file descriptor, we should pretend
+					// something is ready to read, and let unix.Read pick up the error.
+					epollerr = true
+				}
+				if event.Events&unix.EPOLLIN != 0 {
+					// There is data to read.
+					epollin = true
+				}
+			}
+			if event.Fd == int32(poller.pipe[0]) {
+				if event.Events&unix.EPOLLHUP != 0 {
+					// Write pipe descriptor was closed, by us. This means we're closing down the
+					// watcher, and we should wake up.
+				}
+				if event.Events&unix.EPOLLERR != 0 {
+					// If an error is waiting on the pipe file descriptor.
+					// This is an absolute mystery, and should never ever happen.
+					return false, errors.New("Error on the pipe descriptor.")
+				}
+				if event.Events&unix.EPOLLIN != 0 {
+					// This is a regular wakeup, so we have to clear the buffer.
+					err := poller.clearWake()
+					if err != nil {
+						return false, err
+					}
+				}
+			}
+		}
+
+		if epollhup || epollerr || epollin {
+			return true, nil
+		}
+		return false, nil
+	}
+}
+
+// Close the write end of the poller.
+func (poller *fdPoller) wake() error {
+	buf := make([]byte, 1)
+	n, errno := unix.Write(poller.pipe[1], buf)
+	if n == -1 {
+		if errno == unix.EAGAIN {
+			// Buffer is full, poller will wake.
+			return nil
+		}
+		return errno
+	}
+	return nil
+}
+
+func (poller *fdPoller) clearWake() error {
+	// You have to be woken up a LOT in order to get to 100!
+	buf := make([]byte, 100)
+	n, errno := unix.Read(poller.pipe[0], buf)
+	if n == -1 {
+		if errno == unix.EAGAIN {
+			// Buffer is empty, someone else cleared our wake.
+			return nil
+		}
+		return errno
+	}
+	return nil
+}
+
+// Close all poller file descriptors, but not the one passed to it.
+func (poller *fdPoller) close() {
+	if poller.pipe[1] != -1 {
+		unix.Close(poller.pipe[1])
+	}
+	if poller.pipe[0] != -1 {
+		unix.Close(poller.pipe[0])
+	}
+	if poller.epfd != -1 {
+		unix.Close(poller.epfd)
+	}
+}

backend/vendor/github.com/fsnotify/fsnotify/kqueue.go

@@ -0,0 +1,521 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build freebsd openbsd netbsd dragonfly darwin
+
+package fsnotify
+
+import (
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"sync"
+	"time"
+
+	"golang.org/x/sys/unix"
+)
+
+// Watcher watches a set of files, delivering events to a channel.
+type Watcher struct {
+	Events chan Event
+	Errors chan error
+	done   chan struct{} // Channel for sending a "quit message" to the reader goroutine
+
+	kq int // File descriptor (as returned by the kqueue() syscall).
+
+	mu              sync.Mutex        // Protects access to watcher data
+	watches         map[string]int    // Map of watched file descriptors (key: path).
+	externalWatches map[string]bool   // Map of watches added by user of the library.
+	dirFlags        map[string]uint32 // Map of watched directories to fflags used in kqueue.
+	paths           map[int]pathInfo  // Map file descriptors to path names for processing kqueue events.
+	fileExists      map[string]bool   // Keep track of if we know this file exists (to stop duplicate create events).
+	isClosed        bool              // Set to true when Close() is first called
+}
+
+type pathInfo struct {
+	name  string
+	isDir bool
+}
+
+// NewWatcher establishes a new watcher with the underlying OS and begins waiting for events.
+func NewWatcher() (*Watcher, error) {
+	kq, err := kqueue()
+	if err != nil {
+		return nil, err
+	}
+
+	w := &Watcher{
+		kq:              kq,
+		watches:         make(map[string]int),
+		dirFlags:        make(map[string]uint32),
+		paths:           make(map[int]pathInfo),
+		fileExists:      make(map[string]bool),
+		externalWatches: make(map[string]bool),
+		Events:          make(chan Event),
+		Errors:          make(chan error),
+		done:            make(chan struct{}),
+	}
+
+	go w.readEvents()
+	return w, nil
+}
+
+// Close removes all watches and closes the events channel.
+func (w *Watcher) Close() error {
+	w.mu.Lock()
+	if w.isClosed {
+		w.mu.Unlock()
+		return nil
+	}
+	w.isClosed = true
+
+	// copy paths to remove while locked
+	var pathsToRemove = make([]string, 0, len(w.watches))
+	for name := range w.watches {
+		pathsToRemove = append(pathsToRemove, name)
+	}
+	w.mu.Unlock()
+	// unlock before calling Remove, which also locks
+
+	for _, name := range pathsToRemove {
+		w.Remove(name)
+	}
+
+	// send a "quit" message to the reader goroutine
+	close(w.done)
+
+	return nil
+}
+
+// Add starts watching the named file or directory (non-recursively).
+func (w *Watcher) Add(name string) error {
+	w.mu.Lock()
+	w.externalWatches[name] = true
+	w.mu.Unlock()
+	_, err := w.addWatch(name, noteAllEvents)
+	return err
+}
+
+// Remove stops watching the the named file or directory (non-recursively).
+func (w *Watcher) Remove(name string) error {
+	name = filepath.Clean(name)
+	w.mu.Lock()
+	watchfd, ok := w.watches[name]
+	w.mu.Unlock()
+	if !ok {
+		return fmt.Errorf("can't remove non-existent kevent watch for: %s", name)
+	}
+
+	const registerRemove = unix.EV_DELETE
+	if err := register(w.kq, []int{watchfd}, registerRemove, 0); err != nil {
+		return err
+	}
+
+	unix.Close(watchfd)
+
+	w.mu.Lock()
+	isDir := w.paths[watchfd].isDir
+	delete(w.watches, name)
+	delete(w.paths, watchfd)
+	delete(w.dirFlags, name)
+	w.mu.Unlock()
+
+	// Find all watched paths that are in this directory that are not external.
+	if isDir {
+		var pathsToRemove []string
+		w.mu.Lock()
+		for _, path := range w.paths {
+			wdir, _ := filepath.Split(path.name)
+			if filepath.Clean(wdir) == name {
+				if !w.externalWatches[path.name] {
+					pathsToRemove = append(pathsToRemove, path.name)
+				}
+			}
+		}
+		w.mu.Unlock()
+		for _, name := range pathsToRemove {
+			// Since these are internal, not much sense in propagating error
+			// to the user, as that will just confuse them with an error about
+			// a path they did not explicitly watch themselves.
+			w.Remove(name)
+		}
+	}
+
+	return nil
+}
+
+// Watch all events (except NOTE_EXTEND, NOTE_LINK, NOTE_REVOKE)
+const noteAllEvents = unix.NOTE_DELETE | unix.NOTE_WRITE | unix.NOTE_ATTRIB | unix.NOTE_RENAME
+
+// keventWaitTime to block on each read from kevent
+var keventWaitTime = durationToTimespec(100 * time.Millisecond)
+
+// addWatch adds name to the watched file set.
+// The flags are interpreted as described in kevent(2).
+// Returns the real path to the file which was added, if any, which may be different from the one passed in the case of symlinks.
+func (w *Watcher) addWatch(name string, flags uint32) (string, error) {
+	var isDir bool
+	// Make ./name and name equivalent
+	name = filepath.Clean(name)
+
+	w.mu.Lock()
+	if w.isClosed {
+		w.mu.Unlock()
+		return "", errors.New("kevent instance already closed")
+	}
+	watchfd, alreadyWatching := w.watches[name]
+	// We already have a watch, but we can still override flags.
+	if alreadyWatching {
+		isDir = w.paths[watchfd].isDir
+	}
+	w.mu.Unlock()
+
+	if !alreadyWatching {
+		fi, err := os.Lstat(name)
+		if err != nil {
+			return "", err
+		}
+
+		// Don't watch sockets.
+		if fi.Mode()&os.ModeSocket == os.ModeSocket {
+			return "", nil
+		}
+
+		// Don't watch named pipes.
+		if fi.Mode()&os.ModeNamedPipe == os.ModeNamedPipe {
+			return "", nil
+		}
+
+		// Follow Symlinks
+		// Unfortunately, Linux can add bogus symlinks to watch list without
+		// issue, and Windows can't do symlinks period (AFAIK). To  maintain
+		// consistency, we will act like everything is fine. There will simply
+		// be no file events for broken symlinks.
+		// Hence the returns of nil on errors.
+		if fi.Mode()&os.ModeSymlink == os.ModeSymlink {
+			name, err = filepath.EvalSymlinks(name)
+			if err != nil {
+				return "", nil
+			}
+
+			w.mu.Lock()
+			_, alreadyWatching = w.watches[name]
+			w.mu.Unlock()
+
+			if alreadyWatching {
+				return name, nil
+			}
+
+			fi, err = os.Lstat(name)
+			if err != nil {
+				return "", nil
+			}
+		}
+
+		watchfd, err = unix.Open(name, openMode, 0700)
+		if watchfd == -1 {
+			return "", err
+		}
+
+		isDir = fi.IsDir()
+	}
+
+	const registerAdd = unix.EV_ADD | unix.EV_CLEAR | unix.EV_ENABLE
+	if err := register(w.kq, []int{watchfd}, registerAdd, flags); err != nil {
+		unix.Close(watchfd)
+		return "", err
+	}
+
+	if !alreadyWatching {
+		w.mu.Lock()
+		w.watches[name] = watchfd
+		w.paths[watchfd] = pathInfo{name: name, isDir: isDir}
+		w.mu.Unlock()
+	}
+
+	if isDir {
+		// Watch the directory if it has not been watched before,
+		// or if it was watched before, but perhaps only a NOTE_DELETE (watchDirectoryFiles)
+		w.mu.Lock()
+
+		watchDir := (flags&unix.NOTE_WRITE) == unix.NOTE_WRITE &&
+			(!alreadyWatching || (w.dirFlags[name]&unix.NOTE_WRITE) != unix.NOTE_WRITE)
+		// Store flags so this watch can be updated later
+		w.dirFlags[name] = flags
+		w.mu.Unlock()
+
+		if watchDir {
+			if err := w.watchDirectoryFiles(name); err != nil {
+				return "", err
+			}
+		}
+	}
+	return name, nil
+}
+
+// readEvents reads from kqueue and converts the received kevents into
+// Event values that it sends down the Events channel.
+func (w *Watcher) readEvents() {
+	eventBuffer := make([]unix.Kevent_t, 10)
+
+loop:
+	for {
+		// See if there is a message on the "done" channel
+		select {
+		case <-w.done:
+			break loop
+		default:
+		}
+
+		// Get new events
+		kevents, err := read(w.kq, eventBuffer, &keventWaitTime)
+		// EINTR is okay, the syscall was interrupted before timeout expired.
+		if err != nil && err != unix.EINTR {
+			select {
+			case w.Errors <- err:
+			case <-w.done:
+				break loop
+			}
+			continue
+		}
+
+		// Flush the events we received to the Events channel
+		for len(kevents) > 0 {
+			kevent := &kevents[0]
+			watchfd := int(kevent.Ident)
+			mask := uint32(kevent.Fflags)
+			w.mu.Lock()
+			path := w.paths[watchfd]
+			w.mu.Unlock()
+			event := newEvent(path.name, mask)
+
+			if path.isDir && !(event.Op&Remove == Remove) {
+				// Double check to make sure the directory exists. This can happen when
+				// we do a rm -fr on a recursively watched folders and we receive a
+				// modification event first but the folder has been deleted and later
+				// receive the delete event
+				if _, err := os.Lstat(event.Name); os.IsNotExist(err) {
+					// mark is as delete event
+					event.Op |= Remove
+				}
+			}
+
+			if event.Op&Rename == Rename || event.Op&Remove == Remove {
+				w.Remove(event.Name)
+				w.mu.Lock()
+				delete(w.fileExists, event.Name)
+				w.mu.Unlock()
+			}
+
+			if path.isDir && event.Op&Write == Write && !(event.Op&Remove == Remove) {
+				w.sendDirectoryChangeEvents(event.Name)
+			} else {
+				// Send the event on the Events channel.
+				select {
+				case w.Events <- event:
+				case <-w.done:
+					break loop
+				}
+			}
+
+			if event.Op&Remove == Remove {
+				// Look for a file that may have overwritten this.
+				// For example, mv f1 f2 will delete f2, then create f2.
+				if path.isDir {
+					fileDir := filepath.Clean(event.Name)
+					w.mu.Lock()
+					_, found := w.watches[fileDir]
+					w.mu.Unlock()
+					if found {
+						// make sure the directory exists before we watch for changes. When we
+						// do a recursive watch and perform rm -fr, the parent directory might
+						// have gone missing, ignore the missing directory and let the
+						// upcoming delete event remove the watch from the parent directory.
+						if _, err := os.Lstat(fileDir); err == nil {
+							w.sendDirectoryChangeEvents(fileDir)
+						}
+					}
+				} else {
+					filePath := filepath.Clean(event.Name)
+					if fileInfo, err := os.Lstat(filePath); err == nil {
+						w.sendFileCreatedEventIfNew(filePath, fileInfo)
+					}
+				}
+			}
+
+			// Move to next event
+			kevents = kevents[1:]
+		}
+	}
+
+	// cleanup
+	err := unix.Close(w.kq)
+	if err != nil {
+		// only way the previous loop breaks is if w.done was closed so we need to async send to w.Errors.
+		select {
+		case w.Errors <- err:
+		default:
+		}
+	}
+	close(w.Events)
+	close(w.Errors)
+}
+
+// newEvent returns an platform-independent Event based on kqueue Fflags.
+func newEvent(name string, mask uint32) Event {
+	e := Event{Name: name}
+	if mask&unix.NOTE_DELETE == unix.NOTE_DELETE {
+		e.Op |= Remove
+	}
+	if mask&unix.NOTE_WRITE == unix.NOTE_WRITE {
+		e.Op |= Write
+	}
+	if mask&unix.NOTE_RENAME == unix.NOTE_RENAME {
+		e.Op |= Rename
+	}
+	if mask&unix.NOTE_ATTRIB == unix.NOTE_ATTRIB {
+		e.Op |= Chmod
+	}
+	return e
+}
+
+func newCreateEvent(name string) Event {
+	return Event{Name: name, Op: Create}
+}
+
+// watchDirectoryFiles to mimic inotify when adding a watch on a directory
+func (w *Watcher) watchDirectoryFiles(dirPath string) error {
+	// Get all files
+	files, err := ioutil.ReadDir(dirPath)
+	if err != nil {
+		return err
+	}
+
+	for _, fileInfo := range files {
+		filePath := filepath.Join(dirPath, fileInfo.Name())
+		filePath, err = w.internalWatch(filePath, fileInfo)
+		if err != nil {
+			return err
+		}
+
+		w.mu.Lock()
+		w.fileExists[filePath] = true
+		w.mu.Unlock()
+	}
+
+	return nil
+}
+
+// sendDirectoryEvents searches the directory for newly created files
+// and sends them over the event channel. This functionality is to have
+// the BSD version of fsnotify match Linux inotify which provides a
+// create event for files created in a watched directory.
+func (w *Watcher) sendDirectoryChangeEvents(dirPath string) {
+	// Get all files
+	files, err := ioutil.ReadDir(dirPath)
+	if err != nil {
+		select {
+		case w.Errors <- err:
+		case <-w.done:
+			return
+		}
+	}
+
+	// Search for new files
+	for _, fileInfo := range files {
+		filePath := filepath.Join(dirPath, fileInfo.Name())
+		err := w.sendFileCreatedEventIfNew(filePath, fileInfo)
+
+		if err != nil {
+			return
+		}
+	}
+}
+
+// sendFileCreatedEvent sends a create event if the file isn't already being tracked.
+func (w *Watcher) sendFileCreatedEventIfNew(filePath string, fileInfo os.FileInfo) (err error) {
+	w.mu.Lock()
+	_, doesExist := w.fileExists[filePath]
+	w.mu.Unlock()
+	if !doesExist {
+		// Send create event
+		select {
+		case w.Events <- newCreateEvent(filePath):
+		case <-w.done:
+			return
+		}
+	}
+
+	// like watchDirectoryFiles (but without doing another ReadDir)
+	filePath, err = w.internalWatch(filePath, fileInfo)
+	if err != nil {
+		return err
+	}
+
+	w.mu.Lock()
+	w.fileExists[filePath] = true
+	w.mu.Unlock()
+
+	return nil
+}
+
+func (w *Watcher) internalWatch(name string, fileInfo os.FileInfo) (string, error) {
+	if fileInfo.IsDir() {
+		// mimic Linux providing delete events for subdirectories
+		// but preserve the flags used if currently watching subdirectory
+		w.mu.Lock()
+		flags := w.dirFlags[name]
+		w.mu.Unlock()
+
+		flags |= unix.NOTE_DELETE | unix.NOTE_RENAME
+		return w.addWatch(name, flags)
+	}
+
+	// watch file to mimic Linux inotify
+	return w.addWatch(name, noteAllEvents)
+}
+
+// kqueue creates a new kernel event queue and returns a descriptor.
+func kqueue() (kq int, err error) {
+	kq, err = unix.Kqueue()
+	if kq == -1 {
+		return kq, err
+	}
+	return kq, nil
+}
+
+// register events with the queue
+func register(kq int, fds []int, flags int, fflags uint32) error {
+	changes := make([]unix.Kevent_t, len(fds))
+
+	for i, fd := range fds {
+		// SetKevent converts int to the platform-specific types:
+		unix.SetKevent(&changes[i], fd, unix.EVFILT_VNODE, flags)
+		changes[i].Fflags = fflags
+	}
+
+	// register the events
+	success, err := unix.Kevent(kq, changes, nil, nil)
+	if success == -1 {
+		return err
+	}
+	return nil
+}
+
+// read retrieves pending events, or waits until an event occurs.
+// A timeout of nil blocks indefinitely, while 0 polls the queue.
+func read(kq int, events []unix.Kevent_t, timeout *unix.Timespec) ([]unix.Kevent_t, error) {
+	n, err := unix.Kevent(kq, nil, events, timeout)
+	if err != nil {
+		return nil, err
+	}
+	return events[0:n], nil
+}
+
+// durationToTimespec prepares a timeout value
+func durationToTimespec(d time.Duration) unix.Timespec {
+	return unix.NsecToTimespec(d.Nanoseconds())
+}

backend/vendor/github.com/fsnotify/fsnotify/open_mode_bsd.go

@@ -0,0 +1,11 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build freebsd openbsd netbsd dragonfly
+
+package fsnotify
+
+import "golang.org/x/sys/unix"
+
+const openMode = unix.O_NONBLOCK | unix.O_RDONLY

backend/vendor/github.com/fsnotify/fsnotify/open_mode_darwin.go

@@ -0,0 +1,12 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build darwin
+
+package fsnotify
+
+import "golang.org/x/sys/unix"
+
+// note: this constant is not defined on BSD
+const openMode = unix.O_EVTONLY

backend/vendor/github.com/fsnotify/fsnotify/windows.go

@@ -0,0 +1,561 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build windows
+
+package fsnotify
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+	"sync"
+	"syscall"
+	"unsafe"
+)
+
+// Watcher watches a set of files, delivering events to a channel.
+type Watcher struct {
+	Events   chan Event
+	Errors   chan error
+	isClosed bool           // Set to true when Close() is first called
+	mu       sync.Mutex     // Map access
+	port     syscall.Handle // Handle to completion port
+	watches  watchMap       // Map of watches (key: i-number)
+	input    chan *input    // Inputs to the reader are sent on this channel
+	quit     chan chan<- error
+}
+
+// NewWatcher establishes a new watcher with the underlying OS and begins waiting for events.
+func NewWatcher() (*Watcher, error) {
+	port, e := syscall.CreateIoCompletionPort(syscall.InvalidHandle, 0, 0, 0)
+	if e != nil {
+		return nil, os.NewSyscallError("CreateIoCompletionPort", e)
+	}
+	w := &Watcher{
+		port:    port,
+		watches: make(watchMap),
+		input:   make(chan *input, 1),
+		Events:  make(chan Event, 50),
+		Errors:  make(chan error),
+		quit:    make(chan chan<- error, 1),
+	}
+	go w.readEvents()
+	return w, nil
+}
+
+// Close removes all watches and closes the events channel.
+func (w *Watcher) Close() error {
+	if w.isClosed {
+		return nil
+	}
+	w.isClosed = true
+
+	// Send "quit" message to the reader goroutine
+	ch := make(chan error)
+	w.quit <- ch
+	if err := w.wakeupReader(); err != nil {
+		return err
+	}
+	return <-ch
+}
+
+// Add starts watching the named file or directory (non-recursively).
+func (w *Watcher) Add(name string) error {
+	if w.isClosed {
+		return errors.New("watcher already closed")
+	}
+	in := &input{
+		op:    opAddWatch,
+		path:  filepath.Clean(name),
+		flags: sysFSALLEVENTS,
+		reply: make(chan error),
+	}
+	w.input <- in
+	if err := w.wakeupReader(); err != nil {
+		return err
+	}
+	return <-in.reply
+}
+
+// Remove stops watching the the named file or directory (non-recursively).
+func (w *Watcher) Remove(name string) error {
+	in := &input{
+		op:    opRemoveWatch,
+		path:  filepath.Clean(name),
+		reply: make(chan error),
+	}
+	w.input <- in
+	if err := w.wakeupReader(); err != nil {
+		return err
+	}
+	return <-in.reply
+}
+
+const (
+	// Options for AddWatch
+	sysFSONESHOT = 0x80000000
+	sysFSONLYDIR = 0x1000000
+
+	// Events
+	sysFSACCESS     = 0x1
+	sysFSALLEVENTS  = 0xfff
+	sysFSATTRIB     = 0x4
+	sysFSCLOSE      = 0x18
+	sysFSCREATE     = 0x100
+	sysFSDELETE     = 0x200
+	sysFSDELETESELF = 0x400
+	sysFSMODIFY     = 0x2
+	sysFSMOVE       = 0xc0
+	sysFSMOVEDFROM  = 0x40
+	sysFSMOVEDTO    = 0x80
+	sysFSMOVESELF   = 0x800
+
+	// Special events
+	sysFSIGNORED   = 0x8000
+	sysFSQOVERFLOW = 0x4000
+)
+
+func newEvent(name string, mask uint32) Event {
+	e := Event{Name: name}
+	if mask&sysFSCREATE == sysFSCREATE || mask&sysFSMOVEDTO == sysFSMOVEDTO {
+		e.Op |= Create
+	}
+	if mask&sysFSDELETE == sysFSDELETE || mask&sysFSDELETESELF == sysFSDELETESELF {
+		e.Op |= Remove
+	}
+	if mask&sysFSMODIFY == sysFSMODIFY {
+		e.Op |= Write
+	}
+	if mask&sysFSMOVE == sysFSMOVE || mask&sysFSMOVESELF == sysFSMOVESELF || mask&sysFSMOVEDFROM == sysFSMOVEDFROM {
+		e.Op |= Rename
+	}
+	if mask&sysFSATTRIB == sysFSATTRIB {
+		e.Op |= Chmod
+	}
+	return e
+}
+
+const (
+	opAddWatch = iota
+	opRemoveWatch
+)
+
+const (
+	provisional uint64 = 1 << (32 + iota)
+)
+
+type input struct {
+	op    int
+	path  string
+	flags uint32
+	reply chan error
+}
+
+type inode struct {
+	handle syscall.Handle
+	volume uint32
+	index  uint64
+}
+
+type watch struct {
+	ov     syscall.Overlapped
+	ino    *inode            // i-number
+	path   string            // Directory path
+	mask   uint64            // Directory itself is being watched with these notify flags
+	names  map[string]uint64 // Map of names being watched and their notify flags
+	rename string            // Remembers the old name while renaming a file
+	buf    [4096]byte
+}
+
+type indexMap map[uint64]*watch
+type watchMap map[uint32]indexMap
+
+func (w *Watcher) wakeupReader() error {
+	e := syscall.PostQueuedCompletionStatus(w.port, 0, 0, nil)
+	if e != nil {
+		return os.NewSyscallError("PostQueuedCompletionStatus", e)
+	}
+	return nil
+}
+
+func getDir(pathname string) (dir string, err error) {
+	attr, e := syscall.GetFileAttributes(syscall.StringToUTF16Ptr(pathname))
+	if e != nil {
+		return "", os.NewSyscallError("GetFileAttributes", e)
+	}
+	if attr&syscall.FILE_ATTRIBUTE_DIRECTORY != 0 {
+		dir = pathname
+	} else {
+		dir, _ = filepath.Split(pathname)
+		dir = filepath.Clean(dir)
+	}
+	return
+}
+
+func getIno(path string) (ino *inode, err error) {
+	h, e := syscall.CreateFile(syscall.StringToUTF16Ptr(path),
+		syscall.FILE_LIST_DIRECTORY,
+		syscall.FILE_SHARE_READ|syscall.FILE_SHARE_WRITE|syscall.FILE_SHARE_DELETE,
+		nil, syscall.OPEN_EXISTING,
+		syscall.FILE_FLAG_BACKUP_SEMANTICS|syscall.FILE_FLAG_OVERLAPPED, 0)
+	if e != nil {
+		return nil, os.NewSyscallError("CreateFile", e)
+	}
+	var fi syscall.ByHandleFileInformation
+	if e = syscall.GetFileInformationByHandle(h, &fi); e != nil {
+		syscall.CloseHandle(h)
+		return nil, os.NewSyscallError("GetFileInformationByHandle", e)
+	}
+	ino = &inode{
+		handle: h,
+		volume: fi.VolumeSerialNumber,
+		index:  uint64(fi.FileIndexHigh)<<32 | uint64(fi.FileIndexLow),
+	}
+	return ino, nil
+}
+
+// Must run within the I/O thread.
+func (m watchMap) get(ino *inode) *watch {
+	if i := m[ino.volume]; i != nil {
+		return i[ino.index]
+	}
+	return nil
+}
+
+// Must run within the I/O thread.
+func (m watchMap) set(ino *inode, watch *watch) {
+	i := m[ino.volume]
+	if i == nil {
+		i = make(indexMap)
+		m[ino.volume] = i
+	}
+	i[ino.index] = watch
+}
+
+// Must run within the I/O thread.
+func (w *Watcher) addWatch(pathname string, flags uint64) error {
+	dir, err := getDir(pathname)
+	if err != nil {
+		return err
+	}
+	if flags&sysFSONLYDIR != 0 && pathname != dir {
+		return nil
+	}
+	ino, err := getIno(dir)
+	if err != nil {
+		return err
+	}
+	w.mu.Lock()
+	watchEntry := w.watches.get(ino)
+	w.mu.Unlock()
+	if watchEntry == nil {
+		if _, e := syscall.CreateIoCompletionPort(ino.handle, w.port, 0, 0); e != nil {
+			syscall.CloseHandle(ino.handle)
+			return os.NewSyscallError("CreateIoCompletionPort", e)
+		}
+		watchEntry = &watch{
+			ino:   ino,
+			path:  dir,
+			names: make(map[string]uint64),
+		}
+		w.mu.Lock()
+		w.watches.set(ino, watchEntry)
+		w.mu.Unlock()
+		flags |= provisional
+	} else {
+		syscall.CloseHandle(ino.handle)
+	}
+	if pathname == dir {
+		watchEntry.mask |= flags
+	} else {
+		watchEntry.names[filepath.Base(pathname)] |= flags
+	}
+	if err = w.startRead(watchEntry); err != nil {
+		return err
+	}
+	if pathname == dir {
+		watchEntry.mask &= ^provisional
+	} else {
+		watchEntry.names[filepath.Base(pathname)] &= ^provisional
+	}
+	return nil
+}
+
+// Must run within the I/O thread.
+func (w *Watcher) remWatch(pathname string) error {
+	dir, err := getDir(pathname)
+	if err != nil {
+		return err
+	}
+	ino, err := getIno(dir)
+	if err != nil {
+		return err
+	}
+	w.mu.Lock()
+	watch := w.watches.get(ino)
+	w.mu.Unlock()
+	if watch == nil {
+		return fmt.Errorf("can't remove non-existent watch for: %s", pathname)
+	}
+	if pathname == dir {
+		w.sendEvent(watch.path, watch.mask&sysFSIGNORED)
+		watch.mask = 0
+	} else {
+		name := filepath.Base(pathname)
+		w.sendEvent(filepath.Join(watch.path, name), watch.names[name]&sysFSIGNORED)
+		delete(watch.names, name)
+	}
+	return w.startRead(watch)
+}
+
+// Must run within the I/O thread.
+func (w *Watcher) deleteWatch(watch *watch) {
+	for name, mask := range watch.names {
+		if mask&provisional == 0 {
+			w.sendEvent(filepath.Join(watch.path, name), mask&sysFSIGNORED)
+		}
+		delete(watch.names, name)
+	}
+	if watch.mask != 0 {
+		if watch.mask&provisional == 0 {
+			w.sendEvent(watch.path, watch.mask&sysFSIGNORED)
+		}
+		watch.mask = 0
+	}
+}
+
+// Must run within the I/O thread.
+func (w *Watcher) startRead(watch *watch) error {
+	if e := syscall.CancelIo(watch.ino.handle); e != nil {
+		w.Errors <- os.NewSyscallError("CancelIo", e)
+		w.deleteWatch(watch)
+	}
+	mask := toWindowsFlags(watch.mask)
+	for _, m := range watch.names {
+		mask |= toWindowsFlags(m)
+	}
+	if mask == 0 {
+		if e := syscall.CloseHandle(watch.ino.handle); e != nil {
+			w.Errors <- os.NewSyscallError("CloseHandle", e)
+		}
+		w.mu.Lock()
+		delete(w.watches[watch.ino.volume], watch.ino.index)
+		w.mu.Unlock()
+		return nil
+	}
+	e := syscall.ReadDirectoryChanges(watch.ino.handle, &watch.buf[0],
+		uint32(unsafe.Sizeof(watch.buf)), false, mask, nil, &watch.ov, 0)
+	if e != nil {
+		err := os.NewSyscallError("ReadDirectoryChanges", e)
+		if e == syscall.ERROR_ACCESS_DENIED && watch.mask&provisional == 0 {
+			// Watched directory was probably removed
+			if w.sendEvent(watch.path, watch.mask&sysFSDELETESELF) {
+				if watch.mask&sysFSONESHOT != 0 {
+					watch.mask = 0
+				}
+			}
+			err = nil
+		}
+		w.deleteWatch(watch)
+		w.startRead(watch)
+		return err
+	}
+	return nil
+}
+
+// readEvents reads from the I/O completion port, converts the
+// received events into Event objects and sends them via the Events channel.
+// Entry point to the I/O thread.
+func (w *Watcher) readEvents() {
+	var (
+		n, key uint32
+		ov     *syscall.Overlapped
+	)
+	runtime.LockOSThread()
+
+	for {
+		e := syscall.GetQueuedCompletionStatus(w.port, &n, &key, &ov, syscall.INFINITE)
+		watch := (*watch)(unsafe.Pointer(ov))
+
+		if watch == nil {
+			select {
+			case ch := <-w.quit:
+				w.mu.Lock()
+				var indexes []indexMap
+				for _, index := range w.watches {
+					indexes = append(indexes, index)
+				}
+				w.mu.Unlock()
+				for _, index := range indexes {
+					for _, watch := range index {
+						w.deleteWatch(watch)
+						w.startRead(watch)
+					}
+				}
+				var err error
+				if e := syscall.CloseHandle(w.port); e != nil {
+					err = os.NewSyscallError("CloseHandle", e)
+				}
+				close(w.Events)
+				close(w.Errors)
+				ch <- err
+				return
+			case in := <-w.input:
+				switch in.op {
+				case opAddWatch:
+					in.reply <- w.addWatch(in.path, uint64(in.flags))
+				case opRemoveWatch:
+					in.reply <- w.remWatch(in.path)
+				}
+			default:
+			}
+			continue
+		}
+
+		switch e {
+		case syscall.ERROR_MORE_DATA:
+			if watch == nil {
+				w.Errors <- errors.New("ERROR_MORE_DATA has unexpectedly null lpOverlapped buffer")
+			} else {
+				// The i/o succeeded but the buffer is full.
+				// In theory we should be building up a full packet.
+				// In practice we can get away with just carrying on.
+				n = uint32(unsafe.Sizeof(watch.buf))
+			}
+		case syscall.ERROR_ACCESS_DENIED:
+			// Watched directory was probably removed
+			w.sendEvent(watch.path, watch.mask&sysFSDELETESELF)
+			w.deleteWatch(watch)
+			w.startRead(watch)
+			continue
+		case syscall.ERROR_OPERATION_ABORTED:
+			// CancelIo was called on this handle
+			continue
+		default:
+			w.Errors <- os.NewSyscallError("GetQueuedCompletionPort", e)
+			continue
+		case nil:
+		}
+
+		var offset uint32
+		for {
+			if n == 0 {
+				w.Events <- newEvent("", sysFSQOVERFLOW)
+				w.Errors <- errors.New("short read in readEvents()")
+				break
+			}
+
+			// Point "raw" to the event in the buffer
+			raw := (*syscall.FileNotifyInformation)(unsafe.Pointer(&watch.buf[offset]))
+			buf := (*[syscall.MAX_PATH]uint16)(unsafe.Pointer(&raw.FileName))
+			name := syscall.UTF16ToString(buf[:raw.FileNameLength/2])
+			fullname := filepath.Join(watch.path, name)
+
+			var mask uint64
+			switch raw.Action {
+			case syscall.FILE_ACTION_REMOVED:
+				mask = sysFSDELETESELF
+			case syscall.FILE_ACTION_MODIFIED:
+				mask = sysFSMODIFY
+			case syscall.FILE_ACTION_RENAMED_OLD_NAME:
+				watch.rename = name
+			case syscall.FILE_ACTION_RENAMED_NEW_NAME:
+				if watch.names[watch.rename] != 0 {
+					watch.names[name] |= watch.names[watch.rename]
+					delete(watch.names, watch.rename)
+					mask = sysFSMOVESELF
+				}
+			}
+
+			sendNameEvent := func() {
+				if w.sendEvent(fullname, watch.names[name]&mask) {
+					if watch.names[name]&sysFSONESHOT != 0 {
+						delete(watch.names, name)
+					}
+				}
+			}
+			if raw.Action != syscall.FILE_ACTION_RENAMED_NEW_NAME {
+				sendNameEvent()
+			}
+			if raw.Action == syscall.FILE_ACTION_REMOVED {
+				w.sendEvent(fullname, watch.names[name]&sysFSIGNORED)
+				delete(watch.names, name)
+			}
+			if w.sendEvent(fullname, watch.mask&toFSnotifyFlags(raw.Action)) {
+				if watch.mask&sysFSONESHOT != 0 {
+					watch.mask = 0
+				}
+			}
+			if raw.Action == syscall.FILE_ACTION_RENAMED_NEW_NAME {
+				fullname = filepath.Join(watch.path, watch.rename)
+				sendNameEvent()
+			}
+
+			// Move to the next event in the buffer
+			if raw.NextEntryOffset == 0 {
+				break
+			}
+			offset += raw.NextEntryOffset
+
+			// Error!
+			if offset >= n {
+				w.Errors <- errors.New("Windows system assumed buffer larger than it is, events have likely been missed.")
+				break
+			}
+		}
+
+		if err := w.startRead(watch); err != nil {
+			w.Errors <- err
+		}
+	}
+}
+
+func (w *Watcher) sendEvent(name string, mask uint64) bool {
+	if mask == 0 {
+		return false
+	}
+	event := newEvent(name, uint32(mask))
+	select {
+	case ch := <-w.quit:
+		w.quit <- ch
+	case w.Events <- event:
+	}
+	return true
+}
+
+func toWindowsFlags(mask uint64) uint32 {
+	var m uint32
+	if mask&sysFSACCESS != 0 {
+		m |= syscall.FILE_NOTIFY_CHANGE_LAST_ACCESS
+	}
+	if mask&sysFSMODIFY != 0 {
+		m |= syscall.FILE_NOTIFY_CHANGE_LAST_WRITE
+	}
+	if mask&sysFSATTRIB != 0 {
+		m |= syscall.FILE_NOTIFY_CHANGE_ATTRIBUTES
+	}
+	if mask&(sysFSMOVE|sysFSCREATE|sysFSDELETE) != 0 {
+		m |= syscall.FILE_NOTIFY_CHANGE_FILE_NAME | syscall.FILE_NOTIFY_CHANGE_DIR_NAME
+	}
+	return m
+}
+
+func toFSnotifyFlags(action uint32) uint64 {
+	switch action {
+	case syscall.FILE_ACTION_ADDED:
+		return sysFSCREATE
+	case syscall.FILE_ACTION_REMOVED:
+		return sysFSDELETE
+	case syscall.FILE_ACTION_MODIFIED:
+		return sysFSMODIFY
+	case syscall.FILE_ACTION_RENAMED_OLD_NAME:
+		return sysFSMOVEDFROM
+	case syscall.FILE_ACTION_RENAMED_NEW_NAME:
+		return sysFSMOVEDTO
+	}
+	return 0
+}

backend/vendor/github.com/gin-contrib/sse/.travis.yml

@@ -0,0 +1,26 @@
+language: go
+sudo: false
+go:
+  - 1.8.x
+  - 1.9.x
+  - 1.10.x
+  - 1.11.x
+  - 1.12.x
+  - master
+
+git:
+  depth: 10
+
+matrix:
+  fast_finish: true
+  include:
+  - go: 1.11.x
+    env: GO111MODULE=on
+  - go: 1.12.x
+    env: GO111MODULE=on
+
+script:
+  - go test -v -covermode=count -coverprofile=coverage.out
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash)

backend/vendor/github.com/gin-contrib/sse/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Manuel Martínez-Almeida
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

backend/vendor/github.com/gin-contrib/sse/README.md

@@ -0,0 +1,58 @@
+# Server-Sent Events
+
+[![GoDoc](https://godoc.org/github.com/gin-contrib/sse?status.svg)](https://godoc.org/github.com/gin-contrib/sse)
+[![Build Status](https://travis-ci.org/gin-contrib/sse.svg)](https://travis-ci.org/gin-contrib/sse)
+[![codecov](https://codecov.io/gh/gin-contrib/sse/branch/master/graph/badge.svg)](https://codecov.io/gh/gin-contrib/sse)
+[![Go Report Card](https://goreportcard.com/badge/github.com/gin-contrib/sse)](https://goreportcard.com/report/github.com/gin-contrib/sse)
+
+Server-sent events (SSE) is a technology where a browser receives automatic updates from a server via HTTP connection. The Server-Sent Events EventSource API is [standardized as part of HTML5[1] by the W3C](http://www.w3.org/TR/2009/WD-eventsource-20091029/).
+
+- [Read this great SSE introduction by the HTML5Rocks guys](http://www.html5rocks.com/en/tutorials/eventsource/basics/)
+- [Browser support](http://caniuse.com/#feat=eventsource)
+
+## Sample code
+
+```go
+import "github.com/gin-contrib/sse"
+
+func httpHandler(w http.ResponseWriter, req *http.Request) {
+	// data can be a primitive like a string, an integer or a float
+	sse.Encode(w, sse.Event{
+		Event: "message",
+		Data:  "some data\nmore data",
+	})
+
+	// also a complex type, like a map, a struct or a slice
+	sse.Encode(w, sse.Event{
+		Id:    "124",
+		Event: "message",
+		Data: map[string]interface{}{
+			"user":    "manu",
+			"date":    time.Now().Unix(),
+			"content": "hi!",
+		},
+	})
+}
+```
+```
+event: message
+data: some data\\nmore data
+
+id: 124
+event: message
+data: {"content":"hi!","date":1431540810,"user":"manu"}
+ 
+```
+
+## Content-Type
+
+```go
+fmt.Println(sse.ContentType)
+```
+```
+text/event-stream
+```
+
+## Decoding support
+
+There is a client-side implementation of SSE coming soon.

backend/vendor/github.com/gin-contrib/sse/sse-decoder.go

@@ -0,0 +1,116 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package sse
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+)
+
+type decoder struct {
+	events []Event
+}
+
+func Decode(r io.Reader) ([]Event, error) {
+	var dec decoder
+	return dec.decode(r)
+}
+
+func (d *decoder) dispatchEvent(event Event, data string) {
+	dataLength := len(data)
+	if dataLength > 0 {
+		//If the data buffer's last character is a U+000A LINE FEED (LF) character, then remove the last character from the data buffer.
+		data = data[:dataLength-1]
+		dataLength--
+	}
+	if dataLength == 0 && event.Event == "" {
+		return
+	}
+	if event.Event == "" {
+		event.Event = "message"
+	}
+	event.Data = data
+	d.events = append(d.events, event)
+}
+
+func (d *decoder) decode(r io.Reader) ([]Event, error) {
+	buf, err := ioutil.ReadAll(r)
+	if err != nil {
+		return nil, err
+	}
+
+	var currentEvent Event
+	var dataBuffer *bytes.Buffer = new(bytes.Buffer)
+	// TODO (and unit tests)
+	// Lines must be separated by either a U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF) character pair,
+	// a single U+000A LINE FEED (LF) character,
+	// or a single U+000D CARRIAGE RETURN (CR) character.
+	lines := bytes.Split(buf, []byte{'\n'})
+	for _, line := range lines {
+		if len(line) == 0 {
+			// If the line is empty (a blank line). Dispatch the event.
+			d.dispatchEvent(currentEvent, dataBuffer.String())
+
+			// reset current event and data buffer
+			currentEvent = Event{}
+			dataBuffer.Reset()
+			continue
+		}
+		if line[0] == byte(':') {
+			// If the line starts with a U+003A COLON character (:), ignore the line.
+			continue
+		}
+
+		var field, value []byte
+		colonIndex := bytes.IndexRune(line, ':')
+		if colonIndex != -1 {
+			// If the line contains a U+003A COLON character character (:)
+			// Collect the characters on the line before the first U+003A COLON character (:),
+			// and let field be that string.
+			field = line[:colonIndex]
+			// Collect the characters on the line after the first U+003A COLON character (:),
+			// and let value be that string.
+			value = line[colonIndex+1:]
+			// If value starts with a single U+0020 SPACE character, remove it from value.
+			if len(value) > 0 && value[0] == ' ' {
+				value = value[1:]
+			}
+		} else {
+			// Otherwise, the string is not empty but does not contain a U+003A COLON character character (:)
+			// Use the whole line as the field name, and the empty string as the field value.
+			field = line
+			value = []byte{}
+		}
+		// The steps to process the field given a field name and a field value depend on the field name,
+		// as given in the following list. Field names must be compared literally,
+		// with no case folding performed.
+		switch string(field) {
+		case "event":
+			// Set the event name buffer to field value.
+			currentEvent.Event = string(value)
+		case "id":
+			// Set the event stream's last event ID to the field value.
+			currentEvent.Id = string(value)
+		case "retry":
+			// If the field value consists of only characters in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9),
+			// then interpret the field value as an integer in base ten, and set the event stream's reconnection time to that integer.
+			// Otherwise, ignore the field.
+			currentEvent.Id = string(value)
+		case "data":
+			// Append the field value to the data buffer,
+			dataBuffer.Write(value)
+			// then append a single U+000A LINE FEED (LF) character to the data buffer.
+			dataBuffer.WriteString("\n")
+		default:
+			//Otherwise. The field is ignored.
+			continue
+		}
+	}
+	// Once the end of the file is reached, the user agent must dispatch the event one final time.
+	d.dispatchEvent(currentEvent, dataBuffer.String())
+
+	return d.events, nil
+}

backend/vendor/github.com/gin-contrib/sse/sse-encoder.go

@@ -0,0 +1,110 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package sse
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+// Server-Sent Events
+// W3C Working Draft 29 October 2009
+// http://www.w3.org/TR/2009/WD-eventsource-20091029/
+
+const ContentType = "text/event-stream"
+
+var contentType = []string{ContentType}
+var noCache = []string{"no-cache"}
+
+var fieldReplacer = strings.NewReplacer(
+	"\n", "\\n",
+	"\r", "\\r")
+
+var dataReplacer = strings.NewReplacer(
+	"\n", "\ndata:",
+	"\r", "\\r")
+
+type Event struct {
+	Event string
+	Id    string
+	Retry uint
+	Data  interface{}
+}
+
+func Encode(writer io.Writer, event Event) error {
+	w := checkWriter(writer)
+	writeId(w, event.Id)
+	writeEvent(w, event.Event)
+	writeRetry(w, event.Retry)
+	return writeData(w, event.Data)
+}
+
+func writeId(w stringWriter, id string) {
+	if len(id) > 0 {
+		w.WriteString("id:")
+		fieldReplacer.WriteString(w, id)
+		w.WriteString("\n")
+	}
+}
+
+func writeEvent(w stringWriter, event string) {
+	if len(event) > 0 {
+		w.WriteString("event:")
+		fieldReplacer.WriteString(w, event)
+		w.WriteString("\n")
+	}
+}
+
+func writeRetry(w stringWriter, retry uint) {
+	if retry > 0 {
+		w.WriteString("retry:")
+		w.WriteString(strconv.FormatUint(uint64(retry), 10))
+		w.WriteString("\n")
+	}
+}
+
+func writeData(w stringWriter, data interface{}) error {
+	w.WriteString("data:")
+	switch kindOfData(data) {
+	case reflect.Struct, reflect.Slice, reflect.Map:
+		err := json.NewEncoder(w).Encode(data)
+		if err != nil {
+			return err
+		}
+		w.WriteString("\n")
+	default:
+		dataReplacer.WriteString(w, fmt.Sprint(data))
+		w.WriteString("\n\n")
+	}
+	return nil
+}
+
+func (r Event) Render(w http.ResponseWriter) error {
+	r.WriteContentType(w)
+	return Encode(w, r)
+}
+
+func (r Event) WriteContentType(w http.ResponseWriter) {
+	header := w.Header()
+	header["Content-Type"] = contentType
+
+	if _, exist := header["Cache-Control"]; !exist {
+		header["Cache-Control"] = noCache
+	}
+}
+
+func kindOfData(data interface{}) reflect.Kind {
+	value := reflect.ValueOf(data)
+	valueType := value.Kind()
+	if valueType == reflect.Ptr {
+		valueType = value.Elem().Kind()
+	}
+	return valueType
+}

backend/vendor/github.com/gin-contrib/sse/writer.go

@@ -0,0 +1,24 @@
+package sse
+
+import "io"
+
+type stringWriter interface {
+	io.Writer
+	WriteString(string) (int, error)
+}
+
+type stringWrapper struct {
+	io.Writer
+}
+
+func (w stringWrapper) WriteString(str string) (int, error) {
+	return w.Writer.Write([]byte(str))
+}
+
+func checkWriter(writer io.Writer) stringWriter {
+	if w, ok := writer.(stringWriter); ok {
+		return w
+	} else {
+		return stringWrapper{writer}
+	}
+}

backend/vendor/github.com/gin-gonic/gin/.gitignore

@@ -0,0 +1,7 @@
+vendor/*
+!vendor/vendor.json
+coverage.out
+count.out
+test
+profile.out
+tmp.out

backend/vendor/github.com/gin-gonic/gin/.travis.yml

@@ -0,0 +1,44 @@
+language: go
+
+matrix:
+  fast_finish: true
+  include:
+  - go: 1.8.x
+  - go: 1.9.x
+  - go: 1.10.x
+  - go: 1.11.x
+    env: GO111MODULE=on
+  - go: 1.12.x
+    env: GO111MODULE=on
+  - go: master
+    env: GO111MODULE=on
+
+git:
+  depth: 10
+
+before_install:
+  - if [[ "${GO111MODULE}" = "on" ]]; then mkdir "${HOME}/go"; export GOPATH="${HOME}/go"; fi
+
+install:
+  - if [[ "${GO111MODULE}" = "on" ]]; then go mod download; else make install; fi
+  - if [[ "${GO111MODULE}" = "on" ]]; then export PATH="${GOPATH}/bin:${GOROOT}/bin:${PATH}"; fi
+  - if [[ "${GO111MODULE}" = "on" ]]; then make tools; fi
+
+go_import_path: github.com/gin-gonic/gin
+
+script:
+  - make vet
+  - make fmt-check
+  - make misspell-check
+  - make test
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash)
+
+notifications:
+  webhooks:
+    urls:
+      - https://webhooks.gitter.im/e/7f95bf605c4d356372f4
+    on_success: change  # options: [always|never|change] default: always
+    on_failure: always  # options: [always|never|change] default: always
+    on_start: false     # default: false

backend/vendor/github.com/gin-gonic/gin/AUTHORS.md

@@ -0,0 +1,231 @@
+List of all the awesome people working to make Gin the best Web Framework in Go.
+
+## gin 1.x series authors
+
+**Gin Core Team:** Bo-Yi Wu (@appleboy), 田欧 (@thinkerou), Javier Provecho (@javierprovecho)
+
+## gin 0.x series authors
+
+**Maintainers:** Manu Martinez-Almeida (@manucorporat), Javier Provecho (@javierprovecho)
+
+People and companies, who have contributed, in alphabetical order.
+
+**@858806258 (杰哥)**
+- Fix typo in example
+
+
+**@achedeuzot (Klemen Sever)**
+- Fix newline debug printing
+
+
+**@adammck (Adam Mckaig)**
+- Add MIT license
+
+
+**@AlexanderChen1989 (Alexander)**
+- Typos in README
+
+
+**@alexanderdidenko (Aleksandr Didenko)**
+- Add support multipart/form-data
+
+
+**@alexandernyquist (Alexander Nyquist)**
+- Using template.Must to fix multiple return issue
+- ★ Added support for OPTIONS verb
+- ★ Setting response headers before calling WriteHeader
+- Improved documentation for model binding
+- ★ Added Content.Redirect()
+- ★ Added tons of Unit tests
+
+
+**@austinheap (Austin Heap)**
+- Added travis CI integration
+
+
+**@andredublin (Andre Dublin)**
+- Fix typo in comment
+
+
+**@bredov (Ludwig Valda Vasquez)**
+- Fix html templating in debug mode
+
+
+**@bluele (Jun Kimura)**
+- Fixes code examples in README
+
+
+**@chad-russell**
+- ★ Support for serializing gin.H into XML
+
+
+**@dickeyxxx (Jeff Dickey)**
+- Typos in README
+- Add example about serving static files
+
+
+**@donileo (Adonis)**
+- Add NoMethod handler
+
+
+**@dutchcoders (DutchCoders)**
+- ★ Fix security bug that allows client to spoof ip
+- Fix typo. r.HTMLTemplates -> SetHTMLTemplate
+
+
+**@el3ctro- (Joshua Loper)**
+- Fix typo in example
+
+
+**@ethankan (Ethan Kan)**
+- Unsigned integers in binding
+
+
+**(Evgeny Persienko)**
+- Validate sub structures
+
+
+**@frankbille (Frank Bille)**
+- Add support for HTTP Realm Auth
+
+
+**@fmd (Fareed Dudhia)**
+- Fix typo. SetHTTPTemplate -> SetHTMLTemplate
+
+
+**@ironiridis (Christopher Harrington)**
+- Remove old reference
+
+
+**@jammie-stackhouse (Jamie Stackhouse)**
+- Add more shortcuts for router methods
+
+
+**@jasonrhansen**
+- Fix spelling and grammar errors in documentation
+
+
+**@JasonSoft (Jason Lee)**
+- Fix typo in comment
+
+
+**@joiggama (Ignacio Galindo)**
+- Add utf-8 charset header on renders
+
+
+**@julienschmidt (Julien Schmidt)**
+- gofmt the code examples
+
+
+**@kelcecil (Kel Cecil)**
+- Fix readme typo
+
+
+**@kyledinh (Kyle Dinh)**
+- Adds RunTLS()
+
+
+**@LinusU (Linus Unnebäck)**
+- Small fixes in README
+
+
+**@loongmxbt (Saint Asky)**
+- Fix typo in example
+
+
+**@lucas-clemente (Lucas Clemente)**
+- ★ work around path.Join removing trailing slashes from routes
+
+
+**@mattn (Yasuhiro Matsumoto)**
+- Improve color logger
+
+
+**@mdigger (Dmitry Sedykh)**
+- Fixes Form binding when content-type is x-www-form-urlencoded
+- No repeat call c.Writer.Status() in gin.Logger
+- Fixes Content-Type for json render
+
+
+**@mirzac (Mirza Ceric)**
+- Fix debug printing
+
+
+**@mopemope (Yutaka Matsubara)**
+- ★ Adds Godep support (Dependencies Manager)
+- Fix variadic parameter in the flexible render API
+- Fix Corrupted plain render
+- Add Pluggable View Renderer Example
+ 
+
+**@msemenistyi (Mykyta Semenistyi)**
+- update Readme.md. Add code to String method
+
+
+**@msoedov (Sasha Myasoedov)**
+- ★ Adds tons of unit tests.
+
+
+**@ngerakines (Nick Gerakines)**
+- ★ Improves API, c.GET() doesn't panic
+- Adds MustGet() method
+
+
+**@r8k (Rajiv Kilaparti)**
+- Fix Port usage in README.
+
+
+**@rayrod2030 (Ray Rodriguez)**
+- Fix typo in example
+
+
+**@rns**
+- Fix typo in example
+
+
+**@RobAWilkinson (Robert Wilkinson)**
+- Add example of forms and params
+
+
+**@rogierlommers (Rogier Lommers)**
+- Add updated static serve example
+
+
+**@se77en (Damon Zhao)**
+- Improve color logging
+
+
+**@silasb (Silas Baronda)**
+- Fixing quotes in README
+
+
+**@SkuliOskarsson (Skuli Oskarsson)**
+- Fixes some texts in README II
+
+
+**@slimmy (Jimmy Pettersson)**
+- Added messages for required bindings
+
+
+**@smira (Andrey Smirnov)**
+- Add support for ignored/unexported fields in binding
+
+
+**@superalsrk (SRK.Lyu)**
+- Update httprouter godeps
+
+
+**@tebeka (Miki Tebeka)**
+- Use net/http constants instead of numeric values
+
+
+**@techjanitor**
+- Update context.go reserved IPs
+
+
+**@yosssi (Keiji Yoshida)**
+- Fix link in README
+
+
+**@yuyabee**
+- Fixed README

backend/vendor/github.com/gin-gonic/gin/BENCHMARKS.md

@@ -0,0 +1,604 @@
+
+## Benchmark System
+
+**VM HOST:** DigitalOcean  
+**Machine:** 4 CPU, 8 GB RAM. Ubuntu 16.04.2 x64  
+**Date:** July 19th, 2017  
+**Go Version:** 1.8.3 linux/amd64  
+**Source:** [Go HTTP Router Benchmark](https://github.com/julienschmidt/go-http-routing-benchmark)  
+
+## Static Routes: 157
+
+```
+Gin:             30512 Bytes
+
+HttpServeMux:    17344 Bytes
+Ace:             30080 Bytes
+Bear:            30472 Bytes
+Beego:           96408 Bytes
+Bone:            37904 Bytes
+Denco:           10464 Bytes
+Echo:            73680 Bytes
+GocraftWeb:      55720 Bytes
+Goji:            27200 Bytes
+Gojiv2:         104464 Bytes
+GoJsonRest:     136472 Bytes
+GoRestful:      914904 Bytes
+GorillaMux:     675568 Bytes
+HttpRouter:      21128 Bytes
+HttpTreeMux:     73448 Bytes
+Kocha:          115072 Bytes
+LARS:            30120 Bytes
+Macaron:         37984 Bytes
+Martini:        310832 Bytes
+Pat:             20464 Bytes
+Possum:          91328 Bytes
+R2router:        23712 Bytes
+Rivet:           23880 Bytes
+Tango:           28008 Bytes
+TigerTonic:      80368 Bytes
+Traffic:        626480 Bytes
+Vulcan:         369064 Bytes
+```
+
+## GithubAPI Routes: 203
+
+```
+Gin:             52672 Bytes
+
+Ace:             48992 Bytes
+Bear:           161592 Bytes
+Beego:          147992 Bytes
+Bone:            97728 Bytes
+Denco:           36440 Bytes
+Echo:            95672 Bytes
+GocraftWeb:      95640 Bytes
+Goji:            86088 Bytes
+Gojiv2:         144392 Bytes
+GoJsonRest:     134648 Bytes
+GoRestful:     1410760 Bytes
+GorillaMux:    1509488 Bytes
+HttpRouter:      37464 Bytes
+HttpTreeMux:     78800 Bytes
+Kocha:          785408 Bytes
+LARS:            49032 Bytes
+Macaron:        132712 Bytes
+Martini:        564352 Bytes
+Pat:             21200 Bytes
+Possum:          83888 Bytes
+R2router:        47104 Bytes
+Rivet:           42840 Bytes
+Tango:           54584 Bytes
+TigerTonic:      96384 Bytes
+Traffic:       1061920 Bytes
+Vulcan:         465296 Bytes
+```
+
+## GPlusAPI Routes: 13
+
+```
+Gin:              3968 Bytes
+
+Ace:              3600 Bytes
+Bear:             7112 Bytes
+Beego:           10048 Bytes
+Bone:             6480 Bytes
+Denco:            3256 Bytes
+Echo:             9000 Bytes
+GocraftWeb:       7496 Bytes
+Goji:             2912 Bytes
+Gojiv2:           7376 Bytes
+GoJsonRest:      11544 Bytes
+GoRestful:       88776 Bytes
+GorillaMux:      71488 Bytes
+HttpRouter:       2712 Bytes
+HttpTreeMux:      7440 Bytes
+Kocha:          128880 Bytes
+LARS:             3640 Bytes
+Macaron:          8656 Bytes
+Martini:         23936 Bytes
+Pat:              1856 Bytes
+Possum:           7248 Bytes
+R2router:         3928 Bytes
+Rivet:            3064 Bytes
+Tango:            4912 Bytes
+TigerTonic:       9408 Bytes
+Traffic:         49472 Bytes
+Vulcan:          25496 Bytes
+```
+
+## ParseAPI Routes: 26
+
+```
+Gin:              6928 Bytes
+
+Ace:              6592 Bytes
+Bear:            12320 Bytes
+Beego:           18960 Bytes
+Bone:            11024 Bytes
+Denco:            4184 Bytes
+Echo:            11168 Bytes
+GocraftWeb:      12800 Bytes
+Goji:             5232 Bytes
+Gojiv2:          14464 Bytes
+GoJsonRest:      14216 Bytes
+GoRestful:      127368 Bytes
+GorillaMux:     123016 Bytes
+HttpRouter:       4976 Bytes
+HttpTreeMux:      7848 Bytes
+Kocha:          181712 Bytes
+LARS:             6632 Bytes
+Macaron:         13648 Bytes
+Martini:         45952 Bytes
+Pat:              2560 Bytes
+Possum:           9200 Bytes
+R2router:         7056 Bytes
+Rivet:            5680 Bytes
+Tango:            8664 Bytes
+TigerTonic:       9840 Bytes
+Traffic:         93480 Bytes
+Vulcan:          44504 Bytes
+```
+
+## Static Routes
+
+```
+BenchmarkGin_StaticAll                     50000             34506 ns/op               0 B/op          0 allocs/op
+
+BenchmarkAce_StaticAll                     30000             49657 ns/op               0 B/op          0 allocs/op
+BenchmarkHttpServeMux_StaticAll             2000           1183737 ns/op              96 B/op          8 allocs/op
+BenchmarkBeego_StaticAll                    5000            412621 ns/op           57776 B/op        628 allocs/op
+BenchmarkBear_StaticAll                    10000            149242 ns/op           20336 B/op        461 allocs/op
+BenchmarkBone_StaticAll                    10000            118583 ns/op               0 B/op          0 allocs/op
+BenchmarkDenco_StaticAll                  100000             13247 ns/op               0 B/op          0 allocs/op
+BenchmarkEcho_StaticAll                    20000             79914 ns/op            5024 B/op        157 allocs/op
+BenchmarkGocraftWeb_StaticAll              10000            211823 ns/op           46440 B/op        785 allocs/op
+BenchmarkGoji_StaticAll                    10000            109390 ns/op               0 B/op          0 allocs/op
+BenchmarkGojiv2_StaticAll                   3000            415533 ns/op          145696 B/op       1099 allocs/op
+BenchmarkGoJsonRest_StaticAll               5000            364403 ns/op           51653 B/op       1727 allocs/op
+BenchmarkGoRestful_StaticAll                 500           2578579 ns/op          314936 B/op       3144 allocs/op
+BenchmarkGorillaMux_StaticAll                500           2704856 ns/op          115648 B/op       1578 allocs/op
+BenchmarkHttpRouter_StaticAll             100000             18541 ns/op               0 B/op          0 allocs/op
+BenchmarkHttpTreeMux_StaticAll            100000             22332 ns/op               0 B/op          0 allocs/op
+BenchmarkKocha_StaticAll                   50000             31176 ns/op               0 B/op          0 allocs/op
+BenchmarkLARS_StaticAll                    50000             40840 ns/op               0 B/op          0 allocs/op
+BenchmarkMacaron_StaticAll                  5000            517656 ns/op          120576 B/op       1413 allocs/op
+BenchmarkMartini_StaticAll                   300           4462289 ns/op          125442 B/op       1717 allocs/op
+BenchmarkPat_StaticAll                       500           2157275 ns/op          533904 B/op      11123 allocs/op
+BenchmarkPossum_StaticAll                  10000            254701 ns/op           65312 B/op        471 allocs/op
+BenchmarkR2router_StaticAll                10000            133956 ns/op           22608 B/op        628 allocs/op
+BenchmarkRivet_StaticAll                   30000             46812 ns/op               0 B/op          0 allocs/op
+BenchmarkTango_StaticAll                    5000            390613 ns/op           39225 B/op       1256 allocs/op
+BenchmarkTigerTonic_StaticAll              20000             88060 ns/op            7504 B/op        157 allocs/op
+BenchmarkTraffic_StaticAll                   500           2910236 ns/op          729736 B/op      14287 allocs/op
+BenchmarkVulcan_StaticAll                   5000            277366 ns/op           15386 B/op        471 allocs/op
+```
+
+## Micro Benchmarks
+
+```
+BenchmarkGin_Param                      20000000               113 ns/op               0 B/op          0 allocs/op
+
+BenchmarkAce_Param                       5000000               375 ns/op              32 B/op          1 allocs/op
+BenchmarkBear_Param                      1000000              1709 ns/op             456 B/op          5 allocs/op
+BenchmarkBeego_Param                     1000000              2484 ns/op             368 B/op          4 allocs/op
+BenchmarkBone_Param                      1000000              2391 ns/op             688 B/op          5 allocs/op
+BenchmarkDenco_Param                    10000000               240 ns/op              32 B/op          1 allocs/op
+BenchmarkEcho_Param                      5000000               366 ns/op              32 B/op          1 allocs/op
+BenchmarkGocraftWeb_Param                1000000              2343 ns/op             648 B/op          8 allocs/op
+BenchmarkGoji_Param                      1000000              1197 ns/op             336 B/op          2 allocs/op
+BenchmarkGojiv2_Param                    1000000              2771 ns/op             944 B/op          8 allocs/op
+BenchmarkGoJsonRest_Param                1000000              2993 ns/op             649 B/op         13 allocs/op
+BenchmarkGoRestful_Param                  200000              8860 ns/op            2296 B/op         21 allocs/op
+BenchmarkGorillaMux_Param                 500000              4461 ns/op            1056 B/op         11 allocs/op
+BenchmarkHttpRouter_Param               10000000               175 ns/op              32 B/op          1 allocs/op
+BenchmarkHttpTreeMux_Param               1000000              1167 ns/op             352 B/op          3 allocs/op
+BenchmarkKocha_Param                     3000000               429 ns/op              56 B/op          3 allocs/op
+BenchmarkLARS_Param                     10000000               134 ns/op               0 B/op          0 allocs/op
+BenchmarkMacaron_Param                    500000              4635 ns/op            1056 B/op         10 allocs/op
+BenchmarkMartini_Param                    200000              9933 ns/op            1072 B/op         10 allocs/op
+BenchmarkPat_Param                       1000000              2929 ns/op             648 B/op         12 allocs/op
+BenchmarkPossum_Param                    1000000              2503 ns/op             560 B/op          6 allocs/op
+BenchmarkR2router_Param                  1000000              1507 ns/op             432 B/op          5 allocs/op
+BenchmarkRivet_Param                     5000000               297 ns/op              48 B/op          1 allocs/op
+BenchmarkTango_Param                     1000000              1862 ns/op             248 B/op          8 allocs/op
+BenchmarkTigerTonic_Param                 500000              5660 ns/op             992 B/op         17 allocs/op
+BenchmarkTraffic_Param                    200000              8408 ns/op            1960 B/op         21 allocs/op
+BenchmarkVulcan_Param                    2000000               963 ns/op              98 B/op          3 allocs/op
+BenchmarkAce_Param5                      2000000               740 ns/op             160 B/op          1 allocs/op
+BenchmarkBear_Param5                     1000000              2777 ns/op             501 B/op          5 allocs/op
+BenchmarkBeego_Param5                    1000000              3740 ns/op             368 B/op          4 allocs/op
+BenchmarkBone_Param5                     1000000              2950 ns/op             736 B/op          5 allocs/op
+BenchmarkDenco_Param5                    2000000               644 ns/op             160 B/op          1 allocs/op
+BenchmarkEcho_Param5                     3000000               558 ns/op              32 B/op          1 allocs/op
+BenchmarkGin_Param5                     10000000               198 ns/op               0 B/op          0 allocs/op
+BenchmarkGocraftWeb_Param5                500000              3870 ns/op             920 B/op         11 allocs/op
+BenchmarkGoji_Param5                     1000000              1746 ns/op             336 B/op          2 allocs/op
+BenchmarkGojiv2_Param5                   1000000              3214 ns/op            1008 B/op          8 allocs/op
+BenchmarkGoJsonRest_Param5                500000              5509 ns/op            1097 B/op         16 allocs/op
+BenchmarkGoRestful_Param5                 200000             11232 ns/op            2392 B/op         21 allocs/op
+BenchmarkGorillaMux_Param5                300000              7777 ns/op            1184 B/op         11 allocs/op
+BenchmarkHttpRouter_Param5               3000000               631 ns/op             160 B/op          1 allocs/op
+BenchmarkHttpTreeMux_Param5              1000000              2800 ns/op             576 B/op          6 allocs/op
+BenchmarkKocha_Param5                    1000000              2053 ns/op             440 B/op         10 allocs/op
+BenchmarkLARS_Param5                    10000000               232 ns/op               0 B/op          0 allocs/op
+BenchmarkMacaron_Param5                   500000              5888 ns/op            1056 B/op         10 allocs/op
+BenchmarkMartini_Param5                   200000             12807 ns/op            1232 B/op         11 allocs/op
+BenchmarkPat_Param5                       300000              7320 ns/op             964 B/op         32 allocs/op
+BenchmarkPossum_Param5                   1000000              2495 ns/op             560 B/op          6 allocs/op
+BenchmarkR2router_Param5                 1000000              1844 ns/op             432 B/op          5 allocs/op
+BenchmarkRivet_Param5                    2000000               935 ns/op             240 B/op          1 allocs/op
+BenchmarkTango_Param5                    1000000              2327 ns/op             360 B/op          8 allocs/op
+BenchmarkTigerTonic_Param5                100000             18514 ns/op            2551 B/op         43 allocs/op
+BenchmarkTraffic_Param5                   200000             11997 ns/op            2248 B/op         25 allocs/op
+BenchmarkVulcan_Param5                   1000000              1333 ns/op              98 B/op          3 allocs/op
+BenchmarkAce_Param20                     1000000              2031 ns/op             640 B/op          1 allocs/op
+BenchmarkBear_Param20                     200000              7285 ns/op            1664 B/op          5 allocs/op
+BenchmarkBeego_Param20                    300000              6224 ns/op             368 B/op          4 allocs/op
+BenchmarkBone_Param20                     200000              8023 ns/op            1903 B/op          5 allocs/op
+BenchmarkDenco_Param20                   1000000              2262 ns/op             640 B/op          1 allocs/op
+BenchmarkEcho_Param20                    1000000              1387 ns/op              32 B/op          1 allocs/op
+BenchmarkGin_Param20                     3000000               503 ns/op               0 B/op          0 allocs/op
+BenchmarkGocraftWeb_Param20               100000             14408 ns/op            3795 B/op         15 allocs/op
+BenchmarkGoji_Param20                     500000              5272 ns/op            1247 B/op          2 allocs/op
+BenchmarkGojiv2_Param20                  1000000              4163 ns/op            1248 B/op          8 allocs/op
+BenchmarkGoJsonRest_Param20               100000             17866 ns/op            4485 B/op         20 allocs/op
+BenchmarkGoRestful_Param20                100000             21022 ns/op            4724 B/op         23 allocs/op
+BenchmarkGorillaMux_Param20               100000             17055 ns/op            3547 B/op         13 allocs/op
+BenchmarkHttpRouter_Param20              1000000              1748 ns/op             640 B/op          1 allocs/op
+BenchmarkHttpTreeMux_Param20              200000             12246 ns/op            3196 B/op         10 allocs/op
+BenchmarkKocha_Param20                    300000              6861 ns/op            1808 B/op         27 allocs/op
+BenchmarkLARS_Param20                    3000000               526 ns/op               0 B/op          0 allocs/op
+BenchmarkMacaron_Param20                  100000             13069 ns/op            2906 B/op         12 allocs/op
+BenchmarkMartini_Param20                  100000             23602 ns/op            3597 B/op         13 allocs/op
+BenchmarkPat_Param20                       50000             32143 ns/op            4688 B/op        111 allocs/op
+BenchmarkPossum_Param20                  1000000              2396 ns/op             560 B/op          6 allocs/op
+BenchmarkR2router_Param20                 200000              8907 ns/op            2283 B/op          7 allocs/op
+BenchmarkRivet_Param20                   1000000              3280 ns/op            1024 B/op          1 allocs/op
+BenchmarkTango_Param20                    500000              4640 ns/op             856 B/op          8 allocs/op
+BenchmarkTigerTonic_Param20                20000             67581 ns/op           10532 B/op        138 allocs/op
+BenchmarkTraffic_Param20                   50000             40313 ns/op            7941 B/op         45 allocs/op
+BenchmarkVulcan_Param20                  1000000              2264 ns/op              98 B/op          3 allocs/op
+BenchmarkAce_ParamWrite                  3000000               532 ns/op              40 B/op          2 allocs/op
+BenchmarkBear_ParamWrite                 1000000              1778 ns/op             456 B/op          5 allocs/op
+BenchmarkBeego_ParamWrite                1000000              2596 ns/op             376 B/op          5 allocs/op
+BenchmarkBone_ParamWrite                 1000000              2519 ns/op             688 B/op          5 allocs/op
+BenchmarkDenco_ParamWrite                5000000               411 ns/op              32 B/op          1 allocs/op
+BenchmarkEcho_ParamWrite                 2000000               718 ns/op              40 B/op          2 allocs/op
+BenchmarkGin_ParamWrite                  5000000               283 ns/op               0 B/op          0 allocs/op
+BenchmarkGocraftWeb_ParamWrite           1000000              2561 ns/op             656 B/op          9 allocs/op
+BenchmarkGoji_ParamWrite                 1000000              1378 ns/op             336 B/op          2 allocs/op
+BenchmarkGojiv2_ParamWrite               1000000              3128 ns/op             976 B/op         10 allocs/op
+BenchmarkGoJsonRest_ParamWrite            500000              4446 ns/op            1128 B/op         18 allocs/op
+BenchmarkGoRestful_ParamWrite             200000             10291 ns/op            2304 B/op         22 allocs/op
+BenchmarkGorillaMux_ParamWrite            500000              5153 ns/op            1064 B/op         12 allocs/op
+BenchmarkHttpRouter_ParamWrite           5000000               263 ns/op              32 B/op          1 allocs/op
+BenchmarkHttpTreeMux_ParamWrite          1000000              1351 ns/op             352 B/op          3 allocs/op
+BenchmarkKocha_ParamWrite                3000000               538 ns/op              56 B/op          3 allocs/op
+BenchmarkLARS_ParamWrite                 5000000               316 ns/op               0 B/op          0 allocs/op
+BenchmarkMacaron_ParamWrite               500000              5756 ns/op            1160 B/op         14 allocs/op
+BenchmarkMartini_ParamWrite               200000             13097 ns/op            1176 B/op         14 allocs/op
+BenchmarkPat_ParamWrite                   500000              4954 ns/op            1072 B/op         17 allocs/op
+BenchmarkPossum_ParamWrite               1000000              2499 ns/op             560 B/op          6 allocs/op
+BenchmarkR2router_ParamWrite             1000000              1531 ns/op             432 B/op          5 allocs/op
+BenchmarkRivet_ParamWrite                3000000               570 ns/op             112 B/op          2 allocs/op
+BenchmarkTango_ParamWrite                2000000               957 ns/op             136 B/op          4 allocs/op
+BenchmarkTigerTonic_ParamWrite            200000              7025 ns/op            1424 B/op         23 allocs/op
+BenchmarkTraffic_ParamWrite               200000             10112 ns/op            2384 B/op         25 allocs/op
+BenchmarkVulcan_ParamWrite               1000000              1006 ns/op              98 B/op          3 allocs/op
+```
+
+## GitHub
+
+```
+BenchmarkGin_GithubStatic               10000000               156 ns/op               0 B/op          0 allocs/op
+
+BenchmarkAce_GithubStatic                5000000               294 ns/op               0 B/op          0 allocs/op
+BenchmarkBear_GithubStatic               2000000               893 ns/op             120 B/op          3 allocs/op
+BenchmarkBeego_GithubStatic              1000000              2491 ns/op             368 B/op          4 allocs/op
+BenchmarkBone_GithubStatic                 50000             25300 ns/op            2880 B/op         60 allocs/op
+BenchmarkDenco_GithubStatic             20000000                76.0 ns/op             0 B/op          0 allocs/op
+BenchmarkEcho_GithubStatic               2000000               516 ns/op              32 B/op          1 allocs/op
+BenchmarkGocraftWeb_GithubStatic         1000000              1448 ns/op             296 B/op          5 allocs/op
+BenchmarkGoji_GithubStatic               3000000               496 ns/op               0 B/op          0 allocs/op
+BenchmarkGojiv2_GithubStatic             1000000              2941 ns/op             928 B/op          7 allocs/op
+BenchmarkGoRestful_GithubStatic           100000             27256 ns/op            3224 B/op         22 allocs/op
+BenchmarkGoJsonRest_GithubStatic         1000000              2196 ns/op             329 B/op         11 allocs/op
+BenchmarkGorillaMux_GithubStatic           50000             31617 ns/op             736 B/op         10 allocs/op
+BenchmarkHttpRouter_GithubStatic        20000000                88.4 ns/op             0 B/op          0 allocs/op
+BenchmarkHttpTreeMux_GithubStatic       10000000               134 ns/op               0 B/op          0 allocs/op
+BenchmarkKocha_GithubStatic             20000000               113 ns/op               0 B/op          0 allocs/op
+BenchmarkLARS_GithubStatic              10000000               195 ns/op               0 B/op          0 allocs/op
+BenchmarkMacaron_GithubStatic             500000              3740 ns/op             768 B/op          9 allocs/op
+BenchmarkMartini_GithubStatic              50000             27673 ns/op             768 B/op          9 allocs/op
+BenchmarkPat_GithubStatic                 100000             19470 ns/op            3648 B/op         76 allocs/op
+BenchmarkPossum_GithubStatic             1000000              1729 ns/op             416 B/op          3 allocs/op
+BenchmarkR2router_GithubStatic           2000000               879 ns/op             144 B/op          4 allocs/op
+BenchmarkRivet_GithubStatic             10000000               231 ns/op               0 B/op          0 allocs/op
+BenchmarkTango_GithubStatic              1000000              2325 ns/op             248 B/op          8 allocs/op
+BenchmarkTigerTonic_GithubStatic         3000000               610 ns/op              48 B/op          1 allocs/op
+BenchmarkTraffic_GithubStatic              20000             62973 ns/op           18904 B/op        148 allocs/op
+BenchmarkVulcan_GithubStatic             1000000              1447 ns/op              98 B/op          3 allocs/op
+BenchmarkAce_GithubParam                 2000000               686 ns/op              96 B/op          1 allocs/op
+BenchmarkBear_GithubParam                1000000              2155 ns/op             496 B/op          5 allocs/op
+BenchmarkBeego_GithubParam               1000000              2713 ns/op             368 B/op          4 allocs/op
+BenchmarkBone_GithubParam                 100000             15088 ns/op            1760 B/op         18 allocs/op
+BenchmarkDenco_GithubParam               2000000               629 ns/op             128 B/op          1 allocs/op
+BenchmarkEcho_GithubParam                2000000               653 ns/op              32 B/op          1 allocs/op
+BenchmarkGin_GithubParam                 5000000               255 ns/op               0 B/op          0 allocs/op
+BenchmarkGocraftWeb_GithubParam          1000000              3145 ns/op             712 B/op          9 allocs/op
+BenchmarkGoji_GithubParam                1000000              1916 ns/op             336 B/op          2 allocs/op
+BenchmarkGojiv2_GithubParam              1000000              3975 ns/op            1024 B/op         10 allocs/op
+BenchmarkGoJsonRest_GithubParam           300000              4134 ns/op             713 B/op         14 allocs/op
+BenchmarkGoRestful_GithubParam             50000             30782 ns/op            2360 B/op         21 allocs/op
+BenchmarkGorillaMux_GithubParam           100000             17148 ns/op            1088 B/op         11 allocs/op
+BenchmarkHttpRouter_GithubParam          3000000               523 ns/op              96 B/op          1 allocs/op
+BenchmarkHttpTreeMux_GithubParam         1000000              1671 ns/op             384 B/op          4 allocs/op
+BenchmarkKocha_GithubParam               1000000              1021 ns/op             128 B/op          5 allocs/op
+BenchmarkLARS_GithubParam                5000000               283 ns/op               0 B/op          0 allocs/op
+BenchmarkMacaron_GithubParam              500000              4270 ns/op            1056 B/op         10 allocs/op
+BenchmarkMartini_GithubParam              100000             21728 ns/op            1152 B/op         11 allocs/op
+BenchmarkPat_GithubParam                  200000             11208 ns/op            2464 B/op         48 allocs/op
+BenchmarkPossum_GithubParam              1000000              2334 ns/op             560 B/op          6 allocs/op
+BenchmarkR2router_GithubParam            1000000              1487 ns/op             432 B/op          5 allocs/op
+BenchmarkRivet_GithubParam               2000000               782 ns/op              96 B/op          1 allocs/op
+BenchmarkTango_GithubParam               1000000              2653 ns/op             344 B/op          8 allocs/op
+BenchmarkTigerTonic_GithubParam           300000             14073 ns/op            1440 B/op         24 allocs/op
+BenchmarkTraffic_GithubParam               50000             29164 ns/op            5992 B/op         52 allocs/op
+BenchmarkVulcan_GithubParam              1000000              2529 ns/op              98 B/op          3 allocs/op
+BenchmarkAce_GithubAll                     10000            134059 ns/op           13792 B/op        167 allocs/op
+BenchmarkBear_GithubAll                     5000            534445 ns/op           86448 B/op        943 allocs/op
+BenchmarkBeego_GithubAll                    3000            592444 ns/op           74705 B/op        812 allocs/op
+BenchmarkBone_GithubAll                      200           6957308 ns/op          698784 B/op       8453 allocs/op
+BenchmarkDenco_GithubAll                   10000            158819 ns/op           20224 B/op        167 allocs/op
+BenchmarkEcho_GithubAll                    10000            154700 ns/op            6496 B/op        203 allocs/op
+BenchmarkGin_GithubAll                     30000             48375 ns/op               0 B/op          0 allocs/op
+BenchmarkGocraftWeb_GithubAll               3000            570806 ns/op          131656 B/op       1686 allocs/op
+BenchmarkGoji_GithubAll                     2000            818034 ns/op           56112 B/op        334 allocs/op
+BenchmarkGojiv2_GithubAll                   2000           1213973 ns/op          274768 B/op       3712 allocs/op
+BenchmarkGoJsonRest_GithubAll               2000            785796 ns/op          134371 B/op       2737 allocs/op
+BenchmarkGoRestful_GithubAll                 300           5238188 ns/op          689672 B/op       4519 allocs/op
+BenchmarkGorillaMux_GithubAll                100          10257726 ns/op          211840 B/op       2272 allocs/op
+BenchmarkHttpRouter_GithubAll              20000            105414 ns/op           13792 B/op        167 allocs/op
+BenchmarkHttpTreeMux_GithubAll             10000            319934 ns/op           65856 B/op        671 allocs/op
+BenchmarkKocha_GithubAll                   10000            209442 ns/op           23304 B/op        843 allocs/op
+BenchmarkLARS_GithubAll                    20000             62565 ns/op               0 B/op          0 allocs/op
+BenchmarkMacaron_GithubAll                  2000           1161270 ns/op          204194 B/op       2000 allocs/op
+BenchmarkMartini_GithubAll                   200           9991713 ns/op          226549 B/op       2325 allocs/op
+BenchmarkPat_GithubAll                       200           5590793 ns/op         1499568 B/op      27435 allocs/op
+BenchmarkPossum_GithubAll                  10000            319768 ns/op           84448 B/op        609 allocs/op
+BenchmarkR2router_GithubAll                10000            305134 ns/op           77328 B/op        979 allocs/op
+BenchmarkRivet_GithubAll                   10000            132134 ns/op           16272 B/op        167 allocs/op
+BenchmarkTango_GithubAll                    3000            552754 ns/op           63826 B/op       1618 allocs/op
+BenchmarkTigerTonic_GithubAll               1000           1439483 ns/op          239104 B/op       5374 allocs/op
+BenchmarkTraffic_GithubAll                   100          11383067 ns/op         2659329 B/op      21848 allocs/op
+BenchmarkVulcan_GithubAll                   5000            394253 ns/op           19894 B/op        609 allocs/op
+```
+
+## Google+
+
+```
+BenchmarkGin_GPlusStatic                10000000               183 ns/op               0 B/op          0 allocs/op
+
+BenchmarkAce_GPlusStatic                 5000000               276 ns/op               0 B/op          0 allocs/op
+BenchmarkBear_GPlusStatic                2000000               652 ns/op             104 B/op          3 allocs/op
+BenchmarkBeego_GPlusStatic               1000000              2239 ns/op             368 B/op          4 allocs/op
+BenchmarkBone_GPlusStatic                5000000               380 ns/op              32 B/op          1 allocs/op
+BenchmarkDenco_GPlusStatic              30000000                45.8 ns/op             0 B/op          0 allocs/op
+BenchmarkEcho_GPlusStatic                5000000               338 ns/op              32 B/op          1 allocs/op
+BenchmarkGocraftWeb_GPlusStatic          1000000              1158 ns/op             280 B/op          5 allocs/op
+BenchmarkGoji_GPlusStatic                5000000               331 ns/op               0 B/op          0 allocs/op
+BenchmarkGojiv2_GPlusStatic              1000000              2106 ns/op             928 B/op          7 allocs/op
+BenchmarkGoJsonRest_GPlusStatic          1000000              1626 ns/op             329 B/op         11 allocs/op
+BenchmarkGoRestful_GPlusStatic            300000              7598 ns/op            1976 B/op         20 allocs/op
+BenchmarkGorillaMux_GPlusStatic          1000000              2629 ns/op             736 B/op         10 allocs/op
+BenchmarkHttpRouter_GPlusStatic         30000000                52.5 ns/op             0 B/op          0 allocs/op
+BenchmarkHttpTreeMux_GPlusStatic        20000000                85.8 ns/op             0 B/op          0 allocs/op
+BenchmarkKocha_GPlusStatic              20000000                89.2 ns/op             0 B/op          0 allocs/op
+BenchmarkLARS_GPlusStatic               10000000               162 ns/op               0 B/op          0 allocs/op
+BenchmarkMacaron_GPlusStatic              500000              3479 ns/op             768 B/op          9 allocs/op
+BenchmarkMartini_GPlusStatic              200000              9092 ns/op             768 B/op          9 allocs/op
+BenchmarkPat_GPlusStatic                 3000000               493 ns/op              96 B/op          2 allocs/op
+BenchmarkPossum_GPlusStatic              1000000              1467 ns/op             416 B/op          3 allocs/op
+BenchmarkR2router_GPlusStatic            2000000               788 ns/op             144 B/op          4 allocs/op
+BenchmarkRivet_GPlusStatic              20000000               114 ns/op               0 B/op          0 allocs/op
+BenchmarkTango_GPlusStatic               1000000              1534 ns/op             200 B/op          8 allocs/op
+BenchmarkTigerTonic_GPlusStatic          5000000               282 ns/op              32 B/op          1 allocs/op
+BenchmarkTraffic_GPlusStatic              500000              3798 ns/op            1192 B/op         15 allocs/op
+BenchmarkVulcan_GPlusStatic              2000000              1125 ns/op              98 B/op          3 allocs/op
+BenchmarkAce_GPlusParam                  3000000               528 ns/op              64 B/op          1 allocs/op
+BenchmarkBear_GPlusParam                 1000000              1570 ns/op             480 B/op          5 allocs/op
+BenchmarkBeego_GPlusParam                1000000              2369 ns/op             368 B/op          4 allocs/op
+BenchmarkBone_GPlusParam                 1000000              2028 ns/op             688 B/op          5 allocs/op
+BenchmarkDenco_GPlusParam                5000000               385 ns/op              64 B/op          1 allocs/op
+BenchmarkEcho_GPlusParam                 3000000               441 ns/op              32 B/op          1 allocs/op
+BenchmarkGin_GPlusParam                 10000000               174 ns/op               0 B/op          0 allocs/op
+BenchmarkGocraftWeb_GPlusParam           1000000              2033 ns/op             648 B/op          8 allocs/op
+BenchmarkGoji_GPlusParam                 1000000              1399 ns/op             336 B/op          2 allocs/op
+BenchmarkGojiv2_GPlusParam               1000000              2641 ns/op             944 B/op          8 allocs/op
+BenchmarkGoJsonRest_GPlusParam           1000000              2824 ns/op             649 B/op         13 allocs/op
+BenchmarkGoRestful_GPlusParam             200000              8875 ns/op            2296 B/op         21 allocs/op
+BenchmarkGorillaMux_GPlusParam            200000              6291 ns/op            1056 B/op         11 allocs/op
+BenchmarkHttpRouter_GPlusParam           5000000               316 ns/op              64 B/op          1 allocs/op
+BenchmarkHttpTreeMux_GPlusParam          1000000              1129 ns/op             352 B/op          3 allocs/op
+BenchmarkKocha_GPlusParam                3000000               538 ns/op              56 B/op          3 allocs/op
+BenchmarkLARS_GPlusParam                10000000               198 ns/op               0 B/op          0 allocs/op
+BenchmarkMacaron_GPlusParam               500000              3554 ns/op            1056 B/op         10 allocs/op
+BenchmarkMartini_GPlusParam               200000              9831 ns/op            1072 B/op         10 allocs/op
+BenchmarkPat_GPlusParam                  1000000              2706 ns/op             688 B/op         12 allocs/op
+BenchmarkPossum_GPlusParam               1000000              2297 ns/op             560 B/op          6 allocs/op
+BenchmarkR2router_GPlusParam             1000000              1318 ns/op             432 B/op          5 allocs/op
+BenchmarkRivet_GPlusParam                5000000               399 ns/op              48 B/op          1 allocs/op
+BenchmarkTango_GPlusParam                1000000              2070 ns/op             264 B/op          8 allocs/op
+BenchmarkTigerTonic_GPlusParam            500000              4853 ns/op            1056 B/op         17 allocs/op
+BenchmarkTraffic_GPlusParam               200000              8278 ns/op            1976 B/op         21 allocs/op
+BenchmarkVulcan_GPlusParam               1000000              1243 ns/op              98 B/op          3 allocs/op
+BenchmarkAce_GPlus2Params                3000000               549 ns/op              64 B/op          1 allocs/op
+BenchmarkBear_GPlus2Params               1000000              2112 ns/op             496 B/op          5 allocs/op
+BenchmarkBeego_GPlus2Params               500000              2750 ns/op             368 B/op          4 allocs/op
+BenchmarkBone_GPlus2Params                300000              7032 ns/op            1040 B/op          9 allocs/op
+BenchmarkDenco_GPlus2Params              3000000               502 ns/op              64 B/op          1 allocs/op
+BenchmarkEcho_GPlus2Params               3000000               641 ns/op              32 B/op          1 allocs/op
+BenchmarkGin_GPlus2Params                5000000               250 ns/op               0 B/op          0 allocs/op
+BenchmarkGocraftWeb_GPlus2Params         1000000              2681 ns/op             712 B/op          9 allocs/op
+BenchmarkGoji_GPlus2Params               1000000              1926 ns/op             336 B/op          2 allocs/op
+BenchmarkGojiv2_GPlus2Params              500000              3996 ns/op            1024 B/op         11 allocs/op
+BenchmarkGoJsonRest_GPlus2Params          500000              3886 ns/op             713 B/op         14 allocs/op
+BenchmarkGoRestful_GPlus2Params           200000             10376 ns/op            2360 B/op         21 allocs/op
+BenchmarkGorillaMux_GPlus2Params          100000             14162 ns/op            1088 B/op         11 allocs/op
+BenchmarkHttpRouter_GPlus2Params         5000000               336 ns/op              64 B/op          1 allocs/op
+BenchmarkHttpTreeMux_GPlus2Params        1000000              1523 ns/op             384 B/op          4 allocs/op
+BenchmarkKocha_GPlus2Params              2000000               970 ns/op             128 B/op          5 allocs/op
+BenchmarkLARS_GPlus2Params               5000000               238 ns/op               0 B/op          0 allocs/op
+BenchmarkMacaron_GPlus2Params             500000              4016 ns/op            1056 B/op         10 allocs/op
+BenchmarkMartini_GPlus2Params             100000             21253 ns/op            1200 B/op         13 allocs/op
+BenchmarkPat_GPlus2Params                 200000              8632 ns/op            2256 B/op         34 allocs/op
+BenchmarkPossum_GPlus2Params             1000000              2171 ns/op             560 B/op          6 allocs/op
+BenchmarkR2router_GPlus2Params           1000000              1340 ns/op             432 B/op          5 allocs/op
+BenchmarkRivet_GPlus2Params              3000000               557 ns/op              96 B/op          1 allocs/op
+BenchmarkTango_GPlus2Params              1000000              2186 ns/op             344 B/op          8 allocs/op
+BenchmarkTigerTonic_GPlus2Params          200000              9060 ns/op            1488 B/op         24 allocs/op
+BenchmarkTraffic_GPlus2Params             100000             20324 ns/op            3272 B/op         31 allocs/op
+BenchmarkVulcan_GPlus2Params             1000000              2039 ns/op              98 B/op          3 allocs/op
+BenchmarkAce_GPlusAll                     300000              6603 ns/op             640 B/op         11 allocs/op
+BenchmarkBear_GPlusAll                    100000             22363 ns/op            5488 B/op         61 allocs/op
+BenchmarkBeego_GPlusAll                    50000             38757 ns/op            4784 B/op         52 allocs/op
+BenchmarkBone_GPlusAll                     20000             54916 ns/op           10336 B/op         98 allocs/op
+BenchmarkDenco_GPlusAll                   300000              4959 ns/op             672 B/op         11 allocs/op
+BenchmarkEcho_GPlusAll                    200000              6558 ns/op             416 B/op         13 allocs/op
+BenchmarkGin_GPlusAll                     500000              2757 ns/op               0 B/op          0 allocs/op
+BenchmarkGocraftWeb_GPlusAll               50000             34615 ns/op            8040 B/op        103 allocs/op
+BenchmarkGoji_GPlusAll                    100000             16002 ns/op            3696 B/op         22 allocs/op
+BenchmarkGojiv2_GPlusAll                   50000             35060 ns/op           12624 B/op        115 allocs/op
+BenchmarkGoJsonRest_GPlusAll               50000             41479 ns/op            8117 B/op        170 allocs/op
+BenchmarkGoRestful_GPlusAll                10000            131653 ns/op           32024 B/op        275 allocs/op
+BenchmarkGorillaMux_GPlusAll               10000            101380 ns/op           13296 B/op        142 allocs/op
+BenchmarkHttpRouter_GPlusAll              500000              3711 ns/op             640 B/op         11 allocs/op
+BenchmarkHttpTreeMux_GPlusAll             100000             14438 ns/op            4032 B/op         38 allocs/op
+BenchmarkKocha_GPlusAll                   200000              8039 ns/op             976 B/op         43 allocs/op
+BenchmarkLARS_GPlusAll                    500000              2630 ns/op               0 B/op          0 allocs/op
+BenchmarkMacaron_GPlusAll                  30000             51123 ns/op           13152 B/op        128 allocs/op
+BenchmarkMartini_GPlusAll                  10000            176157 ns/op           14016 B/op        145 allocs/op
+BenchmarkPat_GPlusAll                      20000             69911 ns/op           16576 B/op        298 allocs/op
+BenchmarkPossum_GPlusAll                  100000             20716 ns/op            5408 B/op         39 allocs/op
+BenchmarkR2router_GPlusAll                100000             17463 ns/op            5040 B/op         63 allocs/op
+BenchmarkRivet_GPlusAll                   300000              5142 ns/op             768 B/op         11 allocs/op
+BenchmarkTango_GPlusAll                    50000             27321 ns/op            3656 B/op        104 allocs/op
+BenchmarkTigerTonic_GPlusAll               20000             77597 ns/op           14512 B/op        288 allocs/op
+BenchmarkTraffic_GPlusAll                  10000            151406 ns/op           37360 B/op        392 allocs/op
+BenchmarkVulcan_GPlusAll                  100000             18555 ns/op            1274 B/op         39 allocs/op
+```
+
+## Parse.com
+
+```
+BenchmarkGin_ParseStatic                10000000               133 ns/op               0 B/op          0 allocs/op
+
+BenchmarkAce_ParseStatic                 5000000               241 ns/op               0 B/op          0 allocs/op
+BenchmarkBear_ParseStatic                2000000               728 ns/op             120 B/op          3 allocs/op
+BenchmarkBeego_ParseStatic               1000000              2623 ns/op             368 B/op          4 allocs/op
+BenchmarkBone_ParseStatic                1000000              1285 ns/op             144 B/op          3 allocs/op
+BenchmarkDenco_ParseStatic              30000000                57.8 ns/op             0 B/op          0 allocs/op
+BenchmarkEcho_ParseStatic                5000000               342 ns/op              32 B/op          1 allocs/op
+BenchmarkGocraftWeb_ParseStatic          1000000              1478 ns/op             296 B/op          5 allocs/op
+BenchmarkGoji_ParseStatic                3000000               415 ns/op               0 B/op          0 allocs/op
+BenchmarkGojiv2_ParseStatic              1000000              2087 ns/op             928 B/op          7 allocs/op
+BenchmarkGoJsonRest_ParseStatic          1000000              1712 ns/op             329 B/op         11 allocs/op
+BenchmarkGoRestful_ParseStatic            200000             11072 ns/op            3224 B/op         22 allocs/op
+BenchmarkGorillaMux_ParseStatic           500000              4129 ns/op             752 B/op         11 allocs/op
+BenchmarkHttpRouter_ParseStatic         30000000                52.4 ns/op             0 B/op          0 allocs/op
+BenchmarkHttpTreeMux_ParseStatic        20000000               109 ns/op               0 B/op          0 allocs/op
+BenchmarkKocha_ParseStatic              20000000                81.8 ns/op             0 B/op          0 allocs/op
+BenchmarkLARS_ParseStatic               10000000               150 ns/op               0 B/op          0 allocs/op
+BenchmarkMacaron_ParseStatic             1000000              3288 ns/op             768 B/op          9 allocs/op
+BenchmarkMartini_ParseStatic              200000              9110 ns/op             768 B/op          9 allocs/op
+BenchmarkPat_ParseStatic                 1000000              1135 ns/op             240 B/op          5 allocs/op
+BenchmarkPossum_ParseStatic              1000000              1557 ns/op             416 B/op          3 allocs/op
+BenchmarkR2router_ParseStatic            2000000               730 ns/op             144 B/op          4 allocs/op
+BenchmarkRivet_ParseStatic              10000000               121 ns/op               0 B/op          0 allocs/op
+BenchmarkTango_ParseStatic               1000000              1688 ns/op             248 B/op          8 allocs/op
+BenchmarkTigerTonic_ParseStatic          3000000               427 ns/op              48 B/op          1 allocs/op
+BenchmarkTraffic_ParseStatic              500000              5962 ns/op            1816 B/op         20 allocs/op
+BenchmarkVulcan_ParseStatic              2000000               969 ns/op              98 B/op          3 allocs/op
+BenchmarkAce_ParseParam                  3000000               497 ns/op              64 B/op          1 allocs/op
+BenchmarkBear_ParseParam                 1000000              1473 ns/op             467 B/op          5 allocs/op
+BenchmarkBeego_ParseParam                1000000              2384 ns/op             368 B/op          4 allocs/op
+BenchmarkBone_ParseParam                 1000000              2513 ns/op             768 B/op          6 allocs/op
+BenchmarkDenco_ParseParam                5000000               364 ns/op              64 B/op          1 allocs/op
+BenchmarkEcho_ParseParam                 5000000               418 ns/op              32 B/op          1 allocs/op
+BenchmarkGin_ParseParam                 10000000               163 ns/op               0 B/op          0 allocs/op
+BenchmarkGocraftWeb_ParseParam           1000000              2361 ns/op             664 B/op          8 allocs/op
+BenchmarkGoji_ParseParam                 1000000              1590 ns/op             336 B/op          2 allocs/op
+BenchmarkGojiv2_ParseParam               1000000              2851 ns/op             976 B/op          9 allocs/op
+BenchmarkGoJsonRest_ParseParam           1000000              2965 ns/op             649 B/op         13 allocs/op
+BenchmarkGoRestful_ParseParam             200000             12207 ns/op            3544 B/op         23 allocs/op
+BenchmarkGorillaMux_ParseParam            500000              5187 ns/op            1088 B/op         12 allocs/op
+BenchmarkHttpRouter_ParseParam           5000000               275 ns/op              64 B/op          1 allocs/op
+BenchmarkHttpTreeMux_ParseParam          1000000              1108 ns/op             352 B/op          3 allocs/op
+BenchmarkKocha_ParseParam                3000000               495 ns/op              56 B/op          3 allocs/op
+BenchmarkLARS_ParseParam                10000000               192 ns/op               0 B/op          0 allocs/op
+BenchmarkMacaron_ParseParam               500000              4103 ns/op            1056 B/op         10 allocs/op
+BenchmarkMartini_ParseParam               200000              9878 ns/op            1072 B/op         10 allocs/op
+BenchmarkPat_ParseParam                   500000              3657 ns/op            1120 B/op         17 allocs/op
+BenchmarkPossum_ParseParam               1000000              2084 ns/op             560 B/op          6 allocs/op
+BenchmarkR2router_ParseParam             1000000              1251 ns/op             432 B/op          5 allocs/op
+BenchmarkRivet_ParseParam                5000000               335 ns/op              48 B/op          1 allocs/op
+BenchmarkTango_ParseParam                1000000              1854 ns/op             280 B/op          8 allocs/op
+BenchmarkTigerTonic_ParseParam            500000              4582 ns/op            1008 B/op         17 allocs/op
+BenchmarkTraffic_ParseParam               200000              8125 ns/op            2248 B/op         23 allocs/op
+BenchmarkVulcan_ParseParam               1000000              1148 ns/op              98 B/op          3 allocs/op
+BenchmarkAce_Parse2Params                3000000               539 ns/op              64 B/op          1 allocs/op
+BenchmarkBear_Parse2Params               1000000              1778 ns/op             496 B/op          5 allocs/op
+BenchmarkBeego_Parse2Params              1000000              2519 ns/op             368 B/op          4 allocs/op
+BenchmarkBone_Parse2Params               1000000              2596 ns/op             720 B/op          5 allocs/op
+BenchmarkDenco_Parse2Params              3000000               492 ns/op              64 B/op          1 allocs/op
+BenchmarkEcho_Parse2Params               3000000               484 ns/op              32 B/op          1 allocs/op
+BenchmarkGin_Parse2Params               10000000               193 ns/op               0 B/op          0 allocs/op
+BenchmarkGocraftWeb_Parse2Params         1000000              2575 ns/op             712 B/op          9 allocs/op
+BenchmarkGoji_Parse2Params               1000000              1373 ns/op             336 B/op          2 allocs/op
+BenchmarkGojiv2_Parse2Params              500000              2416 ns/op             960 B/op          8 allocs/op
+BenchmarkGoJsonRest_Parse2Params          300000              3452 ns/op             713 B/op         14 allocs/op
+BenchmarkGoRestful_Parse2Params           100000             17719 ns/op            6008 B/op         25 allocs/op
+BenchmarkGorillaMux_Parse2Params          300000              5102 ns/op            1088 B/op         11 allocs/op
+BenchmarkHttpRouter_Parse2Params         5000000               303 ns/op              64 B/op          1 allocs/op
+BenchmarkHttpTreeMux_Parse2Params        1000000              1372 ns/op             384 B/op          4 allocs/op
+BenchmarkKocha_Parse2Params              2000000               874 ns/op             128 B/op          5 allocs/op
+BenchmarkLARS_Parse2Params              10000000               192 ns/op               0 B/op          0 allocs/op
+BenchmarkMacaron_Parse2Params             500000              3871 ns/op            1056 B/op         10 allocs/op
+BenchmarkMartini_Parse2Params             200000              9954 ns/op            1152 B/op         11 allocs/op
+BenchmarkPat_Parse2Params                 500000              4194 ns/op             832 B/op         17 allocs/op
+BenchmarkPossum_Parse2Params             1000000              2121 ns/op             560 B/op          6 allocs/op
+BenchmarkR2router_Parse2Params           1000000              1415 ns/op             432 B/op          5 allocs/op
+BenchmarkRivet_Parse2Params              3000000               457 ns/op              96 B/op          1 allocs/op
+BenchmarkTango_Parse2Params              1000000              1914 ns/op             312 B/op          8 allocs/op
+BenchmarkTigerTonic_Parse2Params          300000              6895 ns/op            1408 B/op         24 allocs/op
+BenchmarkTraffic_Parse2Params             200000              8317 ns/op            2040 B/op         22 allocs/op
+BenchmarkVulcan_Parse2Params             1000000              1274 ns/op              98 B/op          3 allocs/op
+BenchmarkAce_ParseAll                     200000             10401 ns/op             640 B/op         16 allocs/op
+BenchmarkBear_ParseAll                     50000             37743 ns/op            8928 B/op        110 allocs/op
+BenchmarkBeego_ParseAll                    20000             63193 ns/op            9568 B/op        104 allocs/op
+BenchmarkBone_ParseAll                     20000             61767 ns/op           14160 B/op        131 allocs/op
+BenchmarkDenco_ParseAll                   300000              7036 ns/op             928 B/op         16 allocs/op
+BenchmarkEcho_ParseAll                    200000             11824 ns/op             832 B/op         26 allocs/op
+BenchmarkGin_ParseAll                     300000              4199 ns/op               0 B/op          0 allocs/op
+BenchmarkGocraftWeb_ParseAll               30000             51758 ns/op           13728 B/op        181 allocs/op
+BenchmarkGoji_ParseAll                     50000             29614 ns/op            5376 B/op         32 allocs/op
+BenchmarkGojiv2_ParseAll                   20000             68676 ns/op           24464 B/op        199 allocs/op
+BenchmarkGoJsonRest_ParseAll               20000             76135 ns/op           13866 B/op        321 allocs/op
+BenchmarkGoRestful_ParseAll                 5000            389487 ns/op          110928 B/op        600 allocs/op
+BenchmarkGorillaMux_ParseAll               10000            221250 ns/op           24864 B/op        292 allocs/op
+BenchmarkHttpRouter_ParseAll              200000              6444 ns/op             640 B/op         16 allocs/op
+BenchmarkHttpTreeMux_ParseAll              50000             30702 ns/op            5728 B/op         51 allocs/op
+BenchmarkKocha_ParseAll                   200000             13712 ns/op            1112 B/op         54 allocs/op
+BenchmarkLARS_ParseAll                    300000              6925 ns/op               0 B/op          0 allocs/op
+BenchmarkMacaron_ParseAll                  20000             96278 ns/op           24576 B/op        250 allocs/op
+BenchmarkMartini_ParseAll                   5000            271352 ns/op           25072 B/op        253 allocs/op
+BenchmarkPat_ParseAll                      20000             74941 ns/op           17264 B/op        343 allocs/op
+BenchmarkPossum_ParseAll                   50000             39947 ns/op           10816 B/op         78 allocs/op
+BenchmarkR2router_ParseAll                 50000             42479 ns/op            8352 B/op        120 allocs/op
+BenchmarkRivet_ParseAll                   200000              7726 ns/op             912 B/op         16 allocs/op
+BenchmarkTango_ParseAll                    30000             50014 ns/op            7168 B/op        208 allocs/op
+BenchmarkTigerTonic_ParseAll               10000            106550 ns/op           19728 B/op        379 allocs/op
+BenchmarkTraffic_ParseAll                  10000            216037 ns/op           57776 B/op        642 allocs/op
+BenchmarkVulcan_ParseAll                   50000             34379 ns/op            2548 B/op         78 allocs/op
+```

backend/vendor/github.com/gin-gonic/gin/CHANGELOG.md

@@ -0,0 +1,269 @@
+
+### Gin 1.4.0
+
+- [NEW] Support for [Go Modules](https://github.com/golang/go/wiki/Modules)  [#1569](https://github.com/gin-gonic/gin/pull/1569)
+- [NEW] Refactor of form mapping multipart requesta [#1829](https://github.com/gin-gonic/gin/pull/1829)
+- [FIX] Truncate Latency precision in long running request [#1830](https://github.com/gin-gonic/gin/pull/1830)
+- [FIX] IsTerm flag should not be affected by DisableConsoleColor method. [#1802](https://github.com/gin-gonic/gin/pull/1802)
+- [NEW] Supporting file binding [#1264](https://github.com/gin-gonic/gin/pull/1264)
+- [NEW] Add support for mapping arrays [#1797](https://github.com/gin-gonic/gin/pull/1797)
+- [FIX] Readme updates [#1793](https://github.com/gin-gonic/gin/pull/1793) [#1788](https://github.com/gin-gonic/gin/pull/1788) [1789](https://github.com/gin-gonic/gin/pull/1789)
+- [FIX] StaticFS: Fixed Logging two log lines on 404.  [#1805](https://github.com/gin-gonic/gin/pull/1805), [#1804](https://github.com/gin-gonic/gin/pull/1804)
+- [NEW] Make context.Keys available as LogFormatterParams [#1779](https://github.com/gin-gonic/gin/pull/1779)
+- [NEW] Use internal/json for Marshal/Unmarshal [#1791](https://github.com/gin-gonic/gin/pull/1791)
+- [NEW] Support mapping time.Duration [#1794](https://github.com/gin-gonic/gin/pull/1794)
+- [NEW] Refactor form mappings [#1749](https://github.com/gin-gonic/gin/pull/1749)
+- [NEW] Added flag to context.Stream indicates if client disconnected in middle of stream [#1252](https://github.com/gin-gonic/gin/pull/1252)
+- [FIX] Moved [examples](https://github.com/gin-gonic/examples) to stand alone Repo [#1775](https://github.com/gin-gonic/gin/pull/1775)
+- [NEW] Extend context.File to allow for the content-dispositon attachments via a new method context.Attachment [#1260](https://github.com/gin-gonic/gin/pull/1260)
+- [FIX] Support HTTP content negotiation wildcards [#1112](https://github.com/gin-gonic/gin/pull/1112)
+- [NEW] Add prefix from X-Forwarded-Prefix in redirectTrailingSlash [#1238](https://github.com/gin-gonic/gin/pull/1238)
+- [FIX] context.Copy() race condition [#1020](https://github.com/gin-gonic/gin/pull/1020)
+- [NEW] Add context.HandlerNames() [#1729](https://github.com/gin-gonic/gin/pull/1729)
+- [FIX] Change color methods to public in the defaultLogger. [#1771](https://github.com/gin-gonic/gin/pull/1771)
+- [FIX] Update writeHeaders method to use http.Header.Set [#1722](https://github.com/gin-gonic/gin/pull/1722)
+- [NEW] Add response size to LogFormatterParams [#1752](https://github.com/gin-gonic/gin/pull/1752)
+- [NEW] Allow ignoring field on form mapping [#1733](https://github.com/gin-gonic/gin/pull/1733)
+- [NEW] Add a function to force color in console output. [#1724](https://github.com/gin-gonic/gin/pull/1724)
+- [FIX] Context.Next() - recheck len of handlers on every iteration. [#1745](https://github.com/gin-gonic/gin/pull/1745)
+- [FIX] Fix all errcheck warnings [#1739](https://github.com/gin-gonic/gin/pull/1739) [#1653](https://github.com/gin-gonic/gin/pull/1653)
+- [NEW] context: inherits context cancellation and deadline from http.Request context for Go>=1.7 [#1690](https://github.com/gin-gonic/gin/pull/1690)
+- [NEW] Binding for URL Params [#1694](https://github.com/gin-gonic/gin/pull/1694)
+- [NEW] Add LoggerWithFormatter method [#1677](https://github.com/gin-gonic/gin/pull/1677)
+- [FIX] CI testing updates [#1671](https://github.com/gin-gonic/gin/pull/1671) [#1670](https://github.com/gin-gonic/gin/pull/1670) [#1682](https://github.com/gin-gonic/gin/pull/1682) [#1669](https://github.com/gin-gonic/gin/pull/1669)
+- [FIX] StaticFS(): Send 404 when path does not exist [#1663](https://github.com/gin-gonic/gin/pull/1663)
+- [FIX] Handle nil body for JSON binding [#1638](https://github.com/gin-gonic/gin/pull/1638)
+- [FIX] Support bind uri param [#1612](https://github.com/gin-gonic/gin/pull/1612)
+- [FIX] recovery: fix issue with syscall import on google app engine [#1640](https://github.com/gin-gonic/gin/pull/1640)
+- [FIX] Make sure the debug log contains line breaks [#1650](https://github.com/gin-gonic/gin/pull/1650)
+- [FIX] Panic stack trace being printed during recovery of broken pipe [#1089](https://github.com/gin-gonic/gin/pull/1089) [#1259](https://github.com/gin-gonic/gin/pull/1259)
+- [NEW] RunFd method to run http.Server through a file descriptor [#1609](https://github.com/gin-gonic/gin/pull/1609)
+- [NEW] Yaml binding support [#1618](https://github.com/gin-gonic/gin/pull/1618)
+- [FIX] Pass MaxMultipartMemory when FormFile is called [#1600](https://github.com/gin-gonic/gin/pull/1600)
+- [FIX] LoadHTML* tests [#1559](https://github.com/gin-gonic/gin/pull/1559)
+- [FIX] Removed use of sync.pool from HandleContext [#1565](https://github.com/gin-gonic/gin/pull/1565)
+- [FIX] Format output log to os.Stderr [#1571](https://github.com/gin-gonic/gin/pull/1571)
+- [FIX] Make logger use a yellow background and a darkgray text for legibility [#1570](https://github.com/gin-gonic/gin/pull/1570)
+- [FIX] Remove sensitive request information from panic log. [#1370](https://github.com/gin-gonic/gin/pull/1370)
+- [FIX] log.Println() does not print timestamp [#829](https://github.com/gin-gonic/gin/pull/829) [#1560](https://github.com/gin-gonic/gin/pull/1560)
+- [NEW] Add PureJSON renderer [#694](https://github.com/gin-gonic/gin/pull/694)
+- [FIX] Add missing copyright and update if/else [#1497](https://github.com/gin-gonic/gin/pull/1497)
+- [FIX] Update msgpack usage [#1498](https://github.com/gin-gonic/gin/pull/1498)
+- [FIX] Use protobuf on render [#1496](https://github.com/gin-gonic/gin/pull/1496)
+- [FIX] Add support for Protobuf format response [#1479](https://github.com/gin-gonic/gin/pull/1479)
+- [NEW] Set default time format in form binding [#1487](https://github.com/gin-gonic/gin/pull/1487)
+- [FIX] Add BindXML and ShouldBindXML [#1485](https://github.com/gin-gonic/gin/pull/1485)
+- [NEW] Upgrade dependency libraries [#1491](https://github.com/gin-gonic/gin/pull/1491)
+
+
+### Gin 1.3.0
+
+- [NEW] Add [`func (*Context) QueryMap`](https://godoc.org/github.com/gin-gonic/gin#Context.QueryMap), [`func (*Context) GetQueryMap`](https://godoc.org/github.com/gin-gonic/gin#Context.GetQueryMap), [`func (*Context) PostFormMap`](https://godoc.org/github.com/gin-gonic/gin#Context.PostFormMap) and [`func (*Context) GetPostFormMap`](https://godoc.org/github.com/gin-gonic/gin#Context.GetPostFormMap) to support `type map[string]string` as query string or form parameters, see [#1383](https://github.com/gin-gonic/gin/pull/1383)
+- [NEW] Add [`func (*Context) AsciiJSON`](https://godoc.org/github.com/gin-gonic/gin#Context.AsciiJSON), see [#1358](https://github.com/gin-gonic/gin/pull/1358)
+- [NEW] Add `Pusher()` in [`type ResponseWriter`](https://godoc.org/github.com/gin-gonic/gin#ResponseWriter) for supporting http2 push, see [#1273](https://github.com/gin-gonic/gin/pull/1273)
+- [NEW] Add [`func (*Context) DataFromReader`](https://godoc.org/github.com/gin-gonic/gin#Context.DataFromReader) for serving dynamic data, see [#1304](https://github.com/gin-gonic/gin/pull/1304)
+- [NEW] Add [`func (*Context) ShouldBindBodyWith`](https://godoc.org/github.com/gin-gonic/gin#Context.ShouldBindBodyWith) allowing to call binding multiple times, see [#1341](https://github.com/gin-gonic/gin/pull/1341)
+- [NEW] Support pointers in form binding, see [#1336](https://github.com/gin-gonic/gin/pull/1336)
+- [NEW] Add [`func (*Context) JSONP`](https://godoc.org/github.com/gin-gonic/gin#Context.JSONP), see [#1333](https://github.com/gin-gonic/gin/pull/1333)
+- [NEW] Support default value in form binding, see [#1138](https://github.com/gin-gonic/gin/pull/1138)
+- [NEW] Expose validator engine in [`type StructValidator`](https://godoc.org/github.com/gin-gonic/gin/binding#StructValidator), see [#1277](https://github.com/gin-gonic/gin/pull/1277)
+- [NEW] Add [`func (*Context) ShouldBind`](https://godoc.org/github.com/gin-gonic/gin#Context.ShouldBind), [`func (*Context) ShouldBindQuery`](https://godoc.org/github.com/gin-gonic/gin#Context.ShouldBindQuery) and [`func (*Context) ShouldBindJSON`](https://godoc.org/github.com/gin-gonic/gin#Context.ShouldBindJSON), see [#1047](https://github.com/gin-gonic/gin/pull/1047)
+- [NEW] Add support for `time.Time` location in form binding, see [#1117](https://github.com/gin-gonic/gin/pull/1117)
+- [NEW] Add [`func (*Context) BindQuery`](https://godoc.org/github.com/gin-gonic/gin#Context.BindQuery), see [#1029](https://github.com/gin-gonic/gin/pull/1029)
+- [NEW] Make [jsonite](https://github.com/json-iterator/go) optional with build tags, see [#1026](https://github.com/gin-gonic/gin/pull/1026)
+- [NEW] Show query string in logger, see [#999](https://github.com/gin-gonic/gin/pull/999)
+- [NEW] Add [`func (*Context) SecureJSON`](https://godoc.org/github.com/gin-gonic/gin#Context.SecureJSON), see [#987](https://github.com/gin-gonic/gin/pull/987) and [#993](https://github.com/gin-gonic/gin/pull/993)
+- [DEPRECATE] `func (*Context) GetCookie` for [`func (*Context) Cookie`](https://godoc.org/github.com/gin-gonic/gin#Context.Cookie)
+- [FIX] Don't display color tags if [`func DisableConsoleColor`](https://godoc.org/github.com/gin-gonic/gin#DisableConsoleColor) called, see [#1072](https://github.com/gin-gonic/gin/pull/1072)
+- [FIX] Gin Mode `""` when calling [`func Mode`](https://godoc.org/github.com/gin-gonic/gin#Mode) now returns `const DebugMode`, see [#1250](https://github.com/gin-gonic/gin/pull/1250)
+- [FIX] `Flush()` now doesn't overwrite `responseWriter` status code, see [#1460](https://github.com/gin-gonic/gin/pull/1460)
+
+### Gin 1.2.0
+
+- [NEW] Switch from godeps to govendor
+- [NEW] Add support for Let's Encrypt via gin-gonic/autotls
+- [NEW] Improve README examples and add extra at examples folder
+- [NEW] Improved support with App Engine
+- [NEW] Add custom template delimiters, see #860
+- [NEW] Add Template Func Maps, see #962
+- [NEW] Add \*context.Handler(), see #928
+- [NEW] Add \*context.GetRawData()
+- [NEW] Add \*context.GetHeader() (request)
+- [NEW] Add \*context.AbortWithStatusJSON() (JSON content type)
+- [NEW] Add \*context.Keys type cast helpers
+- [NEW] Add \*context.ShouldBindWith()
+- [NEW] Add \*context.MustBindWith()
+- [NEW] Add \*engine.SetFuncMap()
+- [DEPRECATE] On next release: \*context.BindWith(), see #855
+- [FIX] Refactor render
+- [FIX] Reworked tests
+- [FIX] logger now supports cygwin
+- [FIX] Use X-Forwarded-For before X-Real-Ip
+- [FIX] time.Time binding (#904)
+
+### Gin 1.1.4
+
+- [NEW] Support google appengine for IsTerminal func
+
+### Gin 1.1.3
+
+- [FIX] Reverted Logger: skip ANSI color commands
+
+### Gin 1.1
+
+- [NEW] Implement QueryArray and PostArray methods 
+- [NEW] Refactor GetQuery and GetPostForm 
+- [NEW] Add contribution guide 
+- [FIX] Corrected typos in README
+- [FIX] Removed additional Iota  
+- [FIX] Changed imports to gopkg instead of github in README (#733) 
+- [FIX] Logger: skip ANSI color commands if output is not a tty
+
+### Gin 1.0rc2 (...)
+
+- [PERFORMANCE] Fast path for writing Content-Type.
+- [PERFORMANCE] Much faster 404 routing
+- [PERFORMANCE] Allocation optimizations
+- [PERFORMANCE] Faster root tree lookup
+- [PERFORMANCE] Zero overhead, String() and JSON() rendering.
+- [PERFORMANCE] Faster ClientIP parsing
+- [PERFORMANCE] Much faster SSE implementation
+- [NEW] Benchmarks suite
+- [NEW] Bind validation can be disabled and replaced with custom validators.
+- [NEW] More flexible HTML render
+- [NEW] Multipart and PostForm bindings
+- [NEW] Adds method to return all the registered routes
+- [NEW] Context.HandlerName() returns the main handler's name
+- [NEW] Adds Error.IsType() helper
+- [FIX] Binding multipart form
+- [FIX] Integration tests
+- [FIX] Crash when binding non struct object in Context.
+- [FIX] RunTLS() implementation
+- [FIX] Logger() unit tests
+- [FIX] Adds SetHTMLTemplate() warning
+- [FIX] Context.IsAborted()
+- [FIX] More unit tests
+- [FIX] JSON, XML, HTML renders accept custom content-types
+- [FIX] gin.AbortIndex is unexported
+- [FIX] Better approach to avoid directory listing in StaticFS()
+- [FIX] Context.ClientIP() always returns the IP with trimmed spaces.
+- [FIX] Better warning when running in debug mode.
+- [FIX] Google App Engine integration. debugPrint does not use os.Stdout
+- [FIX] Fixes integer overflow in error type
+- [FIX] Error implements the json.Marshaller interface
+- [FIX] MIT license in every file
+
+
+### Gin 1.0rc1 (May 22, 2015)
+
+- [PERFORMANCE] Zero allocation router
+- [PERFORMANCE] Faster JSON, XML and text rendering
+- [PERFORMANCE] Custom hand optimized HttpRouter for Gin
+- [PERFORMANCE] Misc code optimizations. Inlining, tail call optimizations
+- [NEW] Built-in support for golang.org/x/net/context
+- [NEW] Any(path, handler). Create a route that matches any path
+- [NEW] Refactored rendering pipeline (faster and static typeded)
+- [NEW] Refactored errors API
+- [NEW] IndentedJSON() prints pretty JSON
+- [NEW] Added gin.DefaultWriter
+- [NEW] UNIX socket support
+- [NEW] RouterGroup.BasePath is exposed
+- [NEW] JSON validation using go-validate-yourself (very powerful options)
+- [NEW] Completed suite of unit tests
+- [NEW] HTTP streaming with c.Stream()
+- [NEW] StaticFile() creates a router for serving just one file.
+- [NEW] StaticFS() has an option to disable directory listing.
+- [NEW] StaticFS() for serving static files through virtual filesystems
+- [NEW] Server-Sent Events native support
+- [NEW] WrapF() and WrapH() helpers for wrapping http.HandlerFunc and http.Handler
+- [NEW] Added LoggerWithWriter() middleware
+- [NEW] Added RecoveryWithWriter() middleware
+- [NEW] Added DefaultPostFormValue()
+- [NEW] Added DefaultFormValue()
+- [NEW] Added DefaultParamValue()
+- [FIX] BasicAuth() when using custom realm
+- [FIX] Bug when serving static files in nested routing group
+- [FIX] Redirect using built-in http.Redirect()
+- [FIX] Logger when printing the requested path
+- [FIX] Documentation typos
+- [FIX] Context.Engine renamed to Context.engine
+- [FIX] Better debugging messages
+- [FIX] ErrorLogger
+- [FIX] Debug HTTP render
+- [FIX] Refactored binding and render modules
+- [FIX] Refactored Context initialization
+- [FIX] Refactored BasicAuth()
+- [FIX] NoMethod/NoRoute handlers
+- [FIX] Hijacking http
+- [FIX] Better support for Google App Engine (using log instead of fmt)
+
+
+### Gin 0.6 (Mar 9, 2015)
+
+- [NEW] Support multipart/form-data
+- [NEW] NoMethod handler
+- [NEW] Validate sub structures
+- [NEW] Support for HTTP Realm Auth
+- [FIX] Unsigned integers in binding
+- [FIX] Improve color logger
+
+
+### Gin 0.5 (Feb 7, 2015)
+
+- [NEW] Content Negotiation
+- [FIX] Solved security bug that allow a client to spoof ip
+- [FIX] Fix unexported/ignored fields in binding
+
+
+### Gin 0.4 (Aug 21, 2014)
+
+- [NEW] Development mode
+- [NEW] Unit tests
+- [NEW] Add Content.Redirect()
+- [FIX] Deferring WriteHeader()
+- [FIX] Improved documentation for model binding
+
+
+### Gin 0.3 (Jul 18, 2014)
+
+- [PERFORMANCE] Normal log and error log are printed in the same call.
+- [PERFORMANCE] Improve performance of NoRouter()
+- [PERFORMANCE] Improve context's memory locality, reduce CPU cache faults.
+- [NEW] Flexible rendering API
+- [NEW] Add Context.File()
+- [NEW] Add shorcut RunTLS() for http.ListenAndServeTLS
+- [FIX] Rename NotFound404() to NoRoute()
+- [FIX] Errors in context are purged
+- [FIX] Adds HEAD method in Static file serving
+- [FIX] Refactors Static() file serving
+- [FIX] Using keyed initialization to fix app-engine integration
+- [FIX] Can't unmarshal JSON array, #63
+- [FIX] Renaming Context.Req to Context.Request
+- [FIX] Check application/x-www-form-urlencoded when parsing form
+
+
+### Gin 0.2b (Jul 08, 2014)
+- [PERFORMANCE] Using sync.Pool to allocatio/gc overhead
+- [NEW] Travis CI integration
+- [NEW] Completely new logger
+- [NEW] New API for serving static files. gin.Static()
+- [NEW] gin.H() can be serialized into XML
+- [NEW] Typed errors. Errors can be typed. Internet/external/custom.
+- [NEW] Support for Godeps
+- [NEW] Travis/Godocs badges in README
+- [NEW] New Bind() and BindWith() methods for parsing request body.
+- [NEW] Add Content.Copy()
+- [NEW] Add context.LastError()
+- [NEW] Add shorcut for OPTIONS HTTP method
+- [FIX] Tons of README fixes
+- [FIX] Header is written before body
+- [FIX] BasicAuth() and changes API a little bit
+- [FIX] Recovery() middleware only prints panics
+- [FIX] Context.Get() does not panic anymore. Use MustGet() instead.
+- [FIX] Multiple http.WriteHeader() in NotFound handlers
+- [FIX] Engine.Run() panics if http server can't be setted up
+- [FIX] Crash when route path doesn't start with '/'
+- [FIX] Do not update header when status code is negative
+- [FIX] Setting response headers before calling WriteHeader in context.String()
+- [FIX] Add MIT license
+- [FIX] Changes behaviour of ErrorLogger() and Logger()

backend/vendor/github.com/gin-gonic/gin/CODE_OF_CONDUCT.md

@@ -0,0 +1,46 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as contributors and maintainers pledge to making participation in our project and our community a harassment-free experience for everyone, regardless of age, body size, disability, ethnicity, gender identity and expression, level of experience, nationality, personal appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable behavior and are expected to take appropriate and fair corrective action in response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, or to ban temporarily or permanently any contributor for other behaviors that they deem inappropriate, threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces when an individual is representing the project or its community. Examples of representing a project or community include using an official project e-mail address, posting via an official social media account, or acting as an appointed representative at an online or offline event. Representation of a project may be further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting the project team at teamgingonic@gmail.com. The project team will review and investigate all complaints, and will respond in a way that it deems appropriate to the circumstances. The project team is obligated to maintain confidentiality with regard to the reporter of an incident. Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good faith may face temporary or permanent repercussions as determined by other members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4, available at [http://contributor-covenant.org/version/1/4][version]
+
+[homepage]: http://contributor-covenant.org
+[version]: http://contributor-covenant.org/version/1/4/

backend/vendor/github.com/gin-gonic/gin/CONTRIBUTING.md

@@ -0,0 +1,13 @@
+## Contributing 
+
+- With issues:
+  - Use the search tool before opening a new issue.
+  - Please provide source code and commit sha if you found a bug.
+  - Review existing issues and provide feedback or react to them.
+
+- With pull requests:
+  - Open your pull request against `master`
+  - Your pull request should have no more than two commits, if not you should squash them.
+  - It should pass all tests in the available continuous integrations systems such as TravisCI.
+  - You should add/modify tests to cover your proposed code changes.
+  - If your pull request contains a new feature, please document it on the README.

backend/vendor/github.com/gin-gonic/gin/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Manuel Martínez-Almeida
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

backend/vendor/github.com/gin-gonic/gin/Makefile

@@ -0,0 +1,80 @@
+GO ?= go
+GOFMT ?= gofmt "-s"
+PACKAGES ?= $(shell $(GO) list ./... | grep -v /vendor/)
+VETPACKAGES ?= $(shell $(GO) list ./... | grep -v /vendor/ | grep -v /examples/)
+GOFILES := $(shell find . -name "*.go" -type f -not -path "./vendor/*")
+TESTFOLDER := $(shell $(GO) list ./... | grep -E 'gin$$|binding$$|render$$' | grep -v examples)
+
+all: install
+
+install: deps
+	govendor sync
+
+.PHONY: test
+test:
+	echo "mode: count" > coverage.out
+	for d in $(TESTFOLDER); do \
+		$(GO) test -v -covermode=count -coverprofile=profile.out $$d > tmp.out; \
+		cat tmp.out; \
+		if grep -q "^--- FAIL" tmp.out; then \
+			rm tmp.out; \
+			exit 1; \
+		elif grep -q "build failed" tmp.out; then \
+			rm tmp.out; \
+			exit 1; \
+		elif grep -q "setup failed" tmp.out; then \
+			rm tmp.out; \
+			exit 1; \
+		fi; \
+		if [ -f profile.out ]; then \
+			cat profile.out | grep -v "mode:" >> coverage.out; \
+			rm profile.out; \
+		fi; \
+	done
+
+.PHONY: fmt
+fmt:
+	$(GOFMT) -w $(GOFILES)
+
+.PHONY: fmt-check
+fmt-check:
+	@diff=$$($(GOFMT) -d $(GOFILES)); \
+	if [ -n "$$diff" ]; then \
+		echo "Please run 'make fmt' and commit the result:"; \
+		echo "$${diff}"; \
+		exit 1; \
+	fi;
+
+vet:
+	$(GO) vet $(VETPACKAGES)
+
+deps:
+	@hash govendor > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
+		$(GO) get -u github.com/kardianos/govendor; \
+	fi
+
+.PHONY: lint
+lint:
+	@hash golint > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
+		$(GO) get -u golang.org/x/lint/golint; \
+	fi
+	for PKG in $(PACKAGES); do golint -set_exit_status $$PKG || exit 1; done;
+
+.PHONY: misspell-check
+misspell-check:
+	@hash misspell > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
+		$(GO) get -u github.com/client9/misspell/cmd/misspell; \
+	fi
+	misspell -error $(GOFILES)
+
+.PHONY: misspell
+misspell:
+	@hash misspell > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
+		$(GO) get -u github.com/client9/misspell/cmd/misspell; \
+	fi
+	misspell -w $(GOFILES)
+
+.PHONY: tools
+tools:
+	go install golang.org/x/lint/golint; \
+	go install github.com/client9/misspell/cmd/misspell;

backend/vendor/github.com/gin-gonic/gin/auth.go

@@ -0,0 +1,96 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import (
+	"crypto/subtle"
+	"encoding/base64"
+	"net/http"
+	"strconv"
+)
+
+// AuthUserKey is the cookie name for user credential in basic auth.
+const AuthUserKey = "user"
+
+// Accounts defines a key/value for user/pass list of authorized logins.
+type Accounts map[string]string
+
+type authPair struct {
+	value string
+	user  string
+}
+
+type authPairs []authPair
+
+func (a authPairs) searchCredential(authValue string) (string, bool) {
+	if authValue == "" {
+		return "", false
+	}
+	for _, pair := range a {
+		if pair.value == authValue {
+			return pair.user, true
+		}
+	}
+	return "", false
+}
+
+// BasicAuthForRealm returns a Basic HTTP Authorization middleware. It takes as arguments a map[string]string where
+// the key is the user name and the value is the password, as well as the name of the Realm.
+// If the realm is empty, "Authorization Required" will be used by default.
+// (see http://tools.ietf.org/html/rfc2617#section-1.2)
+func BasicAuthForRealm(accounts Accounts, realm string) HandlerFunc {
+	if realm == "" {
+		realm = "Authorization Required"
+	}
+	realm = "Basic realm=" + strconv.Quote(realm)
+	pairs := processAccounts(accounts)
+	return func(c *Context) {
+		// Search user in the slice of allowed credentials
+		user, found := pairs.searchCredential(c.requestHeader("Authorization"))
+		if !found {
+			// Credentials doesn't match, we return 401 and abort handlers chain.
+			c.Header("WWW-Authenticate", realm)
+			c.AbortWithStatus(http.StatusUnauthorized)
+			return
+		}
+
+		// The user credentials was found, set user's id to key AuthUserKey in this context, the user's id can be read later using
+		// c.MustGet(gin.AuthUserKey).
+		c.Set(AuthUserKey, user)
+	}
+}
+
+// BasicAuth returns a Basic HTTP Authorization middleware. It takes as argument a map[string]string where
+// the key is the user name and the value is the password.
+func BasicAuth(accounts Accounts) HandlerFunc {
+	return BasicAuthForRealm(accounts, "")
+}
+
+func processAccounts(accounts Accounts) authPairs {
+	assert1(len(accounts) > 0, "Empty list of authorized credentials")
+	pairs := make(authPairs, 0, len(accounts))
+	for user, password := range accounts {
+		assert1(user != "", "User can not be empty")
+		value := authorizationHeader(user, password)
+		pairs = append(pairs, authPair{
+			value: value,
+			user:  user,
+		})
+	}
+	return pairs
+}
+
+func authorizationHeader(user, password string) string {
+	base := user + ":" + password
+	return "Basic " + base64.StdEncoding.EncodeToString([]byte(base))
+}
+
+func secureCompare(given, actual string) bool {
+	if subtle.ConstantTimeEq(int32(len(given)), int32(len(actual))) == 1 {
+		return subtle.ConstantTimeCompare([]byte(given), []byte(actual)) == 1
+	}
+	// Securely compare actual to itself to keep constant time, but always return false.
+	return subtle.ConstantTimeCompare([]byte(actual), []byte(actual)) == 1 && false
+}

backend/vendor/github.com/gin-gonic/gin/binding/binding.go

@@ -0,0 +1,113 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package binding
+
+import "net/http"
+
+// Content-Type MIME of the most common data formats.
+const (
+	MIMEJSON              = "application/json"
+	MIMEHTML              = "text/html"
+	MIMEXML               = "application/xml"
+	MIMEXML2              = "text/xml"
+	MIMEPlain             = "text/plain"
+	MIMEPOSTForm          = "application/x-www-form-urlencoded"
+	MIMEMultipartPOSTForm = "multipart/form-data"
+	MIMEPROTOBUF          = "application/x-protobuf"
+	MIMEMSGPACK           = "application/x-msgpack"
+	MIMEMSGPACK2          = "application/msgpack"
+	MIMEYAML              = "application/x-yaml"
+)
+
+// Binding describes the interface which needs to be implemented for binding the
+// data present in the request such as JSON request body, query parameters or
+// the form POST.
+type Binding interface {
+	Name() string
+	Bind(*http.Request, interface{}) error
+}
+
+// BindingBody adds BindBody method to Binding. BindBody is similar with Bind,
+// but it reads the body from supplied bytes instead of req.Body.
+type BindingBody interface {
+	Binding
+	BindBody([]byte, interface{}) error
+}
+
+// BindingUri adds BindUri method to Binding. BindUri is similar with Bind,
+// but it read the Params.
+type BindingUri interface {
+	Name() string
+	BindUri(map[string][]string, interface{}) error
+}
+
+// StructValidator is the minimal interface which needs to be implemented in
+// order for it to be used as the validator engine for ensuring the correctness
+// of the request. Gin provides a default implementation for this using
+// https://github.com/go-playground/validator/tree/v8.18.2.
+type StructValidator interface {
+	// ValidateStruct can receive any kind of type and it should never panic, even if the configuration is not right.
+	// If the received type is not a struct, any validation should be skipped and nil must be returned.
+	// If the received type is a struct or pointer to a struct, the validation should be performed.
+	// If the struct is not valid or the validation itself fails, a descriptive error should be returned.
+	// Otherwise nil must be returned.
+	ValidateStruct(interface{}) error
+
+	// Engine returns the underlying validator engine which powers the
+	// StructValidator implementation.
+	Engine() interface{}
+}
+
+// Validator is the default validator which implements the StructValidator
+// interface. It uses https://github.com/go-playground/validator/tree/v8.18.2
+// under the hood.
+var Validator StructValidator = &defaultValidator{}
+
+// These implement the Binding interface and can be used to bind the data
+// present in the request to struct instances.
+var (
+	JSON          = jsonBinding{}
+	XML           = xmlBinding{}
+	Form          = formBinding{}
+	Query         = queryBinding{}
+	FormPost      = formPostBinding{}
+	FormMultipart = formMultipartBinding{}
+	ProtoBuf      = protobufBinding{}
+	MsgPack       = msgpackBinding{}
+	YAML          = yamlBinding{}
+	Uri           = uriBinding{}
+)
+
+// Default returns the appropriate Binding instance based on the HTTP method
+// and the content type.
+func Default(method, contentType string) Binding {
+	if method == "GET" {
+		return Form
+	}
+
+	switch contentType {
+	case MIMEJSON:
+		return JSON
+	case MIMEXML, MIMEXML2:
+		return XML
+	case MIMEPROTOBUF:
+		return ProtoBuf
+	case MIMEMSGPACK, MIMEMSGPACK2:
+		return MsgPack
+	case MIMEYAML:
+		return YAML
+	case MIMEMultipartPOSTForm:
+		return FormMultipart
+	default: // case MIMEPOSTForm:
+		return Form
+	}
+}
+
+func validate(obj interface{}) error {
+	if Validator == nil {
+		return nil
+	}
+	return Validator.ValidateStruct(obj)
+}

backend/vendor/github.com/gin-gonic/gin/binding/default_validator.go

@@ -0,0 +1,51 @@
+// Copyright 2017 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package binding
+
+import (
+	"reflect"
+	"sync"
+
+	"gopkg.in/go-playground/validator.v8"
+)
+
+type defaultValidator struct {
+	once     sync.Once
+	validate *validator.Validate
+}
+
+var _ StructValidator = &defaultValidator{}
+
+// ValidateStruct receives any kind of type, but only performed struct or pointer to struct type.
+func (v *defaultValidator) ValidateStruct(obj interface{}) error {
+	value := reflect.ValueOf(obj)
+	valueType := value.Kind()
+	if valueType == reflect.Ptr {
+		valueType = value.Elem().Kind()
+	}
+	if valueType == reflect.Struct {
+		v.lazyinit()
+		if err := v.validate.Struct(obj); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Engine returns the underlying validator engine which powers the default
+// Validator instance. This is useful if you want to register custom validations
+// or struct level validations. See validator GoDoc for more info -
+// https://godoc.org/gopkg.in/go-playground/validator.v8
+func (v *defaultValidator) Engine() interface{} {
+	v.lazyinit()
+	return v.validate
+}
+
+func (v *defaultValidator) lazyinit() {
+	v.once.Do(func() {
+		config := &validator.Config{TagName: "binding"}
+		v.validate = validator.New(config)
+	})
+}

backend/vendor/github.com/gin-gonic/gin/binding/form.go

@@ -0,0 +1,89 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package binding
+
+import (
+	"mime/multipart"
+	"net/http"
+	"reflect"
+)
+
+const defaultMemory = 32 * 1024 * 1024
+
+type formBinding struct{}
+type formPostBinding struct{}
+type formMultipartBinding struct{}
+
+func (formBinding) Name() string {
+	return "form"
+}
+
+func (formBinding) Bind(req *http.Request, obj interface{}) error {
+	if err := req.ParseForm(); err != nil {
+		return err
+	}
+	if err := req.ParseMultipartForm(defaultMemory); err != nil {
+		if err != http.ErrNotMultipart {
+			return err
+		}
+	}
+	if err := mapForm(obj, req.Form); err != nil {
+		return err
+	}
+	return validate(obj)
+}
+
+func (formPostBinding) Name() string {
+	return "form-urlencoded"
+}
+
+func (formPostBinding) Bind(req *http.Request, obj interface{}) error {
+	if err := req.ParseForm(); err != nil {
+		return err
+	}
+	if err := mapForm(obj, req.PostForm); err != nil {
+		return err
+	}
+	return validate(obj)
+}
+
+func (formMultipartBinding) Name() string {
+	return "multipart/form-data"
+}
+
+func (formMultipartBinding) Bind(req *http.Request, obj interface{}) error {
+	if err := req.ParseMultipartForm(defaultMemory); err != nil {
+		return err
+	}
+	if err := mappingByPtr(obj, (*multipartRequest)(req), "form"); err != nil {
+		return err
+	}
+
+	return validate(obj)
+}
+
+type multipartRequest http.Request
+
+var _ setter = (*multipartRequest)(nil)
+
+var (
+	multipartFileHeaderStructType = reflect.TypeOf(multipart.FileHeader{})
+)
+
+// TrySet tries to set a value by the multipart request with the binding a form file
+func (r *multipartRequest) TrySet(value reflect.Value, field reflect.StructField, key string, opt setOptions) (isSetted bool, err error) {
+	if value.Type() == multipartFileHeaderStructType {
+		_, file, err := (*http.Request)(r).FormFile(key)
+		if err != nil {
+			return false, err
+		}
+		if file != nil {
+			value.Set(reflect.ValueOf(*file))
+			return true, nil
+		}
+	}
+
+	return setByForm(value, field, r.MultipartForm.Value, key, opt)
+}

backend/vendor/github.com/gin-gonic/gin/binding/form_mapping.go

@@ -0,0 +1,330 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package binding
+
+import (
+	"errors"
+	"fmt"
+	"reflect"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/gin-gonic/gin/internal/json"
+)
+
+var errUnknownType = errors.New("Unknown type")
+
+func mapUri(ptr interface{}, m map[string][]string) error {
+	return mapFormByTag(ptr, m, "uri")
+}
+
+func mapForm(ptr interface{}, form map[string][]string) error {
+	return mapFormByTag(ptr, form, "form")
+}
+
+var emptyField = reflect.StructField{}
+
+func mapFormByTag(ptr interface{}, form map[string][]string, tag string) error {
+	return mappingByPtr(ptr, formSource(form), tag)
+}
+
+// setter tries to set value on a walking by fields of a struct
+type setter interface {
+	TrySet(value reflect.Value, field reflect.StructField, key string, opt setOptions) (isSetted bool, err error)
+}
+
+type formSource map[string][]string
+
+var _ setter = formSource(nil)
+
+// TrySet tries to set a value by request's form source (like map[string][]string)
+func (form formSource) TrySet(value reflect.Value, field reflect.StructField, tagValue string, opt setOptions) (isSetted bool, err error) {
+	return setByForm(value, field, form, tagValue, opt)
+}
+
+func mappingByPtr(ptr interface{}, setter setter, tag string) error {
+	_, err := mapping(reflect.ValueOf(ptr), emptyField, setter, tag)
+	return err
+}
+
+func mapping(value reflect.Value, field reflect.StructField, setter setter, tag string) (bool, error) {
+	var vKind = value.Kind()
+
+	if vKind == reflect.Ptr {
+		var isNew bool
+		vPtr := value
+		if value.IsNil() {
+			isNew = true
+			vPtr = reflect.New(value.Type().Elem())
+		}
+		isSetted, err := mapping(vPtr.Elem(), field, setter, tag)
+		if err != nil {
+			return false, err
+		}
+		if isNew && isSetted {
+			value.Set(vPtr)
+		}
+		return isSetted, nil
+	}
+
+	ok, err := tryToSetValue(value, field, setter, tag)
+	if err != nil {
+		return false, err
+	}
+	if ok {
+		return true, nil
+	}
+
+	if vKind == reflect.Struct {
+		tValue := value.Type()
+
+		var isSetted bool
+		for i := 0; i < value.NumField(); i++ {
+			if !value.Field(i).CanSet() {
+				continue
+			}
+			ok, err := mapping(value.Field(i), tValue.Field(i), setter, tag)
+			if err != nil {
+				return false, err
+			}
+			isSetted = isSetted || ok
+		}
+		return isSetted, nil
+	}
+	return false, nil
+}
+
+type setOptions struct {
+	isDefaultExists bool
+	defaultValue    string
+}
+
+func tryToSetValue(value reflect.Value, field reflect.StructField, setter setter, tag string) (bool, error) {
+	var tagValue string
+	var setOpt setOptions
+
+	tagValue = field.Tag.Get(tag)
+	tagValue, opts := head(tagValue, ",")
+
+	if tagValue == "-" { // just ignoring this field
+		return false, nil
+	}
+	if tagValue == "" { // default value is FieldName
+		tagValue = field.Name
+	}
+	if tagValue == "" { // when field is "emptyField" variable
+		return false, nil
+	}
+
+	var opt string
+	for len(opts) > 0 {
+		opt, opts = head(opts, ",")
+
+		k, v := head(opt, "=")
+		switch k {
+		case "default":
+			setOpt.isDefaultExists = true
+			setOpt.defaultValue = v
+		}
+	}
+
+	return setter.TrySet(value, field, tagValue, setOpt)
+}
+
+func setByForm(value reflect.Value, field reflect.StructField, form map[string][]string, tagValue string, opt setOptions) (isSetted bool, err error) {
+	vs, ok := form[tagValue]
+	if !ok && !opt.isDefaultExists {
+		return false, nil
+	}
+
+	switch value.Kind() {
+	case reflect.Slice:
+		if !ok {
+			vs = []string{opt.defaultValue}
+		}
+		return true, setSlice(vs, value, field)
+	case reflect.Array:
+		if !ok {
+			vs = []string{opt.defaultValue}
+		}
+		if len(vs) != value.Len() {
+			return false, fmt.Errorf("%q is not valid value for %s", vs, value.Type().String())
+		}
+		return true, setArray(vs, value, field)
+	default:
+		var val string
+		if !ok {
+			val = opt.defaultValue
+		}
+
+		if len(vs) > 0 {
+			val = vs[0]
+		}
+		return true, setWithProperType(val, value, field)
+	}
+}
+
+func setWithProperType(val string, value reflect.Value, field reflect.StructField) error {
+	switch value.Kind() {
+	case reflect.Int:
+		return setIntField(val, 0, value)
+	case reflect.Int8:
+		return setIntField(val, 8, value)
+	case reflect.Int16:
+		return setIntField(val, 16, value)
+	case reflect.Int32:
+		return setIntField(val, 32, value)
+	case reflect.Int64:
+		switch value.Interface().(type) {
+		case time.Duration:
+			return setTimeDuration(val, value, field)
+		}
+		return setIntField(val, 64, value)
+	case reflect.Uint:
+		return setUintField(val, 0, value)
+	case reflect.Uint8:
+		return setUintField(val, 8, value)
+	case reflect.Uint16:
+		return setUintField(val, 16, value)
+	case reflect.Uint32:
+		return setUintField(val, 32, value)
+	case reflect.Uint64:
+		return setUintField(val, 64, value)
+	case reflect.Bool:
+		return setBoolField(val, value)
+	case reflect.Float32:
+		return setFloatField(val, 32, value)
+	case reflect.Float64:
+		return setFloatField(val, 64, value)
+	case reflect.String:
+		value.SetString(val)
+	case reflect.Struct:
+		switch value.Interface().(type) {
+		case time.Time:
+			return setTimeField(val, field, value)
+		}
+		return json.Unmarshal([]byte(val), value.Addr().Interface())
+	case reflect.Map:
+		return json.Unmarshal([]byte(val), value.Addr().Interface())
+	default:
+		return errUnknownType
+	}
+	return nil
+}
+
+func setIntField(val string, bitSize int, field reflect.Value) error {
+	if val == "" {
+		val = "0"
+	}
+	intVal, err := strconv.ParseInt(val, 10, bitSize)
+	if err == nil {
+		field.SetInt(intVal)
+	}
+	return err
+}
+
+func setUintField(val string, bitSize int, field reflect.Value) error {
+	if val == "" {
+		val = "0"
+	}
+	uintVal, err := strconv.ParseUint(val, 10, bitSize)
+	if err == nil {
+		field.SetUint(uintVal)
+	}
+	return err
+}
+
+func setBoolField(val string, field reflect.Value) error {
+	if val == "" {
+		val = "false"
+	}
+	boolVal, err := strconv.ParseBool(val)
+	if err == nil {
+		field.SetBool(boolVal)
+	}
+	return err
+}
+
+func setFloatField(val string, bitSize int, field reflect.Value) error {
+	if val == "" {
+		val = "0.0"
+	}
+	floatVal, err := strconv.ParseFloat(val, bitSize)
+	if err == nil {
+		field.SetFloat(floatVal)
+	}
+	return err
+}
+
+func setTimeField(val string, structField reflect.StructField, value reflect.Value) error {
+	timeFormat := structField.Tag.Get("time_format")
+	if timeFormat == "" {
+		timeFormat = time.RFC3339
+	}
+
+	if val == "" {
+		value.Set(reflect.ValueOf(time.Time{}))
+		return nil
+	}
+
+	l := time.Local
+	if isUTC, _ := strconv.ParseBool(structField.Tag.Get("time_utc")); isUTC {
+		l = time.UTC
+	}
+
+	if locTag := structField.Tag.Get("time_location"); locTag != "" {
+		loc, err := time.LoadLocation(locTag)
+		if err != nil {
+			return err
+		}
+		l = loc
+	}
+
+	t, err := time.ParseInLocation(timeFormat, val, l)
+	if err != nil {
+		return err
+	}
+
+	value.Set(reflect.ValueOf(t))
+	return nil
+}
+
+func setArray(vals []string, value reflect.Value, field reflect.StructField) error {
+	for i, s := range vals {
+		err := setWithProperType(s, value.Index(i), field)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func setSlice(vals []string, value reflect.Value, field reflect.StructField) error {
+	slice := reflect.MakeSlice(value.Type(), len(vals), len(vals))
+	err := setArray(vals, slice, field)
+	if err != nil {
+		return err
+	}
+	value.Set(slice)
+	return nil
+}
+
+func setTimeDuration(val string, value reflect.Value, field reflect.StructField) error {
+	d, err := time.ParseDuration(val)
+	if err != nil {
+		return err
+	}
+	value.Set(reflect.ValueOf(d))
+	return nil
+}
+
+func head(str, sep string) (head string, tail string) {
+	idx := strings.Index(str, sep)
+	if idx < 0 {
+		return str, ""
+	}
+	return str[:idx], str[idx+len(sep):]
+}

backend/vendor/github.com/gin-gonic/gin/binding/json.go

@@ -0,0 +1,47 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package binding
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/gin-gonic/gin/internal/json"
+)
+
+// EnableDecoderUseNumber is used to call the UseNumber method on the JSON
+// Decoder instance. UseNumber causes the Decoder to unmarshal a number into an
+// interface{} as a Number instead of as a float64.
+var EnableDecoderUseNumber = false
+
+type jsonBinding struct{}
+
+func (jsonBinding) Name() string {
+	return "json"
+}
+
+func (jsonBinding) Bind(req *http.Request, obj interface{}) error {
+	if req == nil || req.Body == nil {
+		return fmt.Errorf("invalid request")
+	}
+	return decodeJSON(req.Body, obj)
+}
+
+func (jsonBinding) BindBody(body []byte, obj interface{}) error {
+	return decodeJSON(bytes.NewReader(body), obj)
+}
+
+func decodeJSON(r io.Reader, obj interface{}) error {
+	decoder := json.NewDecoder(r)
+	if EnableDecoderUseNumber {
+		decoder.UseNumber()
+	}
+	if err := decoder.Decode(obj); err != nil {
+		return err
+	}
+	return validate(obj)
+}

backend/vendor/github.com/gin-gonic/gin/binding/msgpack.go

@@ -0,0 +1,35 @@
+// Copyright 2017 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package binding
+
+import (
+	"bytes"
+	"io"
+	"net/http"
+
+	"github.com/ugorji/go/codec"
+)
+
+type msgpackBinding struct{}
+
+func (msgpackBinding) Name() string {
+	return "msgpack"
+}
+
+func (msgpackBinding) Bind(req *http.Request, obj interface{}) error {
+	return decodeMsgPack(req.Body, obj)
+}
+
+func (msgpackBinding) BindBody(body []byte, obj interface{}) error {
+	return decodeMsgPack(bytes.NewReader(body), obj)
+}
+
+func decodeMsgPack(r io.Reader, obj interface{}) error {
+	cdc := new(codec.MsgpackHandle)
+	if err := codec.NewDecoder(r, cdc).Decode(&obj); err != nil {
+		return err
+	}
+	return validate(obj)
+}

backend/vendor/github.com/gin-gonic/gin/binding/protobuf.go

@@ -0,0 +1,36 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package binding
+
+import (
+	"io/ioutil"
+	"net/http"
+
+	"github.com/golang/protobuf/proto"
+)
+
+type protobufBinding struct{}
+
+func (protobufBinding) Name() string {
+	return "protobuf"
+}
+
+func (b protobufBinding) Bind(req *http.Request, obj interface{}) error {
+	buf, err := ioutil.ReadAll(req.Body)
+	if err != nil {
+		return err
+	}
+	return b.BindBody(buf, obj)
+}
+
+func (protobufBinding) BindBody(body []byte, obj interface{}) error {
+	if err := proto.Unmarshal(body, obj.(proto.Message)); err != nil {
+		return err
+	}
+	// Here it's same to return validate(obj), but util now we can't add
+	// `binding:""` to the struct which automatically generate by gen-proto
+	return nil
+	// return validate(obj)
+}

backend/vendor/github.com/gin-gonic/gin/binding/query.go

@@ -0,0 +1,21 @@
+// Copyright 2017 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package binding
+
+import "net/http"
+
+type queryBinding struct{}
+
+func (queryBinding) Name() string {
+	return "query"
+}
+
+func (queryBinding) Bind(req *http.Request, obj interface{}) error {
+	values := req.URL.Query()
+	if err := mapForm(obj, values); err != nil {
+		return err
+	}
+	return validate(obj)
+}

backend/vendor/github.com/gin-gonic/gin/binding/uri.go

@@ -0,0 +1,18 @@
+// Copyright 2018 Gin Core Team.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package binding
+
+type uriBinding struct{}
+
+func (uriBinding) Name() string {
+	return "uri"
+}
+
+func (uriBinding) BindUri(m map[string][]string, obj interface{}) error {
+	if err := mapUri(obj, m); err != nil {
+		return err
+	}
+	return validate(obj)
+}

backend/vendor/github.com/gin-gonic/gin/binding/xml.go

@@ -0,0 +1,33 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package binding
+
+import (
+	"bytes"
+	"encoding/xml"
+	"io"
+	"net/http"
+)
+
+type xmlBinding struct{}
+
+func (xmlBinding) Name() string {
+	return "xml"
+}
+
+func (xmlBinding) Bind(req *http.Request, obj interface{}) error {
+	return decodeXML(req.Body, obj)
+}
+
+func (xmlBinding) BindBody(body []byte, obj interface{}) error {
+	return decodeXML(bytes.NewReader(body), obj)
+}
+func decodeXML(r io.Reader, obj interface{}) error {
+	decoder := xml.NewDecoder(r)
+	if err := decoder.Decode(obj); err != nil {
+		return err
+	}
+	return validate(obj)
+}

backend/vendor/github.com/gin-gonic/gin/binding/yaml.go

@@ -0,0 +1,35 @@
+// Copyright 2018 Gin Core Team.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package binding
+
+import (
+	"bytes"
+	"io"
+	"net/http"
+
+	"gopkg.in/yaml.v2"
+)
+
+type yamlBinding struct{}
+
+func (yamlBinding) Name() string {
+	return "yaml"
+}
+
+func (yamlBinding) Bind(req *http.Request, obj interface{}) error {
+	return decodeYAML(req.Body, obj)
+}
+
+func (yamlBinding) BindBody(body []byte, obj interface{}) error {
+	return decodeYAML(bytes.NewReader(body), obj)
+}
+
+func decodeYAML(r io.Reader, obj interface{}) error {
+	decoder := yaml.NewDecoder(r)
+	if err := decoder.Decode(obj); err != nil {
+		return err
+	}
+	return validate(obj)
+}

backend/vendor/github.com/gin-gonic/gin/codecov.yml

@@ -0,0 +1,5 @@
+coverage:
+  notify:
+    gitter:
+      default:
+        url: https://webhooks.gitter.im/e/d90dcdeeab2f1e357165

backend/vendor/github.com/gin-gonic/gin/context_appengine.go

@@ -0,0 +1,11 @@
+// +build appengine
+
+// Copyright 2017 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+func init() {
+	defaultAppEngine = true
+}

backend/vendor/github.com/gin-gonic/gin/debug.go

@@ -0,0 +1,103 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import (
+	"bytes"
+	"fmt"
+	"html/template"
+	"os"
+	"runtime"
+	"strconv"
+	"strings"
+)
+
+const ginSupportMinGoVer = 8
+
+// IsDebugging returns true if the framework is running in debug mode.
+// Use SetMode(gin.ReleaseMode) to disable debug mode.
+func IsDebugging() bool {
+	return ginMode == debugCode
+}
+
+// DebugPrintRouteFunc indicates debug log output format.
+var DebugPrintRouteFunc func(httpMethod, absolutePath, handlerName string, nuHandlers int)
+
+func debugPrintRoute(httpMethod, absolutePath string, handlers HandlersChain) {
+	if IsDebugging() {
+		nuHandlers := len(handlers)
+		handlerName := nameOfFunction(handlers.Last())
+		if DebugPrintRouteFunc == nil {
+			debugPrint("%-6s %-25s --> %s (%d handlers)\n", httpMethod, absolutePath, handlerName, nuHandlers)
+		} else {
+			DebugPrintRouteFunc(httpMethod, absolutePath, handlerName, nuHandlers)
+		}
+	}
+}
+
+func debugPrintLoadTemplate(tmpl *template.Template) {
+	if IsDebugging() {
+		var buf bytes.Buffer
+		for _, tmpl := range tmpl.Templates() {
+			buf.WriteString("\t- ")
+			buf.WriteString(tmpl.Name())
+			buf.WriteString("\n")
+		}
+		debugPrint("Loaded HTML Templates (%d): \n%s\n", len(tmpl.Templates()), buf.String())
+	}
+}
+
+func debugPrint(format string, values ...interface{}) {
+	if IsDebugging() {
+		if !strings.HasSuffix(format, "\n") {
+			format += "\n"
+		}
+		fmt.Fprintf(os.Stderr, "[GIN-debug] "+format, values...)
+	}
+}
+
+func getMinVer(v string) (uint64, error) {
+	first := strings.IndexByte(v, '.')
+	last := strings.LastIndexByte(v, '.')
+	if first == last {
+		return strconv.ParseUint(v[first+1:], 10, 64)
+	}
+	return strconv.ParseUint(v[first+1:last], 10, 64)
+}
+
+func debugPrintWARNINGDefault() {
+	if v, e := getMinVer(runtime.Version()); e == nil && v <= ginSupportMinGoVer {
+		debugPrint(`[WARNING] Now Gin requires Go 1.8 or later and Go 1.9 will be required soon.
+
+`)
+	}
+	debugPrint(`[WARNING] Creating an Engine instance with the Logger and Recovery middleware already attached.
+
+`)
+}
+
+func debugPrintWARNINGNew() {
+	debugPrint(`[WARNING] Running in "debug" mode. Switch to "release" mode in production.
+ - using env:	export GIN_MODE=release
+ - using code:	gin.SetMode(gin.ReleaseMode)
+
+`)
+}
+
+func debugPrintWARNINGSetHTMLTemplate() {
+	debugPrint(`[WARNING] Since SetHTMLTemplate() is NOT thread-safe. It should only be called
+at initialization. ie. before any route is registered or the router is listening in a socket:
+
+	router := gin.Default()
+	router.SetHTMLTemplate(template) // << good place
+
+`)
+}
+
+func debugPrintError(err error) {
+	if err != nil {
+		debugPrint("[ERROR] %v\n", err)
+	}
+}

backend/vendor/github.com/gin-gonic/gin/deprecated.go

@@ -0,0 +1,21 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import (
+	"log"
+
+	"github.com/gin-gonic/gin/binding"
+)
+
+// BindWith binds the passed struct pointer using the specified binding engine.
+// See the binding package.
+func (c *Context) BindWith(obj interface{}, b binding.Binding) error {
+	log.Println(`BindWith(\"interface{}, binding.Binding\") error is going to
+	be deprecated, please check issue #662 and either use MustBindWith() if you
+	want HTTP 400 to be automatically returned if any error occur, or use
+	ShouldBindWith() if you need to manage the error.`)
+	return c.MustBindWith(obj, b)
+}

backend/vendor/github.com/gin-gonic/gin/doc.go

@@ -0,0 +1,6 @@
+/*
+Package gin implements a HTTP web framework called gin.
+
+See https://gin-gonic.com/ for more information about gin.
+*/
+package gin // import "github.com/gin-gonic/gin"

backend/vendor/github.com/gin-gonic/gin/errors.go

@@ -0,0 +1,169 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import (
+	"bytes"
+	"fmt"
+	"reflect"
+
+	"github.com/gin-gonic/gin/internal/json"
+)
+
+// ErrorType is an unsigned 64-bit error code as defined in the gin spec.
+type ErrorType uint64
+
+const (
+	// ErrorTypeBind is used when Context.Bind() fails.
+	ErrorTypeBind ErrorType = 1 << 63
+	// ErrorTypeRender is used when Context.Render() fails.
+	ErrorTypeRender ErrorType = 1 << 62
+	// ErrorTypePrivate indicates a private error.
+	ErrorTypePrivate ErrorType = 1 << 0
+	// ErrorTypePublic indicates a public error.
+	ErrorTypePublic ErrorType = 1 << 1
+	// ErrorTypeAny indicates any other error.
+	ErrorTypeAny ErrorType = 1<<64 - 1
+	// ErrorTypeNu indicates any other error.
+	ErrorTypeNu = 2
+)
+
+// Error represents a error's specification.
+type Error struct {
+	Err  error
+	Type ErrorType
+	Meta interface{}
+}
+
+type errorMsgs []*Error
+
+var _ error = &Error{}
+
+// SetType sets the error's type.
+func (msg *Error) SetType(flags ErrorType) *Error {
+	msg.Type = flags
+	return msg
+}
+
+// SetMeta sets the error's meta data.
+func (msg *Error) SetMeta(data interface{}) *Error {
+	msg.Meta = data
+	return msg
+}
+
+// JSON creates a properly formatted JSON
+func (msg *Error) JSON() interface{} {
+	json := H{}
+	if msg.Meta != nil {
+		value := reflect.ValueOf(msg.Meta)
+		switch value.Kind() {
+		case reflect.Struct:
+			return msg.Meta
+		case reflect.Map:
+			for _, key := range value.MapKeys() {
+				json[key.String()] = value.MapIndex(key).Interface()
+			}
+		default:
+			json["meta"] = msg.Meta
+		}
+	}
+	if _, ok := json["error"]; !ok {
+		json["error"] = msg.Error()
+	}
+	return json
+}
+
+// MarshalJSON implements the json.Marshaller interface.
+func (msg *Error) MarshalJSON() ([]byte, error) {
+	return json.Marshal(msg.JSON())
+}
+
+// Error implements the error interface.
+func (msg Error) Error() string {
+	return msg.Err.Error()
+}
+
+// IsType judges one error.
+func (msg *Error) IsType(flags ErrorType) bool {
+	return (msg.Type & flags) > 0
+}
+
+// ByType returns a readonly copy filtered the byte.
+// ie ByType(gin.ErrorTypePublic) returns a slice of errors with type=ErrorTypePublic.
+func (a errorMsgs) ByType(typ ErrorType) errorMsgs {
+	if len(a) == 0 {
+		return nil
+	}
+	if typ == ErrorTypeAny {
+		return a
+	}
+	var result errorMsgs
+	for _, msg := range a {
+		if msg.IsType(typ) {
+			result = append(result, msg)
+		}
+	}
+	return result
+}
+
+// Last returns the last error in the slice. It returns nil if the array is empty.
+// Shortcut for errors[len(errors)-1].
+func (a errorMsgs) Last() *Error {
+	if length := len(a); length > 0 {
+		return a[length-1]
+	}
+	return nil
+}
+
+// Errors returns an array will all the error messages.
+// Example:
+// 		c.Error(errors.New("first"))
+// 		c.Error(errors.New("second"))
+// 		c.Error(errors.New("third"))
+// 		c.Errors.Errors() // == []string{"first", "second", "third"}
+func (a errorMsgs) Errors() []string {
+	if len(a) == 0 {
+		return nil
+	}
+	errorStrings := make([]string, len(a))
+	for i, err := range a {
+		errorStrings[i] = err.Error()
+	}
+	return errorStrings
+}
+
+func (a errorMsgs) JSON() interface{} {
+	switch len(a) {
+	case 0:
+		return nil
+	case 1:
+		return a.Last().JSON()
+	default:
+		json := make([]interface{}, len(a))
+		for i, err := range a {
+			json[i] = err.JSON()
+		}
+		return json
+	}
+}
+
+// MarshalJSON implements the json.Marshaller interface.
+func (a errorMsgs) MarshalJSON() ([]byte, error) {
+	return json.Marshal(a.JSON())
+}
+
+func (a errorMsgs) String() string {
+	if len(a) == 0 {
+		return ""
+	}
+	var buffer bytes.Buffer
+	for i, msg := range a {
+		fmt.Fprintf(&buffer, "Error #%02d: %s\n", i+1, msg.Err)
+		if msg.Meta != nil {
+			fmt.Fprintf(&buffer, "     Meta: %v\n", msg.Meta)
+		}
+	}
+	return buffer.String()
+}

backend/vendor/github.com/gin-gonic/gin/fs.go

@@ -0,0 +1,45 @@
+// Copyright 2017 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import (
+	"net/http"
+	"os"
+)
+
+type onlyfilesFS struct {
+	fs http.FileSystem
+}
+
+type neuteredReaddirFile struct {
+	http.File
+}
+
+// Dir returns a http.Filesystem that can be used by http.FileServer(). It is used internally
+// in router.Static().
+// if listDirectory == true, then it works the same as http.Dir() otherwise it returns
+// a filesystem that prevents http.FileServer() to list the directory files.
+func Dir(root string, listDirectory bool) http.FileSystem {
+	fs := http.Dir(root)
+	if listDirectory {
+		return fs
+	}
+	return &onlyfilesFS{fs}
+}
+
+// Open conforms to http.Filesystem.
+func (fs onlyfilesFS) Open(name string) (http.File, error) {
+	f, err := fs.fs.Open(name)
+	if err != nil {
+		return nil, err
+	}
+	return neuteredReaddirFile{f}, nil
+}
+
+// Readdir overrides the http.File default implementation.
+func (f neuteredReaddirFile) Readdir(count int) ([]os.FileInfo, error) {
+	// this disables directory listing
+	return nil, nil
+}

backend/vendor/github.com/gin-gonic/gin/gin.go

@@ -0,0 +1,477 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import (
+	"fmt"
+	"html/template"
+	"net"
+	"net/http"
+	"os"
+	"path"
+	"sync"
+
+	"github.com/gin-gonic/gin/render"
+)
+
+const defaultMultipartMemory = 32 << 20 // 32 MB
+
+var (
+	default404Body   = []byte("404 page not found")
+	default405Body   = []byte("405 method not allowed")
+	defaultAppEngine bool
+)
+
+// HandlerFunc defines the handler used by gin middleware as return value.
+type HandlerFunc func(*Context)
+
+// HandlersChain defines a HandlerFunc array.
+type HandlersChain []HandlerFunc
+
+// Last returns the last handler in the chain. ie. the last handler is the main own.
+func (c HandlersChain) Last() HandlerFunc {
+	if length := len(c); length > 0 {
+		return c[length-1]
+	}
+	return nil
+}
+
+// RouteInfo represents a request route's specification which contains method and path and its handler.
+type RouteInfo struct {
+	Method      string
+	Path        string
+	Handler     string
+	HandlerFunc HandlerFunc
+}
+
+// RoutesInfo defines a RouteInfo array.
+type RoutesInfo []RouteInfo
+
+// Engine is the framework's instance, it contains the muxer, middleware and configuration settings.
+// Create an instance of Engine, by using New() or Default()
+type Engine struct {
+	RouterGroup
+
+	// Enables automatic redirection if the current route can't be matched but a
+	// handler for the path with (without) the trailing slash exists.
+	// For example if /foo/ is requested but a route only exists for /foo, the
+	// client is redirected to /foo with http status code 301 for GET requests
+	// and 307 for all other request methods.
+	RedirectTrailingSlash bool
+
+	// If enabled, the router tries to fix the current request path, if no
+	// handle is registered for it.
+	// First superfluous path elements like ../ or // are removed.
+	// Afterwards the router does a case-insensitive lookup of the cleaned path.
+	// If a handle can be found for this route, the router makes a redirection
+	// to the corrected path with status code 301 for GET requests and 307 for
+	// all other request methods.
+	// For example /FOO and /..//Foo could be redirected to /foo.
+	// RedirectTrailingSlash is independent of this option.
+	RedirectFixedPath bool
+
+	// If enabled, the router checks if another method is allowed for the
+	// current route, if the current request can not be routed.
+	// If this is the case, the request is answered with 'Method Not Allowed'
+	// and HTTP status code 405.
+	// If no other Method is allowed, the request is delegated to the NotFound
+	// handler.
+	HandleMethodNotAllowed bool
+	ForwardedByClientIP    bool
+
+	// #726 #755 If enabled, it will thrust some headers starting with
+	// 'X-AppEngine...' for better integration with that PaaS.
+	AppEngine bool
+
+	// If enabled, the url.RawPath will be used to find parameters.
+	UseRawPath bool
+
+	// If true, the path value will be unescaped.
+	// If UseRawPath is false (by default), the UnescapePathValues effectively is true,
+	// as url.Path gonna be used, which is already unescaped.
+	UnescapePathValues bool
+
+	// Value of 'maxMemory' param that is given to http.Request's ParseMultipartForm
+	// method call.
+	MaxMultipartMemory int64
+
+	delims           render.Delims
+	secureJsonPrefix string
+	HTMLRender       render.HTMLRender
+	FuncMap          template.FuncMap
+	allNoRoute       HandlersChain
+	allNoMethod      HandlersChain
+	noRoute          HandlersChain
+	noMethod         HandlersChain
+	pool             sync.Pool
+	trees            methodTrees
+}
+
+var _ IRouter = &Engine{}
+
+// New returns a new blank Engine instance without any middleware attached.
+// By default the configuration is:
+// - RedirectTrailingSlash:  true
+// - RedirectFixedPath:      false
+// - HandleMethodNotAllowed: false
+// - ForwardedByClientIP:    true
+// - UseRawPath:             false
+// - UnescapePathValues:     true
+func New() *Engine {
+	debugPrintWARNINGNew()
+	engine := &Engine{
+		RouterGroup: RouterGroup{
+			Handlers: nil,
+			basePath: "/",
+			root:     true,
+		},
+		FuncMap:                template.FuncMap{},
+		RedirectTrailingSlash:  true,
+		RedirectFixedPath:      false,
+		HandleMethodNotAllowed: false,
+		ForwardedByClientIP:    true,
+		AppEngine:              defaultAppEngine,
+		UseRawPath:             false,
+		UnescapePathValues:     true,
+		MaxMultipartMemory:     defaultMultipartMemory,
+		trees:                  make(methodTrees, 0, 9),
+		delims:                 render.Delims{Left: "{{", Right: "}}"},
+		secureJsonPrefix:       "while(1);",
+	}
+	engine.RouterGroup.engine = engine
+	engine.pool.New = func() interface{} {
+		return engine.allocateContext()
+	}
+	return engine
+}
+
+// Default returns an Engine instance with the Logger and Recovery middleware already attached.
+func Default() *Engine {
+	debugPrintWARNINGDefault()
+	engine := New()
+	engine.Use(Logger(), Recovery())
+	return engine
+}
+
+func (engine *Engine) allocateContext() *Context {
+	return &Context{engine: engine}
+}
+
+// Delims sets template left and right delims and returns a Engine instance.
+func (engine *Engine) Delims(left, right string) *Engine {
+	engine.delims = render.Delims{Left: left, Right: right}
+	return engine
+}
+
+// SecureJsonPrefix sets the secureJsonPrefix used in Context.SecureJSON.
+func (engine *Engine) SecureJsonPrefix(prefix string) *Engine {
+	engine.secureJsonPrefix = prefix
+	return engine
+}
+
+// LoadHTMLGlob loads HTML files identified by glob pattern
+// and associates the result with HTML renderer.
+func (engine *Engine) LoadHTMLGlob(pattern string) {
+	left := engine.delims.Left
+	right := engine.delims.Right
+	templ := template.Must(template.New("").Delims(left, right).Funcs(engine.FuncMap).ParseGlob(pattern))
+
+	if IsDebugging() {
+		debugPrintLoadTemplate(templ)
+		engine.HTMLRender = render.HTMLDebug{Glob: pattern, FuncMap: engine.FuncMap, Delims: engine.delims}
+		return
+	}
+
+	engine.SetHTMLTemplate(templ)
+}
+
+// LoadHTMLFiles loads a slice of HTML files
+// and associates the result with HTML renderer.
+func (engine *Engine) LoadHTMLFiles(files ...string) {
+	if IsDebugging() {
+		engine.HTMLRender = render.HTMLDebug{Files: files, FuncMap: engine.FuncMap, Delims: engine.delims}
+		return
+	}
+
+	templ := template.Must(template.New("").Delims(engine.delims.Left, engine.delims.Right).Funcs(engine.FuncMap).ParseFiles(files...))
+	engine.SetHTMLTemplate(templ)
+}
+
+// SetHTMLTemplate associate a template with HTML renderer.
+func (engine *Engine) SetHTMLTemplate(templ *template.Template) {
+	if len(engine.trees) > 0 {
+		debugPrintWARNINGSetHTMLTemplate()
+	}
+
+	engine.HTMLRender = render.HTMLProduction{Template: templ.Funcs(engine.FuncMap)}
+}
+
+// SetFuncMap sets the FuncMap used for template.FuncMap.
+func (engine *Engine) SetFuncMap(funcMap template.FuncMap) {
+	engine.FuncMap = funcMap
+}
+
+// NoRoute adds handlers for NoRoute. It return a 404 code by default.
+func (engine *Engine) NoRoute(handlers ...HandlerFunc) {
+	engine.noRoute = handlers
+	engine.rebuild404Handlers()
+}
+
+// NoMethod sets the handlers called when... TODO.
+func (engine *Engine) NoMethod(handlers ...HandlerFunc) {
+	engine.noMethod = handlers
+	engine.rebuild405Handlers()
+}
+
+// Use attaches a global middleware to the router. ie. the middleware attached though Use() will be
+// included in the handlers chain for every single request. Even 404, 405, static files...
+// For example, this is the right place for a logger or error management middleware.
+func (engine *Engine) Use(middleware ...HandlerFunc) IRoutes {
+	engine.RouterGroup.Use(middleware...)
+	engine.rebuild404Handlers()
+	engine.rebuild405Handlers()
+	return engine
+}
+
+func (engine *Engine) rebuild404Handlers() {
+	engine.allNoRoute = engine.combineHandlers(engine.noRoute)
+}
+
+func (engine *Engine) rebuild405Handlers() {
+	engine.allNoMethod = engine.combineHandlers(engine.noMethod)
+}
+
+func (engine *Engine) addRoute(method, path string, handlers HandlersChain) {
+	assert1(path[0] == '/', "path must begin with '/'")
+	assert1(method != "", "HTTP method can not be empty")
+	assert1(len(handlers) > 0, "there must be at least one handler")
+
+	debugPrintRoute(method, path, handlers)
+	root := engine.trees.get(method)
+	if root == nil {
+		root = new(node)
+		engine.trees = append(engine.trees, methodTree{method: method, root: root})
+	}
+	root.addRoute(path, handlers)
+}
+
+// Routes returns a slice of registered routes, including some useful information, such as:
+// the http method, path and the handler name.
+func (engine *Engine) Routes() (routes RoutesInfo) {
+	for _, tree := range engine.trees {
+		routes = iterate("", tree.method, routes, tree.root)
+	}
+	return routes
+}
+
+func iterate(path, method string, routes RoutesInfo, root *node) RoutesInfo {
+	path += root.path
+	if len(root.handlers) > 0 {
+		handlerFunc := root.handlers.Last()
+		routes = append(routes, RouteInfo{
+			Method:      method,
+			Path:        path,
+			Handler:     nameOfFunction(handlerFunc),
+			HandlerFunc: handlerFunc,
+		})
+	}
+	for _, child := range root.children {
+		routes = iterate(path, method, routes, child)
+	}
+	return routes
+}
+
+// Run attaches the router to a http.Server and starts listening and serving HTTP requests.
+// It is a shortcut for http.ListenAndServe(addr, router)
+// Note: this method will block the calling goroutine indefinitely unless an error happens.
+func (engine *Engine) Run(addr ...string) (err error) {
+	defer func() { debugPrintError(err) }()
+
+	address := resolveAddress(addr)
+	debugPrint("Listening and serving HTTP on %s\n", address)
+	err = http.ListenAndServe(address, engine)
+	return
+}
+
+// RunTLS attaches the router to a http.Server and starts listening and serving HTTPS (secure) requests.
+// It is a shortcut for http.ListenAndServeTLS(addr, certFile, keyFile, router)
+// Note: this method will block the calling goroutine indefinitely unless an error happens.
+func (engine *Engine) RunTLS(addr, certFile, keyFile string) (err error) {
+	debugPrint("Listening and serving HTTPS on %s\n", addr)
+	defer func() { debugPrintError(err) }()
+
+	err = http.ListenAndServeTLS(addr, certFile, keyFile, engine)
+	return
+}
+
+// RunUnix attaches the router to a http.Server and starts listening and serving HTTP requests
+// through the specified unix socket (ie. a file).
+// Note: this method will block the calling goroutine indefinitely unless an error happens.
+func (engine *Engine) RunUnix(file string) (err error) {
+	debugPrint("Listening and serving HTTP on unix:/%s", file)
+	defer func() { debugPrintError(err) }()
+
+	os.Remove(file)
+	listener, err := net.Listen("unix", file)
+	if err != nil {
+		return
+	}
+	defer listener.Close()
+	os.Chmod(file, 0777)
+	err = http.Serve(listener, engine)
+	return
+}
+
+// RunFd attaches the router to a http.Server and starts listening and serving HTTP requests
+// through the specified file descriptor.
+// Note: this method will block the calling goroutine indefinitely unless an error happens.
+func (engine *Engine) RunFd(fd int) (err error) {
+	debugPrint("Listening and serving HTTP on fd@%d", fd)
+	defer func() { debugPrintError(err) }()
+
+	f := os.NewFile(uintptr(fd), fmt.Sprintf("fd@%d", fd))
+	listener, err := net.FileListener(f)
+	if err != nil {
+		return
+	}
+	defer listener.Close()
+	err = http.Serve(listener, engine)
+	return
+}
+
+// ServeHTTP conforms to the http.Handler interface.
+func (engine *Engine) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	c := engine.pool.Get().(*Context)
+	c.writermem.reset(w)
+	c.Request = req
+	c.reset()
+
+	engine.handleHTTPRequest(c)
+
+	engine.pool.Put(c)
+}
+
+// HandleContext re-enter a context that has been rewritten.
+// This can be done by setting c.Request.URL.Path to your new target.
+// Disclaimer: You can loop yourself to death with this, use wisely.
+func (engine *Engine) HandleContext(c *Context) {
+	oldIndexValue := c.index
+	c.reset()
+	engine.handleHTTPRequest(c)
+
+	c.index = oldIndexValue
+}
+
+func (engine *Engine) handleHTTPRequest(c *Context) {
+	httpMethod := c.Request.Method
+	rPath := c.Request.URL.Path
+	unescape := false
+	if engine.UseRawPath && len(c.Request.URL.RawPath) > 0 {
+		rPath = c.Request.URL.RawPath
+		unescape = engine.UnescapePathValues
+	}
+	rPath = cleanPath(rPath)
+
+	// Find root of the tree for the given HTTP method
+	t := engine.trees
+	for i, tl := 0, len(t); i < tl; i++ {
+		if t[i].method != httpMethod {
+			continue
+		}
+		root := t[i].root
+		// Find route in tree
+		handlers, params, tsr := root.getValue(rPath, c.Params, unescape)
+		if handlers != nil {
+			c.handlers = handlers
+			c.Params = params
+			c.Next()
+			c.writermem.WriteHeaderNow()
+			return
+		}
+		if httpMethod != "CONNECT" && rPath != "/" {
+			if tsr && engine.RedirectTrailingSlash {
+				redirectTrailingSlash(c)
+				return
+			}
+			if engine.RedirectFixedPath && redirectFixedPath(c, root, engine.RedirectFixedPath) {
+				return
+			}
+		}
+		break
+	}
+
+	if engine.HandleMethodNotAllowed {
+		for _, tree := range engine.trees {
+			if tree.method == httpMethod {
+				continue
+			}
+			if handlers, _, _ := tree.root.getValue(rPath, nil, unescape); handlers != nil {
+				c.handlers = engine.allNoMethod
+				serveError(c, http.StatusMethodNotAllowed, default405Body)
+				return
+			}
+		}
+	}
+	c.handlers = engine.allNoRoute
+	serveError(c, http.StatusNotFound, default404Body)
+}
+
+var mimePlain = []string{MIMEPlain}
+
+func serveError(c *Context, code int, defaultMessage []byte) {
+	c.writermem.status = code
+	c.Next()
+	if c.writermem.Written() {
+		return
+	}
+	if c.writermem.Status() == code {
+		c.writermem.Header()["Content-Type"] = mimePlain
+		_, err := c.Writer.Write(defaultMessage)
+		if err != nil {
+			debugPrint("cannot write message to writer during serve error: %v", err)
+		}
+		return
+	}
+	c.writermem.WriteHeaderNow()
+	return
+}
+
+func redirectTrailingSlash(c *Context) {
+	req := c.Request
+	p := req.URL.Path
+	if prefix := path.Clean(c.Request.Header.Get("X-Forwarded-Prefix")); prefix != "." {
+		p = prefix + "/" + req.URL.Path
+	}
+	code := http.StatusMovedPermanently // Permanent redirect, request with GET method
+	if req.Method != "GET" {
+		code = http.StatusTemporaryRedirect
+	}
+
+	req.URL.Path = p + "/"
+	if length := len(p); length > 1 && p[length-1] == '/' {
+		req.URL.Path = p[:length-1]
+	}
+	debugPrint("redirecting request %d: %s --> %s", code, p, req.URL.String())
+	http.Redirect(c.Writer, req, req.URL.String(), code)
+	c.writermem.WriteHeaderNow()
+}
+
+func redirectFixedPath(c *Context, root *node, trailingSlash bool) bool {
+	req := c.Request
+	rPath := req.URL.Path
+
+	if fixedPath, ok := root.findCaseInsensitivePath(cleanPath(rPath), trailingSlash); ok {
+		code := http.StatusMovedPermanently // Permanent redirect, request with GET method
+		if req.Method != "GET" {
+			code = http.StatusTemporaryRedirect
+		}
+		req.URL.Path = string(fixedPath)
+		debugPrint("redirecting request %d: %s --> %s", code, rPath, req.URL.String())
+		http.Redirect(c.Writer, req, req.URL.String(), code)
+		c.writermem.WriteHeaderNow()
+		return true
+	}
+	return false
+}

backend/vendor/github.com/gin-gonic/gin/go.mod

@@ -0,0 +1,18 @@
+module github.com/gin-gonic/gin
+
+go 1.12
+
+require (
+	github.com/gin-contrib/sse v0.0.0-20190301062529-5545eab6dad3
+	github.com/golang/protobuf v1.3.1
+	github.com/json-iterator/go v1.1.6
+	github.com/mattn/go-isatty v0.0.7
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.1 // indirect
+	github.com/stretchr/testify v1.3.0
+	github.com/ugorji/go v1.1.4
+	golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c
+	gopkg.in/go-playground/assert.v1 v1.2.1 // indirect
+	gopkg.in/go-playground/validator.v8 v8.18.2
+	gopkg.in/yaml.v2 v2.2.2
+)

backend/vendor/github.com/gin-gonic/gin/go.sum

@@ -0,0 +1,36 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/gin-contrib/sse v0.0.0-20190301062529-5545eab6dad3 h1:t8FVkw33L+wilf2QiWkw0UV77qRpcH/JHPKGpKa2E8g=
+github.com/gin-contrib/sse v0.0.0-20190301062529-5545eab6dad3/go.mod h1:VJ0WA2NBN22VlZ2dKZQPAPnyWw5XTlK1KymzLKsr59s=
+github.com/golang/protobuf v1.3.1 h1:YF8+flBXS5eO826T4nzqPrxfhQThhXl0YzfuUPu4SBg=
+github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/json-iterator/go v1.1.6 h1:MrUvLMLTMxbqFJ9kzlvat/rYZqZnW3u4wkLzWTaFwKs=
+github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
+github.com/mattn/go-isatty v0.0.7 h1:UvyT9uN+3r7yLEYSlJsbQGdsaB/a0DlgWP3pql6iwOc=
+github.com/mattn/go-isatty v0.0.7/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
+github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
+github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
+github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9AWI=
+github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/ugorji/go v1.1.4 h1:j4s+tAvLfL3bZyefP2SEWmhBzmuIlH/eqNuPdFPgngw=
+github.com/ugorji/go v1.1.4/go.mod h1:uQMGLiO92mf5W77hV/PUCpI3pbzQx3CRekS0kk+RGrc=
+golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
+golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c h1:uOCk1iQW6Vc18bnC13MfzScl+wdKBmM9Y9kU7Z83/lw=
+golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223 h1:DH4skfRX4EBpamg7iV4ZlCpblAHI6s6TDM39bFZumv8=
+golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/go-playground/assert.v1 v1.2.1 h1:xoYuJVE7KT85PYWrN730RguIQO0ePzVRfFMXadIrXTM=
+gopkg.in/go-playground/assert.v1 v1.2.1/go.mod h1:9RXL0bg/zibRAgZUYszZSwO/z8Y/a8bDuhia5mkpMnE=
+gopkg.in/go-playground/validator.v8 v8.18.2 h1:lFB4DoMU6B626w8ny76MV7VX6W2VHct2GVOI3xgiMrQ=
+gopkg.in/go-playground/validator.v8 v8.18.2/go.mod h1:RX2a/7Ha8BgOhfk7j780h4/u/RRjR0eouCJSH80/M2Y=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

backend/vendor/github.com/gin-gonic/gin/internal/json/json.go

@@ -0,0 +1,22 @@
+// Copyright 2017 Bo-Yi Wu.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+// +build !jsoniter
+
+package json
+
+import "encoding/json"
+
+var (
+	// Marshal is exported by gin/json package.
+	Marshal = json.Marshal
+	// Unmarshal is exported by gin/json package.
+	Unmarshal = json.Unmarshal
+	// MarshalIndent is exported by gin/json package.
+	MarshalIndent = json.MarshalIndent
+	// NewDecoder is exported by gin/json package.
+	NewDecoder = json.NewDecoder
+	// NewEncoder is exported by gin/json package.
+	NewEncoder = json.NewEncoder
+)

backend/vendor/github.com/gin-gonic/gin/internal/json/jsoniter.go

@@ -0,0 +1,23 @@
+// Copyright 2017 Bo-Yi Wu.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+// +build jsoniter
+
+package json
+
+import "github.com/json-iterator/go"
+
+var (
+	json = jsoniter.ConfigCompatibleWithStandardLibrary
+	// Marshal is exported by gin/json package.
+	Marshal = json.Marshal
+	// Unmarshal is exported by gin/json package.
+	Unmarshal = json.Unmarshal
+	// MarshalIndent is exported by gin/json package.
+	MarshalIndent = json.MarshalIndent
+	// NewDecoder is exported by gin/json package.
+	NewDecoder = json.NewDecoder
+	// NewEncoder is exported by gin/json package.
+	NewEncoder = json.NewEncoder
+)

backend/vendor/github.com/gin-gonic/gin/logger.go

@@ -0,0 +1,270 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/mattn/go-isatty"
+)
+
+type consoleColorModeValue int
+
+const (
+	autoColor consoleColorModeValue = iota
+	disableColor
+	forceColor
+)
+
+var (
+	green            = string([]byte{27, 91, 57, 55, 59, 52, 50, 109})
+	white            = string([]byte{27, 91, 57, 48, 59, 52, 55, 109})
+	yellow           = string([]byte{27, 91, 57, 48, 59, 52, 51, 109})
+	red              = string([]byte{27, 91, 57, 55, 59, 52, 49, 109})
+	blue             = string([]byte{27, 91, 57, 55, 59, 52, 52, 109})
+	magenta          = string([]byte{27, 91, 57, 55, 59, 52, 53, 109})
+	cyan             = string([]byte{27, 91, 57, 55, 59, 52, 54, 109})
+	reset            = string([]byte{27, 91, 48, 109})
+	consoleColorMode = autoColor
+)
+
+// LoggerConfig defines the config for Logger middleware.
+type LoggerConfig struct {
+	// Optional. Default value is gin.defaultLogFormatter
+	Formatter LogFormatter
+
+	// Output is a writer where logs are written.
+	// Optional. Default value is gin.DefaultWriter.
+	Output io.Writer
+
+	// SkipPaths is a url path array which logs are not written.
+	// Optional.
+	SkipPaths []string
+}
+
+// LogFormatter gives the signature of the formatter function passed to LoggerWithFormatter
+type LogFormatter func(params LogFormatterParams) string
+
+// LogFormatterParams is the structure any formatter will be handed when time to log comes
+type LogFormatterParams struct {
+	Request *http.Request
+
+	// TimeStamp shows the time after the server returns a response.
+	TimeStamp time.Time
+	// StatusCode is HTTP response code.
+	StatusCode int
+	// Latency is how much time the server cost to process a certain request.
+	Latency time.Duration
+	// ClientIP equals Context's ClientIP method.
+	ClientIP string
+	// Method is the HTTP method given to the request.
+	Method string
+	// Path is a path the client requests.
+	Path string
+	// ErrorMessage is set if error has occurred in processing the request.
+	ErrorMessage string
+	// isTerm shows whether does gin's output descriptor refers to a terminal.
+	isTerm bool
+	// BodySize is the size of the Response Body
+	BodySize int
+	// Keys are the keys set on the request's context.
+	Keys map[string]interface{}
+}
+
+// StatusCodeColor is the ANSI color for appropriately logging http status code to a terminal.
+func (p *LogFormatterParams) StatusCodeColor() string {
+	code := p.StatusCode
+
+	switch {
+	case code >= http.StatusOK && code < http.StatusMultipleChoices:
+		return green
+	case code >= http.StatusMultipleChoices && code < http.StatusBadRequest:
+		return white
+	case code >= http.StatusBadRequest && code < http.StatusInternalServerError:
+		return yellow
+	default:
+		return red
+	}
+}
+
+// MethodColor is the ANSI color for appropriately logging http method to a terminal.
+func (p *LogFormatterParams) MethodColor() string {
+	method := p.Method
+
+	switch method {
+	case "GET":
+		return blue
+	case "POST":
+		return cyan
+	case "PUT":
+		return yellow
+	case "DELETE":
+		return red
+	case "PATCH":
+		return green
+	case "HEAD":
+		return magenta
+	case "OPTIONS":
+		return white
+	default:
+		return reset
+	}
+}
+
+// ResetColor resets all escape attributes.
+func (p *LogFormatterParams) ResetColor() string {
+	return reset
+}
+
+// IsOutputColor indicates whether can colors be outputted to the log.
+func (p *LogFormatterParams) IsOutputColor() bool {
+	return consoleColorMode == forceColor || (consoleColorMode == autoColor && p.isTerm)
+}
+
+// defaultLogFormatter is the default log format function Logger middleware uses.
+var defaultLogFormatter = func(param LogFormatterParams) string {
+	var statusColor, methodColor, resetColor string
+	if param.IsOutputColor() {
+		statusColor = param.StatusCodeColor()
+		methodColor = param.MethodColor()
+		resetColor = param.ResetColor()
+	}
+
+	if param.Latency > time.Minute {
+		// Truncate in a golang < 1.8 safe way
+		param.Latency = param.Latency - param.Latency%time.Second
+	}
+	return fmt.Sprintf("[GIN] %v |%s %3d %s| %13v | %15s |%s %-7s %s %s\n%s",
+		param.TimeStamp.Format("2006/01/02 - 15:04:05"),
+		statusColor, param.StatusCode, resetColor,
+		param.Latency,
+		param.ClientIP,
+		methodColor, param.Method, resetColor,
+		param.Path,
+		param.ErrorMessage,
+	)
+}
+
+// DisableConsoleColor disables color output in the console.
+func DisableConsoleColor() {
+	consoleColorMode = disableColor
+}
+
+// ForceConsoleColor force color output in the console.
+func ForceConsoleColor() {
+	consoleColorMode = forceColor
+}
+
+// ErrorLogger returns a handlerfunc for any error type.
+func ErrorLogger() HandlerFunc {
+	return ErrorLoggerT(ErrorTypeAny)
+}
+
+// ErrorLoggerT returns a handlerfunc for a given error type.
+func ErrorLoggerT(typ ErrorType) HandlerFunc {
+	return func(c *Context) {
+		c.Next()
+		errors := c.Errors.ByType(typ)
+		if len(errors) > 0 {
+			c.JSON(-1, errors)
+		}
+	}
+}
+
+// Logger instances a Logger middleware that will write the logs to gin.DefaultWriter.
+// By default gin.DefaultWriter = os.Stdout.
+func Logger() HandlerFunc {
+	return LoggerWithConfig(LoggerConfig{})
+}
+
+// LoggerWithFormatter instance a Logger middleware with the specified log format function.
+func LoggerWithFormatter(f LogFormatter) HandlerFunc {
+	return LoggerWithConfig(LoggerConfig{
+		Formatter: f,
+	})
+}
+
+// LoggerWithWriter instance a Logger middleware with the specified writer buffer.
+// Example: os.Stdout, a file opened in write mode, a socket...
+func LoggerWithWriter(out io.Writer, notlogged ...string) HandlerFunc {
+	return LoggerWithConfig(LoggerConfig{
+		Output:    out,
+		SkipPaths: notlogged,
+	})
+}
+
+// LoggerWithConfig instance a Logger middleware with config.
+func LoggerWithConfig(conf LoggerConfig) HandlerFunc {
+	formatter := conf.Formatter
+	if formatter == nil {
+		formatter = defaultLogFormatter
+	}
+
+	out := conf.Output
+	if out == nil {
+		out = DefaultWriter
+	}
+
+	notlogged := conf.SkipPaths
+
+	isTerm := true
+
+	if w, ok := out.(*os.File); !ok || os.Getenv("TERM") == "dumb" ||
+		(!isatty.IsTerminal(w.Fd()) && !isatty.IsCygwinTerminal(w.Fd())) {
+		isTerm = false
+	}
+
+	var skip map[string]struct{}
+
+	if length := len(notlogged); length > 0 {
+		skip = make(map[string]struct{}, length)
+
+		for _, path := range notlogged {
+			skip[path] = struct{}{}
+		}
+	}
+
+	return func(c *Context) {
+		// Start timer
+		start := time.Now()
+		path := c.Request.URL.Path
+		raw := c.Request.URL.RawQuery
+
+		// Process request
+		c.Next()
+
+		// Log only when path is not being skipped
+		if _, ok := skip[path]; !ok {
+			param := LogFormatterParams{
+				Request: c.Request,
+				isTerm:  isTerm,
+				Keys:    c.Keys,
+			}
+
+			// Stop timer
+			param.TimeStamp = time.Now()
+			param.Latency = param.TimeStamp.Sub(start)
+
+			param.ClientIP = c.ClientIP()
+			param.Method = c.Request.Method
+			param.StatusCode = c.Writer.Status()
+			param.ErrorMessage = c.Errors.ByType(ErrorTypePrivate).String()
+
+			param.BodySize = c.Writer.Size()
+
+			if raw != "" {
+				path = path + "?" + raw
+			}
+
+			param.Path = path
+
+			fmt.Fprint(out, formatter(param))
+		}
+	}
+}

backend/vendor/github.com/gin-gonic/gin/mode.go

@@ -0,0 +1,83 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import (
+	"io"
+	"os"
+
+	"github.com/gin-gonic/gin/binding"
+)
+
+// EnvGinMode indicates environment name for gin mode.
+const EnvGinMode = "GIN_MODE"
+
+const (
+	// DebugMode indicates gin mode is debug.
+	DebugMode = "debug"
+	// ReleaseMode indicates gin mode is release.
+	ReleaseMode = "release"
+	// TestMode indicates gin mode is test.
+	TestMode = "test"
+)
+const (
+	debugCode = iota
+	releaseCode
+	testCode
+)
+
+// DefaultWriter is the default io.Writer used by Gin for debug output and
+// middleware output like Logger() or Recovery().
+// Note that both Logger and Recovery provides custom ways to configure their
+// output io.Writer.
+// To support coloring in Windows use:
+// 		import "github.com/mattn/go-colorable"
+// 		gin.DefaultWriter = colorable.NewColorableStdout()
+var DefaultWriter io.Writer = os.Stdout
+
+// DefaultErrorWriter is the default io.Writer used by Gin to debug errors
+var DefaultErrorWriter io.Writer = os.Stderr
+
+var ginMode = debugCode
+var modeName = DebugMode
+
+func init() {
+	mode := os.Getenv(EnvGinMode)
+	SetMode(mode)
+}
+
+// SetMode sets gin mode according to input string.
+func SetMode(value string) {
+	switch value {
+	case DebugMode, "":
+		ginMode = debugCode
+	case ReleaseMode:
+		ginMode = releaseCode
+	case TestMode:
+		ginMode = testCode
+	default:
+		panic("gin mode unknown: " + value)
+	}
+	if value == "" {
+		value = DebugMode
+	}
+	modeName = value
+}
+
+// DisableBindValidation closes the default validator.
+func DisableBindValidation() {
+	binding.Validator = nil
+}
+
+// EnableJsonDecoderUseNumber sets true for binding.EnableDecoderUseNumberto to
+// call the UseNumber method on the JSON Decoder instance.
+func EnableJsonDecoderUseNumber() {
+	binding.EnableDecoderUseNumber = true
+}
+
+// Mode returns currently gin mode.
+func Mode() string {
+	return modeName
+}

backend/vendor/github.com/gin-gonic/gin/path.go

@@ -0,0 +1,123 @@
+// Copyright 2013 Julien Schmidt. All rights reserved.
+// Based on the path package, Copyright 2009 The Go Authors.
+// Use of this source code is governed by a BSD-style license that can be found
+// at https://github.com/julienschmidt/httprouter/blob/master/LICENSE.
+
+package gin
+
+// cleanPath is the URL version of path.Clean, it returns a canonical URL path
+// for p, eliminating . and .. elements.
+//
+// The following rules are applied iteratively until no further processing can
+// be done:
+//	1. Replace multiple slashes with a single slash.
+//	2. Eliminate each . path name element (the current directory).
+//	3. Eliminate each inner .. path name element (the parent directory)
+//	   along with the non-.. element that precedes it.
+//	4. Eliminate .. elements that begin a rooted path:
+//	   that is, replace "/.." by "/" at the beginning of a path.
+//
+// If the result of this process is an empty string, "/" is returned.
+func cleanPath(p string) string {
+	// Turn empty string into "/"
+	if p == "" {
+		return "/"
+	}
+
+	n := len(p)
+	var buf []byte
+
+	// Invariants:
+	//      reading from path; r is index of next byte to process.
+	//      writing to buf; w is index of next byte to write.
+
+	// path must start with '/'
+	r := 1
+	w := 1
+
+	if p[0] != '/' {
+		r = 0
+		buf = make([]byte, n+1)
+		buf[0] = '/'
+	}
+
+	trailing := n > 1 && p[n-1] == '/'
+
+	// A bit more clunky without a 'lazybuf' like the path package, but the loop
+	// gets completely inlined (bufApp). So in contrast to the path package this
+	// loop has no expensive function calls (except 1x make)
+
+	for r < n {
+		switch {
+		case p[r] == '/':
+			// empty path element, trailing slash is added after the end
+			r++
+
+		case p[r] == '.' && r+1 == n:
+			trailing = true
+			r++
+
+		case p[r] == '.' && p[r+1] == '/':
+			// . element
+			r += 2
+
+		case p[r] == '.' && p[r+1] == '.' && (r+2 == n || p[r+2] == '/'):
+			// .. element: remove to last /
+			r += 3
+
+			if w > 1 {
+				// can backtrack
+				w--
+
+				if buf == nil {
+					for w > 1 && p[w] != '/' {
+						w--
+					}
+				} else {
+					for w > 1 && buf[w] != '/' {
+						w--
+					}
+				}
+			}
+
+		default:
+			// real path element.
+			// add slash if needed
+			if w > 1 {
+				bufApp(&buf, p, w, '/')
+				w++
+			}
+
+			// copy element
+			for r < n && p[r] != '/' {
+				bufApp(&buf, p, w, p[r])
+				w++
+				r++
+			}
+		}
+	}
+
+	// re-append trailing slash
+	if trailing && w > 1 {
+		bufApp(&buf, p, w, '/')
+		w++
+	}
+
+	if buf == nil {
+		return p[:w]
+	}
+	return string(buf[:w])
+}
+
+// internal helper to lazily create a buffer if necessary.
+func bufApp(buf *[]byte, s string, w int, c byte) {
+	if *buf == nil {
+		if s[w] == c {
+			return
+		}
+
+		*buf = make([]byte, len(s))
+		copy(*buf, s[:w])
+	}
+	(*buf)[w] = c
+}

backend/vendor/github.com/gin-gonic/gin/recovery.go

@@ -0,0 +1,151 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"log"
+	"net"
+	"net/http"
+	"net/http/httputil"
+	"os"
+	"runtime"
+	"strings"
+	"time"
+)
+
+var (
+	dunno     = []byte("???")
+	centerDot = []byte("·")
+	dot       = []byte(".")
+	slash     = []byte("/")
+)
+
+// Recovery returns a middleware that recovers from any panics and writes a 500 if there was one.
+func Recovery() HandlerFunc {
+	return RecoveryWithWriter(DefaultErrorWriter)
+}
+
+// RecoveryWithWriter returns a middleware for a given writer that recovers from any panics and writes a 500 if there was one.
+func RecoveryWithWriter(out io.Writer) HandlerFunc {
+	var logger *log.Logger
+	if out != nil {
+		logger = log.New(out, "\n\n\x1b[31m", log.LstdFlags)
+	}
+	return func(c *Context) {
+		defer func() {
+			if err := recover(); err != nil {
+				// Check for a broken connection, as it is not really a
+				// condition that warrants a panic stack trace.
+				var brokenPipe bool
+				if ne, ok := err.(*net.OpError); ok {
+					if se, ok := ne.Err.(*os.SyscallError); ok {
+						if strings.Contains(strings.ToLower(se.Error()), "broken pipe") || strings.Contains(strings.ToLower(se.Error()), "connection reset by peer") {
+							brokenPipe = true
+						}
+					}
+				}
+				if logger != nil {
+					stack := stack(3)
+					httpRequest, _ := httputil.DumpRequest(c.Request, false)
+					headers := strings.Split(string(httpRequest), "\r\n")
+					for idx, header := range headers {
+						current := strings.Split(header, ":")
+						if current[0] == "Authorization" {
+							headers[idx] = current[0] + ": *"
+						}
+					}
+					if brokenPipe {
+						logger.Printf("%s\n%s%s", err, string(httpRequest), reset)
+					} else if IsDebugging() {
+						logger.Printf("[Recovery] %s panic recovered:\n%s\n%s\n%s%s",
+							timeFormat(time.Now()), strings.Join(headers, "\r\n"), err, stack, reset)
+					} else {
+						logger.Printf("[Recovery] %s panic recovered:\n%s\n%s%s",
+							timeFormat(time.Now()), err, stack, reset)
+					}
+				}
+
+				// If the connection is dead, we can't write a status to it.
+				if brokenPipe {
+					c.Error(err.(error)) // nolint: errcheck
+					c.Abort()
+				} else {
+					c.AbortWithStatus(http.StatusInternalServerError)
+				}
+			}
+		}()
+		c.Next()
+	}
+}
+
+// stack returns a nicely formatted stack frame, skipping skip frames.
+func stack(skip int) []byte {
+	buf := new(bytes.Buffer) // the returned data
+	// As we loop, we open files and read them. These variables record the currently
+	// loaded file.
+	var lines [][]byte
+	var lastFile string
+	for i := skip; ; i++ { // Skip the expected number of frames
+		pc, file, line, ok := runtime.Caller(i)
+		if !ok {
+			break
+		}
+		// Print this much at least.  If we can't find the source, it won't show.
+		fmt.Fprintf(buf, "%s:%d (0x%x)\n", file, line, pc)
+		if file != lastFile {
+			data, err := ioutil.ReadFile(file)
+			if err != nil {
+				continue
+			}
+			lines = bytes.Split(data, []byte{'\n'})
+			lastFile = file
+		}
+		fmt.Fprintf(buf, "\t%s: %s\n", function(pc), source(lines, line))
+	}
+	return buf.Bytes()
+}
+
+// source returns a space-trimmed slice of the n'th line.
+func source(lines [][]byte, n int) []byte {
+	n-- // in stack trace, lines are 1-indexed but our array is 0-indexed
+	if n < 0 || n >= len(lines) {
+		return dunno
+	}
+	return bytes.TrimSpace(lines[n])
+}
+
+// function returns, if possible, the name of the function containing the PC.
+func function(pc uintptr) []byte {
+	fn := runtime.FuncForPC(pc)
+	if fn == nil {
+		return dunno
+	}
+	name := []byte(fn.Name())
+	// The name includes the path name to the package, which is unnecessary
+	// since the file name is already included.  Plus, it has center dots.
+	// That is, we see
+	//	runtime/debug.*T·ptrmethod
+	// and want
+	//	*T.ptrmethod
+	// Also the package path might contains dot (e.g. code.google.com/...),
+	// so first eliminate the path prefix
+	if lastSlash := bytes.LastIndex(name, slash); lastSlash >= 0 {
+		name = name[lastSlash+1:]
+	}
+	if period := bytes.Index(name, dot); period >= 0 {
+		name = name[period+1:]
+	}
+	name = bytes.Replace(name, centerDot, dot, -1)
+	return name
+}
+
+func timeFormat(t time.Time) string {
+	var timeString = t.Format("2006/01/02 - 15:04:05")
+	return timeString
+}

backend/vendor/github.com/gin-gonic/gin/render/data.go

@@ -0,0 +1,25 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package render
+
+import "net/http"
+
+// Data contains ContentType and bytes data.
+type Data struct {
+	ContentType string
+	Data        []byte
+}
+
+// Render (Data) writes data with custom ContentType.
+func (r Data) Render(w http.ResponseWriter) (err error) {
+	r.WriteContentType(w)
+	_, err = w.Write(r.Data)
+	return
+}
+
+// WriteContentType (Data) writes custom ContentType.
+func (r Data) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, []string{r.ContentType})
+}

backend/vendor/github.com/gin-gonic/gin/render/html.go

@@ -0,0 +1,92 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package render
+
+import (
+	"html/template"
+	"net/http"
+)
+
+// Delims represents a set of Left and Right delimiters for HTML template rendering.
+type Delims struct {
+	// Left delimiter, defaults to {{.
+	Left string
+	// Right delimiter, defaults to }}.
+	Right string
+}
+
+// HTMLRender interface is to be implemented by HTMLProduction and HTMLDebug.
+type HTMLRender interface {
+	// Instance returns an HTML instance.
+	Instance(string, interface{}) Render
+}
+
+// HTMLProduction contains template reference and its delims.
+type HTMLProduction struct {
+	Template *template.Template
+	Delims   Delims
+}
+
+// HTMLDebug contains template delims and pattern and function with file list.
+type HTMLDebug struct {
+	Files   []string
+	Glob    string
+	Delims  Delims
+	FuncMap template.FuncMap
+}
+
+// HTML contains template reference and its name with given interface object.
+type HTML struct {
+	Template *template.Template
+	Name     string
+	Data     interface{}
+}
+
+var htmlContentType = []string{"text/html; charset=utf-8"}
+
+// Instance (HTMLProduction) returns an HTML instance which it realizes Render interface.
+func (r HTMLProduction) Instance(name string, data interface{}) Render {
+	return HTML{
+		Template: r.Template,
+		Name:     name,
+		Data:     data,
+	}
+}
+
+// Instance (HTMLDebug) returns an HTML instance which it realizes Render interface.
+func (r HTMLDebug) Instance(name string, data interface{}) Render {
+	return HTML{
+		Template: r.loadTemplate(),
+		Name:     name,
+		Data:     data,
+	}
+}
+func (r HTMLDebug) loadTemplate() *template.Template {
+	if r.FuncMap == nil {
+		r.FuncMap = template.FuncMap{}
+	}
+	if len(r.Files) > 0 {
+		return template.Must(template.New("").Delims(r.Delims.Left, r.Delims.Right).Funcs(r.FuncMap).ParseFiles(r.Files...))
+	}
+	if r.Glob != "" {
+		return template.Must(template.New("").Delims(r.Delims.Left, r.Delims.Right).Funcs(r.FuncMap).ParseGlob(r.Glob))
+	}
+	panic("the HTML debug render was created without files or glob pattern")
+}
+
+// Render (HTML) executes template and writes its result with custom ContentType for response.
+func (r HTML) Render(w http.ResponseWriter) error {
+	r.WriteContentType(w)
+
+	if r.Name == "" {
+		return r.Template.Execute(w, r.Data)
+	}
+	return r.Template.ExecuteTemplate(w, r.Name, r.Data)
+}
+
+// WriteContentType (HTML) writes HTML ContentType.
+func (r HTML) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, htmlContentType)
+}

backend/vendor/github.com/gin-gonic/gin/render/json.go

@@ -0,0 +1,194 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package render
+
+import (
+	"bytes"
+	"fmt"
+	"html/template"
+	"net/http"
+
+	"github.com/gin-gonic/gin/internal/json"
+)
+
+// JSON contains the given interface object.
+type JSON struct {
+	Data interface{}
+}
+
+// IndentedJSON contains the given interface object.
+type IndentedJSON struct {
+	Data interface{}
+}
+
+// SecureJSON contains the given interface object and its prefix.
+type SecureJSON struct {
+	Prefix string
+	Data   interface{}
+}
+
+// JsonpJSON contains the given interface object its callback.
+type JsonpJSON struct {
+	Callback string
+	Data     interface{}
+}
+
+// AsciiJSON contains the given interface object.
+type AsciiJSON struct {
+	Data interface{}
+}
+
+// SecureJSONPrefix is a string which represents SecureJSON prefix.
+type SecureJSONPrefix string
+
+// PureJSON contains the given interface object.
+type PureJSON struct {
+	Data interface{}
+}
+
+var jsonContentType = []string{"application/json; charset=utf-8"}
+var jsonpContentType = []string{"application/javascript; charset=utf-8"}
+var jsonAsciiContentType = []string{"application/json"}
+
+// Render (JSON) writes data with custom ContentType.
+func (r JSON) Render(w http.ResponseWriter) (err error) {
+	if err = WriteJSON(w, r.Data); err != nil {
+		panic(err)
+	}
+	return
+}
+
+// WriteContentType (JSON) writes JSON ContentType.
+func (r JSON) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, jsonContentType)
+}
+
+// WriteJSON marshals the given interface object and writes it with custom ContentType.
+func WriteJSON(w http.ResponseWriter, obj interface{}) error {
+	writeContentType(w, jsonContentType)
+	jsonBytes, err := json.Marshal(obj)
+	if err != nil {
+		return err
+	}
+	_, err = w.Write(jsonBytes)
+	return err
+}
+
+// Render (IndentedJSON) marshals the given interface object and writes it with custom ContentType.
+func (r IndentedJSON) Render(w http.ResponseWriter) error {
+	r.WriteContentType(w)
+	jsonBytes, err := json.MarshalIndent(r.Data, "", "    ")
+	if err != nil {
+		return err
+	}
+	_, err = w.Write(jsonBytes)
+	return err
+}
+
+// WriteContentType (IndentedJSON) writes JSON ContentType.
+func (r IndentedJSON) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, jsonContentType)
+}
+
+// Render (SecureJSON) marshals the given interface object and writes it with custom ContentType.
+func (r SecureJSON) Render(w http.ResponseWriter) error {
+	r.WriteContentType(w)
+	jsonBytes, err := json.Marshal(r.Data)
+	if err != nil {
+		return err
+	}
+	// if the jsonBytes is array values
+	if bytes.HasPrefix(jsonBytes, []byte("[")) && bytes.HasSuffix(jsonBytes, []byte("]")) {
+		_, err = w.Write([]byte(r.Prefix))
+		if err != nil {
+			return err
+		}
+	}
+	_, err = w.Write(jsonBytes)
+	return err
+}
+
+// WriteContentType (SecureJSON) writes JSON ContentType.
+func (r SecureJSON) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, jsonContentType)
+}
+
+// Render (JsonpJSON) marshals the given interface object and writes it and its callback with custom ContentType.
+func (r JsonpJSON) Render(w http.ResponseWriter) (err error) {
+	r.WriteContentType(w)
+	ret, err := json.Marshal(r.Data)
+	if err != nil {
+		return err
+	}
+
+	if r.Callback == "" {
+		_, err = w.Write(ret)
+		return err
+	}
+
+	callback := template.JSEscapeString(r.Callback)
+	_, err = w.Write([]byte(callback))
+	if err != nil {
+		return err
+	}
+	_, err = w.Write([]byte("("))
+	if err != nil {
+		return err
+	}
+	_, err = w.Write(ret)
+	if err != nil {
+		return err
+	}
+	_, err = w.Write([]byte(")"))
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// WriteContentType (JsonpJSON) writes Javascript ContentType.
+func (r JsonpJSON) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, jsonpContentType)
+}
+
+// Render (AsciiJSON) marshals the given interface object and writes it with custom ContentType.
+func (r AsciiJSON) Render(w http.ResponseWriter) (err error) {
+	r.WriteContentType(w)
+	ret, err := json.Marshal(r.Data)
+	if err != nil {
+		return err
+	}
+
+	var buffer bytes.Buffer
+	for _, r := range string(ret) {
+		cvt := string(r)
+		if r >= 128 {
+			cvt = fmt.Sprintf("\\u%04x", int64(r))
+		}
+		buffer.WriteString(cvt)
+	}
+
+	_, err = w.Write(buffer.Bytes())
+	return err
+}
+
+// WriteContentType (AsciiJSON) writes JSON ContentType.
+func (r AsciiJSON) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, jsonAsciiContentType)
+}
+
+// Render (PureJSON) writes custom ContentType and encodes the given interface object.
+func (r PureJSON) Render(w http.ResponseWriter) error {
+	r.WriteContentType(w)
+	encoder := json.NewEncoder(w)
+	encoder.SetEscapeHTML(false)
+	return encoder.Encode(r.Data)
+}
+
+// WriteContentType (PureJSON) writes custom ContentType.
+func (r PureJSON) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, jsonContentType)
+}

backend/vendor/github.com/gin-gonic/gin/render/msgpack.go

@@ -0,0 +1,35 @@
+// Copyright 2017 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package render
+
+import (
+	"net/http"
+
+	"github.com/ugorji/go/codec"
+)
+
+// MsgPack contains the given interface object.
+type MsgPack struct {
+	Data interface{}
+}
+
+var msgpackContentType = []string{"application/msgpack; charset=utf-8"}
+
+// WriteContentType (MsgPack) writes MsgPack ContentType.
+func (r MsgPack) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, msgpackContentType)
+}
+
+// Render (MsgPack) encodes the given interface object and writes data with custom ContentType.
+func (r MsgPack) Render(w http.ResponseWriter) error {
+	return WriteMsgPack(w, r.Data)
+}
+
+// WriteMsgPack writes MsgPack ContentType and encodes the given interface object.
+func WriteMsgPack(w http.ResponseWriter, obj interface{}) error {
+	writeContentType(w, msgpackContentType)
+	var mh codec.MsgpackHandle
+	return codec.NewEncoder(w, &mh).Encode(obj)
+}

backend/vendor/github.com/gin-gonic/gin/render/protobuf.go

@@ -0,0 +1,36 @@
+// Copyright 2018 Gin Core Team.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package render
+
+import (
+	"net/http"
+
+	"github.com/golang/protobuf/proto"
+)
+
+// ProtoBuf contains the given interface object.
+type ProtoBuf struct {
+	Data interface{}
+}
+
+var protobufContentType = []string{"application/x-protobuf"}
+
+// Render (ProtoBuf) marshals the given interface object and writes data with custom ContentType.
+func (r ProtoBuf) Render(w http.ResponseWriter) error {
+	r.WriteContentType(w)
+
+	bytes, err := proto.Marshal(r.Data.(proto.Message))
+	if err != nil {
+		return err
+	}
+
+	_, err = w.Write(bytes)
+	return err
+}
+
+// WriteContentType (ProtoBuf) writes ProtoBuf ContentType.
+func (r ProtoBuf) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, protobufContentType)
+}

backend/vendor/github.com/gin-gonic/gin/render/reader.go

@@ -0,0 +1,43 @@
+// Copyright 2018 Gin Core Team.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package render
+
+import (
+	"io"
+	"net/http"
+	"strconv"
+)
+
+// Reader contains the IO reader and its length, and custom ContentType and other headers.
+type Reader struct {
+	ContentType   string
+	ContentLength int64
+	Reader        io.Reader
+	Headers       map[string]string
+}
+
+// Render (Reader) writes data with custom ContentType and headers.
+func (r Reader) Render(w http.ResponseWriter) (err error) {
+	r.WriteContentType(w)
+	r.Headers["Content-Length"] = strconv.FormatInt(r.ContentLength, 10)
+	r.writeHeaders(w, r.Headers)
+	_, err = io.Copy(w, r.Reader)
+	return
+}
+
+// WriteContentType (Reader) writes custom ContentType.
+func (r Reader) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, []string{r.ContentType})
+}
+
+// writeHeaders writes custom Header.
+func (r Reader) writeHeaders(w http.ResponseWriter, headers map[string]string) {
+	header := w.Header()
+	for k, v := range headers {
+		if header.Get(k) == "" {
+			header.Set(k, v)
+		}
+	}
+}

backend/vendor/github.com/gin-gonic/gin/render/redirect.go

@@ -0,0 +1,29 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package render
+
+import (
+	"fmt"
+	"net/http"
+)
+
+// Redirect contains the http request reference and redirects status code and location.
+type Redirect struct {
+	Code     int
+	Request  *http.Request
+	Location string
+}
+
+// Render (Redirect) redirects the http request to new location and writes redirect response.
+func (r Redirect) Render(w http.ResponseWriter) error {
+	if (r.Code < http.StatusMultipleChoices || r.Code > http.StatusPermanentRedirect) && r.Code != http.StatusCreated {
+		panic(fmt.Sprintf("Cannot redirect with status code %d", r.Code))
+	}
+	http.Redirect(w, r.Request, r.Location, r.Code)
+	return nil
+}
+
+// WriteContentType (Redirect) don't write any ContentType.
+func (r Redirect) WriteContentType(http.ResponseWriter) {}

backend/vendor/github.com/gin-gonic/gin/render/render.go

@@ -0,0 +1,41 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package render
+
+import "net/http"
+
+// Render interface is to be implemented by JSON, XML, HTML, YAML and so on.
+type Render interface {
+	// Render writes data with custom ContentType.
+	Render(http.ResponseWriter) error
+	// WriteContentType writes custom ContentType.
+	WriteContentType(w http.ResponseWriter)
+}
+
+var (
+	_ Render     = JSON{}
+	_ Render     = IndentedJSON{}
+	_ Render     = SecureJSON{}
+	_ Render     = JsonpJSON{}
+	_ Render     = XML{}
+	_ Render     = String{}
+	_ Render     = Redirect{}
+	_ Render     = Data{}
+	_ Render     = HTML{}
+	_ HTMLRender = HTMLDebug{}
+	_ HTMLRender = HTMLProduction{}
+	_ Render     = YAML{}
+	_ Render     = MsgPack{}
+	_ Render     = Reader{}
+	_ Render     = AsciiJSON{}
+	_ Render     = ProtoBuf{}
+)
+
+func writeContentType(w http.ResponseWriter, value []string) {
+	header := w.Header()
+	if val := header["Content-Type"]; len(val) == 0 {
+		header["Content-Type"] = value
+	}
+}

backend/vendor/github.com/gin-gonic/gin/render/text.go

@@ -0,0 +1,40 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package render
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+)
+
+// String contains the given interface object slice and its format.
+type String struct {
+	Format string
+	Data   []interface{}
+}
+
+var plainContentType = []string{"text/plain; charset=utf-8"}
+
+// Render (String) writes data with custom ContentType.
+func (r String) Render(w http.ResponseWriter) error {
+	return WriteString(w, r.Format, r.Data)
+}
+
+// WriteContentType (String) writes Plain ContentType.
+func (r String) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, plainContentType)
+}
+
+// WriteString writes data according to its format and write custom ContentType.
+func WriteString(w http.ResponseWriter, format string, data []interface{}) (err error) {
+	writeContentType(w, plainContentType)
+	if len(data) > 0 {
+		_, err = fmt.Fprintf(w, format, data...)
+		return
+	}
+	_, err = io.WriteString(w, format)
+	return
+}

backend/vendor/github.com/gin-gonic/gin/render/xml.go

@@ -0,0 +1,28 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package render
+
+import (
+	"encoding/xml"
+	"net/http"
+)
+
+// XML contains the given interface object.
+type XML struct {
+	Data interface{}
+}
+
+var xmlContentType = []string{"application/xml; charset=utf-8"}
+
+// Render (XML) encodes the given interface object and writes data with custom ContentType.
+func (r XML) Render(w http.ResponseWriter) error {
+	r.WriteContentType(w)
+	return xml.NewEncoder(w).Encode(r.Data)
+}
+
+// WriteContentType (XML) writes XML ContentType for response.
+func (r XML) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, xmlContentType)
+}

backend/vendor/github.com/gin-gonic/gin/render/yaml.go

@@ -0,0 +1,36 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package render
+
+import (
+	"net/http"
+
+	"gopkg.in/yaml.v2"
+)
+
+// YAML contains the given interface object.
+type YAML struct {
+	Data interface{}
+}
+
+var yamlContentType = []string{"application/x-yaml; charset=utf-8"}
+
+// Render (YAML) marshals the given interface object and writes data with custom ContentType.
+func (r YAML) Render(w http.ResponseWriter) error {
+	r.WriteContentType(w)
+
+	bytes, err := yaml.Marshal(r.Data)
+	if err != nil {
+		return err
+	}
+
+	_, err = w.Write(bytes)
+	return err
+}
+
+// WriteContentType (YAML) writes YAML ContentType for response.
+func (r YAML) WriteContentType(w http.ResponseWriter) {
+	writeContentType(w, yamlContentType)
+}

backend/vendor/github.com/gin-gonic/gin/response_writer.go

@@ -0,0 +1,126 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import (
+	"bufio"
+	"io"
+	"net"
+	"net/http"
+)
+
+const (
+	noWritten     = -1
+	defaultStatus = http.StatusOK
+)
+
+// ResponseWriter ...
+type ResponseWriter interface {
+	http.ResponseWriter
+	http.Hijacker
+	http.Flusher
+	http.CloseNotifier
+
+	// Returns the HTTP response status code of the current request.
+	Status() int
+
+	// Returns the number of bytes already written into the response http body.
+	// See Written()
+	Size() int
+
+	// Writes the string into the response body.
+	WriteString(string) (int, error)
+
+	// Returns true if the response body was already written.
+	Written() bool
+
+	// Forces to write the http header (status code + headers).
+	WriteHeaderNow()
+
+	// get the http.Pusher for server push
+	Pusher() http.Pusher
+}
+
+type responseWriter struct {
+	http.ResponseWriter
+	size   int
+	status int
+}
+
+var _ ResponseWriter = &responseWriter{}
+
+func (w *responseWriter) reset(writer http.ResponseWriter) {
+	w.ResponseWriter = writer
+	w.size = noWritten
+	w.status = defaultStatus
+}
+
+func (w *responseWriter) WriteHeader(code int) {
+	if code > 0 && w.status != code {
+		if w.Written() {
+			debugPrint("[WARNING] Headers were already written. Wanted to override status code %d with %d", w.status, code)
+		}
+		w.status = code
+	}
+}
+
+func (w *responseWriter) WriteHeaderNow() {
+	if !w.Written() {
+		w.size = 0
+		w.ResponseWriter.WriteHeader(w.status)
+	}
+}
+
+func (w *responseWriter) Write(data []byte) (n int, err error) {
+	w.WriteHeaderNow()
+	n, err = w.ResponseWriter.Write(data)
+	w.size += n
+	return
+}
+
+func (w *responseWriter) WriteString(s string) (n int, err error) {
+	w.WriteHeaderNow()
+	n, err = io.WriteString(w.ResponseWriter, s)
+	w.size += n
+	return
+}
+
+func (w *responseWriter) Status() int {
+	return w.status
+}
+
+func (w *responseWriter) Size() int {
+	return w.size
+}
+
+func (w *responseWriter) Written() bool {
+	return w.size != noWritten
+}
+
+// Hijack implements the http.Hijacker interface.
+func (w *responseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+	if w.size < 0 {
+		w.size = 0
+	}
+	return w.ResponseWriter.(http.Hijacker).Hijack()
+}
+
+// CloseNotify implements the http.CloseNotify interface.
+func (w *responseWriter) CloseNotify() <-chan bool {
+	return w.ResponseWriter.(http.CloseNotifier).CloseNotify()
+}
+
+// Flush implements the http.Flush interface.
+func (w *responseWriter) Flush() {
+	w.WriteHeaderNow()
+	w.ResponseWriter.(http.Flusher).Flush()
+}
+
+func (w *responseWriter) Pusher() (pusher http.Pusher) {
+	if pusher, ok := w.ResponseWriter.(http.Pusher); ok {
+		return pusher
+	}
+	return nil
+}

backend/vendor/github.com/gin-gonic/gin/routergroup.go

@@ -0,0 +1,228 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import (
+	"net/http"
+	"path"
+	"regexp"
+	"strings"
+)
+
+// IRouter defines all router handle interface includes single and group router.
+type IRouter interface {
+	IRoutes
+	Group(string, ...HandlerFunc) *RouterGroup
+}
+
+// IRoutes defines all router handle interface.
+type IRoutes interface {
+	Use(...HandlerFunc) IRoutes
+
+	Handle(string, string, ...HandlerFunc) IRoutes
+	Any(string, ...HandlerFunc) IRoutes
+	GET(string, ...HandlerFunc) IRoutes
+	POST(string, ...HandlerFunc) IRoutes
+	DELETE(string, ...HandlerFunc) IRoutes
+	PATCH(string, ...HandlerFunc) IRoutes
+	PUT(string, ...HandlerFunc) IRoutes
+	OPTIONS(string, ...HandlerFunc) IRoutes
+	HEAD(string, ...HandlerFunc) IRoutes
+
+	StaticFile(string, string) IRoutes
+	Static(string, string) IRoutes
+	StaticFS(string, http.FileSystem) IRoutes
+}
+
+// RouterGroup is used internally to configure router, a RouterGroup is associated with
+// a prefix and an array of handlers (middleware).
+type RouterGroup struct {
+	Handlers HandlersChain
+	basePath string
+	engine   *Engine
+	root     bool
+}
+
+var _ IRouter = &RouterGroup{}
+
+// Use adds middleware to the group, see example code in GitHub.
+func (group *RouterGroup) Use(middleware ...HandlerFunc) IRoutes {
+	group.Handlers = append(group.Handlers, middleware...)
+	return group.returnObj()
+}
+
+// Group creates a new router group. You should add all the routes that have common middlewares or the same path prefix.
+// For example, all the routes that use a common middleware for authorization could be grouped.
+func (group *RouterGroup) Group(relativePath string, handlers ...HandlerFunc) *RouterGroup {
+	return &RouterGroup{
+		Handlers: group.combineHandlers(handlers),
+		basePath: group.calculateAbsolutePath(relativePath),
+		engine:   group.engine,
+	}
+}
+
+// BasePath returns the base path of router group.
+// For example, if v := router.Group("/rest/n/v1/api"), v.BasePath() is "/rest/n/v1/api".
+func (group *RouterGroup) BasePath() string {
+	return group.basePath
+}
+
+func (group *RouterGroup) handle(httpMethod, relativePath string, handlers HandlersChain) IRoutes {
+	absolutePath := group.calculateAbsolutePath(relativePath)
+	handlers = group.combineHandlers(handlers)
+	group.engine.addRoute(httpMethod, absolutePath, handlers)
+	return group.returnObj()
+}
+
+// Handle registers a new request handle and middleware with the given path and method.
+// The last handler should be the real handler, the other ones should be middleware that can and should be shared among different routes.
+// See the example code in GitHub.
+//
+// For GET, POST, PUT, PATCH and DELETE requests the respective shortcut
+// functions can be used.
+//
+// This function is intended for bulk loading and to allow the usage of less
+// frequently used, non-standardized or custom methods (e.g. for internal
+// communication with a proxy).
+func (group *RouterGroup) Handle(httpMethod, relativePath string, handlers ...HandlerFunc) IRoutes {
+	if matches, err := regexp.MatchString("^[A-Z]+$", httpMethod); !matches || err != nil {
+		panic("http method " + httpMethod + " is not valid")
+	}
+	return group.handle(httpMethod, relativePath, handlers)
+}
+
+// POST is a shortcut for router.Handle("POST", path, handle).
+func (group *RouterGroup) POST(relativePath string, handlers ...HandlerFunc) IRoutes {
+	return group.handle("POST", relativePath, handlers)
+}
+
+// GET is a shortcut for router.Handle("GET", path, handle).
+func (group *RouterGroup) GET(relativePath string, handlers ...HandlerFunc) IRoutes {
+	return group.handle("GET", relativePath, handlers)
+}
+
+// DELETE is a shortcut for router.Handle("DELETE", path, handle).
+func (group *RouterGroup) DELETE(relativePath string, handlers ...HandlerFunc) IRoutes {
+	return group.handle("DELETE", relativePath, handlers)
+}
+
+// PATCH is a shortcut for router.Handle("PATCH", path, handle).
+func (group *RouterGroup) PATCH(relativePath string, handlers ...HandlerFunc) IRoutes {
+	return group.handle("PATCH", relativePath, handlers)
+}
+
+// PUT is a shortcut for router.Handle("PUT", path, handle).
+func (group *RouterGroup) PUT(relativePath string, handlers ...HandlerFunc) IRoutes {
+	return group.handle("PUT", relativePath, handlers)
+}
+
+// OPTIONS is a shortcut for router.Handle("OPTIONS", path, handle).
+func (group *RouterGroup) OPTIONS(relativePath string, handlers ...HandlerFunc) IRoutes {
+	return group.handle("OPTIONS", relativePath, handlers)
+}
+
+// HEAD is a shortcut for router.Handle("HEAD", path, handle).
+func (group *RouterGroup) HEAD(relativePath string, handlers ...HandlerFunc) IRoutes {
+	return group.handle("HEAD", relativePath, handlers)
+}
+
+// Any registers a route that matches all the HTTP methods.
+// GET, POST, PUT, PATCH, HEAD, OPTIONS, DELETE, CONNECT, TRACE.
+func (group *RouterGroup) Any(relativePath string, handlers ...HandlerFunc) IRoutes {
+	group.handle("GET", relativePath, handlers)
+	group.handle("POST", relativePath, handlers)
+	group.handle("PUT", relativePath, handlers)
+	group.handle("PATCH", relativePath, handlers)
+	group.handle("HEAD", relativePath, handlers)
+	group.handle("OPTIONS", relativePath, handlers)
+	group.handle("DELETE", relativePath, handlers)
+	group.handle("CONNECT", relativePath, handlers)
+	group.handle("TRACE", relativePath, handlers)
+	return group.returnObj()
+}
+
+// StaticFile registers a single route in order to serve a single file of the local filesystem.
+// router.StaticFile("favicon.ico", "./resources/favicon.ico")
+func (group *RouterGroup) StaticFile(relativePath, filepath string) IRoutes {
+	if strings.Contains(relativePath, ":") || strings.Contains(relativePath, "*") {
+		panic("URL parameters can not be used when serving a static file")
+	}
+	handler := func(c *Context) {
+		c.File(filepath)
+	}
+	group.GET(relativePath, handler)
+	group.HEAD(relativePath, handler)
+	return group.returnObj()
+}
+
+// Static serves files from the given file system root.
+// Internally a http.FileServer is used, therefore http.NotFound is used instead
+// of the Router's NotFound handler.
+// To use the operating system's file system implementation,
+// use :
+//     router.Static("/static", "/var/www")
+func (group *RouterGroup) Static(relativePath, root string) IRoutes {
+	return group.StaticFS(relativePath, Dir(root, false))
+}
+
+// StaticFS works just like `Static()` but a custom `http.FileSystem` can be used instead.
+// Gin by default user: gin.Dir()
+func (group *RouterGroup) StaticFS(relativePath string, fs http.FileSystem) IRoutes {
+	if strings.Contains(relativePath, ":") || strings.Contains(relativePath, "*") {
+		panic("URL parameters can not be used when serving a static folder")
+	}
+	handler := group.createStaticHandler(relativePath, fs)
+	urlPattern := path.Join(relativePath, "/*filepath")
+
+	// Register GET and HEAD handlers
+	group.GET(urlPattern, handler)
+	group.HEAD(urlPattern, handler)
+	return group.returnObj()
+}
+
+func (group *RouterGroup) createStaticHandler(relativePath string, fs http.FileSystem) HandlerFunc {
+	absolutePath := group.calculateAbsolutePath(relativePath)
+	fileServer := http.StripPrefix(absolutePath, http.FileServer(fs))
+
+	return func(c *Context) {
+		if _, nolisting := fs.(*onlyfilesFS); nolisting {
+			c.Writer.WriteHeader(http.StatusNotFound)
+		}
+
+		file := c.Param("filepath")
+		// Check if file exists and/or if we have permission to access it
+		if _, err := fs.Open(file); err != nil {
+			c.Writer.WriteHeader(http.StatusNotFound)
+			c.handlers = group.engine.noRoute
+			// Reset index
+			c.index = -1
+			return
+		}
+
+		fileServer.ServeHTTP(c.Writer, c.Request)
+	}
+}
+
+func (group *RouterGroup) combineHandlers(handlers HandlersChain) HandlersChain {
+	finalSize := len(group.Handlers) + len(handlers)
+	if finalSize >= int(abortIndex) {
+		panic("too many handlers")
+	}
+	mergedHandlers := make(HandlersChain, finalSize)
+	copy(mergedHandlers, group.Handlers)
+	copy(mergedHandlers[len(group.Handlers):], handlers)
+	return mergedHandlers
+}
+
+func (group *RouterGroup) calculateAbsolutePath(relativePath string) string {
+	return joinPaths(group.basePath, relativePath)
+}
+
+func (group *RouterGroup) returnObj() IRoutes {
+	if group.root {
+		return group.engine
+	}
+	return group
+}

backend/vendor/github.com/gin-gonic/gin/test_helpers.go

@@ -0,0 +1,16 @@
+// Copyright 2017 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import "net/http"
+
+// CreateTestContext returns a fresh engine and context for testing purposes
+func CreateTestContext(w http.ResponseWriter) (c *Context, r *Engine) {
+	r = New()
+	c = r.allocateContext()
+	c.reset()
+	c.writermem.reset(w)
+	return
+}

backend/vendor/github.com/gin-gonic/gin/tree.go

@@ -0,0 +1,627 @@
+// Copyright 2013 Julien Schmidt. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be found
+// at https://github.com/julienschmidt/httprouter/blob/master/LICENSE
+
+package gin
+
+import (
+	"net/url"
+	"strings"
+	"unicode"
+)
+
+// Param is a single URL parameter, consisting of a key and a value.
+type Param struct {
+	Key   string
+	Value string
+}
+
+// Params is a Param-slice, as returned by the router.
+// The slice is ordered, the first URL parameter is also the first slice value.
+// It is therefore safe to read values by the index.
+type Params []Param
+
+// Get returns the value of the first Param which key matches the given name.
+// If no matching Param is found, an empty string is returned.
+func (ps Params) Get(name string) (string, bool) {
+	for _, entry := range ps {
+		if entry.Key == name {
+			return entry.Value, true
+		}
+	}
+	return "", false
+}
+
+// ByName returns the value of the first Param which key matches the given name.
+// If no matching Param is found, an empty string is returned.
+func (ps Params) ByName(name string) (va string) {
+	va, _ = ps.Get(name)
+	return
+}
+
+type methodTree struct {
+	method string
+	root   *node
+}
+
+type methodTrees []methodTree
+
+func (trees methodTrees) get(method string) *node {
+	for _, tree := range trees {
+		if tree.method == method {
+			return tree.root
+		}
+	}
+	return nil
+}
+
+func min(a, b int) int {
+	if a <= b {
+		return a
+	}
+	return b
+}
+
+func countParams(path string) uint8 {
+	var n uint
+	for i := 0; i < len(path); i++ {
+		if path[i] != ':' && path[i] != '*' {
+			continue
+		}
+		n++
+	}
+	if n >= 255 {
+		return 255
+	}
+	return uint8(n)
+}
+
+type nodeType uint8
+
+const (
+	static nodeType = iota // default
+	root
+	param
+	catchAll
+)
+
+type node struct {
+	path      string
+	indices   string
+	children  []*node
+	handlers  HandlersChain
+	priority  uint32
+	nType     nodeType
+	maxParams uint8
+	wildChild bool
+}
+
+// increments priority of the given child and reorders if necessary.
+func (n *node) incrementChildPrio(pos int) int {
+	n.children[pos].priority++
+	prio := n.children[pos].priority
+
+	// adjust position (move to front)
+	newPos := pos
+	for newPos > 0 && n.children[newPos-1].priority < prio {
+		// swap node positions
+		n.children[newPos-1], n.children[newPos] = n.children[newPos], n.children[newPos-1]
+
+		newPos--
+	}
+
+	// build new index char string
+	if newPos != pos {
+		n.indices = n.indices[:newPos] + // unchanged prefix, might be empty
+			n.indices[pos:pos+1] + // the index char we move
+			n.indices[newPos:pos] + n.indices[pos+1:] // rest without char at 'pos'
+	}
+
+	return newPos
+}
+
+// addRoute adds a node with the given handle to the path.
+// Not concurrency-safe!
+func (n *node) addRoute(path string, handlers HandlersChain) {
+	fullPath := path
+	n.priority++
+	numParams := countParams(path)
+
+	// non-empty tree
+	if len(n.path) > 0 || len(n.children) > 0 {
+	walk:
+		for {
+			// Update maxParams of the current node
+			if numParams > n.maxParams {
+				n.maxParams = numParams
+			}
+
+			// Find the longest common prefix.
+			// This also implies that the common prefix contains no ':' or '*'
+			// since the existing key can't contain those chars.
+			i := 0
+			max := min(len(path), len(n.path))
+			for i < max && path[i] == n.path[i] {
+				i++
+			}
+
+			// Split edge
+			if i < len(n.path) {
+				child := node{
+					path:      n.path[i:],
+					wildChild: n.wildChild,
+					indices:   n.indices,
+					children:  n.children,
+					handlers:  n.handlers,
+					priority:  n.priority - 1,
+				}
+
+				// Update maxParams (max of all children)
+				for i := range child.children {
+					if child.children[i].maxParams > child.maxParams {
+						child.maxParams = child.children[i].maxParams
+					}
+				}
+
+				n.children = []*node{&child}
+				// []byte for proper unicode char conversion, see #65
+				n.indices = string([]byte{n.path[i]})
+				n.path = path[:i]
+				n.handlers = nil
+				n.wildChild = false
+			}
+
+			// Make new node a child of this node
+			if i < len(path) {
+				path = path[i:]
+
+				if n.wildChild {
+					n = n.children[0]
+					n.priority++
+
+					// Update maxParams of the child node
+					if numParams > n.maxParams {
+						n.maxParams = numParams
+					}
+					numParams--
+
+					// Check if the wildcard matches
+					if len(path) >= len(n.path) && n.path == path[:len(n.path)] {
+						// check for longer wildcard, e.g. :name and :names
+						if len(n.path) >= len(path) || path[len(n.path)] == '/' {
+							continue walk
+						}
+					}
+
+					pathSeg := path
+					if n.nType != catchAll {
+						pathSeg = strings.SplitN(path, "/", 2)[0]
+					}
+					prefix := fullPath[:strings.Index(fullPath, pathSeg)] + n.path
+					panic("'" + pathSeg +
+						"' in new path '" + fullPath +
+						"' conflicts with existing wildcard '" + n.path +
+						"' in existing prefix '" + prefix +
+						"'")
+				}
+
+				c := path[0]
+
+				// slash after param
+				if n.nType == param && c == '/' && len(n.children) == 1 {
+					n = n.children[0]
+					n.priority++
+					continue walk
+				}
+
+				// Check if a child with the next path byte exists
+				for i := 0; i < len(n.indices); i++ {
+					if c == n.indices[i] {
+						i = n.incrementChildPrio(i)
+						n = n.children[i]
+						continue walk
+					}
+				}
+
+				// Otherwise insert it
+				if c != ':' && c != '*' {
+					// []byte for proper unicode char conversion, see #65
+					n.indices += string([]byte{c})
+					child := &node{
+						maxParams: numParams,
+					}
+					n.children = append(n.children, child)
+					n.incrementChildPrio(len(n.indices) - 1)
+					n = child
+				}
+				n.insertChild(numParams, path, fullPath, handlers)
+				return
+
+			} else if i == len(path) { // Make node a (in-path) leaf
+				if n.handlers != nil {
+					panic("handlers are already registered for path '" + fullPath + "'")
+				}
+				n.handlers = handlers
+			}
+			return
+		}
+	} else { // Empty tree
+		n.insertChild(numParams, path, fullPath, handlers)
+		n.nType = root
+	}
+}
+
+func (n *node) insertChild(numParams uint8, path string, fullPath string, handlers HandlersChain) {
+	var offset int // already handled bytes of the path
+
+	// find prefix until first wildcard (beginning with ':' or '*')
+	for i, max := 0, len(path); numParams > 0; i++ {
+		c := path[i]
+		if c != ':' && c != '*' {
+			continue
+		}
+
+		// find wildcard end (either '/' or path end)
+		end := i + 1
+		for end < max && path[end] != '/' {
+			switch path[end] {
+			// the wildcard name must not contain ':' and '*'
+			case ':', '*':
+				panic("only one wildcard per path segment is allowed, has: '" +
+					path[i:] + "' in path '" + fullPath + "'")
+			default:
+				end++
+			}
+		}
+
+		// check if this Node existing children which would be
+		// unreachable if we insert the wildcard here
+		if len(n.children) > 0 {
+			panic("wildcard route '" + path[i:end] +
+				"' conflicts with existing children in path '" + fullPath + "'")
+		}
+
+		// check if the wildcard has a name
+		if end-i < 2 {
+			panic("wildcards must be named with a non-empty name in path '" + fullPath + "'")
+		}
+
+		if c == ':' { // param
+			// split path at the beginning of the wildcard
+			if i > 0 {
+				n.path = path[offset:i]
+				offset = i
+			}
+
+			child := &node{
+				nType:     param,
+				maxParams: numParams,
+			}
+			n.children = []*node{child}
+			n.wildChild = true
+			n = child
+			n.priority++
+			numParams--
+
+			// if the path doesn't end with the wildcard, then there
+			// will be another non-wildcard subpath starting with '/'
+			if end < max {
+				n.path = path[offset:end]
+				offset = end
+
+				child := &node{
+					maxParams: numParams,
+					priority:  1,
+				}
+				n.children = []*node{child}
+				n = child
+			}
+
+		} else { // catchAll
+			if end != max || numParams > 1 {
+				panic("catch-all routes are only allowed at the end of the path in path '" + fullPath + "'")
+			}
+
+			if len(n.path) > 0 && n.path[len(n.path)-1] == '/' {
+				panic("catch-all conflicts with existing handle for the path segment root in path '" + fullPath + "'")
+			}
+
+			// currently fixed width 1 for '/'
+			i--
+			if path[i] != '/' {
+				panic("no / before catch-all in path '" + fullPath + "'")
+			}
+
+			n.path = path[offset:i]
+
+			// first node: catchAll node with empty path
+			child := &node{
+				wildChild: true,
+				nType:     catchAll,
+				maxParams: 1,
+			}
+			n.children = []*node{child}
+			n.indices = string(path[i])
+			n = child
+			n.priority++
+
+			// second node: node holding the variable
+			child = &node{
+				path:      path[i:],
+				nType:     catchAll,
+				maxParams: 1,
+				handlers:  handlers,
+				priority:  1,
+			}
+			n.children = []*node{child}
+
+			return
+		}
+	}
+
+	// insert remaining path part and handle to the leaf
+	n.path = path[offset:]
+	n.handlers = handlers
+}
+
+// getValue returns the handle registered with the given path (key). The values of
+// wildcards are saved to a map.
+// If no handle can be found, a TSR (trailing slash redirect) recommendation is
+// made if a handle exists with an extra (without the) trailing slash for the
+// given path.
+func (n *node) getValue(path string, po Params, unescape bool) (handlers HandlersChain, p Params, tsr bool) {
+	p = po
+walk: // Outer loop for walking the tree
+	for {
+		if len(path) > len(n.path) {
+			if path[:len(n.path)] == n.path {
+				path = path[len(n.path):]
+				// If this node does not have a wildcard (param or catchAll)
+				// child,  we can just look up the next child node and continue
+				// to walk down the tree
+				if !n.wildChild {
+					c := path[0]
+					for i := 0; i < len(n.indices); i++ {
+						if c == n.indices[i] {
+							n = n.children[i]
+							continue walk
+						}
+					}
+
+					// Nothing found.
+					// We can recommend to redirect to the same URL without a
+					// trailing slash if a leaf exists for that path.
+					tsr = path == "/" && n.handlers != nil
+					return
+				}
+
+				// handle wildcard child
+				n = n.children[0]
+				switch n.nType {
+				case param:
+					// find param end (either '/' or path end)
+					end := 0
+					for end < len(path) && path[end] != '/' {
+						end++
+					}
+
+					// save param value
+					if cap(p) < int(n.maxParams) {
+						p = make(Params, 0, n.maxParams)
+					}
+					i := len(p)
+					p = p[:i+1] // expand slice within preallocated capacity
+					p[i].Key = n.path[1:]
+					val := path[:end]
+					if unescape {
+						var err error
+						if p[i].Value, err = url.QueryUnescape(val); err != nil {
+							p[i].Value = val // fallback, in case of error
+						}
+					} else {
+						p[i].Value = val
+					}
+
+					// we need to go deeper!
+					if end < len(path) {
+						if len(n.children) > 0 {
+							path = path[end:]
+							n = n.children[0]
+							continue walk
+						}
+
+						// ... but we can't
+						tsr = len(path) == end+1
+						return
+					}
+
+					if handlers = n.handlers; handlers != nil {
+						return
+					}
+					if len(n.children) == 1 {
+						// No handle found. Check if a handle for this path + a
+						// trailing slash exists for TSR recommendation
+						n = n.children[0]
+						tsr = n.path == "/" && n.handlers != nil
+					}
+
+					return
+
+				case catchAll:
+					// save param value
+					if cap(p) < int(n.maxParams) {
+						p = make(Params, 0, n.maxParams)
+					}
+					i := len(p)
+					p = p[:i+1] // expand slice within preallocated capacity
+					p[i].Key = n.path[2:]
+					if unescape {
+						var err error
+						if p[i].Value, err = url.QueryUnescape(path); err != nil {
+							p[i].Value = path // fallback, in case of error
+						}
+					} else {
+						p[i].Value = path
+					}
+
+					handlers = n.handlers
+					return
+
+				default:
+					panic("invalid node type")
+				}
+			}
+		} else if path == n.path {
+			// We should have reached the node containing the handle.
+			// Check if this node has a handle registered.
+			if handlers = n.handlers; handlers != nil {
+				return
+			}
+
+			if path == "/" && n.wildChild && n.nType != root {
+				tsr = true
+				return
+			}
+
+			// No handle found. Check if a handle for this path + a
+			// trailing slash exists for trailing slash recommendation
+			for i := 0; i < len(n.indices); i++ {
+				if n.indices[i] == '/' {
+					n = n.children[i]
+					tsr = (len(n.path) == 1 && n.handlers != nil) ||
+						(n.nType == catchAll && n.children[0].handlers != nil)
+					return
+				}
+			}
+
+			return
+		}
+
+		// Nothing found. We can recommend to redirect to the same URL with an
+		// extra trailing slash if a leaf exists for that path
+		tsr = (path == "/") ||
+			(len(n.path) == len(path)+1 && n.path[len(path)] == '/' &&
+				path == n.path[:len(n.path)-1] && n.handlers != nil)
+		return
+	}
+}
+
+// findCaseInsensitivePath makes a case-insensitive lookup of the given path and tries to find a handler.
+// It can optionally also fix trailing slashes.
+// It returns the case-corrected path and a bool indicating whether the lookup
+// was successful.
+func (n *node) findCaseInsensitivePath(path string, fixTrailingSlash bool) (ciPath []byte, found bool) {
+	ciPath = make([]byte, 0, len(path)+1) // preallocate enough memory
+
+	// Outer loop for walking the tree
+	for len(path) >= len(n.path) && strings.ToLower(path[:len(n.path)]) == strings.ToLower(n.path) {
+		path = path[len(n.path):]
+		ciPath = append(ciPath, n.path...)
+
+		if len(path) > 0 {
+			// If this node does not have a wildcard (param or catchAll) child,
+			// we can just look up the next child node and continue to walk down
+			// the tree
+			if !n.wildChild {
+				r := unicode.ToLower(rune(path[0]))
+				for i, index := range n.indices {
+					// must use recursive approach since both index and
+					// ToLower(index) could exist. We must check both.
+					if r == unicode.ToLower(index) {
+						out, found := n.children[i].findCaseInsensitivePath(path, fixTrailingSlash)
+						if found {
+							return append(ciPath, out...), true
+						}
+					}
+				}
+
+				// Nothing found. We can recommend to redirect to the same URL
+				// without a trailing slash if a leaf exists for that path
+				found = fixTrailingSlash && path == "/" && n.handlers != nil
+				return
+			}
+
+			n = n.children[0]
+			switch n.nType {
+			case param:
+				// find param end (either '/' or path end)
+				k := 0
+				for k < len(path) && path[k] != '/' {
+					k++
+				}
+
+				// add param value to case insensitive path
+				ciPath = append(ciPath, path[:k]...)
+
+				// we need to go deeper!
+				if k < len(path) {
+					if len(n.children) > 0 {
+						path = path[k:]
+						n = n.children[0]
+						continue
+					}
+
+					// ... but we can't
+					if fixTrailingSlash && len(path) == k+1 {
+						return ciPath, true
+					}
+					return
+				}
+
+				if n.handlers != nil {
+					return ciPath, true
+				} else if fixTrailingSlash && len(n.children) == 1 {
+					// No handle found. Check if a handle for this path + a
+					// trailing slash exists
+					n = n.children[0]
+					if n.path == "/" && n.handlers != nil {
+						return append(ciPath, '/'), true
+					}
+				}
+				return
+
+			case catchAll:
+				return append(ciPath, path...), true
+
+			default:
+				panic("invalid node type")
+			}
+		} else {
+			// We should have reached the node containing the handle.
+			// Check if this node has a handle registered.
+			if n.handlers != nil {
+				return ciPath, true
+			}
+
+			// No handle found.
+			// Try to fix the path by adding a trailing slash
+			if fixTrailingSlash {
+				for i := 0; i < len(n.indices); i++ {
+					if n.indices[i] == '/' {
+						n = n.children[i]
+						if (len(n.path) == 1 && n.handlers != nil) ||
+							(n.nType == catchAll && n.children[0].handlers != nil) {
+							return append(ciPath, '/'), true
+						}
+						return
+					}
+				}
+			}
+			return
+		}
+	}
+
+	// Nothing found.
+	// Try to fix the path by adding / removing a trailing slash
+	if fixTrailingSlash {
+		if path == "/" {
+			return ciPath, true
+		}
+		if len(path)+1 == len(n.path) && n.path[len(path)] == '/' &&
+			strings.ToLower(path) == strings.ToLower(n.path[:len(path)]) &&
+			n.handlers != nil {
+			return append(ciPath, n.path...), true
+		}
+	}
+	return
+}

backend/vendor/github.com/gin-gonic/gin/utils.go

@@ -0,0 +1,151 @@
+// Copyright 2014 Manu Martinez-Almeida.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+import (
+	"encoding/xml"
+	"net/http"
+	"os"
+	"path"
+	"reflect"
+	"runtime"
+	"strings"
+)
+
+// BindKey indicates a default bind key.
+const BindKey = "_gin-gonic/gin/bindkey"
+
+// Bind is a helper function for given interface object and returns a Gin middleware.
+func Bind(val interface{}) HandlerFunc {
+	value := reflect.ValueOf(val)
+	if value.Kind() == reflect.Ptr {
+		panic(`Bind struct can not be a pointer. Example:
+	Use: gin.Bind(Struct{}) instead of gin.Bind(&Struct{})
+`)
+	}
+	typ := value.Type()
+
+	return func(c *Context) {
+		obj := reflect.New(typ).Interface()
+		if c.Bind(obj) == nil {
+			c.Set(BindKey, obj)
+		}
+	}
+}
+
+// WrapF is a helper function for wrapping http.HandlerFunc and returns a Gin middleware.
+func WrapF(f http.HandlerFunc) HandlerFunc {
+	return func(c *Context) {
+		f(c.Writer, c.Request)
+	}
+}
+
+// WrapH is a helper function for wrapping http.Handler and returns a Gin middleware.
+func WrapH(h http.Handler) HandlerFunc {
+	return func(c *Context) {
+		h.ServeHTTP(c.Writer, c.Request)
+	}
+}
+
+// H is a shortcut for map[string]interface{}
+type H map[string]interface{}
+
+// MarshalXML allows type H to be used with xml.Marshal.
+func (h H) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
+	start.Name = xml.Name{
+		Space: "",
+		Local: "map",
+	}
+	if err := e.EncodeToken(start); err != nil {
+		return err
+	}
+	for key, value := range h {
+		elem := xml.StartElement{
+			Name: xml.Name{Space: "", Local: key},
+			Attr: []xml.Attr{},
+		}
+		if err := e.EncodeElement(value, elem); err != nil {
+			return err
+		}
+	}
+
+	return e.EncodeToken(xml.EndElement{Name: start.Name})
+}
+
+func assert1(guard bool, text string) {
+	if !guard {
+		panic(text)
+	}
+}
+
+func filterFlags(content string) string {
+	for i, char := range content {
+		if char == ' ' || char == ';' {
+			return content[:i]
+		}
+	}
+	return content
+}
+
+func chooseData(custom, wildcard interface{}) interface{} {
+	if custom == nil {
+		if wildcard == nil {
+			panic("negotiation config is invalid")
+		}
+		return wildcard
+	}
+	return custom
+}
+
+func parseAccept(acceptHeader string) []string {
+	parts := strings.Split(acceptHeader, ",")
+	out := make([]string, 0, len(parts))
+	for _, part := range parts {
+		if part = strings.TrimSpace(strings.Split(part, ";")[0]); part != "" {
+			out = append(out, part)
+		}
+	}
+	return out
+}
+
+func lastChar(str string) uint8 {
+	if str == "" {
+		panic("The length of the string can't be 0")
+	}
+	return str[len(str)-1]
+}
+
+func nameOfFunction(f interface{}) string {
+	return runtime.FuncForPC(reflect.ValueOf(f).Pointer()).Name()
+}
+
+func joinPaths(absolutePath, relativePath string) string {
+	if relativePath == "" {
+		return absolutePath
+	}
+
+	finalPath := path.Join(absolutePath, relativePath)
+	appendSlash := lastChar(relativePath) == '/' && lastChar(finalPath) != '/'
+	if appendSlash {
+		return finalPath + "/"
+	}
+	return finalPath
+}
+
+func resolveAddress(addr []string) string {
+	switch len(addr) {
+	case 0:
+		if port := os.Getenv("PORT"); port != "" {
+			debugPrint("Environment variable PORT=\"%s\"", port)
+			return ":" + port
+		}
+		debugPrint("Environment variable PORT is undefined. Using port :8080 by default")
+		return ":8080"
+	case 1:
+		return addr[0]
+	default:
+		panic("too much parameters")
+	}
+}

backend/vendor/github.com/gin-gonic/gin/version.go

@@ -0,0 +1,8 @@
+// Copyright 2018 Gin Core Team.  All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+package gin
+
+// Version is the current gin framework's version.
+const Version = "v1.4.0"

backend/vendor/github.com/globalsign/mgo/.gitignore

@@ -0,0 +1,2 @@
+_harness
+.vscode

backend/vendor/github.com/globalsign/mgo/.travis.yml

@@ -0,0 +1,49 @@
+language: go
+
+go_import_path: github.com/globalsign/mgo
+
+go:
+    - 1.9.x
+    - 1.10.x
+
+env:
+    global:
+        - BUCKET=https://s3.eu-west-2.amazonaws.com/globalsign-mgo
+        - FASTDL=https://fastdl.mongodb.org/linux
+    matrix:
+        - MONGODB=x86_64-ubuntu1404-3.0.15
+        - MONGODB=x86_64-ubuntu1404-3.2.17
+        - MONGODB=x86_64-ubuntu1404-3.4.10
+        - MONGODB=x86_64-ubuntu1404-3.6.0
+
+install:
+
+    - wget $FASTDL/mongodb-linux-$MONGODB.tgz
+    - tar xzvf mongodb-linux-$MONGODB.tgz
+    - export PATH=$PWD/mongodb-linux-$MONGODB/bin:$PATH
+
+    - wget $BUCKET/daemontools.tar.gz
+    - tar xzvf daemontools.tar.gz
+    - export PATH=$PWD/daemontools:$PATH
+
+    - go get gopkg.in/check.v1
+    - go get gopkg.in/yaml.v2
+    - go get gopkg.in/tomb.v2
+    - go get golang.org/x/lint/golint
+
+before_script:
+    - golint  ./... | grep -v 'ID' | cat
+    - go vet github.com/globalsign/mgo/bson github.com/globalsign/mgo/txn github.com/globalsign/mgo 
+    - export NOIPV6=1
+    - make startdb
+
+script:
+    - (cd bson && go test -check.v)
+    - go test -check.v -fast
+    - (cd txn && go test -check.v)
+    - make stopdb
+
+git:
+  depth: 3
+
+# vim:sw=4:ts=4:et

backend/vendor/github.com/globalsign/mgo/CONTRIBUTING.md

@@ -0,0 +1,14 @@
+Contributing
+-------------------------
+
+We really appreciate contributions, but they must meet the following requirements:
+
+* A PR should have a brief description of the problem/feature being proposed
+* Pull requests should target the `development` branch
+* Existing tests should pass and any new code should be covered with it's own test(s) (use [travis-ci](https://travis-ci.org))
+* New functions should be [documented](https://blog.golang.org/godoc-documenting-go-code) clearly
+* Code should pass `golint`, `go vet` and `go fmt`
+
+We merge PRs into `development`, which is then tested in a sharded, replicated environment in our datacenter for regressions. Once everyone is happy, we merge to master - this is to maintain a bit of quality control past the usual PR process.
+
+**Thanks** for helping!

backend/vendor/github.com/globalsign/mgo/LICENSE

@@ -0,0 +1,25 @@
+mgo - MongoDB driver for Go
+
+Copyright (c) 2010-2013 - Gustavo Niemeyer <gustavo@niemeyer.net>
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met: 
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer. 
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution. 
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

backend/vendor/github.com/globalsign/mgo/Makefile

@@ -0,0 +1,5 @@
+startdb:
+	@harness/setup.sh start
+
+stopdb:
+	@harness/setup.sh stop

backend/vendor/github.com/globalsign/mgo/README.md

@@ -0,0 +1,105 @@
+[![Build Status](https://travis-ci.org/globalsign/mgo.svg?branch=master)](https://travis-ci.org/globalsign/mgo) [![GoDoc](https://godoc.org/github.com/globalsign/mgo?status.svg)](https://godoc.org/github.com/globalsign/mgo)
+
+The MongoDB driver for Go
+-------------------------
+
+This fork has had a few improvements by ourselves as well as several PR's merged from the original mgo repo that are currently awaiting review.
+Changes are mostly geared towards performance improvements and bug fixes, though a few new features have been added.
+
+Further PR's (with tests) are welcome, but please maintain backwards compatibility.
+
+Detailed documentation of the API is available at
+[GoDoc](https://godoc.org/github.com/globalsign/mgo).
+
+A [sub-package](https://godoc.org/github.com/globalsign/mgo/bson) that implements the [BSON](http://bsonspec.org) specification is also included, and may be used independently of the driver.
+
+## Supported Versions
+
+`mgo` is known to work well on (and has integration tests against) MongoDB v3.0, 3.2, 3.4 and 3.6. 
+
+MongoDB 4.0 is currently experimental - we would happily accept PRs to help improve support!
+
+## Changes
+* Fixes attempting to authenticate before every query ([details](https://github.com/go-mgo/mgo/issues/254))
+* Removes bulk update / delete batch size limitations ([details](https://github.com/go-mgo/mgo/issues/288))
+* Adds native support for `time.Duration` marshalling ([details](https://github.com/go-mgo/mgo/pull/373))
+* Reduce memory footprint / garbage collection pressure by reusing buffers ([details](https://github.com/go-mgo/mgo/pull/229), [more](https://github.com/globalsign/mgo/pull/56))
+* Support majority read concerns ([details](https://github.com/globalsign/mgo/pull/2))
+* Improved connection handling ([details](https://github.com/globalsign/mgo/pull/5))
+* Hides SASL warnings ([details](https://github.com/globalsign/mgo/pull/7))
+* Support for partial indexes ([details](https://github.com/domodwyer/mgo/commit/5efe8eccb028238d93c222828cae4806aeae9f51))
+* Fixes timezone handling ([details](https://github.com/go-mgo/mgo/pull/464))
+* Integration tests run against MongoDB 3.2 & 3.4 releases ([details](https://github.com/globalsign/mgo/pull/4), [more](https://github.com/globalsign/mgo/pull/24), [more](https://github.com/globalsign/mgo/pull/35))
+* Improved multi-document transaction performance ([details](https://github.com/globalsign/mgo/pull/10), [more](https://github.com/globalsign/mgo/pull/11), [more](https://github.com/globalsign/mgo/pull/16))
+* Fixes cursor timeouts ([details](https://jira.mongodb.org/browse/SERVER-24899))
+* Support index hints and timeouts for count queries ([details](https://github.com/globalsign/mgo/pull/17))
+* Don't panic when handling indexed `int64` fields ([details](https://github.com/go-mgo/mgo/issues/475))
+* Supports dropping all indexes on a collection ([details](https://github.com/globalsign/mgo/pull/25))
+* Annotates log entries/profiler output with optional appName on 3.4+ ([details](https://github.com/globalsign/mgo/pull/28))
+* Support for read-only [views](https://docs.mongodb.com/manual/core/views/) in 3.4+ ([details](https://github.com/globalsign/mgo/pull/33))
+* Support for [collations](https://docs.mongodb.com/manual/reference/collation/) in 3.4+ ([details](https://github.com/globalsign/mgo/pull/37), [more](https://github.com/globalsign/mgo/pull/166))
+* Provide BSON constants for convenience/sanity ([details](https://github.com/globalsign/mgo/pull/41))
+* Consistently unmarshal time.Time values as UTC ([details](https://github.com/globalsign/mgo/pull/42))
+* Enforces best practise coding guidelines ([details](https://github.com/globalsign/mgo/pull/44))
+* GetBSON correctly handles structs with both fields and pointers ([details](https://github.com/globalsign/mgo/pull/40))
+* Improved bson.Raw unmarshalling performance ([details](https://github.com/globalsign/mgo/pull/49))
+* Minimise socket connection timeouts due to excessive locking ([details](https://github.com/globalsign/mgo/pull/52))
+* Natively support X509 client authentication ([details](https://github.com/globalsign/mgo/pull/55))
+* Gracefully recover from a temporarily unreachable server ([details](https://github.com/globalsign/mgo/pull/69))
+* Use JSON tags when no explicit BSON are tags set ([details](https://github.com/globalsign/mgo/pull/91))
+* Support [$changeStream](https://docs.mongodb.com/manual/changeStreams/) tailing on 3.6+ ([details](https://github.com/globalsign/mgo/pull/97))
+* Fix deadlock in cluster synchronisation ([details](https://github.com/globalsign/mgo/issues/120))
+* Implement `maxIdleTimeout` for pooled connections ([details](https://github.com/globalsign/mgo/pull/116))
+* Connection pool waiting improvements ([details](https://github.com/globalsign/mgo/pull/115))
+* Fixes BSON encoding for `$in` and friends ([details](https://github.com/globalsign/mgo/pull/128))
+* Add BSON stream encoders ([details](https://github.com/globalsign/mgo/pull/127))
+* Add integer map key support in the BSON encoder ([details](https://github.com/globalsign/mgo/pull/140)) 
+* Support aggregation [collations](https://docs.mongodb.com/manual/reference/collation/) ([details](https://github.com/globalsign/mgo/pull/144))
+* Support encoding of inline struct references ([details](https://github.com/globalsign/mgo/pull/146))
+* Improved windows test harness ([details](https://github.com/globalsign/mgo/pull/158))
+* Improved type and nil handling in the BSON codec ([details](https://github.com/globalsign/mgo/pull/147/files), [more](https://github.com/globalsign/mgo/pull/181))
+* Separated network read/write timeouts ([details](https://github.com/globalsign/mgo/pull/161))
+* Expanded dial string configuration options ([details](https://github.com/globalsign/mgo/pull/162))
+* Implement MongoTimestamp ([details](https://github.com/globalsign/mgo/pull/171))
+* Support setting `writeConcern` for `findAndModify` operations ([details](https://github.com/globalsign/mgo/pull/185))
+* Add `ssl` to the dial string options ([details](https://github.com/globalsign/mgo/pull/184))
+
+
+---
+
+### Thanks to
+* @aksentyev
+* @bachue
+* @bozaro
+* @BenLubar
+* @carldunham
+* @carter2000
+* @cedric-cordenier
+* @cezarsa
+* @DaytonG
+* @ddspog
+* @drichelson
+* @dvic
+* @eaglerayp
+* @feliixx
+* @fmpwizard
+* @gazoon
+* @gedge
+* @gnawux
+* @idy
+* @jameinel
+* @jefferickson
+* @johnlawsharrison
+* @KJTsanaktsidis
+* @larrycinnabar
+* @mapete94
+* @maxnoel
+* @mcspring
+* @Mei-Zhao
+* @peterdeka
+* @Reenjii
+* @roobre
+* @smoya
+* @steve-gray
+* @tbruyelle
+* @wgallagher

backend/vendor/github.com/globalsign/mgo/auth.go

@@ -0,0 +1,467 @@
+// mgo - MongoDB driver for Go
+//
+// Copyright (c) 2010-2012 - Gustavo Niemeyer <gustavo@niemeyer.net>
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this
+//    list of conditions and the following disclaimer.
+// 2. Redistributions in binary form must reproduce the above copyright notice,
+//    this list of conditions and the following disclaimer in the documentation
+//    and/or other materials provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package mgo
+
+import (
+	"crypto/md5"
+	"crypto/sha1"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"sync"
+
+	"github.com/globalsign/mgo/bson"
+	"github.com/globalsign/mgo/internal/scram"
+)
+
+type authCmd struct {
+	Authenticate int
+
+	Nonce string
+	User  string
+	Key   string
+}
+
+type startSaslCmd struct {
+	StartSASL int `bson:"startSasl"`
+}
+
+type authResult struct {
+	ErrMsg string
+	Ok     bool
+}
+
+type getNonceCmd struct {
+	GetNonce int
+}
+
+type getNonceResult struct {
+	Nonce string
+	Err   string `bson:"$err"`
+	Code  int
+}
+
+type logoutCmd struct {
+	Logout int
+}
+
+type saslCmd struct {
+	Start          int    `bson:"saslStart,omitempty"`
+	Continue       int    `bson:"saslContinue,omitempty"`
+	ConversationId int    `bson:"conversationId,omitempty"`
+	Mechanism      string `bson:"mechanism,omitempty"`
+	Payload        []byte
+}
+
+type saslResult struct {
+	Ok    bool `bson:"ok"`
+	NotOk bool `bson:"code"` // Server <= 2.3.2 returns ok=1 & code>0 on errors (WTF?)
+	Done  bool
+
+	ConversationId int `bson:"conversationId"`
+	Payload        []byte
+	ErrMsg         string
+}
+
+type saslStepper interface {
+	Step(serverData []byte) (clientData []byte, done bool, err error)
+	Close()
+}
+
+func (socket *mongoSocket) getNonce() (nonce string, err error) {
+	socket.Lock()
+	for socket.cachedNonce == "" && socket.dead == nil {
+		debugf("Socket %p to %s: waiting for nonce", socket, socket.addr)
+		socket.gotNonce.Wait()
+	}
+	if socket.cachedNonce == "mongos" {
+		socket.Unlock()
+		return "", errors.New("Can't authenticate with mongos; see http://j.mp/mongos-auth")
+	}
+	debugf("Socket %p to %s: got nonce", socket, socket.addr)
+	nonce, err = socket.cachedNonce, socket.dead
+	socket.cachedNonce = ""
+	socket.Unlock()
+	if err != nil {
+		nonce = ""
+	}
+	return
+}
+
+func (socket *mongoSocket) resetNonce() {
+	debugf("Socket %p to %s: requesting a new nonce", socket, socket.addr)
+	op := &queryOp{}
+	op.query = &getNonceCmd{GetNonce: 1}
+	op.collection = "admin.$cmd"
+	op.limit = -1
+	op.replyFunc = func(err error, reply *replyOp, docNum int, docData []byte) {
+		if err != nil {
+			socket.kill(errors.New("getNonce: "+err.Error()), true)
+			return
+		}
+		result := &getNonceResult{}
+		err = bson.Unmarshal(docData, &result)
+		if err != nil {
+			socket.kill(errors.New("Failed to unmarshal nonce: "+err.Error()), true)
+			return
+		}
+		debugf("Socket %p to %s: nonce unmarshalled: %#v", socket, socket.addr, result)
+		if result.Code == 13390 {
+			// mongos doesn't yet support auth (see http://j.mp/mongos-auth)
+			result.Nonce = "mongos"
+		} else if result.Nonce == "" {
+			var msg string
+			if result.Err != "" {
+				msg = fmt.Sprintf("Got an empty nonce: %s (%d)", result.Err, result.Code)
+			} else {
+				msg = "Got an empty nonce"
+			}
+			socket.kill(errors.New(msg), true)
+			return
+		}
+		socket.Lock()
+		if socket.cachedNonce != "" {
+			socket.Unlock()
+			panic("resetNonce: nonce already cached")
+		}
+		socket.cachedNonce = result.Nonce
+		socket.gotNonce.Signal()
+		socket.Unlock()
+	}
+	err := socket.Query(op)
+	if err != nil {
+		socket.kill(errors.New("resetNonce: "+err.Error()), true)
+	}
+}
+
+func (socket *mongoSocket) Login(cred Credential) error {
+	socket.Lock()
+	if cred.Mechanism == "" && socket.serverInfo.MaxWireVersion >= 3 {
+		cred.Mechanism = "SCRAM-SHA-1"
+	}
+	for _, sockCred := range socket.creds {
+		if sockCred == cred {
+			debugf("Socket %p to %s: login: db=%q user=%q (already logged in)", socket, socket.addr, cred.Source, cred.Username)
+			socket.Unlock()
+			return nil
+		}
+	}
+	if socket.dropLogout(cred) {
+		debugf("Socket %p to %s: login: db=%q user=%q (cached)", socket, socket.addr, cred.Source, cred.Username)
+		socket.creds = append(socket.creds, cred)
+		socket.Unlock()
+		return nil
+	}
+	socket.Unlock()
+
+	debugf("Socket %p to %s: login: db=%q user=%q", socket, socket.addr, cred.Source, cred.Username)
+
+	var err error
+	switch cred.Mechanism {
+	case "", "MONGODB-CR", "MONGO-CR": // Name changed to MONGODB-CR in SERVER-8501.
+		err = socket.loginClassic(cred)
+	case "PLAIN":
+		err = socket.loginPlain(cred)
+	case "MONGODB-X509":
+		err = socket.loginX509(cred)
+	default:
+		// Try SASL for everything else, if it is available.
+		err = socket.loginSASL(cred)
+	}
+
+	if err != nil {
+		debugf("Socket %p to %s: login error: %s", socket, socket.addr, err)
+	} else {
+		debugf("Socket %p to %s: login successful", socket, socket.addr)
+	}
+	return err
+}
+
+func (socket *mongoSocket) loginClassic(cred Credential) error {
+	// Note that this only works properly because this function is
+	// synchronous, which means the nonce won't get reset while we're
+	// using it and any other login requests will block waiting for a
+	// new nonce provided in the defer call below.
+	nonce, err := socket.getNonce()
+	if err != nil {
+		return err
+	}
+	defer socket.resetNonce()
+
+	psum := md5.New()
+	psum.Write([]byte(cred.Username + ":mongo:" + cred.Password))
+
+	ksum := md5.New()
+	ksum.Write([]byte(nonce + cred.Username))
+	ksum.Write([]byte(hex.EncodeToString(psum.Sum(nil))))
+
+	key := hex.EncodeToString(ksum.Sum(nil))
+
+	cmd := authCmd{Authenticate: 1, User: cred.Username, Nonce: nonce, Key: key}
+	res := authResult{}
+	return socket.loginRun(cred.Source, &cmd, &res, func() error {
+		if !res.Ok {
+			return errors.New(res.ErrMsg)
+		}
+		socket.Lock()
+		socket.dropAuth(cred.Source)
+		socket.creds = append(socket.creds, cred)
+		socket.Unlock()
+		return nil
+	})
+}
+
+type authX509Cmd struct {
+	Authenticate int
+	User         string
+	Mechanism    string
+}
+
+func (socket *mongoSocket) loginX509(cred Credential) error {
+	cmd := authX509Cmd{Authenticate: 1, User: cred.Username, Mechanism: "MONGODB-X509"}
+	res := authResult{}
+	return socket.loginRun(cred.Source, &cmd, &res, func() error {
+		if !res.Ok {
+			return errors.New(res.ErrMsg)
+		}
+		socket.Lock()
+		socket.dropAuth(cred.Source)
+		socket.creds = append(socket.creds, cred)
+		socket.Unlock()
+		return nil
+	})
+}
+
+func (socket *mongoSocket) loginPlain(cred Credential) error {
+	cmd := saslCmd{Start: 1, Mechanism: "PLAIN", Payload: []byte("\x00" + cred.Username + "\x00" + cred.Password)}
+	res := authResult{}
+	return socket.loginRun(cred.Source, &cmd, &res, func() error {
+		if !res.Ok {
+			return errors.New(res.ErrMsg)
+		}
+		socket.Lock()
+		socket.dropAuth(cred.Source)
+		socket.creds = append(socket.creds, cred)
+		socket.Unlock()
+		return nil
+	})
+}
+
+func (socket *mongoSocket) loginSASL(cred Credential) error {
+	var sasl saslStepper
+	var err error
+	if cred.Mechanism == "SCRAM-SHA-1" {
+		// SCRAM is handled without external libraries.
+		sasl = saslNewScram(cred)
+	} else if len(cred.ServiceHost) > 0 {
+		sasl, err = saslNew(cred, cred.ServiceHost)
+	} else {
+		sasl, err = saslNew(cred, socket.Server().Addr)
+	}
+	if err != nil {
+		return err
+	}
+	defer sasl.Close()
+
+	// The goal of this logic is to carry a locked socket until the
+	// local SASL step confirms the auth is valid; the socket needs to be
+	// locked so that concurrent action doesn't leave the socket in an
+	// auth state that doesn't reflect the operations that took place.
+	// As a simple case, imagine inverting login=>logout to logout=>login.
+	//
+	// The logic below works because the lock func isn't called concurrently.
+	locked := false
+	lock := func(b bool) {
+		if locked != b {
+			locked = b
+			if b {
+				socket.Lock()
+			} else {
+				socket.Unlock()
+			}
+		}
+	}
+
+	lock(true)
+	defer lock(false)
+
+	start := 1
+	cmd := saslCmd{}
+	res := saslResult{}
+	for {
+		payload, done, err := sasl.Step(res.Payload)
+		if err != nil {
+			return err
+		}
+		if done && res.Done {
+			socket.dropAuth(cred.Source)
+			socket.creds = append(socket.creds, cred)
+			break
+		}
+		lock(false)
+
+		cmd = saslCmd{
+			Start:          start,
+			Continue:       1 - start,
+			ConversationId: res.ConversationId,
+			Mechanism:      cred.Mechanism,
+			Payload:        payload,
+		}
+		start = 0
+		err = socket.loginRun(cred.Source, &cmd, &res, func() error {
+			// See the comment on lock for why this is necessary.
+			lock(true)
+			if !res.Ok || res.NotOk {
+				return fmt.Errorf("server returned error on SASL authentication step: %s", res.ErrMsg)
+			}
+			return nil
+		})
+		if err != nil {
+			return err
+		}
+		if done && res.Done {
+			socket.dropAuth(cred.Source)
+			socket.creds = append(socket.creds, cred)
+			break
+		}
+	}
+
+	return nil
+}
+
+func saslNewScram(cred Credential) *saslScram {
+	credsum := md5.New()
+	credsum.Write([]byte(cred.Username + ":mongo:" + cred.Password))
+	client := scram.NewClient(sha1.New, cred.Username, hex.EncodeToString(credsum.Sum(nil)))
+	return &saslScram{cred: cred, client: client}
+}
+
+type saslScram struct {
+	cred   Credential
+	client *scram.Client
+}
+
+func (s *saslScram) Close() {}
+
+func (s *saslScram) Step(serverData []byte) (clientData []byte, done bool, err error) {
+	more := s.client.Step(serverData)
+	return s.client.Out(), !more, s.client.Err()
+}
+
+func (socket *mongoSocket) loginRun(db string, query, result interface{}, f func() error) error {
+	var mutex sync.Mutex
+	var replyErr error
+	mutex.Lock()
+
+	op := queryOp{}
+	op.query = query
+	op.collection = db + ".$cmd"
+	op.limit = -1
+	op.replyFunc = func(err error, reply *replyOp, docNum int, docData []byte) {
+		defer mutex.Unlock()
+
+		if err != nil {
+			replyErr = err
+			return
+		}
+
+		err = bson.Unmarshal(docData, result)
+		if err != nil {
+			replyErr = err
+		} else {
+			// Must handle this within the read loop for the socket, so
+			// that concurrent login requests are properly ordered.
+			replyErr = f()
+		}
+	}
+
+	err := socket.Query(&op)
+	if err != nil {
+		return err
+	}
+	mutex.Lock() // Wait.
+	return replyErr
+}
+
+func (socket *mongoSocket) Logout(db string) {
+	socket.Lock()
+	cred, found := socket.dropAuth(db)
+	if found {
+		debugf("Socket %p to %s: logout: db=%q (flagged)", socket, socket.addr, db)
+		socket.logout = append(socket.logout, cred)
+	}
+	socket.Unlock()
+}
+
+func (socket *mongoSocket) LogoutAll() {
+	socket.Lock()
+	if l := len(socket.creds); l > 0 {
+		debugf("Socket %p to %s: logout all (flagged %d)", socket, socket.addr, l)
+		socket.logout = append(socket.logout, socket.creds...)
+		socket.creds = socket.creds[0:0]
+	}
+	socket.Unlock()
+}
+
+func (socket *mongoSocket) flushLogout() (ops []interface{}) {
+	socket.Lock()
+	if l := len(socket.logout); l > 0 {
+		debugf("Socket %p to %s: logout all (flushing %d)", socket, socket.addr, l)
+		for i := 0; i != l; i++ {
+			op := queryOp{}
+			op.query = &logoutCmd{1}
+			op.collection = socket.logout[i].Source + ".$cmd"
+			op.limit = -1
+			ops = append(ops, &op)
+		}
+		socket.logout = socket.logout[0:0]
+	}
+	socket.Unlock()
+	return
+}
+
+func (socket *mongoSocket) dropAuth(db string) (cred Credential, found bool) {
+	for i, sockCred := range socket.creds {
+		if sockCred.Source == db {
+			copy(socket.creds[i:], socket.creds[i+1:])
+			socket.creds = socket.creds[:len(socket.creds)-1]
+			return sockCred, true
+		}
+	}
+	return cred, false
+}
+
+func (socket *mongoSocket) dropLogout(cred Credential) (found bool) {
+	for i, sockCred := range socket.logout {
+		if sockCred == cred {
+			copy(socket.logout[i:], socket.logout[i+1:])
+			socket.logout = socket.logout[:len(socket.logout)-1]
+			return true
+		}
+	}
+	return false
+}