feat(markdown): add utility functions for parsing and stripping markdown

src/lib/server/utils/markdown/markdown.ts

@@ -0,0 +1,35 @@
+/**
+ * Markdown utility for parsing markdown to HTML
+ */
+
+import { marked } from 'marked';
+import sanitizeHtml from 'sanitize-html';
+
+/**
+ * Parse markdown to sanitized HTML
+ */
+export function parseMarkdown(markdown: string | null | undefined): string {
+	if (!markdown) return '';
+
+	// Parse markdown to HTML
+	const html = marked.parse(markdown) as string;
+
+	// Sanitize HTML to prevent XSS
+	return sanitizeHtml(html, {
+		allowedTags: sanitizeHtml.defaults.allowedTags.concat(['img', 'h1', 'h2']),
+		allowedAttributes: {
+			...sanitizeHtml.defaults.allowedAttributes,
+			img: ['src', 'alt', 'title']
+		}
+	});
+}
+
+/**
+ * Strip markdown formatting and return plain text
+ */
+export function stripMarkdown(markdown: string | null | undefined): string {
+	if (!markdown) return '';
+
+	const html = parseMarkdown(markdown);
+	return html.replace(/<[^>]*>/g, '').trim();
+}