refactor: extract file serve to own module

server.ts

@@ -1,7 +1,6 @@
-import { contentType } from '@std/media-types'
-import { extname } from '@std/path'
 import { getBaseUrl, getSourceUrl } from './src/url_utils.ts'
 import { toUser, toUserDomain } from './src/user_utils.ts'
+import { serveFile } from './src/serve_file.ts'
 
 Deno.serve({ port: Number(Deno.env.get('PORT') ?? 8000) }, async (req) => {
 	const reqUrl = new URL(req.url)
@@ -21,20 +20,5 @@ Deno.serve({ port: Number(Deno.env.get('PORT') ?? 8000) }, async (req) => {
 	const fileUrl = getSourceUrl(filePath, baseUrl)
 
 	// Get source and mime type
-	const response = await fetch(fileUrl)
+	return serveFile(fileUrl)
-	const ext = extname(fileUrl.pathname)
-	const mimeType = contentType(ext) ?? 'text/plain; charset=utf-8' // Assume plain text as default.
-
-	if (response.ok) {
-		// Update content-type if not bin file
-		const headers = new Headers(response.headers)
-		if (headers.get('Content-Type') !== 'application/octet-stream') {
-			headers.set('Content-Type', mimeType)
-		}
-
-		// Stream original file to user
-		return new Response(response.body, { headers })
-	}
-
-	return response
 })

src/serve_file.ts

@@ -0,0 +1,22 @@
+import { extname } from '@std/path'
+import { contentType } from '@std/media-types'
+
+export async function serveFile(fileUrl: URL): Promise<Response> {
+	// Get source and mime type
+	const response = await fetch(fileUrl)
+	const ext = extname(fileUrl.pathname)
+	const mimeType = contentType(ext) ?? 'text/plain; charset=utf-8' // Assume plain text as default.
+
+	if (response.ok) {
+		// Update content-type if not bin file
+		const headers = new Headers(response.headers)
+		if (headers.get('Content-Type') !== 'application/octet-stream') {
+			headers.set('Content-Type', mimeType)
+		}
+		// Stream original file to user
+		return new Response(response.body, { headers })
+	}
+
+	// Return raw error if status !== 2XX
+	return response
+}