Add shareable extension-to-MIME-type mapping (#1355)

## What is this PR doing?

This PR switches from a hard-coded MIME type list to a JSON based
extention-to-MIME-type mapping.

## What problem is it solving?

PHPRequestHandler and the WP Cloud PHP request handler use different
MIME type mappings.

## How is the problem addressed?

This PR adds a JSON file that can be used by both. Both lists contained
file extensions the other did not, so the new mapping combines both.

GitHub co-pilot was handy for:
- quickly converting the existing MIME type switch statement to JSON
- sorting and removing duplicate keys from the combined mapping in JSON

The WP Cloud PHP request handler will be updated to use the mapping JSON
in a separate PR.

## Testing Instructions

- Smoke test Playground locally
- Make sure e2e tests pass

packages/php-wasm/universal/src/lib/mime-types.json

@@ -0,0 +1,96 @@
+{
+	"_default": "application-octet-stream",
+	"3gpp": "video/3gpp",
+	"7z": "application/x-7z-compressed",
+	"asx": "video/x-ms-asf",
+	"atom": "application/atom+xml",
+	"avi": "video/x-msvideo",
+	"avif": "image/avif",
+	"bin": "application/octet-stream",
+	"bmp": "image/x-ms-bmp",
+	"cco": "application/x-cocoa",
+	"css": "text/css",
+	"data": "application/octet-stream",
+	"deb": "application/octet-stream",
+	"der": "application/x-x509-ca-cert",
+	"dmg": "application/octet-stream",
+	"doc": "application/msword",
+	"docx": "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+	"eot": "application/vnd.ms-fontobject",
+	"flv": "video/x-flv",
+	"gif": "image/gif",
+	"gz": "application/gzip",
+	"hqx": "application/mac-binhex40",
+	"htc": "text/x-component",
+	"html": "text/html",
+	"ico": "image/x-icon",
+	"iso": "application/octet-stream",
+	"jad": "text/vnd.sun.j2me.app-descriptor",
+	"jar": "application/java-archive",
+	"jardiff": "application/x-java-archive-diff",
+	"jng": "image/x-jng",
+	"jnlp": "application/x-java-jnlp-file",
+	"jpg": "image/jpeg",
+	"jpeg": "image/jpeg",
+	"js": "application/javascript",
+	"json": "application/json",
+	"kml": "application/vnd.google-earth.kml+xml",
+	"kmz": "application/vnd.google-earth.kmz",
+	"m3u8": "application/vnd.apple.mpegurl",
+	"m4a": "audio/x-m4a",
+	"m4v": "video/x-m4v",
+	"md": "text/plain",
+	"mid": "audio/midi",
+	"mml": "text/mathml",
+	"mng": "video/x-mng",
+	"mov": "video/quicktime",
+	"mp3": "audio/mpeg",
+	"mp4": "video/mp4",
+	"mpeg": "video/mpeg",
+	"msi": "application/octet-stream",
+	"odg": "application/vnd.oasis.opendocument.graphics",
+	"odp": "application/vnd.oasis.opendocument.presentation",
+	"ods": "application/vnd.oasis.opendocument.spreadsheet",
+	"odt": "application/vnd.oasis.opendocument.text",
+	"ogg": "audio/ogg",
+	"otf": "font/otf",
+	"pdf": "application/pdf",
+	"pl": "application/x-perl",
+	"png": "image/png",
+	"ppt": "application/vnd.ms-powerpoint",
+	"pptx": "application/vnd.openxmlformats-officedocument.presentationml.presentation",
+	"prc": "application/x-pilot",
+	"ps": "application/postscript",
+	"ra": "audio/x-realaudio",
+	"rar": "application/x-rar-compressed",
+	"rpm": "application/x-redhat-package-manager",
+	"rss": "application/rss+xml",
+	"rtf": "application/rtf",
+	"run": "application/x-makeself",
+	"sea": "application/x-sea",
+	"sit": "application/x-stuffit",
+	"svg": "image/svg+xml",
+	"swf": "application/x-shockwave-flash",
+	"tcl": "application/x-tcl",
+	"tar": "application/x-tar",
+	"tif": "image/tiff",
+	"ts": "video/mp2t",
+	"ttf": "font/ttf",
+	"txt": "text/plain",
+	"wasm": "application/wasm",
+	"wbmp": "image/vnd.wap.wbmp",
+	"webm": "video/webm",
+	"webp": "image/webp",
+	"wml": "text/vnd.wap.wml",
+	"wmlc": "application/vnd.wap.wmlc",
+	"wmv": "video/x-ms-wmv",
+	"woff": "font/woff",
+	"woff2": "font/woff2",
+	"xhtml": "application/xhtml+xml",
+	"xls": "application/vnd.ms-excel",
+	"xlsx": "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+	"xml": "text/xml",
+	"xpi": "application/x-xpinstall",
+	"xspf": "application/xspf+xml",
+	"zip": "application/zip"
+}

packages/php-wasm/universal/src/lib/php-request-handler.ts

@@ -20,6 +20,7 @@ import {
 	SpawnedPHP,
 } from './php-process-manager';
 import { HttpCookieStore } from './http-cookie-store';
+import mimeTypes from './mime-types.json';
 
 export type RewriteRule = {
 	match: RegExp;
@@ -499,77 +500,8 @@ export class PHPRequestHandler<PHP extends BasePHP> {
  * @returns The inferred mime type.
  */
 function inferMimeType(path: string): string {
-	const extension = path.split('.').pop();
-	switch (extension) {
-		case 'css':
-			return 'text/css';
-		case 'js':
-			return 'application/javascript';
-		case 'png':
-			return 'image/png';
-		case 'jpg':
-		case 'jpeg':
-			return 'image/jpeg';
-		case 'gif':
-			return 'image/gif';
-		case 'svg':
-			return 'image/svg+xml';
-		case 'woff':
-			return 'font/woff';
-		case 'woff2':
-			return 'font/woff2';
-		case 'ttf':
-			return 'font/ttf';
-		case 'otf':
-			return 'font/otf';
-		case 'eot':
-			return 'font/eot';
-		case 'ico':
-			return 'image/x-icon';
-		case 'html':
-			return 'text/html';
-		case 'json':
-			return 'application/json';
-		case 'xml':
-			return 'application/xml';
-		case 'txt':
-		case 'md':
-			return 'text/plain';
-		case 'pdf':
-			return 'application/pdf';
-		case 'webp':
-			return 'image/webp';
-		case 'mp3':
-			return 'audio/mpeg';
-		case 'mp4':
-			return 'video/mp4';
-		case 'csv':
-			return 'text/csv';
-		case 'xls':
-			return 'application/vnd.ms-excel';
-		case 'xlsx':
-			return 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
-		case 'doc':
-			return 'application/msword';
-		case 'docx':
-			return 'application/vnd.openxmlformats-officedocument.wordprocessingml.document';
-		case 'ppt':
-			return 'application/vnd.ms-powerpoint';
-		case 'pptx':
-			return 'application/vnd.openxmlformats-officedocument.presentationml.presentation';
-		case 'zip':
-			return 'application/zip';
-		case 'rar':
-			return 'application/x-rar-compressed';
-		case 'tar':
-			return 'application/x-tar';
-		case 'gz':
-			return 'application/gzip';
-		case '7z':
-			return 'application/x-7z-compressed';
-		default:
-			return 'application-octet-stream';
-	}
+	const extension = path.split('.').pop() as keyof typeof mimeTypes;
+	return mimeTypes[extension] || mimeTypes['_default'];
 }
 
 /**