🎉 初始化项目

web-app/src/fetch-patch.js

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+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import mime from 'mime-types';
+import { serverDirectory } from './server-directory.js';
+import { getRequestURL, isFileURL, isPathUnderParent } from './util.js';
+
+const originalFetch = globalThis.fetch;
+
+const ALLOWED_EXTENSIONS = [
+    '.wasm',
+];
+
+// Patched fetch function that handles file URLs
+globalThis.fetch = async (/** @type {string | URL | Request} */ request, /** @type {RequestInit | undefined} */ options) => {
+    if (!isFileURL(request)) {
+        return originalFetch(request, options);
+    }
+    const url = getRequestURL(request);
+    const filePath = path.resolve(fileURLToPath(url));
+    const isUnderServerDirectory = isPathUnderParent(serverDirectory, filePath);
+    if (!isUnderServerDirectory) {
+        throw new Error('Requested file path is outside of the server directory.');
+    }
+    const parsedPath = path.parse(filePath);
+    if (!ALLOWED_EXTENSIONS.includes(parsedPath.ext)) {
+        throw new Error('Unsupported file extension.');
+    }
+    const fileName = parsedPath.base;
+    const buffer = await fs.promises.readFile(filePath);
+    const response = new Response(buffer, {
+        status: 200,
+        statusText: 'OK',
+        headers: {
+            'Content-Type': mime.lookup(fileName) || 'application/octet-stream',
+            'Content-Length': buffer.length.toString(),
+        },
+    });
+    return response;
+};