Companion build (#25648)

companion/api/server.ts

@@ -0,0 +1,83 @@
+import { createReadStream, existsSync } from "fs";
+import { promises as fs } from "fs";
+import { IncomingMessage, ServerResponse } from "http";
+import { extname, join, normalize } from "path";
+
+const distDir = join(process.cwd(), "dist");
+
+const mimeTypes: Record<string, string> = {
+  ".html": "text/html; charset=utf-8",
+  ".js": "application/javascript; charset=utf-8",
+  ".css": "text/css; charset=utf-8",
+  ".json": "application/json; charset=utf-8",
+  ".png": "image/png",
+  ".jpg": "image/jpeg",
+  ".jpeg": "image/jpeg",
+  ".svg": "image/svg+xml",
+  ".ico": "image/x-icon",
+  ".woff": "font/woff",
+  ".woff2": "font/woff2",
+  ".ttf": "font/ttf",
+  ".map": "application/json; charset=utf-8",
+};
+
+const getSafePath = (urlPath: string): string => {
+  const decodedPath = decodeURIComponent(urlPath.split("?")[0]);
+  const normalized = normalize(decodedPath).replace(/^(\.\.(\/|\\|$))+/, "");
+  return normalized.startsWith("/") ? normalized : `/${normalized}`;
+};
+
+const resolveFilePath = async (safePath: string): Promise<string> => {
+  let candidate = join(distDir, safePath);
+  try {
+    const stats = await fs.stat(candidate);
+    if (stats.isDirectory()) {
+      candidate = join(candidate, "index.html");
+    }
+    return candidate;
+  } catch {
+    const fallback = join(distDir, "index.html");
+    if (existsSync(fallback)) {
+      return fallback;
+    }
+    throw new Error("Dist folder missing. Run `npm run build` before deploying.");
+  }
+};
+
+const sendFile = (res: ServerResponse, filePath: string) => {
+  const ext = extname(filePath).toLowerCase();
+  const contentType = mimeTypes[ext] || "application/octet-stream";
+  res.setHeader("Content-Type", contentType);
+  res.setHeader(
+    "Cache-Control",
+    ext === ".html" ? "no-cache, no-store, must-revalidate" : "public, max-age=31536000, immutable"
+  );
+
+  const stream = createReadStream(filePath);
+  stream.on("error", (error) => {
+    console.error("Failed to read file:", error);
+    res.statusCode = 500;
+    res.end("Internal Server Error");
+  });
+  stream.pipe(res);
+};
+
+export default async function handler(req: IncomingMessage, res: ServerResponse) {
+  if (req.method && !["GET", "HEAD"].includes(req.method)) {
+    res.statusCode = 405;
+    res.setHeader("Allow", "GET, HEAD");
+    res.end("Method Not Allowed");
+    return;
+  }
+
+  try {
+    const urlPath = req.url ?? "/";
+    const safePath = getSafePath(urlPath);
+    const filePath = await resolveFilePath(safePath);
+    sendFile(res, filePath);
+  } catch (error) {
+    console.error("Server render error:", error);
+    res.statusCode = 500;
+    res.end("Internal Server Error");
+  }
+}

companion/vercel.json

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+{
+  "routes": [
+    {
+      "handle": "filesystem"
+    },
+    {
+      "src": "/.*",
+      "dest": "/index.html"
+    }
+  ]
+}