1 files changed, 62 insertions, 0 deletions
diff --git a/packages/integrations/vercel/src/serverless/entrypoint.ts b/packages/integrations/vercel/src/serverless/entrypoint.ts
new file mode 100644
index 000000000..a881d701a
--- /dev/null
+++ b/packages/integrations/vercel/src/serverless/entrypoint.ts
@@ -0,0 +1,62 @@
+import type { IncomingMessage, ServerResponse } from 'node:http';
+import type { SSRManifest } from 'astro';
+import { NodeApp, applyPolyfills } from 'astro/app/node';
+import {
+	ASTRO_LOCALS_HEADER,
+	ASTRO_MIDDLEWARE_SECRET_HEADER,
+	ASTRO_PATH_HEADER,
+	ASTRO_PATH_PARAM,
+} from './adapter.js';
+
+// Run polyfills immediately so any dependent code can use the globals
+applyPolyfills();
+
+// Won't throw if the virtual module is not available because it's not supported in
+// the users's astro version or if astro:env is not enabled in the project
+await import('astro/env/setup')
+	.then((mod) => mod.setGetEnv((key) => process.env[key]))
+	.catch(() => {});
+
+export const createExports = (
+	manifest: SSRManifest,
+	{ middlewareSecret, skewProtection }: { middlewareSecret: string; skewProtection: boolean },
+) => {
+	const app = new NodeApp(manifest);
+	const handler = async (req: IncomingMessage, res: ServerResponse) => {
+		const url = new URL(`https://example.com${req.url}`);
+		const clientAddress = req.headers['x-forwarded-for'] as string | undefined;
+		const localsHeader = req.headers[ASTRO_LOCALS_HEADER];
+		const middlewareSecretHeader = req.headers[ASTRO_MIDDLEWARE_SECRET_HEADER];
+		const realPath = req.headers[ASTRO_PATH_HEADER] ?? url.searchParams.get(ASTRO_PATH_PARAM);
+		if (typeof realPath === 'string') {
+			req.url = realPath;
+		}
+
+		let locals = {};
+		if (localsHeader) {
+			if (middlewareSecretHeader !== middlewareSecret) {
+				res.statusCode = 403;
+				res.end('Forbidden');
+				return;
+			}
+			locals =
+				typeof localsHeader === 'string' ? JSON.parse(localsHeader) : JSON.parse(localsHeader[0]);
+		}
+		// hide the secret from the rest of user code
+		delete req.headers[ASTRO_MIDDLEWARE_SECRET_HEADER];
+
+		// https://vercel.com/docs/deployments/skew-protection#supported-frameworks
+		if (skewProtection && process.env.VERCEL_SKEW_PROTECTION_ENABLED === '1') {
+			req.headers['x-deployment-id'] = process.env.VERCEL_DEPLOYMENT_ID;
+		}
+
+		const webResponse = await app.render(req, { addCookieHeader: true, clientAddress, locals });
+		await NodeApp.writeResponse(webResponse, res);
+	};
+
+	return { default: handler };
+};
+
+// HACK: prevent warning
+// @astrojs-ssr-virtual-entry (22:23) "start" is not exported by "dist/serverless/entrypoint.js", imported by "@astrojs-ssr-virtual-entry".
+export function start() {}