Node.js standalone mode + support for astro preview (#5056)

* wip

* Deprecate buildConfig and move to config.build

* Implement the standalone server

* Stay backwards compat

* Add changesets

* correctly merge URLs

* Get config earlier

* update node tests

* Return the preview server

* update remaining tests

* swap usage and config ordering

* Update packages/astro/src/@types/astro.ts

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

* Update .changeset/metal-pumas-walk.md

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

* Update .changeset/metal-pumas-walk.md

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

* Update .changeset/stupid-points-refuse.md

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

* Update .changeset/stupid-points-refuse.md

Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

* Link to build.server config

Co-authored-by: Fred K. Schott <fkschott@gmail.com>
Co-authored-by: Sarah Rainsberger <sarah@rainsberger.ca>

1 files changed, 77 insertions, 0 deletions

diff --git a/packages/integrations/node/src/http-server.ts b/packages/integrations/node/src/http-server.ts
new file mode 100644
index 000000000..34192c5f9
--- /dev/null
+++ b/packages/integrations/node/src/http-server.ts
@@ -0,0 +1,77 @@
+import fs from 'fs';
+import http from 'http';
+import https from 'https';
+import { fileURLToPath } from 'url';
+import send from 'send';
+
+interface CreateServerOptions {
+	client: URL;
+	port: number;
+	host: string | undefined;
+}
+
+export function createServer({ client, port, host }: CreateServerOptions, handler: http.RequestListener) {
+	const listener: http.RequestListener = (req, res) => {
+		if(req.url) {
+			const fileURL = new URL('.' + req.url, client);
+
+			const stream = send(req, fileURLToPath(fileURL), {
+				dotfiles: 'deny',
+			});
+
+			let forwardError = false;
+
+			stream.on('error', err => {
+				if(forwardError) {
+					// eslint-disable-next-line no-console
+					console.error(err.toString());
+					res.writeHead(500);
+					res.end('Internal server error');
+					return;
+				}
+				// File not found, forward to the SSR handler
+				handler(req, res);
+			});
+
+			stream.on('file', () => {
+				forwardError = true;
+			});
+			stream.pipe(res);
+		} else {
+			handler(req, res);
+		}
+	};
+
+	let httpServer: http.Server<typeof http.IncomingMessage, typeof http.ServerResponse> |
+		https.Server<typeof http.IncomingMessage, typeof http.ServerResponse>;
+	
+	if(process.env.SERVER_CERT_PATH && process.env.SERVER_KEY_PATH) {
+		httpServer = https.createServer({
+			key: fs.readFileSync(process.env.SERVER_KEY_PATH),
+			cert: fs.readFileSync(process.env.SERVER_CERT_PATH),
+		}, listener);
+	} else {
+		httpServer = http.createServer(listener);
+	}
+	httpServer.listen(port, host);
+
+	// Resolves once the server is closed
+	const closed = new Promise<void>((resolve, reject) => {
+		httpServer.addListener('close', resolve);
+		httpServer.addListener('error', reject);
+	});
+
+	return {
+		host,
+		port,
+		closed() {
+			return closed;
+		},
+		server: httpServer,
+		stop: async () => {
+			await new Promise((resolve, reject) => {
+				httpServer.close((err) => (err ? reject(err) : resolve(undefined)));
+			});
+		},
+	};
+}