Add HTTPS and HTTP/2 support for adapter-node

.changeset/mighty-wasps-perform.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/adapter-node': minor
+---
+
+feat: add opt-in HTTPS and HTTP/2 support

documentation/docs/25-build-and-deploy/40-adapter-node.md

@@ -110,6 +110,18 @@ We instead read from the _right_, accounting for the number of trusted proxies.
 
 The maximum request body size to accept in bytes including while streaming. Defaults to 512kb. You can disable this option with a value of 0 and implement a custom check in [`handle`](hooks#server-hooks-handle) if you need something more advanced.
 
+### `CERT_PATH`, `CERT_KEY_PATH`, and `HTTPS_PORT`:
+By default, the server only listens for plain HTTP requests. To enable an additional HTTPS endpoint, you must provide the `CERT_PATH` and `CERT_KEY_PATH` environment variables pointing to a file containing a valid certificate and a file containing its associated private key respectively, both in the PEM format.
+The files are read once on startup, so if the contents of the files change, the app will need to be restarted.
+
+The default port that will be used for the HTTPS endpoint is 3001. You can customize this via the `HTTPS_PORT` environment variable.
+
+### `NO_HTTP2`:
+By default, the HTTPS endpoint will support HTTP/2 as well as HTTP/1.1. If, for some reason, supporting HTTP/2 isn't desirable, you can disable it by setting the `NO_HTTP2` environment variable to a non-empty value (e.g. `1`).
+
+### `ONLY_HTTPS`:
+If you only need an HTTPS endpoint and want to opt out of the default plain HTTP one, you can do so by setting the `ONLY_HTTPS` environment variable to a non-empty value (e.g. `1`).
+
 ## Options
 
 The adapter can be configured with various options:

packages/adapter-node/src/env.js

@@ -9,7 +9,12 @@ const expected = new Set([
 	'ADDRESS_HEADER',
 	'PROTOCOL_HEADER',
 	'HOST_HEADER',
-	'BODY_SIZE_LIMIT'
+	'BODY_SIZE_LIMIT',
+	'CERT_PATH',
+	'CERT_KEY_PATH',
+	'HTTPS_PORT',
+	'ONLY_HTTPS',
+	'NO_HTTP2'
 ]);
 
 if (ENV_PREFIX) {

packages/adapter-node/src/index.js

@@ -1,15 +1,38 @@
 import { handler } from 'HANDLER';
 import { env } from 'ENV';
 import polka from 'polka';
+import http from 'node:http';
+import https from 'node:https';
+import http2 from 'node:http2';
+import fs from 'node:fs';
 
 export const path = env('SOCKET_PATH', false);
 export const host = env('HOST', '0.0.0.0');
 export const port = env('PORT', !path && '3000');
+export const cert_path = env('CERT_PATH', false);
+export const cert_key_path = env('CERT_KEY_PATH', false);
+export const https_port = env('HTTPS_PORT', !path && '3001');
+export const only_https = env('ONLY_HTTPS', false);
+export const no_http2 = env('NO_HTTP2', false);
 
-const server = polka().use(handler);
+const app = polka().use(handler);
 
-server.listen({ path, host, port }, () => {
-	console.log(`Listening on ${path ? path : host + ':' + port}`);
-});
+if (!only_https) {
+	http.createServer(app.handler).listen({ path, host, port }, () => {
+		console.log(`Listening on http://${path ? path : host + ':' + port}`);
+	});
+}
 
-export { server };
+if (cert_path && cert_key_path) {
+	const cert = fs.readFileSync(cert_path);
+	const key = fs.readFileSync(cert_key_path);
+	const https_server = no_http2
+		? https.createServer({ cert, key }, app.handler)
+		: http2.createSecureServer({ allowHTTP1: true, cert, key }, app.handler);
+
+	https_server.listen({ path, host, https_port }, () => {
+		console.log(`Listening on https://${path ? path : host + ':' + https_port}`);
+	});
+}
+
+export { app as server };