http: add http.createStaticServer

lib/http/server.js

@@ -0,0 +1,108 @@
+'use strict';
+
+const {
+  Promise,
+  RegExpPrototypeExec,
+  StringPrototypeEndsWith,
+  StringPrototypeIndexOf,
+  StringPrototypeLastIndexOf,
+  StringPrototypeReplace,
+  StringPrototypeSlice,
+  StringPrototypeStartsWith,
+  StringPrototypeToLocaleLowerCase,
+} = primordials;
+
+const { cwd } = process;
+const console = require('internal/console/global');
+const { createReadStream } = require('fs');
+const { createServer } = require('http');
+const { URL, pathToFileURL } = require('internal/url');
+const { sep } = require('path');
+const { setImmediate } = require('timers');
+
+if (module.isPreloading) {
+  process.env.NODE_REPL_EXTERNAL_MODULE = 'node:http/server';
+  setImmediate(startServer);
+}
+
+function startServer() {
+  const CWD_URL = pathToFileURL(cwd() + sep);
+
+  const server = createServer(async (req, res) => {
+    const url = new URL(
+      req.url === '/' || StringPrototypeStartsWith(req.url, '/?') ?
+        './index.html' :
+        StringPrototypeReplace(new URL(req.url, 'root://').toString(), 'root://', '.'),
+      CWD_URL
+    );
+
+    const mime = {
+      '__proto__': null,
+      '.html': 'text/html; charset=UTF-8',
+      '.css': 'text/css; charset=UTF-8',
+      '.avif': 'image/avif',
+      '.svg': 'image/svg+xml',
+      '.jpg': 'image/jpeg',
+      '.jpeg': 'image/jpeg',
+      '.png': 'image/png',
+      '.webp': 'image/webp',
+      '.mp4': 'image/gif',
+      '.woff2': 'font/woff2',
+    };
+    const ext = StringPrototypeToLocaleLowerCase(
+      StringPrototypeSlice(url.pathname, StringPrototypeLastIndexOf(url.pathname, '.'))
+    );
+    if (ext in mime) res.setHeader('Content-Type', mime[ext]);
+
+    try {
+      try {
+        const stream = createReadStream(url, { emitClose: false });
+        await new Promise((resolve, reject) => {
+          stream.on('error', reject);
+          stream.on('close', resolve);
+          stream.pipe(res);
+        });
+      } catch (err) {
+        if (err?.code === 'EISDIR') {
+          if (StringPrototypeEndsWith(req.url, '/') || RegExpPrototypeExec(/^[^?]+\/\?/, req.url) !== null) {
+            const stream = createReadStream(new URL('./index.html', url), {
+              emitClose: false,
+            });
+            await new Promise((resolve, reject) => {
+              stream.on('error', reject);
+              stream.on('close', resolve);
+              stream.pipe(res);
+            });
+          } else {
+            res.statusCode = 307;
+            const index = StringPrototypeIndexOf(req.url, '?');
+            res.setHeader(
+              'Location',
+              index === -1 ?
+                `${req.url}/` :
+                `${StringPrototypeSlice(req.url, 0, index)}/${StringPrototypeSlice(req.url, index)}`
+            );
+            res.end('Temporary Redirect');
+          }
+        } else {
+          throw err;
+        }
+      }
+    } catch (err) {
+      if (err?.code === 'ENOENT') {
+        console.log('404', req.url);
+        res.statusCode = 404;
+        res.end('Not Found');
+      } else {
+        console.error(`Error while loading ${req.url}:`);
+        console.error(err);
+        res.statusCode = 500;
+        res.end('Internal Error');
+      }
+    }
+  }).listen(() => {
+    console.log(`Server started on http://localhost:${server.address().port}`);
+  });
+}
+
+module.exports = startServer;