Solution

src/createServer.js

@@ -1,10 +1,111 @@
+/* eslint-disable max-len */
 'use strict';
 
+const http = require('node:http');
+const fsp = require('node:fs/promises');
+const path = require('node:path');
+
 function createServer() {
-  /* Write your code here */
-  // Return instance of http.Server class
+  const getContentType = (ext) => {
+    const types = {
+      '.html': 'text/html',
+      '.css': 'text/css',
+      '.js': 'application/javascript',
+      '.json': 'application/json',
+      '.png': 'image/png',
+      '.jpg': 'image/jpeg',
+      '.jpeg': 'image/jpeg',
+      '.gif': 'image/gif',
+      '.svg': 'image/svg+xml',
+      '.txt': 'text/plain',
+    };
+
+    return types[ext] || 'text/plain';
+  };
+
+  return http.createServer(async (req, res) => {
+    if (req.url.includes('//')) {
+      res.statusCode = 404;
+      res.setHeader('Content-Type', 'text/plain');
+      res.end('Not Found');
+
+      return;
+    }
+
+    const url = new URL(req.url, `http://${req.headers.host}`);
+    const { pathname } = url;
+
+    const publicDir = path.resolve('public');
+
+    if (!pathname.startsWith('/file')) {
+      res.statusCode = 400;
+      res.setHeader('Content-Type', 'text/plain');
+
+      res.end(
+        'To load files, use paths starting with /file/, e.g., /file/index.html',
+      );
+
+      return;
+    }
+
+    if (pathname === '/file') {
+      const filePath = path.resolve(publicDir, 'index.html');
+
+      if (!filePath.startsWith(publicDir + path.sep)) {
+        res.statusCode = 400;
+        res.setHeader('Content-Type', 'text/html');
+        res.end('Bad Request');
+
+        return;
+      }
+
+      try {
+        const data = await fsp.readFile(filePath);
+
+        res.statusCode = 200;
+        res.setHeader('Content-Type', 'text/plain');
+        res.end(data);
+      } catch (error) {
+        res.statusCode = 404;
+        res.setHeader('Content-Type', 'text/plain');
+        res.end('Not Found');
+      }
+
+      return;
+    }
+
+    if (pathname.startsWith('/file/')) {
+      let requestedPath = pathname.replace('/file/', '');
+
+      if (!requestedPath || requestedPath === '/') {
+        requestedPath = 'index.html';
+      }
+
+      const filePath = path.resolve(publicDir, requestedPath);
+
+      if (!filePath.startsWith(publicDir + path.sep)) {
+        res.statusCode = 400;
+        res.setHeader('Content-Type', 'text/plain');
+        res.end('Bad Request');
+
+        return;
+      }
+
+      try {
+        const data = await fsp.readFile(filePath);
+        const ext = path.extname(filePath);
+        const contentType = getContentType(ext);
+
+        res.statusCode = 200;
+        res.setHeader('Content-Type', contentType);
+        res.end(data);
+      } catch (error) {
+        res.statusCode = 404;
+        res.setHeader('Content-Type', 'text/plain');
+        res.end('Not Found');
+      }
+    }
+  });
 }
 
-module.exports = {
-  createServer,
-};
+module.exports = { createServer };