Solution

src/createServer.js

@@ -1,8 +1,123 @@
 'use strict';
+/* eslint-disable no-console */
+
+const http = require('node:http');
+const fs = require('node:fs');
+const path = require('node:path');
+
+const mimeTypes = {
+  '.html': 'text/html',
+  '.htm': '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',
+  '.ico': 'image/x-icon',
+  '.txt': 'text/plain',
+};
+
+// ; charset=utf-8
+
+function getContentType(filePath) {
+  const ext = path.extname(filePath).toLowerCase();
+
+  return mimeTypes[ext] || 'application/octet-stream';
+}
+
+function readFile(pathToFile, res, contentType = 'text/plain') {
+  fs.readFile(pathToFile, (error, data) => {
+    if (error) {
+      if (error.code === 'ENOENT') {
+        res.statusCode = 404;
+        res.setHeader('Content-Type', 'text/plain');
+        res.end('Not found');
+      } else {
+        res.statusCode = 500;
+        res.setHeader('Content-Type', 'text/plain');
+        res.end('Server error');
+      }
+
+      return;
+    }
+    res.statusCode = 200;
+    res.setHeader('Content-Type', contentType);
+    res.end(data);
+  });
+}
 
 function createServer() {
-  /* Write your code here */
-  // Return instance of http.Server class
+  const server = http.createServer((req, res) => {
+    const { pathname } = new URL(req.url, 'http://localhost:5701');
+
+    if (pathname === '/favicon.ico') {
+      res.statusCode = 204;
+      res.setHeader('Content-Type', 'text/plain');
+      res.end();
+
+      return;
+    }
+
+    const decodedPath = decodeURIComponent(pathname);
+
+    if (decodedPath.includes('..')) {
+      res.statusCode = 400;
+      res.setHeader('Content-Type', 'text/plain');
+      res.end('Not Found');
+
+      return;
+    }
+
+    if (pathname.includes('//')) {
+      res.statusCode = 404;
+      res.setHeader('Content-Type', 'text/plain');
+      res.end('Bad Request');
+
+      return;
+    }
+
+    if (pathname === '/file' || pathname === '/file/') {
+      const pathTopublicDir = path.normalize(
+        path.join(__dirname, '..', 'public') + path.sep,
+      );
+      const newPath = path.join(pathTopublicDir, 'index.html');
+
+      readFile(newPath, res, 'text/plain');
+
+      return;
+    }
+
+    if (!pathname.startsWith('/file')) {
+      res.statusCode = 200;
+      res.setHeader('Content-Type', 'text/plain');
+      res.end('To upload a file, use the path /file/<file_name>');
+
+      return;
+    }
+
+    const requested = pathname.replace(/^\/file/, '').replace(/^\/+/, '');
+
+    const publicDir = path.normalize(
+      path.join(__dirname, '..', 'public') + path.sep,
+    );
+
+    const fullPath = path.normalize(path.join(publicDir, requested));
+
+    if (!fullPath.startsWith(publicDir)) {
+      res.statusCode = 400;
+      res.setHeader('Content-Type', 'text/plain');
+      res.end('Not Found');
+
+      return;
+    }
+
+    readFile(fullPath, res, getContentType(fullPath));
+  });
+
+  return server;
 }
 
 module.exports = {