task solution

src/createServer.js

@@ -1,8 +1,77 @@
 'use strict';
 
+const http = require('http');
+const fs = require('fs');
+const path = require('path');
+
 function createServer() {
-  /* Write your code here */
-  // Return instance of http.Server class
+  const server = http.createServer((req, res) => {
+    const protectedUrl = new URL(req.url, `http://${req.headers.host}`);
+    const url = protectedUrl.pathname;
+
+    if (url === '/file' || url === '/file/') {
+      const indexFilePath = path.join(__dirname, '../public/index.html');
+
+      fs.readFile(indexFilePath, (err, data) => {
+        if (err) {
+          res.statusCode = 404;
+          res.setHeader('Content-Type', 'text/plain');
+          res.end('Not Found');
+
+          return;
+        }
+        res.statusCode = 200;
+        res.setHeader('Content-Type', 'text/plain');
+        res.end(data);
+      });
+
+      return;
+    }
+
+    if (!url.startsWith('/file/')) {
+      res.statusCode = 400;
+      res.setHeader('Content-Type', 'text/plain');
+      res.end('Bad Request');
+
+      return;
+    }
+
+    const relativePath = url.slice(6);
+
+    if (relativePath.includes('..')) {
+      res.statusCode = 400;
+      res.setHeader('Content-Type', 'text/plain');
+      res.end('Bad Request');
+
+      return;
+    }
+
+    if (relativePath.includes('//')) {
+      res.statusCode = 404;
+      res.setHeader('Content-Type', 'text/plain');
+      res.end('Not Found');
+
+      return;
+    }
+
+    const filePath = path.join(__dirname, '../public', relativePath);
+
+    fs.readFile(filePath, (err, data) => {
+      if (err) {
+        res.statusCode = 404;
+        res.setHeader('Content-Type', 'text/plain');
+        res.end('Not Found');
+
+        return;
+      }
+
+      res.statusCode = 200;
+      res.setHeader('Content-Type', 'text/plain');
+      res.end(data);
+    });
+  });
+
+  return server;
 }
 
 module.exports = {