Solution

src/createServer.js

@@ -1,8 +1,140 @@
+/* eslint-disable no-console */
+/* eslint-disable curly */
 'use strict';
 
+const http = require('node:http');
+const fs = require('node:fs');
+const path = require('node:path');
+const pipeline = require('node:stream').pipeline;
+const zlib = require('node:zlib');
+const formidable = require('formidable');
+const mime = require('mime-types');
+
 function createServer() {
-  /* Write your code here */
-  // Return instance of http.Server class
+  return http.createServer(async (req, res) => {
+    if (req.url === '/' && req.method === 'GET') {
+      const filePath = path.join(__dirname, 'index.html');
+
+      fs.readFile(filePath, (err, data) => {
+        if (err) {
+          res.writeHead(500, { 'Content-Type': 'text/plain' });
+          res.end('Internal Server Error');
+        } else {
+          res.writeHead(200, { 'Content-Type': 'text/html' });
+          res.end(data);
+        }
+      });
+    } else if (req.method !== 'POST' && req.url === '/compress') {
+      res.statusCode = 400;
+      res.end('Bad Request: Invalid request method.');
+    } else if (req.method === 'POST' && req.url === '/compress') {
+      const form = new formidable.IncomingForm();
+
+      form.parse(req, (err, fields, files) => {
+        if (err) {
+          res.statusCode = 500;
+          res.end('Server Error: Failed to parse form data.');
+
+          return;
+        }
+
+        const compressionTypeArray = fields.compressionType;
+        const compressionType = Array.isArray(compressionTypeArray)
+          ? compressionTypeArray[0]
+          : undefined;
+
+        const uploadedFileArray = files.file;
+        const uploadedFile = Array.isArray(uploadedFileArray)
+          ? uploadedFileArray[0]
+          : undefined;
+
+        if (!uploadedFile || !uploadedFile.filepath || !compressionType) {
+          res.statusCode = 400;
+          res.end('Bad Request: File or compression type missing or invalid.');
+
+          return;
+        }
+
+        let compressionStream;
+        let fileExtension;
+
+        switch (compressionType) {
+          case 'gzip':
+            compressionStream = zlib.createGzip();
+            fileExtension = '.gzip';
+            break;
+          case 'deflate':
+            compressionStream = zlib.createDeflate();
+            fileExtension = '.deflate';
+            break;
+          case 'br':
+            compressionStream = zlib.createBrotliCompress();
+            fileExtension = '.br';
+
+            break;
+          default:
+            res.statusCode = 400;
+            res.end('Bad Request: Unsupported compression type.');
+
+            fs.unlink(uploadedFile.filepath, (unlinkErr) => {
+              if (unlinkErr)
+                console.error('Error deleting temp file:', unlinkErr);
+            });
+
+            return;
+        }
+
+        const fileReadStream = fs.createReadStream(uploadedFile.filepath);
+
+        const originalFileName =
+          uploadedFile.originalFilename || 'uploaded_file';
+        const baseName = path.basename(
+          originalFileName,
+          path.extname(originalFileName),
+        );
+
+        const newFileName = `${baseName}${path.extname(originalFileName)}${fileExtension}`;
+        const originalMimeType =
+          uploadedFile.mimetype ||
+          mime.contentType(path.extname(originalFileName)) ||
+          'application/octet-stream';
+
+        res.statusCode = 200;
+        res.setHeader('Content-Type', originalMimeType);
+
+        res.setHeader(
+          'Content-Disposition',
+          `attachment; filename=${newFileName}`,
+        );
+
+        pipeline(fileReadStream, compressionStream, res, (pipelineErr) => {
+          if (pipelineErr) {
+            console.error('Pipeline failed during compression:', pipelineErr);
+
+            if (!res.headersSent) {
+              res.statusCode = 500;
+              res.end('Server Error during file compression.');
+            } else {
+              res.end();
+            }
+          }
+
+          fs.unlink(uploadedFile.filepath, (unlinkErr) => {
+            if (unlinkErr)
+              console.error('Error deleting temporary file:', unlinkErr);
+          });
+
+          res.on('close', () => {
+            fileReadStream.destroy();
+            compressionStream.destroy();
+          });
+        });
+      });
+    } else {
+      res.writeHead(404, { 'Content-Type': 'text/plain' });
+      res.end('Not Found');
+    }
+  });
 }
 
 module.exports = {

src/index.html

@@ -0,0 +1,24 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Compression Application</title>
+  </head>
+  <body>
+    <h1>File Compression</h1>
+    <form action="/compress" method="post" enctype="multipart/form-data">
+      <label for="file">Select a file:</label>
+      <input type="file" id="file" name="file" required /><br /><br />
+
+      <label for="compressionType">Select compression type:</label>
+      <select id="compressionType" name="compressionType" required>
+        <option value="gzip">gzip</option>
+        <option value="deflate">deflate</option>
+        <option value="br">brotli</option></select
+      ><br /><br />
+
+      <button type="submit">Compress</button>
+    </form>
+  </body>
+</html>