From ce82dbf107f8eee8746487dd9ea3c8d65ce36f79 Mon Sep 17 00:00:00 2001
From: Andrii IEvych <yevych27@gmail.com>
Date: Thu, 29 May 2025 11:50:52 +0300
Subject: [PATCH] add task solution

---
 src/createServer.js | 135 +++++++++++++++++++++++++++++++++++++++++++-
 src/index.html      |  28 +++++++++
 2 files changed, 161 insertions(+), 2 deletions(-)
 create mode 100644 src/index.html

diff --git a/src/createServer.js b/src/createServer.js
index 1cf1dda..ed716e8 100644
--- a/src/createServer.js
+++ b/src/createServer.js
@@ -1,8 +1,139 @@
 'use strict';
 
+const http = require('http');
+const zlib = require('zlib');
+const path = require('path');
+const fs = require('fs');
+const { pipeline } = require('stream');
+const formidable = require('formidable');
+
+/**
+ * Creates an HTTP server that handles file compression requests.
+ * @returns {http.Server} The configured HTTP server.
+ */
 function createServer() {
-  /* Write your code here */
-  // Return instance of http.Server class
+  const server = http.createServer((req, res) => {
+    // Обробляємо запит на головну сторінку
+    if (req.method === 'GET' && req.url === '/') {
+      const indexPath = path.join(__dirname, 'index.html');
+
+      fs.readFile(indexPath, (err, data) => {
+        if (err) {
+          res.writeHead(404, 'Not Found', { 'Content-Type': 'text/plain' });
+          res.end('404 Not Found: index.html not found');
+
+          return;
+        }
+        res.writeHead(200, 'OK', { 'Content-Type': 'text/html' });
+        res.end(data);
+      });
+
+      return;
+    }
+
+    // Обробляємо неіснуючі маршрути (404)
+    if (req.url !== '/compress') {
+      res.writeHead(404, 'Not Found', { 'Content-Type': 'text/plain' });
+      res.end('404 Not Found');
+
+      return;
+    }
+
+    // Обробляємо GET-запити до /compress (400)
+    if (req.method === 'GET') {
+      res.writeHead(400, 'Bad Request', { 'Content-Type': 'text/plain' });
+      res.end('400 Bad Request: Use POST method to /compress');
+
+      return;
+    }
+
+    // Обробляємо POST-запит до /compress
+    const form = new formidable.IncomingForm({
+      multiples: false,
+      keepExtensions: true,
+    });
+
+    form.parse(req, (err, fields, files) => {
+      if (err) {
+        res.writeHead(400, 'Bad Request', { 'Content-Type': 'text/plain' });
+        res.end('400 Bad Request: Error parsing form');
+
+        return;
+      }
+
+      // Перевіряємо валідність форми
+      const compressionType = Array.isArray(fields.compressionType)
+        ? fields.compressionType[0]
+        : fields.compressionType;
+      const file = Array.isArray(files.file) ? files.file[0] : files.file;
+
+      if (!compressionType || !file) {
+        res.writeHead(400, 'Bad Request', { 'Content-Type': 'text/plain' });
+
+        res.end(
+          '400 Bad Request: Missing required fields (file or compressionType)',
+        );
+
+        return;
+      }
+
+      const supportedTypes = ['gzip', 'deflate', 'br'];
+
+      if (!supportedTypes.includes(compressionType)) {
+        res.writeHead(400, 'Bad Request', { 'Content-Type': 'text/plain' });
+        res.end('400 Bad Request: Unsupported compression type');
+
+        return;
+      }
+
+      const originalName = path.basename(
+        file.originalFilename || 'unknown.txt',
+      );
+      const extension =
+        compressionType === 'gzip'
+          ? '.gzip'
+          : compressionType === 'deflate'
+            ? '.deflate'
+            : '.br';
+      const compressedFileName = `${originalName}${extension}`;
+
+      // Визначаємо метод стиснення
+      let compressor;
+
+      if (compressionType === 'gzip') {
+        compressor = zlib.createGzip();
+      } else if (compressionType === 'deflate') {
+        compressor = zlib.createDeflate();
+      } else {
+        compressor = zlib.createBrotliCompress();
+      }
+
+      // Налаштовуємо заголовки для скачування файлу без лапок
+      res.writeHead(200, 'OK', {
+        'Content-Type': 'application/octet-stream',
+        'Content-Disposition': `attachment; filename=${compressedFileName}`, // Видалено лапки
+      });
+
+      // Створюємо потоки для читання, стиснення і запису у відповідь
+      const readStream = fs.createReadStream(file.filepath);
+
+      // eslint-disable-next-line no-shadow
+      pipeline(readStream, compressor, res, (err) => {
+        if (err) {
+          if (!res.writableEnded) {
+            res.writeHead(500, 'Internal Server Error', {
+              'Content-Type': 'text/plain',
+            });
+            res.end('500 Internal Server Error');
+          }
+        } else if (!res.writableEnded) {
+          res.end(); // Гарантуємо закриття відповіді
+        }
+      });
+    });
+  });
+
+  return server;
 }
 
 module.exports = {
diff --git a/src/index.html b/src/index.html
new file mode 100644
index 0000000..cad72e1
--- /dev/null
+++ b/src/index.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>File Compression App</title>
+</head>
+<body>
+  <h1>File Compression App</h1>
+  <form action="/compress" method="POST" enctype="multipart/form-data">
+    <div>
+      <label for="file">Select a file to compress:</label>
+      <input type="file" id="file" name="file" required>
+    </div>
+    <div>
+      <label for="compressionType">Choose compression type:</label>
+      <select id="compressionType" name="compressionType" required>
+        <option value="gzip">Gzip (.gz)</option>
+        <option value="deflate">Deflate (.dfl)</option>
+        <option value="br">Brotli (.br)</option>
+      </select>
+    </div>
+    <div>
+      <button type="submit">Compress File</button>
+    </div>
+  </form>
+</body>
+</html>