soution of task node_compression-app

src/createServer.js

@@ -1,8 +1,121 @@
 'use strict';
 
+const http = require('node:http');
+const { formidable } = require('formidable');
+const fs = require('node:fs');
+const zlib = require('node:zlib');
+
 function createServer() {
-  /* Write your code here */
-  // Return instance of http.Server class
+  const server = new http.Server();
+
+  server.on('request', async (req, res) => {
+    if (req.url === '/') {
+      res.statusCode = 200;
+      res.setHeader('Content-Type', 'text/html');
+
+      res.end(`
+        <form action="/compress" method="POST" enctype="multipart/form-data">
+          <label for="file">Select a file:</label><br />
+          <input type="file" name="file" id="file" style="cursor:pointer" /><br /><br />
+
+          <label for="type">Choose compression:</label><br />
+          <select name="compressionType" id="type" style="cursor:pointer">
+            <option value="gzip">gzip</option>
+            <option value="deflate">deflate</option>
+            <option value="br">br</option>
+          </select><br /><br />
+
+          <button type="submit" style="cursor:pointer">Compress</button>
+        </form>
+      `);
+    } else if (req.url === '/favicon.ico') {
+      res.end('');
+    } else if (req.method === 'POST' && req.url === '/compress') {
+      const form = formidable({});
+
+      form.parse(req, (err, fields, files) => {
+        if (err) {
+          res.statusCode = 400;
+
+          return res.end('Error while parsing the form');
+        }
+
+        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 || !file.filepath) {
+          res.statusCode = 400;
+
+          return res.end('File or compression type missing');
+        }
+
+        let compressor;
+        let extension;
+
+        switch (compressionType) {
+          case 'gzip':
+            compressor = zlib.createGzip();
+            extension = 'gzip';
+            break;
+          case 'deflate':
+            compressor = zlib.createDeflate();
+            extension = 'deflate';
+            break;
+          case 'br':
+            compressor = zlib.createBrotliCompress();
+            extension = 'br';
+            break;
+          default:
+            res.statusCode = 400;
+
+            return res.end('Unsupported compression type');
+        }
+
+        const inputPath = file.filepath;
+        const originalName = file.originalFilename || 'file.txt';
+
+        if (!fs.existsSync(inputPath)) {
+          res.statusCode = 400;
+
+          return res.end('Uploaded file not found');
+        }
+
+        res.statusCode = 200;
+
+        res.setHeader(
+          'Content-Disposition',
+          `attachment; filename=${originalName}.${extension}`,
+        );
+
+        const readStream = fs.createReadStream(inputPath);
+
+        readStream.pipe(compressor).pipe(res);
+
+        res.on('close', () => {
+          readStream.destroy();
+          compressor.destroy();
+        });
+      });
+    } else if (req.url === '/compress' && req.method === 'GET') {
+      res.statusCode = 400;
+      res.end('GET not supported for /compress');
+    } else {
+      res.statusCode = 404;
+      res.end('Not found');
+
+      return null;
+    }
+  });
+
+  server.on('error', (error) => {
+    // eslint-disable-next-line no-console
+    console.log('Error', error);
+  });
+
+  return server;
 }
 
 module.exports = {