add task solution for node_compression-app

src/createServer.js

@@ -1,8 +1,116 @@
 'use strict';
 
+const http = require('http');
+const fs = require('fs');
+const path = require('path');
+const zlib = require('zlib');
+const formidable = require('formidable');
+
 function createServer() {
   /* Write your code here */
   // Return instance of http.Server class
+  const server = new http.Server();
+
+  server.on('request', (req, res) => {
+    if (req.method === 'POST' && req.url === '/compress') {
+      const form = new formidable.IncomingForm({ multiples: false });
+
+      form.parse(req, (err, fields, files) => {
+        if (err) {
+          res.statusCode = 400;
+
+          return res.end('Invalid form data');
+        }
+
+        const compressionType = Array.isArray(fields.compressionType)
+          ? fields.compressionType[0]
+          : fields.compressionType;
+
+        const uploadedFile = Array.isArray(files.file)
+          ? files.file[0]
+          : files.file;
+
+        if (!uploadedFile || !uploadedFile.filepath) {
+          res.statusCode = 400;
+
+          return res.end('File is required');
+        }
+
+        if (!compressionType) {
+          res.statusCode = 400;
+
+          return res.end('Compression type is required');
+        }
+
+        let compressor;
+
+        switch (compressionType) {
+          case 'gzip':
+            compressor = zlib.createGzip();
+            break;
+          case 'deflate':
+            compressor = zlib.createDeflate();
+            break;
+          case 'br':
+            compressor = zlib.createBrotliCompress();
+            break;
+          default:
+            res.statusCode = 400;
+
+            return res.end('Unsupported compression type');
+        }
+
+        const fileStream = fs.createReadStream(uploadedFile.filepath);
+        const originalFileName = path.basename(
+          uploadedFile.originalFilename || 'file',
+        );
+
+        res.statusCode = 200;
+        res.setHeader('Content-Type', 'application/octet-stream');
+
+        res.setHeader(
+          'Content-Disposition',
+          `attachment; filename=${originalFileName}.${compressionType}`,
+        );
+
+        fileStream.pipe(compressor).pipe(res);
+
+        res.on('close', () => {
+          fileStream.destroy();
+          compressor.destroy();
+        });
+      });
+
+      return;
+    }
+
+    if (req.method === 'GET' && req.url === '/compress') {
+      res.statusCode = 400;
+
+      return res.end('Bad Request');
+    }
+
+    if (req.method === 'GET' && req.url === '/') {
+      res.statusCode = 200;
+      res.setHeader('Content-type', 'text/html');
+
+      res.end(`<form method="POST" action="/compress" enctype="multipart/form-data">
+        <input name="file" type="file">
+        <select name="compressionType">
+          <option value="gzip">gzip</option>
+          <option value="deflate">deflate</option>
+          <option value="br">br</option>
+        </select>
+        <button type="submit">Submit</button>
+      </form>`);
+
+      return;
+    }
+    res.statusCode = 404;
+    res.end('Not Found');
+  });
+
+  return server;
 }
 
 module.exports = {