add task solution

src/createServer.js

@@ -1,9 +1,85 @@
+/* eslint-disable no-console */
 'use strict';
 
+const http = require('node:http');
+const fs = require('fs');
+const { createTransformer } = require('./services/createTransformer');
+const formidable = require('formidable');
+const { pipeline } = require('node:stream');
+
+const OK = 200;
+const BAD_REQUEST = 400;
+const NOT_FOUND = 404;
+const availableCompressionTypes = ['gzip', 'deflate', 'br'];
+
 function createServer() {
-  /* Write your code here */
-  // Return instance of http.Server class
-}
+  return http.createServer(async(req, res) => {
+    switch (req.url) {
+      case '/':
+      case '/index.html':
+        res.writeHead(OK, { 'Content-Type': 'text/html' });
+
+        fs.createReadStream('public/index.html')
+          .pipe(res);
+
+        break;
+
+      case '/compress':
+        if (req.method !== 'POST') {
+          res.writeHead(BAD_REQUEST, { 'Content-Type': 'text/plain' });
+          res.end('Wrong form method');
+
+          return;
+        }
+
+        const form = new formidable.IncomingForm();
+
+        form.parse(
+          req,
+          (err, { compressionType: compressionTypesArr }, { file: files }) => {
+            if (err || !compressionTypesArr || !files) {
+              res.writeHead(BAD_REQUEST, { 'Content-Type': 'text/plain' });
+              res.end('Both file and compression type are required');
+
+              return;
+            }
+
+            const [compressionType] = compressionTypesArr;
+            const [file] = files;
+
+            if (!availableCompressionTypes.includes(compressionType)) {
+              res.writeHead(BAD_REQUEST, { 'Content-Type': 'text/plain' });
+              res.end('Unsupported compression type');
+
+              return;
+            }
+
+            const transformer = createTransformer(compressionType);
+
+            res.setHeader(
+              'Content-Disposition',
+              `attachment; filename=${file.originalFilename}.${compressionType}`
+            );
+
+            pipeline(
+              fs.createReadStream(file.filepath),
+              transformer,
+              res,
+              (error) => {
+                if (error) {
+                  console.error('error -', error);
+                }
+              });
+          });
+
+        break;
+
+      default:
+        res.writeHead(NOT_FOUND, { 'Content-Type': 'text/plain' });
+        res.end('Not found');
+    }
+  });
+};
 
 module.exports = {
   createServer,

src/services/createTransformer.js

@@ -0,0 +1,18 @@
+'use strict';
+
+const zlib = require('zlib');
+
+const createTransformer = (transformer) => {
+  switch (transformer) {
+    case 'gzip':
+      return zlib.createGzip();
+    case 'br':
+      return zlib.createBrotliCompress();
+    case 'deflate':
+      return zlib.createDeflate();
+  }
+};
+
+module.exports = {
+  createTransformer,
+};