solution

package.json

@@ -17,7 +17,7 @@
   "license": "GPL-3.0",
   "devDependencies": {
     "@mate-academy/eslint-config": "latest",
-    "@mate-academy/scripts": "^1.8.6",
+    "@mate-academy/scripts": "^2.1.2",
     "axios": "^1.7.2",
     "eslint": "^8.57.0",
     "eslint-plugin-jest": "^28.6.0",
@@ -27,5 +27,8 @@
   },
   "mateAcademy": {
     "projectType": "javascript"
+  },
+  "dependencies": {
+    "mime-types": "^3.0.1"
   }
 }

src/createServer.js

@@ -1,8 +1,129 @@
 'use strict';
 
+const http = require('http');
+const url = require('url');
+const path = require('path');
+const fs = require('fs');
+const mime = require('mime-types');
+
 function createServer() {
-  /* Write your code here */
-  // Return instance of http.Server class
+  const server = http.createServer(async (req, res) => {
+    function checkValidation(obj) {
+      if (typeof obj.date !== 'string' || !obj.date.trim()) {
+        throw new Error(`Field of date not correct: ${obj.date}`);
+      }
+
+      if (typeof obj.title !== 'string' || !obj.title.trim()) {
+        throw new Error(`Field of title not correct: ${obj.title}`);
+      }
+
+      const number = +obj.amount;
+
+      if (!Number.isFinite(number) || number <= 0) {
+        throw new Error(`Field of amount not correct: ${number}`);
+      }
+
+      const date = new Date(obj.date);
+
+      if (isNaN(date.getTime())) {
+        throw new Error(`Field of date not correct: ${obj.date}`);
+      }
+
+      return true;
+    }
+
+    if (req.method === 'POST') {
+      let rawBody = '';
+
+      const contentType = req.headers['content-type'];
+
+      req.on('data', (chunk) => {
+        rawBody = rawBody + chunk;
+      });
+
+      req.on('end', () => {
+        let data = null;
+
+        const normalizedContentType = contentType.includes(';')
+          ? contentType.split(';')[0]
+          : contentType;
+
+        if (normalizedContentType === 'application/json') {
+          data = JSON.parse(rawBody);
+        }
+
+        if (normalizedContentType === 'application/x-www-form-urlencoded') {
+          data = Object.fromEntries(new URLSearchParams(rawBody));
+        }
+
+        if (data === null) {
+          res.writeHead(400, { 'Content-Type': 'text/plain' });
+          res.end(`Unsupported Content-Type: ${normalizedContentType}`);
+
+          return;
+        }
+
+        try {
+          checkValidation(data);
+        } catch (err) {
+          res.writeHead(400, { 'Content-Type': 'text/html' });
+
+          res.end(
+            `<pre>${err.message}</pre> <pre>${JSON.stringify(
+              {
+                invalid: data,
+              },
+              null,
+              2,
+            )}</pre>`,
+          );
+
+          return;
+        }
+
+        const folder = path.join(__dirname, '..', 'db');
+        const filePath = path.join(folder, 'expense.json');
+
+        if (!fs.existsSync(folder)) {
+          fs.mkdirSync(folder, { recursive: true });
+        }
+
+        fs.writeFileSync(filePath, JSON.stringify(data, null, 2));
+
+        res.writeHead(200, { 'Content-Type': 'text/html' });
+
+        res.end(`<pre>${JSON.stringify(data, null, 2)}</pre>`);
+      });
+    }
+
+    if (req.method === 'GET') {
+      const base = req.headers.host
+        ? `http://${req.headers.host}`
+        : 'http://localhost:5701';
+
+      const normalizedUrl = new url.URL(req.url || '', base);
+      const origin =
+        path.basename(normalizedUrl.pathname.slice(1)) || 'index.html';
+
+      const mimeType = mime.lookup(origin) || 'text/plain';
+
+      const originPathName = path.join(__dirname, origin);
+
+      const fsStream = fs.createReadStream(originPathName);
+
+      fsStream.on('error', (err) => {
+        res.writeHead(404, { 'Content-Type': mimeType });
+        res.end(`Error reading file: ${String(err)}`);
+      });
+
+      fsStream.on('open', () => {
+        res.writeHead(200, { 'Content-Type': 'text/html' });
+        fsStream.pipe(res);
+      });
+    }
+  });
+
+  return server;
 }
 
 module.exports = {

src/index.html

@@ -0,0 +1,37 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Form data</title>
+  </head>
+  <body>
+    <form
+      style="
+        display: flex;
+        margin-left: 20px;
+        flex-direction: column;
+        gap: 10px;
+        width: 200px;
+      "
+      action="/order"
+      method="POST"
+    >
+      <label for="date">Date:</label>
+      <input type="date" id="date" name="date" required />
+      <label for="title">Title:</label>
+      <input type="text" name="title" id="title" required />
+      <label for="amount">Amount:</label>
+      <input
+        type="number"
+        name="amount"
+        id="amount"
+        min="1"
+        step="0.01"
+        required
+      />
+
+      <button type="submit">submit</button>
+    </form>
+  </body>
+</html>