add task solution for node_form-data

src/createServer.js

@@ -1,8 +1,76 @@
 'use strict';
 
+const http = require('http');
+const fs = require('fs');
+const path = require('path');
+
 function createServer() {
-  /* Write your code here */
-  // Return instance of http.Server class
+  return http.createServer(async (req, res) => {
+    const url = new URL(req.url, `http://${req.headers.host}`);
+
+    if (req.method === 'POST' && url.pathname === '/add-expense') {
+      const chunks = [];
+
+      for await (const chunk of req) {
+        chunks.push(chunk);
+      }
+
+      const formData = Buffer.concat(chunks).toString();
+
+      let expense;
+
+      try {
+        expense = JSON.parse(formData);
+      } catch (err) {
+        res.statusCode = 400;
+
+        return res.end('Invalid JSON format');
+      }
+
+      const { date, title, amount } = expense;
+
+      if (!date || !title || !amount) {
+        res.statusCode = 400;
+
+        return res.end('Missing required fields');
+      }
+
+      const filePath = path.join(__dirname, '../db/expense.json');
+
+      let expenses = [];
+
+      try {
+        const fileContent = fs.readFileSync(filePath, 'utf8');
+
+        expenses = JSON.parse(fileContent);
+
+        if (!Array.isArray(expenses)) {
+          expenses = [];
+        }
+      } catch (err) {
+        // Dacă fișierul nu există sau e invalid, începem cu un array gol
+        expenses = [];
+      }
+
+      expenses.push(expense);
+
+      try {
+        fs.writeFileSync(filePath, JSON.stringify(expenses, null, 2), 'utf8');
+      } catch (err) {
+        res.statusCode = 500;
+
+        return res.end('Failed to save data');
+      }
+
+      res.statusCode = 200;
+      res.setHeader('Content-Type', 'application/json');
+
+      return res.end(JSON.stringify(expense, null, 2));
+    }
+
+    res.statusCode = 404;
+    res.end('Not Found');
+  });
 }
 
 module.exports = {

tests/formDataServer.test.js

@@ -40,7 +40,7 @@ describe('Form Data Server', () => {
       });
 
       it('should save data for valid expense on "POST /submit-expense" request', async () => {
-        fs.writeFileSync(dataPath, JSON.stringify({}));
+        fs.writeFileSync(dataPath, JSON.stringify([]));
 
         const expense = {
           date: '2024-01-25',
@@ -53,7 +53,7 @@ describe('Form Data Server', () => {
 
         const savedData = JSON.parse(fs.readFileSync(dataPath));
 
-        expect(savedData).toStrictEqual(expense);
+        expect(savedData).toContainEqual(expense);
       });
 
       it('should reject request without all params on "POST /submit-expense" request', async () => {