folder names

7-bank-project/api/server.js

@@ -0,0 +1,197 @@
+const express = require('express');
+const bodyParser = require('body-parser');
+const cors = require('cors')
+const crypto = require('crypto');
+const pkg = require('./package.json');
+
+// App constants
+const port = process.env.PORT || 5000;
+const apiPrefix = '/api';
+
+// Store data in-memory, not suited for production use!
+const db = {
+  test: {
+    user: 'test',
+    currency: '$',
+    description: `Test account`,
+    balance: 75,
+    transactions: [
+      { id: '1', date: '2020-10-01', object: 'Pocket money', amount: 50 },
+      { id: '2', date: '2020-10-03', object: 'Book', amount: -10 },
+      { id: '3', date: '2020-10-04', object: 'Sandwich', amount: -5 }
+    ],
+  }
+};
+
+// Create the Express app & setup middlewares
+const app = express();
+app.use(bodyParser.urlencoded({ extended: true }));
+app.use(bodyParser.json());
+app.use(cors({ origin: /http:\/\/localhost/ }));
+app.options('*', cors());
+
+// ***************************************************************************
+
+// Configure routes
+const router = express.Router();
+
+// Get server infos
+router.get('/', (req, res) => {
+  return res.send(`${pkg.description} v${pkg.version}`);
+});
+
+// ----------------------------------------------
+
+// Create an account
+router.post('/accounts', (req, res) => {
+  // Check mandatory request parameters
+  if (!req.body.user || !req.body.currency) {
+    return res.status(400).json({ error: 'Missing parameters' });
+  }
+
+  // Check if account already exists
+  if (db[req.body.user]) {
+    return res.status(409).json({ error: 'User already exists' });
+  }
+
+  // Convert balance to number if needed
+  let balance = req.body.balance;
+  if (balance && typeof balance !== 'number') {
+    balance = parseFloat(balance);
+    if (isNaN(balance)) {
+      return res.status(400).json({ error: 'Balance must be a number' });  
+    }
+  }
+
+  // Create account
+  const account = {
+    user: req.body.user,
+    currency: req.body.currency,
+    description: req.body.description || `${req.body.user}'s budget`,
+    balance: balance || 0,
+    transactions: [],
+  };
+  db[req.body.user] = account;
+
+  return res.status(201).json(account);
+});
+
+// ----------------------------------------------
+
+// Get all data for the specified account
+router.get('/accounts/:user', (req, res) => {
+  const account = db[req.params.user];
+
+  // Check if account exists
+  if (!account) {
+    return res.status(404).json({ error: 'User does not exist' });
+  }
+
+  return res.json(account);
+});
+
+// ----------------------------------------------
+
+// Remove specified account
+router.delete('/accounts/:user', (req, res) => {
+  const account = db[req.params.user];
+
+  // Check if account exists
+  if (!account) {
+    return res.status(404).json({ error: 'User does not exist' });
+  }
+
+  // Removed account
+  delete db[req.params.user];
+
+  res.sendStatus(204);
+});
+
+// ----------------------------------------------
+
+// Add a transaction to a specific account
+router.post('/accounts/:user/transactions', (req, res) => {
+  const account = db[req.params.user];
+
+  // Check if account exists
+  if (!account) {
+    return res.status(404).json({ error: 'User does not exist' });
+  }
+
+  // Check mandatory requests parameters
+  if (!req.body.date || !req.body.object || !req.body.amount) {
+    return res.status(400).json({ error: 'Missing parameters' });
+  }
+
+  // Convert amount to number if needed
+  let amount = req.body.amount;
+  if (amount && typeof amount !== 'number') {
+    amount = parseFloat(amount);
+  }
+
+  // Check that amount is a valid number
+  if (amount && isNaN(amount)) {
+    return res.status(400).json({ error: 'Amount must be a number' });
+  }
+
+  // Generates an ID for the transaction
+  const id = crypto
+    .createHash('md5')
+    .update(req.body.date + req.body.object + req.body.amount)
+    .digest('hex');
+
+  // Check that transaction does not already exist
+  if (account.transactions.some((transaction) => transaction.id === id)) {
+    return res.status(409).json({ error: 'Transaction already exists' });
+  }
+
+  // Add transaction
+  const transaction = {
+    id,
+    date: req.body.date,
+    object: req.body.object,
+    amount,
+  };
+  account.transactions.push(transaction);
+
+  // Update balance
+  account.balance += transaction.amount;
+
+  return res.status(201).json(transaction);
+});
+
+// ----------------------------------------------
+
+// Remove specified transaction from account
+router.delete('/accounts/:user/transactions/:id', (req, res) => {
+  const account = db[req.params.user];
+
+  // Check if account exists
+  if (!account) {
+    return res.status(404).json({ error: 'User does not exist' });
+  }
+
+  const transactionIndex = account.transactions.findIndex(
+    (transaction) => transaction.id === req.params.id
+  );
+
+  // Check if transaction exists
+  if (transactionIndex === -1) {
+    return res.status(404).json({ error: 'Transaction does not exist' });
+  }
+
+  // Remove transaction
+  account.transactions.splice(transactionIndex, 1);
+
+  res.sendStatus(204);
+});
+
+// ***************************************************************************
+
+// Add 'api` prefix to all routes
+app.use(apiPrefix, router);
+
+// Start the server
+app.listen(port, () => {
+  console.log(`Server listening on port ${port}`);
+});