implemented a simple backend for mobile banking

2025-06-02 13:24:10 +05:30
commit c350c591f6
26 changed files with 4060 additions and 0 deletions
--- a/src/app.js
+++ b/src/app.js
@@ -0,0 +1,21 @@
+const express = require('express');
+const cors = require('cors');
+const pinoHttp = require('pino-http');
+const { logger } = require('./util/logger');
+const routes = require('./routes');
+
+const app = express();
+
+app.use(cors());
+app.use(express.json());
+app.use(express.urlencoded({ extended: true }));
+
+// app.use(pinoHttp({ logger }));
+app.use('/api', routes);
+app.get('/health', (_, res) => res.send('server is healthy'));
+app.use((err, _req, res, _next) => {
+  logger.error(err, 'uncaught error');
+  res.status(500).json({ error: 'INTERNAL SERVER ERROR' });
+});
+
+module.exports = app;
--- a/src/config/config.js
+++ b/src/config/config.js
@@ -0,0 +1,10 @@
+const dotenv = require('dotenv');
+const path = require('path');
+
+dotenv.config({ path: path.resolve(__dirname, '../../.env') });
+
+module.exports = {
+  port: process.env.PORT || 8080,
+  dbUrl: process.env.DATABASE_URL,
+  jwtSecret: process.env.JWT_SECRET,
+};
--- a/src/config/db.js
+++ b/src/config/db.js
@@ -0,0 +1,20 @@
+const { Pool } = require('pg');
+const { dbUrl } = require('./config');
+const { logger } = require('../util/logger');
+
+const pool = new Pool({
+  connectionString: dbUrl,
+});
+
+pool.on('connect', () => {
+  logger.info('connected to Postgres database');
+});
+
+pool.on('error', (err) => {
+  logger.error(err, 'unexpected database pool error');
+});
+
+module.exports = {
+  query: (text, params) => pool.query(text, params),
+  pool,
+};
--- a/src/controllers/auth.controller.js
+++ b/src/controllers/auth.controller.js
@@ -0,0 +1,25 @@
+const { validateUser } = require('../services/auth.service');
+const { generateToken } = require('../util/jwt');
+const { logger } = require('../util/logger');
+
+async function login(req, res) {
+  const { customerNo, password } = req.body;
+
+  if (!customerNo || !password) {
+    return res
+      .status(400)
+      .json({ error: 'customerNo and password are required' });
+  }
+
+  try {
+    const user = await validateUser(customerNo, password);
+    if (!user) return res.status(401).json({ error: 'invalid credentials' });
+    const token = generateToken(user.customer_no);
+    res.json({ token });
+  } catch (err) {
+    logger.error(err, 'login failed');
+    res.status(500).json({ error: 'something went wrong' });
+  }
+}
+
+module.exports = { login };
--- a/src/controllers/details.js
+++ b/src/controllers/details.js
@@ -0,0 +1,9 @@
+const { logger } = require('../util/logger');
+const detailsObject = require('./rajatDetails_wt.json');
+
+function getDetails(user) {
+  logger.info(user);
+  return detailsObject;
+}
+
+module.exports = { getDetails };
--- a/src/controllers/rajatDetails_nt.json
+++ b/src/controllers/rajatDetails_nt.json
@@ -0,0 +1,116 @@
+[
+  {
+    "stAccountNo": "50067217630",
+    "stAccountType": "SA",
+    "stBookingNumber": "SAVING CHQ FOR NONME",
+    "stBranchNo": "00002 ",
+    "stCurrency": "INR",
+    "stProductType": "SAVING CHQ FOR NONME",
+    "stApprovedAmount": null,
+    "stAvailableBalance": "933.84",
+    "stCurrentBalance": "933.84",
+    "custdob": "02051982",
+    "custname": "RAJAT MAHARANA",
+    "mobileno": "919418573848",
+    "custaddress": "DATA CENTRE KCCB CIVIL BAZAR D/SHALA DHARAMSHALA KANGRA",
+    "pincode": "176215",
+    "id": "AMSPM8798H",
+    "activeAccounts": 6,
+    "cifNumber": "30022497139"
+  },
+  {
+    "stAccountNo": "50077736845",
+    "stAccountType": "TD",
+    "stBookingNumber": "TD-LTD-NM-IND -1 Yrs",
+    "stBranchNo": "00002 ",
+    "stCurrency": "INR",
+    "stProductType": "TD-LTD-NM-IND -1 Yrs",
+    "stApprovedAmount": null,
+    "stAvailableBalance": "10000.00",
+    "stCurrentBalance": "10000.00",
+    "custdob": "02051982",
+    "custname": "RAJAT MAHARANA",
+    "mobileno": "919418573848",
+    "custaddress": "DATA CENTRE KCCB CIVIL BAZAR D/SHALA DHARAMSHALA KANGRA",
+    "pincode": "176215",
+    "id": "AMSPM8798H",
+    "activeAccounts": 6,
+    "cifNumber": "30022497139"
+  },
+  {
+    "stAccountNo": "50077742351",
+    "stAccountType": "LN",
+    "stBookingNumber": "DL-AGAINST DEPOSIT",
+    "stBranchNo": "00002 ",
+    "stCurrency": "INR",
+    "stProductType": "DL-AGAINST DEPOSIT",
+    "stApprovedAmount": "10000.00",
+    "stAvailableBalance": "10236.00",
+    "stCurrentBalance": "10236.00",
+    "custdob": "02051982",
+    "custname": "RAJAT MAHARANA",
+    "mobileno": "919418573848",
+    "custaddress": "DATA CENTRE KCCB CIVIL BAZAR D/SHALA DHARAMSHALA KANGRA",
+    "pincode": "176215",
+    "id": "AMSPM8798H",
+    "activeAccounts": 6,
+    "cifNumber": "30022497139"
+  },
+  {
+    "stAccountNo": "50077756089",
+    "stAccountType": "TD",
+    "stBookingNumber": "TD-LTD-NM-IND -1 Yrs",
+    "stBranchNo": "00002 ",
+    "stCurrency": "INR",
+    "stProductType": "TD-LTD-NM-IND -1 Yrs",
+    "stApprovedAmount": null,
+    "stAvailableBalance": "10000.00",
+    "stCurrentBalance": "10000.00",
+    "custdob": "02051982",
+    "custname": "RAJAT MAHARANA",
+    "mobileno": "919418573848",
+    "custaddress": "DATA CENTRE KCCB CIVIL BAZAR D/SHALA DHARAMSHALA KANGRA",
+    "pincode": "176215",
+    "id": "AMSPM8798H",
+    "activeAccounts": 6,
+    "cifNumber": "30022497139"
+  },
+  {
+    "stAccountNo": "50077842356",
+    "stAccountType": "LN",
+    "stBookingNumber": "DL-AGAINST DEPOSIT",
+    "stBranchNo": "00002 ",
+    "stCurrency": "INR",
+    "stProductType": "DL-AGAINST DEPOSIT",
+    "stApprovedAmount": "10000.00",
+    "stAvailableBalance": "10215.00",
+    "stCurrentBalance": "10215.00",
+    "custdob": "02051982",
+    "custname": "RAJAT MAHARANA",
+    "mobileno": "919418573848",
+    "custaddress": "DATA CENTRE KCCB CIVIL BAZAR D/SHALA DHARAMSHALA KANGRA",
+    "pincode": "176215",
+    "id": "AMSPM8798H",
+    "activeAccounts": 6,
+    "cifNumber": "30022497139"
+  },
+  {
+    "stAccountNo": "50078072406",
+    "stAccountType": "LN",
+    "stBookingNumber": "TL-PERSONAL",
+    "stBranchNo": "00002 ",
+    "stCurrency": "INR",
+    "stProductType": "TL-PERSONAL",
+    "stApprovedAmount": "200000.00",
+    "stAvailableBalance": "200825.00",
+    "stCurrentBalance": "200825.00",
+    "custdob": "02051982",
+    "custname": "RAJAT MAHARANA",
+    "mobileno": "919418573848",
+    "custaddress": "DATA CENTRE KCCB CIVIL BAZAR D/SHALA DHARAMSHALA KANGRA",
+    "pincode": "176215",
+    "id": "AMSPM8798H",
+    "activeAccounts": 6,
+    "cifNumber": "30022497139"
+  }
+]
--- a/src/controllers/rajatDetails_wt.json
+++ b/src/controllers/rajatDetails_wt.json
@@ -0,0 +1,212 @@
+[
+  {
+    "stAccountNo": "50067217630",
+    "stAccountType": "SA",
+    "stBookingNumber": "SAVING CHQ FOR NONME",
+    "stBranchNo": "00002 ",
+    "stCurrency": "INR",
+    "stProductType": "SAVING CHQ FOR NONME",
+    "stApprovedAmount": null,
+    "stAvailableBalance": "933.84",
+    "stCurrentBalance": "933.84",
+    "custdob": "02051982",
+    "custname": "RAJAT MAHARANA",
+    "mobileno": "919418573848",
+    "custaddress": "DATA CENTRE KCCB CIVIL BAZAR D/SHALA DHARAMSHALA KANGRA",
+    "pincode": "176215",
+    "id": "AMSPM8798H",
+    "transactions": [
+      {
+        "id": "abcd",
+        "name": "John Doe",
+        "date": "31-05-2025 09:05:31",
+        "type": "CR",
+        "amount": 612
+      },
+      {
+        "id": "efgh",
+        "name": "John Cena",
+        "date": "20-05-2025 09:05:20",
+        "type": "DR",
+        "amount": 10
+      }
+    ],
+    "activeAccounts": 6,
+    "cifNumber": "30022497139"
+  },
+  {
+    "stAccountNo": "50077736845",
+    "stAccountType": "TD",
+    "stBookingNumber": "TD-LTD-NM-IND -1 Yrs",
+    "stBranchNo": "00002 ",
+    "stCurrency": "INR",
+    "stProductType": "TD-LTD-NM-IND -1 Yrs",
+    "stApprovedAmount": null,
+    "stAvailableBalance": "10000.00",
+    "stCurrentBalance": "10000.00",
+    "custdob": "02051982",
+    "custname": "RAJAT MAHARANA",
+    "mobileno": "919418573848",
+    "custaddress": "DATA CENTRE KCCB CIVIL BAZAR D/SHALA DHARAMSHALA KANGRA",
+    "pincode": "176215",
+    "id": "AMSPM8798H",
+    "transactions": [
+      {
+        "id": "abcd",
+        "name": "John Doe",
+        "date": "31-05-2025 09:05:31",
+        "type": "CR",
+        "amount": 10
+      },
+      {
+        "id": "efgh",
+        "name": "John Cena",
+        "date": "20-05-2025 09:05:20",
+        "type": "DR",
+        "amount": 662
+      }
+    ],
+    "activeAccounts": 6,
+    "cifNumber": "30022497139"
+  },
+  {
+    "stAccountNo": "50077742351",
+    "stAccountType": "LN",
+    "stBookingNumber": "DL-AGAINST DEPOSIT",
+    "stBranchNo": "00002 ",
+    "stCurrency": "INR",
+    "stProductType": "DL-AGAINST DEPOSIT",
+    "stApprovedAmount": "10000.00",
+    "stAvailableBalance": "10236.00",
+    "stCurrentBalance": "10236.00",
+    "custdob": "02051982",
+    "custname": "RAJAT MAHARANA",
+    "mobileno": "919418573848",
+    "custaddress": "DATA CENTRE KCCB CIVIL BAZAR D/SHALA DHARAMSHALA KANGRA",
+    "pincode": "176215",
+    "id": "AMSPM8798H",
+    "transactions": [
+      {
+        "id": "abcd",
+        "name": "John Doe",
+        "date": "31-05-2025 09:05:31",
+        "type": "CR",
+        "amount": 676
+      },
+      {
+        "id": "efgh",
+        "name": "John Cena",
+        "date": "20-05-2025 09:05:20",
+        "type": "DR",
+        "amount": 684
+      }
+    ],
+    "activeAccounts": 6,
+    "cifNumber": "30022497139"
+  },
+  {
+    "stAccountNo": "50077756089",
+    "stAccountType": "TD",
+    "stBookingNumber": "TD-LTD-NM-IND -1 Yrs",
+    "stBranchNo": "00002 ",
+    "stCurrency": "INR",
+    "stProductType": "TD-LTD-NM-IND -1 Yrs",
+    "stApprovedAmount": null,
+    "stAvailableBalance": "10000.00",
+    "stCurrentBalance": "10000.00",
+    "custdob": "02051982",
+    "custname": "RAJAT MAHARANA",
+    "mobileno": "919418573848",
+    "custaddress": "DATA CENTRE KCCB CIVIL BAZAR D/SHALA DHARAMSHALA KANGRA",
+    "pincode": "176215",
+    "id": "AMSPM8798H",
+    "transactions": [
+      {
+        "id": "abcd",
+        "name": "John Doe",
+        "date": "31-05-2025 09:05:31",
+        "type": "CR",
+        "amount": 698
+      },
+      {
+        "id": "efgh",
+        "name": "John Cena",
+        "date": "20-05-2025 09:05:20",
+        "type": "DR",
+        "amount": 706
+      }
+    ],
+    "activeAccounts": 6,
+    "cifNumber": "30022497139"
+  },
+  {
+    "stAccountNo": "50077842356",
+    "stAccountType": "LN",
+    "stBookingNumber": "DL-AGAINST DEPOSIT",
+    "stBranchNo": "00002 ",
+    "stCurrency": "INR",
+    "stProductType": "DL-AGAINST DEPOSIT",
+    "stApprovedAmount": "10000.00",
+    "stAvailableBalance": "10215.00",
+    "stCurrentBalance": "10215.00",
+    "custdob": "02051982",
+    "custname": "RAJAT MAHARANA",
+    "mobileno": "919418573848",
+    "custaddress": "DATA CENTRE KCCB CIVIL BAZAR D/SHALA DHARAMSHALA KANGRA",
+    "pincode": "176215",
+    "id": "AMSPM8798H",
+    "transactions": [
+      {
+        "id": "abcd",
+        "name": "John Doe",
+        "date": "31-05-2025 09:05:31",
+        "type": "CR",
+        "amount": 721
+      },
+      {
+        "id": "efgh",
+        "name": "John Cena",
+        "date": "20-05-2025 09:05:20",
+        "type": "DR",
+        "amount": 729
+      }
+    ],
+    "activeAccounts": 6,
+    "cifNumber": "30022497139"
+  },
+  {
+    "stAccountNo": "50078072406",
+    "stAccountType": "LN",
+    "stBookingNumber": "TL-PERSONAL",
+    "stBranchNo": "00002 ",
+    "stCurrency": "INR",
+    "stProductType": "TL-PERSONAL",
+    "stApprovedAmount": "200000.00",
+    "stAvailableBalance": "200825.00",
+    "stCurrentBalance": "200825.00",
+    "custdob": "02051982",
+    "custname": "RAJAT MAHARANA",
+    "mobileno": "919418573848",
+    "custaddress": "DATA CENTRE KCCB CIVIL BAZAR D/SHALA DHARAMSHALA KANGRA",
+    "pincode": "176215",
+    "id": "AMSPM8798H",
+    "transactions": [
+      {
+        "id": "abcd",
+        "name": "John Doe",
+        "date": "31-05-2025 09:05:31",
+        "type": "CR",
+        "amount": 10
+      },
+      {
+        "id": "efgh",
+        "name": "John Cena",
+        "date": "20-05-2025 09:05:20",
+        "type": "DR",
+        "amount": 751
+      }
+    ],
+    "activeAccounts": 6,
+    "cifNumber": "30022497139"
+  }
+]
--- a/src/middlewares/auth.middleware.js
+++ b/src/middlewares/auth.middleware.js
@@ -0,0 +1,25 @@
+const { verifyToken } = require('../util/jwt');
+const { logger } = require('../util/logger');
+
+function auth(req, res, next) {
+  const authHeader = req.headers.authorization;
+
+  if (!authHeader || !authHeader.startsWith('Bearer ')) {
+    return res
+      .status(401)
+      .json({ error: 'missing or malformed authorization header' });
+  }
+
+  const token = authHeader.split(' ')[1];
+
+  try {
+    const payload = verifyToken(token);
+    req.user = payload;
+    next();
+  } catch (err) {
+    logger.error(err, 'error verifying token');
+    return res.status(401).json({ error: 'invalid or expired token' });
+  }
+}
+
+module.exports = auth;
--- a/src/models/user.model.js
+++ b/src/models/user.model.js
--- a/src/routes/auth.js
+++ b/src/routes/auth.js
@@ -0,0 +1,8 @@
+const express = require('express');
+const { login } = require('../controllers/auth.controller');
+
+const router = express.Router();
+
+router.post('/login', login);
+
+module.exports = router;
--- a/src/routes/details.js
+++ b/src/routes/details.js
@@ -0,0 +1,12 @@
+const express = require('express');
+const customerController = require('../controllers/details');
+const auth = require('../middlewares/auth.middleware');
+const router = express.Router();
+
+router.get('/details', auth, (req, res) => {
+  const user = req.user;
+  const details = customerController.getDetails(user);
+  return res.json(details);
+});
+
+module.exports = router;
--- a/src/routes/index.js
+++ b/src/routes/index.js
@@ -0,0 +1,12 @@
+const express = require('express');
+const testRoute = require('./test');
+const authRoute = require('./auth');
+const detailsRoute = require('./details');
+
+const router = express.Router();
+
+router.use('/test', testRoute);
+router.use('/auth', authRoute);
+router.use('/customer', detailsRoute);
+
+module.exports = router;
--- a/src/routes/test.js
+++ b/src/routes/test.js
@@ -0,0 +1,16 @@
+const express = require('express');
+const db = require('../config/db');
+const { logger } = require('../util/logger');
+const router = express.Router();
+
+router.get('/ping-db', async (_req, res) => {
+  try {
+    const result = await db.query('SELECT NOW()');
+    res.json({ time: result.rows[0].now });
+  } catch (err) {
+    logger.error(err);
+    res.status(500).json({ error: err });
+  }
+});
+
+module.exports = router;
--- a/src/server.js
+++ b/src/server.js
@@ -0,0 +1,22 @@
+const app = require('./app');
+const { port } = require('./config/config');
+const { logger } = require('./util/logger');
+const db = require('./config/db');
+
+const server = app.listen(port, () => {
+  logger.info(`server listening on http://localhost:${port}`);
+});
+
+const shutdown = () => {
+  logger.info('shutting down server...');
+  server.close(() => {
+    logger.info('http server closed');
+    db.pool.end(() => {
+      logger.info('pg pool has ended');
+      process.exit(0);
+    });
+  });
+};
+
+process.on('SIGINT', shutdown);
+process.on('SIGTERM', shutdown);
--- a/src/services/auth.service.js
+++ b/src/services/auth.service.js
@@ -0,0 +1,21 @@
+const db = require('../config/db');
+const { comparePassword } = require('../util/hash');
+const { logger } = require('../util/logger');
+
+async function findUserByCustomerNo(customerNo) {
+  const result = await db.query('SELECT * FROM users WHERE customer_no = $1', [
+    customerNo,
+  ]);
+  return result.rows[0];
+}
+
+async function validateUser(customerNo, password) {
+  const user = await findUserByCustomerNo(customerNo);
+  if (!user) return null;
+  logger.info(typeof user);
+  logger.info(user, 'user from database');
+  const isMatch = await comparePassword(password, user.password_hash);
+  return isMatch ? user : null;
+}
+
+module.exports = { validateUser };
--- a/src/util/hash.js
+++ b/src/util/hash.js
@@ -0,0 +1,17 @@
+const bcrypt = require('bcrypt');
+const { logger } = require('./logger');
+
+async function hashPassword(password) {
+  return await bcrypt.hash(password, 10);
+}
+
+async function comparePassword(plain, hash) {
+  const hashedPassword = await hashPassword(plain);
+  logger.info(hashedPassword, 'passed password after hashing');
+  return await bcrypt.compare(plain, hash);
+}
+
+module.exports = {
+  hashPassword,
+  comparePassword,
+};
--- a/src/util/jwt.js
+++ b/src/util/jwt.js
@@ -0,0 +1,15 @@
+const jwt = require('jsonwebtoken');
+const { jwtSecret } = require('../config/config');
+
+function generateToken(payload, expiresIn = '1h') {
+  return jwt.sign({ payload }, jwtSecret, { expiresIn });
+}
+
+function verifyToken(token) {
+  return jwt.verify(token, jwtSecret);
+}
+
+module.exports = {
+  generateToken,
+  verifyToken,
+};
--- a/src/util/logger.js
+++ b/src/util/logger.js
@@ -0,0 +1,22 @@
+const pino = require('pino');
+const isDev = process.env.NODE_ENV !== 'production';
+
+const logger = pino({
+  transport: isDev
+    ? {
+        target: 'pino-pretty',
+        options: {
+          colorize: true,
+          translateTime: 'SYS:standard',
+          ignore: 'pid,hostname',
+        },
+      }
+    : undefined,
+  level: isDev ? 'debug' : 'info',
+});
+
+const requestLogger = (req, _res, next) => {
+  logger.info(`${req.method} ${req.url}`);
+  next();
+};
+module.exports = { logger, requestLogger };