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implemented a simple backend for mobile banking

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This commit is contained in:
Md Asif
2025-06-02 13:24:10 +05:30
commit c350c591f6
26 changed files with 4060 additions and 0 deletions
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9
.editorconfig Normal file
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root = true
[*]
indent_style = space
indent_size = 2
end_of_line = lf
charset = utf-8
trim_trailing_whitespace = true
insert_final_newline = true

3
.env Normal file
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PORT=8080
DATABASE_URL=postgresql://kmobile_app_rw:kmobile@localhost:5432/kmobile_banking
JWT_SECRET=supersecret

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.gitignore vendored Normal file
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node_modules/

2
.prettierignore Normal file
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node_modules
dist

7
.prettierrc Normal file
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{
"semi": true,
"singleQuote": true,
"tabwidth": 2,
"printWidth": 80,
"trailingComma": "es5"
}

39
eslint.config.js Normal file
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import eslintPluginPrettier from 'eslint-plugin-prettier';
import eslintConfigPrettier from 'eslint-config-prettier';
import js from '@eslint/js';
import globals from 'globals';
import { readFileSync } from 'fs';
import path from 'path';
export default [
{
ignores: ['node_modules', 'dist'],
},
{
files: ['**/*.js'],
languageOptions: {
ecmaVersion: 'latest',
sourceType: 'commonjs',
globals: {
...globals.node,
},
},
plugins: {
prettier: eslintPluginPrettier,
},
rules: {
...js.configs.recommended.rules,
'prettier/prettier': 'error',
'no-console': 'off',
'consistent-return': 'off',
'no-underscore-dangle': 'off',
},
},
{
settings: {
prettier: JSON.parse(
readFileSync(path.resolve('./.prettierrc'), 'utf-8')
),
},
},
];

3379
package-lock.json generated Normal file
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37
package.json Normal file
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{
"name": "yume_js",
"version": "1.0.0",
"main": "index.js",
"scripts": {
"dev": "nodemon src/server.js",
"start": "node src/server.js",
"lint": "eslint .",
"format": "prettier --write ."
},
"keywords": [],
"author": "",
"license": "ISC",
"description": "",
"dependencies": {
"bcrypt": "^6.0.0",
"cors": "^2.8.5",
"dotenv": "^16.5.0",
"express": "^5.1.0",
"jsonwebtoken": "^9.0.2",
"pg": "^8.16.0",
"pino": "^9.7.0",
"pino-http": "^10.4.0"
},
"devDependencies": {
"@eslint/js": "^9.28.0",
"eslint": "^9.28.0",
"eslint-config-prettier": "^10.1.5",
"eslint-plugin-prettier": "^5.4.1",
"globals": "^16.2.0",
"husky": "^9.1.7",
"lint-staged": "^16.1.0",
"nodemon": "^3.1.10",
"pino-pretty": "^13.0.0",
"prettier": "^3.5.3"
}
}

21
src/app.js Normal file
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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;

10
src/config/config.js Normal file
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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,
};

20
src/config/db.js Normal file
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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,
};

25
src/controllers/auth.controller.js Normal file
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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 };

9
src/controllers/details.js Normal file
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const { logger } = require('../util/logger');
const detailsObject = require('./rajatDetails_wt.json');
function getDetails(user) {
logger.info(user);
return detailsObject;
}
module.exports = { getDetails };

116
src/controllers/rajatDetails_nt.json Normal file
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[
{
"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"
}
]

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src/controllers/rajatDetails_wt.json Normal file
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[
{
"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"
}
]

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src/middlewares/auth.middleware.js Normal file
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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;

0
src/models/user.model.js Normal file
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src/routes/auth.js Normal file
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const express = require('express');
const { login } = require('../controllers/auth.controller');
const router = express.Router();
router.post('/login', login);
module.exports = router;

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src/routes/details.js Normal file
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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;

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src/routes/index.js Normal file
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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;

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src/routes/test.js Normal file
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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;

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src/server.js Normal file
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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);

21
src/services/auth.service.js Normal file
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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 };

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src/util/hash.js Normal file
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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,
};

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src/util/jwt.js Normal file
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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,
};

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src/util/logger.js Normal file
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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 };