[BE][Feat] : #42 : 로그인 api 구현

- 로그인을 위한 패키지 (bcrypt, express-validator, jsonwebtoken) 설치
- 로그인을 위한 router, controller, service, repository, middleware 구현
- index.js router 호출 및 사용
- 로그인 api 구현 테스트

backend/package.json

@@ -20,11 +20,14 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
+    "bcrypt": "^5.1.1",
     "dotenv": "^16.4.5",
     "express": "^4.21.1",
+    "express-validator": "^7.2.0",
+    "jsonwebtoken": "^9.0.2",
     "pg": "^8.13.1",
     "swagger-jsdoc": "^6.2.8",
     "swagger-ui-express": "^5.0.1",
-    "ws": "^8.18.0"
+    "ws": "^8.11.0"
   }
 }

backend/src/controllers/authController.js

@@ -0,0 +1,16 @@
+import { loginUser } from '../services/authService.js';
+
+export const login = async (req, res) => {
+  const { id, password } = req.body;
+
+  try {
+    const token = await loginUser(id, password);
+    if (!token) {
+      return res.status(401).json({ message: 'Invalid ID or password' });
+    }
+    return res.status(200).json({ token });
+  } catch (error) {
+    console.error('Login error:', error);
+    return res.status(500).json({ message: 'Server error occurred' });
+  }
+};

backend/src/index.js

@@ -5,7 +5,7 @@ import { specs } from '../swaggerConfig.js';
 import { pool } from './db/db.js';
 import { PORT } from './constants/constants.js';
 import { initializeWebSocketServer } from './websocketServer.js';
-import authRouter from './routes/authRouter.js';
+import { authRouter } from './routes/authRouter.js';
 
 const app = express();
 app.use(express.json());

backend/src/middleware/validationMiddleware.js

@@ -0,0 +1,9 @@
+import { validationResult } from 'express-validator';
+
+export const validationMiddleware = (req, res, next) => {
+  const errors = validationResult(req);
+  if (!errors.isEmpty()) {
+    return res.status(400).json({ errors: errors.array() });
+  }
+  next();
+};

backend/src/repositories/userRepository.js

@@ -0,0 +1,6 @@
+import { pool } from '../db/db.js';
+
+export const findUserById = async id => {
+  const result = await pool.query('SELECT * FROM "main"."user" WHERE id = $1', [id]);
+  return result.rows[0];
+};

backend/src/routes/authRouter.js

@@ -1,11 +1,11 @@
 import express from 'express';
 import { body } from 'express-validator';
 import { login } from '../controllers/authController.js';
-import validationMiddleware from '../middleware/validationMiddleware.js';
+import { validationMiddleware } from '../middleware/validationMiddleware.js';
 
-export const router = express.Router();
+export const authRouter = express.Router();
 
-router.post(
+authRouter.post(
   '/login',
   [
     body('id').notEmpty().withMessage('ID is required'),

backend/src/services/authService.js

@@ -0,0 +1,19 @@
+import bcrypt from 'bcrypt';
+import jwt from 'jsonwebtoken';
+import { findUserById } from '../repositories/userRepository.js';
+
+export const loginUser = async (id, password) => {
+  const user = await findUserById(id);
+  if (!user) {
+    throw new Error('User not found');
+  }
+
+  const isPasswordValid = await bcrypt.compare(password, user.password);
+  if (!isPasswordValid) {
+    throw new Error('Invalid password');
+  }
+
+  // JWT 생성
+  const token = jwt.sign({ userId: user.id }, process.env.JWT_SECRET, { expiresIn: '1h' });
+  return { token, userId: user.id };
+};