There! Use it!

Author: GreenRunchly

.env

@@ -0,0 +1,6 @@
+DB_HOST = "localhost"
+DB_USERNAME = "root"
+DB_PASSWORD = ""
+DB_NAME = "node_api"
+DB_PORT = 3306
+HTTP_PORT = 9002

.gitignore

@@ -0,0 +1 @@
+/node_modules

app.js

@@ -0,0 +1,147 @@
+// DotEnv Config
+require('dotenv').config(); // Load Configuration
+
+// WebServer Library untuk handle incoming client, etc.
+const cors = require('cors');
+const express = require('express');
+const validator = require('express-validator');
+const jwt = require('jsonwebtoken');
+const app = express();
+app.use(cors()); // Menggunakan CORS agar api dapat dipakai oleh siapa saja (tanpa perlu origin server)
+app.use(express.json()); // Untuk mengurai JSON
+app.use(express.urlencoded({ extended: true })); // Untuk mengurai URL-encoded
+
+// Password Encryption
+const bcrypt = require('bcrypt');
+const saltRounds = 10; // Number of rounds for salting, similar to cost factor in PHP
+async function hashPassword(password) {
+    const hashedPassword = await bcrypt.hash(password, saltRounds);
+    return hashedPassword;
+}
+async function verifyPassword(password, hashedPassword) {
+    const isMatch = await bcrypt.compare(password, hashedPassword);
+    return isMatch;
+}
+
+// Validasi input
+function validatorResult(req, res, next) {
+    const validation = validator.validationResult(req);
+    if (!validation.isEmpty()) {
+        res.status(200).json({
+			code : 'error',
+            msg : validation.errors[0].msg
+        });
+        return true;
+    }else{
+        return false;
+    }
+}
+
+// Koneksi mysql
+const mysql = require('mysql2');
+const pooldb = mysql.createPool({
+    host: process.env.DB_HOST,
+    user: process.env.DB_USERNAME,
+    password: process.env.DB_PASSWORD,
+    database: process.env.DB_NAME,
+    port: process.env.DB_PORT,
+	multipleStatements: true
+});
+
+// Middleware Token Auth
+const authenticateToken = (req, res, next) => {
+    const authHeader = req.headers['authorization'];
+    const token = authHeader && authHeader.split(' ')[1];  // Bearer <token>
+
+    if (token == null) return res.sendStatus(401);  // No token present
+
+    jwt.verify(token, 'SECRET_KEY', (err, user) => {
+        if (err) return res.sendStatus(403);  // Invalid token
+
+        req.user = user;
+        next();
+    });
+};
+
+// REST API Stateless
+app.post('/login', [
+    validator.body('username').not().isEmpty().withMessage('Masukan username').trim().escape(),
+	validator.body('password').not().isEmpty().withMessage('Masukan password').trim().escape()
+], (req, res) => { if ( validatorResult(req, res) ){ return; }
+
+	let {username, password} = req.body;
+
+	let sqlsyn = ` SELECT * FROM user WHERE username=?; `;
+	pooldb.query(sqlsyn, [username], async (err, result) => {
+		if (err){ 
+			console.log(err);
+		} else {
+            if (result[0]){
+                let userData = result[0];
+                hashedPassword = userData.password;
+                
+                verifyPassword(password, hashedPassword).then((isMatch) => {
+                    if (isMatch) {
+                        const token = jwt.sign({ username }, 'SECRET_KEY', { expiresIn: '1h' });
+                        res.json({
+                            code : "ok",
+                            msg : "Berhasil Masuk!",
+                            data : {
+                                userData,
+                                token
+                            }
+                        });
+                    } else {
+                        res.json({
+                            code : "error",
+                            msg : "Password salah!"
+                        });
+                    }
+                });
+            }else{
+                res.json({
+                    code : "error",
+                    msg : "User tidak ditemukan"
+                });
+            }            
+		}
+	});
+});
+
+app.get('/check/:username', authenticateToken, (req, res) => { if ( validatorResult(req, res) ){ return; }
+
+	let {username} = req.params;
+
+	let sqlsyn = ` SELECT * FROM user WHERE username=?; `;
+	pooldb.query(sqlsyn, [username], async (err, result) => {
+		if (err){ 
+			console.log(err);
+		} else {
+            if (result[0]){
+                let userData = result[0];
+                res.json({
+                    code : "ok",
+                    msg : "User ditemukan!",
+                    data : {userData}
+                });
+            }else{
+                res.json({
+                    code : "error",
+                    msg : "User tidak ditemukan!"
+                });
+            }            
+		}
+	});
+});
+
+app.get('/*', (req, res) => {
+	res.json({
+		code : "error",
+		msg : "API Invalid"
+	})
+});
+
+app.listen(process.env.HTTP_PORT, () => {
+  	console.log(`Server dengan port ${process.env.HTTP_PORT} berjalan...`);
+});
+

module-tools.js

@@ -0,0 +1,18 @@
+/*
+    Module untuk penanganan generate random number dan lainnya di masa mendatang
+    Daftar Function : 
+    numberGen( jumlahDigit ); return angka
+*/
+
+let tools = {};
+
+// Number Gen (Hanya jarak 2-Sekian)
+tools.numberGen = function (antara=6){
+    let digit = '';
+    for (let index = 1; index < antara; index++) {
+        digit += '0';
+    }
+    return Math.floor( parseInt('1' + digit) + ( Math.random() * parseInt('9' + digit) ) );
+}
+
+module.exports = tools;