Querie Changes

Auth.js

@@ -0,0 +1,130 @@
+const express = require("express");
+const jwt = require("jsonwebtoken");
+const bcrypt = require("bcrypt");
+//https://www.browserling.com/tools/bcrypt
+const bodyParser = require("body-parser");
+
+const app = express();
+app.use(express.json());
+
+// app.use(bodyParser.urlencoded({ extended: true }));
+// app.use(bodyParser.json());
+
+const PORT = 8000;
+
+// Dummy database (for demo purposes, replace with a real database)
+const users = [
+  {
+    userId: "SJ",
+    password: "$2a$10$rOJxeED1y3I.foB6h3IyBeZa95tfRCTrslC.u8JOnNXh.VoxlNa0G",
+  },
+  {
+    userId: "SJ1",
+    password: "$2a$10$m0z1rsQaAwNGulxKfY5fZuFHBCiCZZ4.XPAZwQJjYSJYPXlqTulb.",
+  },
+  {
+    userId: "SJ2",
+    password: "$2a$10$Z7BOVbAA1yOzY0no1gNjYuZX9/J6DvBoJ9.NgND5pgfCAJb7Mgg7e",
+  },
+];
+const secretKey = "your-secret-key";
+
+//Routes
+app.get("/", (req, res) => {
+  res.send("Welcome to the authentication app!");
+});
+
+app.post("/login", (req, res) => {
+  try {
+    if (Object.keys(req.body).length === 0) {
+      return res
+        .status(400)
+        .json({ error: "Invalid data. Please provide valid data." });
+    }
+
+    const { userId, password } = req.body;
+
+    const isUser = users.find((e) => e.userId === userId);
+    console.log("Found user:", isUser);
+
+    if (isUser && bcrypt.compareSync(password, isUser.password)) {
+      // Generate a JWT token
+      const token = jwt.sign(
+        {
+          userId: isUser.userId,
+        },
+        secretKey,
+        { expiresIn: "1h" }
+      );
+      res.json({
+        token,
+      });
+    } else {
+      console.log("Invalid username or password.");
+      res.status(401).json({ message: "Invalid username or password." });
+    }
+  } catch (error) {
+    console.error("Error", error);
+    res.status(500).json({
+      error: `Internal Server Error: ${error.message}`,
+    });
+  }
+});
+
+app.post("/register", (req, res) => {
+  try {
+    if (Object.keys(req.body).length === 0) {
+      return res
+        .status(400)
+        .json({ error: "Invalid data. Please provide valid data." });
+    }
+    const { userId, password } = req.body;
+
+    const isUserExist = users.find((e) => e.userId === userId);
+
+    if (isUserExist) {
+      res
+        .status(400)
+        .json({ message: "Username already exists. Choose another one." });
+    } else {
+      // Hash the password before storing (using bcrypt)
+      const hashedPassword = bcrypt.hashSync(password, 10);
+      // Store the user (replace with database insert)
+      users.push({ userId, password: hashedPassword });
+      res.json({ message: "User Registration successful!" });
+    }
+  } catch (error) {
+    console.error("Error", error);
+    res.status(500).json({
+      error: `Internal Server Error: ${error.message}`,
+    });
+  }
+});
+
+// Protected route
+
+// Middleware to verify JWT token
+const verifyToken = (req, res, next) => {
+  const token = req.headers["authorization"];
+
+  if (!token) {
+    return res.status(403).json({ message: "No token provided." });
+  }
+
+  jwt.verify(token, secretKey, (err, decoded) => {
+    if (err) {
+      return res.status(401).json({ message: "Failed to authenticate token." });
+    }
+
+    req.user = decoded;
+    next();
+  });
+};
+
+app.get("/dashboard", verifyToken, (req, res) => {
+  res.json({ message: "You have access to this protected route!" });
+});
+
+app.listen(PORT, () => {
+  console.log(`http://localhost:${PORT}`);
+});

Middleware.js

@@ -0,0 +1,22 @@
+const express = require("express");
+const app = express();
+
+app.use((req, res, next) => {
+  console.log("Middleware 1 ");
+  req.customProperty = "Hello from Middleware 1";
+  next();
+});
+
+app.use((req, res, next) => {
+  console.log("Middleware 2");
+  console.log(req.customProperty);
+  next();
+});
+
+app.get("/", (req, res) => {
+  res.send("HEllo Express");
+});
+
+app.listen(3000, () => {
+  console.log("Server running on 3000");
+});