protect with xss for login

Sean/server.js

@@ -6,7 +6,7 @@ const bcrypt = require("bcrypt");
 const crypto = require("crypto");
 const nodemailer = require("nodemailer");
 const otpGenerator = require('otp-generator');
-
+const { body, validationResult } = require('express-validator');
 
 const { transporter } = require("./modules/nodeMailer");
 const { connection } = require("./modules/mysql"); 
@@ -20,7 +20,7 @@ require("dotenv").config();
 app.use(bodyParser.urlencoded({ extended: true }));
 app.use(
 	session({
-		secret: "your_session_secret",
+		secret: process.env.key,
 		resave: false,
 		saveUninitialized: true,
 	})
@@ -100,8 +100,19 @@ const logActivity = async (username, success, message) => {
   
   
   // Login route
-  app.post("/login", async (req, res) => {
+  app.post('/login',[
+	  body('username').escape().trim().isLength({ min: 1 }).withMessage('Username must not be empty'),
+	  body('password').escape().trim().isLength({ min: 1 }).withMessage('Password must not be empty'),
+	],
+	async (req, res) => {
 	  try {
+		const errors = validationResult(req);
+  
+		if (!errors.isEmpty()) {
+		  // Handle validation errors, e.g., return an error message to the client
+		  return res.render('login', { error: 'Invalid input. Please check your credentials.' });
+		}
+  
 		let { username, password } = req.body;
 		username = username.trim();
   
@@ -160,7 +171,8 @@ const logActivity = async (username, success, message) => {
 		console.error("Error in login route:", error);
 		res.status(500).send("Internal Server Error");
 	  }
-  });
+	}
+  );
   app.post("/verify-otp", async (req, res) => {
 	try {
 	  const enteredOTP = req.body.otp;

Sean/views/login.ejs

@@ -94,11 +94,5 @@ button:hover {
       <p>If you have forgotten your password, please <span class="reset-link" onclick="location.href='/forgot-password'">reset here</span>.</p>
     </div>
   </div>
-  <script>
-    // Function to escape HTML characters
-    function escapeHTML(str) {
-      return str.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;").replace(/"/g, "&quot;").replace(/'/g, "&#39;");
-    }
-  </script>
 </body>
 </html>

package-lock.json

@@ -293,13 +293,6 @@
       "integrity": "sha512-FveZTNuGw04cxlAiWbzi6zTAL/lhehaWbTtgluJh4/E95DqMwTmha3KZN1aAWA8cFIhHzMZUvLevkw5Rqk+tSQ==",
       "requires": {
         "safe-buffer": "5.2.1"
-      },
-      "dependencies": {
-        "safe-buffer": {
-          "version": "5.2.1",
-          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
-          "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
-        }
       }
     },
     "content-type": {
@@ -498,11 +491,6 @@
             "iconv-lite": "0.4.24",
             "unpipe": "1.0.0"
           }
-        },
-        "safe-buffer": {
-          "version": "5.2.1",
-          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
-          "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
         }
       }
     },
@@ -546,6 +534,15 @@
         }
       }
     },
+    "express-validator": {
+      "version": "7.0.1",
+      "resolved": "https://registry.npmjs.org/express-validator/-/express-validator-7.0.1.tgz",
+      "integrity": "sha512-oB+z9QOzQIE8FnlINqyIFA8eIckahC6qc8KtqLdLJcU3/phVyuhXH3bA4qzcrhme+1RYaCSwrq+TlZ/kAKIARA==",
+      "requires": {
+        "lodash": "^4.17.21",
+        "validator": "^13.9.0"
+      }
+    },
     "filelist": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/filelist/-/filelist-1.0.4.tgz",
@@ -1207,6 +1204,11 @@
         "glob": "^7.1.3"
       }
     },
+    "safe-buffer": {
+      "version": "5.2.1",
+      "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
+      "integrity": "sha512-rp3So07KcdmmKbGvgaNxQSJr7bGVSVk5S9Eq1F+ppbRo70+YeaDxkw5Dd8NPN+GD6bjnYm2VuPuCXmpuYvmCXQ=="
+    },
     "safer-buffer": {
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",

package.json

@@ -23,6 +23,7 @@
     "ejs": "^3.1.9",
     "express": "^4.18.2",
     "express-session": "^1.17.3",
+    "express-validator": "^7.0.1",
     "helmet": "^7.1.0",
     "mqtt": "^5.3.3",
     "mysql2": "^3.6.5",