Add change password functionality with validation and email notification

Documentation/Auth-API.md

@@ -233,6 +233,92 @@ The new password must contain at least one uppercase letter, one lowercase lette
 
 ---
 
+## Change Password
+
+Changes the authenticated user's password. After a successful change, all refresh sessions are revoked, authentication cookies are cleared, and the user must log in again.
+
+**Endpoint:** `POST` [http://localhost:3070/api/auth/change-password](http://localhost:3070/api/auth/change-password)
+
+**Authentication:** Required
+
+The access token may be supplied through the `access_token` cookie or as a Bearer token:
+
+```http
+Authorization: Bearer <access-token>
+```
+
+### Request body
+
+```json
+{
+  "currentPassword": "CurrentPassword@1234",
+  "newPassword": "NewPassword@5678",
+  "confirmPassword": "NewPassword@5678"
+}
+```
+
+The new password:
+
+- Must match `confirmPassword`
+- Must differ from the current password
+- Must contain at least one uppercase letter
+- Must contain at least one lowercase letter
+- Must contain at least one symbol
+- Must contain at least four digits
+
+### Success response — `200 OK`
+
+```json
+{
+  "success": true,
+  "message": "Password changed successfully. Please login again."
+}
+```
+
+### Error responses
+
+#### `400 Bad Request`
+
+Returned when required fields are missing, the passwords do not match, the new password does not satisfy the password policy, or it matches the current password.
+
+```json
+{
+  "success": false,
+  "message": "New password and confirm password do not match"
+}
+```
+
+#### `401 Unauthorized`
+
+Returned when authentication fails or the current password is incorrect.
+
+```json
+{
+  "success": false,
+  "message": "Current password is incorrect"
+}
+```
+
+#### `404 Not Found`
+
+```json
+{
+  "success": false,
+  "message": "User not found"
+}
+```
+
+#### `500 Internal Server Error`
+
+```json
+{
+  "success": false,
+  "message": "Failed to change password"
+}
+```
+
+---
+
 ## Logout
 
 Deletes the current refresh session when available and clears both authentication cookies.

app/controllers/auth.controller.js

@@ -374,7 +374,119 @@ exports.resetPassword = async (req, res) => {
   }
 };
 
+exports.changePassword = async (req, res) => {
+  try {
+    // User ID comes from authenticate middleware
+    const userId = req.user.id;
 
+    const { currentPassword, newPassword, confirmPassword } = req.body;
+
+    // 1. Check required fields
+    if (!currentPassword || !newPassword || !confirmPassword) {
+      return res.status(400).send({
+        success: false,
+        message:
+          "Current password, new password and confirm password are required",
+      });
+    }
+
+    // 2. Check new password and confirmation
+    if (newPassword !== confirmPassword) {
+      return res.status(400).send({
+        success: false,
+        message: "New password and confirm password do not match",
+      });
+    }
+
+    // 3. Validate password policy
+    const passwordValid = validatePassword(newPassword);
+
+    if (!passwordValid) {
+      return res.status(400).send({
+        success: false,
+        message: "New password does not meet the required criteria",
+      });
+    }
+
+    // 4. Get logged-in user from database
+    const user = await User.findByPk(userId);
+
+    if (!user) {
+      return res.status(404).send({
+        success: false,
+        message: "User not found",
+      });
+    }
+
+    // 5. Check current password
+    const currentPasswordValid = await checkPassword(
+      currentPassword,
+      user.password,
+    );
+
+    if (!currentPasswordValid) {
+      return res.status(401).send({
+        success: false,
+        message: "Current password is incorrect",
+      });
+    }
+
+    // 6. Make sure new password is different
+    const sameAsOldPassword = await checkPassword(newPassword, user.password);
+
+    if (sameAsOldPassword) {
+      return res.status(400).send({
+        success: false,
+        message: "New password must be different from current password",
+      });
+    }
+
+    // 7. Hash new password
+    const hashedPassword = await hashPassword(newPassword);
+
+    // 8. Update user
+    user.password = hashedPassword;
+    user.passwordChangedAt = new Date();
+
+    await user.save();
+
+    // 9. Revoke all refresh sessions
+    deleteAllUserSessions(user.id);
+
+    // 10. Clear auth cookies
+    res.clearCookie("access_token", {
+      httpOnly: true,
+      secure: process.env.NODE_ENV === "production",
+      sameSite: process.env.NODE_ENV === "production" ? "None" : "Lax",
+    });
+
+    res.clearCookie("refresh_token", {
+      httpOnly: true,
+      secure: process.env.NODE_ENV === "production",
+      sameSite: process.env.NODE_ENV === "production" ? "None" : "Lax",
+    });
+
+    // 11. Send confirmation email
+    try {
+      await sendPasswordChangedEmail(user.email, user.firstName);
+    } catch (mailError) {
+      console.error("PASSWORD CHANGED EMAIL ERROR:", mailError);
+    }
+
+    // 12. Response
+    return res.status(200).send({
+      success: true,
+      message: "Password changed successfully. Please login again.",
+    });
+  } catch (error) {
+    console.error("CHANGE PASSWORD ERROR:", error);
+
+    return res.status(500).send({
+      success: false,
+      message: "Failed to change password",
+    });
+  }
+};
 
 // Logout: Clear the JWT cookie
 exports.logout = async (req, res) => {
@@ -390,9 +502,7 @@ exports.logout = async (req, res) => {
       if (session) {
         deleteRefreshSession(session.sessionId);
 
-        console.log(
+        console.log(`Refresh session deleted: ${session.sessionId}`);
-          `Refresh session deleted: ${session.sessionId}`
-        );
       }
     }
 
@@ -400,20 +510,14 @@ exports.logout = async (req, res) => {
     res.clearCookie("access_token", {
       httpOnly: true,
       secure: process.env.NODE_ENV === "production",
-      sameSite:
+      sameSite: process.env.NODE_ENV === "production" ? "None" : "Lax",
-        process.env.NODE_ENV === "production"
-          ? "None"
-          : "Lax",
     });
 
     // 5. Clear refresh token cookie
     res.clearCookie("refresh_token", {
       httpOnly: true,
       secure: process.env.NODE_ENV === "production",
-      sameSite:
+      sameSite: process.env.NODE_ENV === "production" ? "None" : "Lax",
-        process.env.NODE_ENV === "production"
-          ? "None"
-          : "Lax",
     });
 
     // 6. Send response
@@ -421,7 +525,6 @@ exports.logout = async (req, res) => {
       success: true,
       message: "Logged out successfully",
     });
-
   } catch (error) {
     console.error("LOGOUT ERROR:", error);
 

app/routes/auth.routes.js

@@ -27,6 +27,7 @@ router.post('/login', authController.login);
 router.post('/refresh', authController.refreshToken);
 router.post('/forgot-password', authController.forgotPassword);
 router.post('/reset-password', authController.resetPassword);
+router.post('/change-password', authenticate, authController.changePassword);
 router.post('/logout', authController.logout);    
 
 module.exports = router;