Task 9: Add CSRF tokens to form templates and backend processors

Updated forms with hidden CSRF token fields:
- comment_box.php - Comment form
- course_details.php - Course booking form
- campsites.php - Campsite addition modal form
- bar_tabs.php - Bar tab creation modal form
- membership_application.php - Membership application form

Updated backend processors with CSRF validation:
- create_bar_tab.php - Bar tab AJAX processor
- add_campsite.php - Campsite form processor
- submit_order.php - Order submission processor

All forms now require validated CSRF tokens before processing, preventing cross-site request forgery attacks.

add_campsite.php

@@ -4,6 +4,12 @@ require_once("env.php");
 session_start();
 $user_id = $_SESSION['user_id']; // assuming you're storing it like this
 
+// CSRF Token Validation
+if (!isset($_POST['csrf_token']) || !validateCSRFToken($_POST['csrf_token'])) {
+    http_response_code(403);
+    die('Security token validation failed. Please try again.');
+}
+
 // campsites.php
 $conn = openDatabaseConnection();