addUser added for admins only

addUser.php

@@ -0,0 +1,43 @@
+<?php
+session_start();
+header('Content-Type: application/json');
+
+$usersFile = 'users.txt';
+
+// Only allow admins to add users
+if (!isset($_SESSION['authenticated']) || $_SESSION['authenticated'] !== true || !isset($_SESSION['isAdmin']) || $_SESSION['isAdmin'] !== true) {
+    echo json_encode(["error" => "Unauthorized"]);
+    exit;
+}
+
+// Get input data
+$data = json_decode(file_get_contents("php://input"), true);
+$newUsername = trim($data["username"] ?? "");
+$newPassword = trim($data["password"] ?? "");
+$isAdmin = !empty($data["isAdmin"]) ? "1" : "0"; // Store as "1" for admin, "0" for user
+
+// Validate input
+if (!$newUsername || !$newPassword) {
+    echo json_encode(["error" => "Username and password required"]);
+    exit;
+}
+
+// Check if username already exists
+$existingUsers = file($usersFile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
+foreach ($existingUsers as $line) {
+    list($storedUser, $storedHash, $storedRole) = explode(':', trim($line));
+    if ($newUsername === $storedUser) {
+        echo json_encode(["error" => "User already exists"]);
+        exit;
+    }
+}
+
+// Hash the password
+$hashedPassword = password_hash($newPassword, PASSWORD_BCRYPT);
+
+// Append new user to users.txt
+$newUserLine = $newUsername . ":" . $hashedPassword . ":" . $isAdmin . PHP_EOL;
+file_put_contents($usersFile, $newUserLine, FILE_APPEND);
+
+echo json_encode(["success" => "User added successfully"]);
+?>