56 lines
1.7 KiB
PHP
56 lines
1.7 KiB
PHP
<?php
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require 'config.php';
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header('Content-Type: application/json');
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$usersFile = USERS_DIR . USERS_FILE;
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// Function to authenticate user
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function authenticate($username, $password)
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{
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global $usersFile;
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if (!file_exists($usersFile)) {
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return false;
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}
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$lines = file($usersFile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
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foreach ($lines as $line) {
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list($storedUser, $storedPass, $storedRole) = explode(':', trim($line), 3);
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if ($username === $storedUser && password_verify($password, $storedPass)) {
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return $storedRole; // Return the user's role
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}
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}
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return false;
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}
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// Get JSON input
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$data = json_decode(file_get_contents("php://input"), true);
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$username = trim($data["username"] ?? "");
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$password = trim($data["password"] ?? "");
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// Validate input: ensure both fields are provided.
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if (!$username || !$password) {
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echo json_encode(["error" => "Username and password are required"]);
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exit;
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}
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// Validate username format: allow only letters, numbers, underscores, dashes, and spaces.
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if (!preg_match('/^[A-Za-z0-9_\- ]+$/', $username)) {
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echo json_encode(["error" => "Invalid username format. Only letters, numbers, underscores, dashes, and spaces are allowed."]);
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exit;
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}
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// Authenticate user
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$userRole = authenticate($username, $password);
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if ($userRole !== false) {
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// Regenerate session ID to mitigate session fixation attacks
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session_regenerate_id(true);
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$_SESSION["authenticated"] = true;
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$_SESSION["username"] = $username;
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$_SESSION["isAdmin"] = ($userRole === "1"); // "1" indicates admin
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echo json_encode(["success" => "Login successful", "isAdmin" => $_SESSION["isAdmin"]]);
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} else {
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echo json_encode(["error" => "Invalid credentials"]);
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}
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