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<?php
define('BOT_TOKEN', 'XXXXXXXX:XXXXXXXXXXXXXXXXXXXXXXXX'); // place bot token of your bot here
function checkTelegramAuthorization($auth_data) {
$check_hash = $auth_data['hash'];
unset($auth_data['hash']);
$data_check_arr = [];
foreach ($auth_data as $key => $value) {
$data_check_arr[] = $key . '=' . $value;
}
sort($data_check_arr);
$data_check_string = implode("\n", $data_check_arr);
$secret_key = hash('sha256', BOT_TOKEN, true);
$hash = hash_hmac('sha256', $data_check_string, $secret_key);
if (strcmp($hash, $check_hash) !== 0) {
throw new Exception('Data is NOT from Telegram');
}
if ((time() - $auth_data['auth_date']) > 86400) {
throw new Exception('Data is outdated');
}
return $auth_data;
}
function saveTelegramUserData($auth_data) {
$auth_data_json = json_encode($auth_data);
setcookie('tg_user', $auth_data_json);
}
try {
$auth_data = checkTelegramAuthorization($_GET);
saveTelegramUserData($auth_data);
} catch (Exception $e) {
die ($e->getMessage());
}
header('Location: login_example.php');
?>
<?php
define('BOT_USERNAME', 'XXXXXXXXXX'); // place username of your bot here
function getTelegramUserData() {
if (isset($_COOKIE['tg_user'])) {
$auth_data_json = urldecode($_COOKIE['tg_user']);
$auth_data = json_decode($auth_data_json, true);
return $auth_data;
}
return false;
}
if ($_GET['logout']) {
setcookie('tg_user', '');
header('Location: login_example.php');
}
$tg_user = getTelegramUserData();
if ($tg_user !== false) {
$first_name = htmlspecialchars($tg_user['first_name']);
$last_name = htmlspecialchars($tg_user['last_name']);
if (isset($tg_user['username'])) {
$username = htmlspecialchars($tg_user['username']);
$html = "<h1>Hello, <a href=\"https://t.me/{$username}\">{$first_name} {$last_name}</a>!</h1>";
} else {
$html = "<h1>Hello, {$first_name} {$last_name}!</h1>";
}
if (isset($tg_user['photo_url'])) {
$photo_url = htmlspecialchars($tg_user['photo_url']);
$html .= "<img src=\"{$photo_url}\">";
}
$html .= "<p><a href=\"?logout=1\">Log out</a></p>";
} else {
$bot_username = BOT_USERNAME;
$html = <<<HTML
<h1>Hello, anonymous!</h1>
<script async src="https://telegram.org/js/telegram-widget.js?2" data-telegram-login="{$bot_username}" data-size="large" data-auth-url="check_authorization.php"></script>
HTML;
}
echo <<<HTML
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Login Widget Example</title>
</head>
<body><center>{$html}</center></body>
</html>
HTML;
?>
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