轻松实现Apple登录：patrickbussmann/oauth2-apple助力PHP应用

<code>composer require patrickbussmann/oauth2-apple</code>

<code class="php">// 引入必要的类
use League\OAuth2\Client\Provider\Apple;
use Firebase\JWT\JWT;

// 解决时钟偏移问题
JWT::$leeway = 60;

// 配置 Provider
$provider = new Apple([
    'clientId'          => '{apple-client-id}',
    'teamId'            => '{apple-team-id}',
    'keyFileId'         => '{apple-key-file-id}',
    'keyFilePath'       => '{apple-key-file-path}',
    'redirectUri'       => 'https://example.com/callback-url',
]);

// 如果没有授权码，则获取授权码
if (!isset($_GET['code'])) {
    $authorizationUrl = $provider->getAuthorizationUrl();
    $_SESSION['oauth2state'] = $provider->getState();
    header('Location: '.$authorizationUrl);
    exit;
} // 验证 state，防止 CSRF 攻击
elseif (empty($_GET['state']) || ($_GET['state'] !== $_SESSION['oauth2state'])) {
    unset($_SESSION['oauth2state']);
    exit('Invalid state');
} // 获取访问令牌
else {
    $token = $provider->getAccessToken('authorization_code', [
        'code' => $_GET['code']
    ]);

    // 获取用户信息 (注意：只有首次登录才能获取完整信息)
    try {
        $user = $provider->getResourceOwner($token);
        printf('Hello %s!', $user->getFirstName());
    } catch (Exception $e) {
        exit('Failed to get user details');
    }

    // 使用访问令牌
    echo $token->getToken();
}</code>