public function actionAuth($provider)
{
    // 导入OAuth2China
    Yii::import('ext.OAuth2China.OAuth2China');

    // 配置给平台参数
    $providers = array(
        'weibo' => array(
            'id' => 'App key',
            'secret' => 'App secret',
        ),
        'qq' => array(
            'id' => 'APP ID',
            'secret' => 'APP KEY',
        ),
        'douban' => array(
            'id' => 'API Key',
            'secret' => 'Secret',
        ),
        'renren' => array(
            'id' => 'API key',
            'secret' => 'Secret key',
        ),
    );

    $OAuth2China = new OAuth2China($providers);

    $provider = $OAuth2China->getProvider($provider);

    if(!isset($_GET['code']))
    {
        // 跳转到授权页面
        $provider->redirect();
    }
    else
    {
        $token = $provider->getAccessToken($_GET['code']);
        var_dump($token);
    }
}