oschina openapi php 调用

应用时基于yii的。目前流程如下：

生成oschina授权链接

用户访问该链接之后得到 code

利用code换取access_token

代码：

 */class OschinaOauth extends CComponent{ public $ak; public $sk; public $callback; private $host = 'https://www.oschina.net'; public function init() { } /**  * 获取授权链接  * @return string  */ public function getRedirectUrl() {  $params = array(    'response_type' => 'code',    'client_id' => $this->ak,    'redirect_uri' => Yii::app()->createAbsoluteUrl($this->callback)  );  return $this->host . '/action/oauth2/authorize?' . http_build_query($params); } /**  * 获取AccessToken  * @param $code  * @return string  * @throws CException  * @throws Exception  */ public function getAccessToken($code) {  $params = array(    'client_id' => $this->ak,    'client_secret' => $this->sk,    'grant_type' => 'authorization_code',    'code' => $code,    'dataType' => 'json'  );  $url = $this->host . '/action/openapi/token';  $resp = Request::post($url, $params);  $data = json_decode($resp,true);  return $data; } public function refreshAccessToken() { }}

 */class OauthController extends Controller{ public function actionCallback($code, $state) {  $data = Yii::app()->oauth->getAccessToken($code);  print_r($data); } public function actionRedirect() {  $url = Yii::app()->oauth->getRedirectUrl();  $this->redirect($url); }}

目前的问题是可以得到 code，但是利用code去oschina获取access_token的时候报错了。