QQ互联OAuth

/**
 * QQ互联 oauth
 * @author dyllen
 *
 */
class Oauth
{
    //取Authorization Code Url
    const PC_CODE_URL = 'https://graph.qq.com/oauth2.0/authorize';
     
    //取Access Token Url
    const PC_ACCESS_TOKEN_URL = 'https://graph.qq.com/oauth2.0/token';
     
    //取用户 Open Id Url
    const OPEN_ID_URL = 'https://graph.qq.com/oauth2.0/me';
     
    //用户授权之后的回调地址
    public $redirectUri = null;
     
    // App Id
    public $appid = null;
     
    //App Key
    public $appKey = null;
     
    //授权列表
    //字符串，多个用逗号隔开
    public $scope = null;
     
    //授权code
    public $code = null;
     
    //续期access token的凭证
    public $refreshToken = null;
     
    //access token
    public $accessToken = null;
     
    //access token 有效期，单位秒
    public $expiresIn = null;
     
    //state
    public $state = null;
     
    public $openid = null;
     
    //construct
    public function __construct($config=[])
    {
        foreach($config as $key => $value) {
            $this->$key = $value;
        }
    }
     
    /**
     * 得到获取Code的url
     * @throws InvalidArgumentException
     * @return string
     */
    public function codeUrl()
    {
        if (!$this->redirectUri) {
            throw new Exception('parameter $redirectUri must be set.');
        }
        $query = [
                'response_type' => 'code',
                'client_id' => $this->appid,
                'redirect_uri' => $this->redirectUri,
                'state' => $this->getState(),
                'scope' => $this->scope,
        ];
     
        return self::PC_CODE_URL . '?' . http_build_query($query);
    }
     
    /**
     * 取access token
     * @throws Exception
     * @return boolean
     */
    public function getAccessToken()
    {
        $params = [
                'grant_type' => 'authorization_code',
                'client_id' => $this->appid,
                'client_secret' => $this->appKey,
                'code' => $this->code,
                'redirect_uri' => $this->redirectUri,
        ];
     
        $url = self::PC_ACCESS_TOKEN_URL . '?' . http_build_query($params);
        $content = $this->getUrl($url);
        parse_str($content, $res);
        if ( !isset($res['access_token']) ) {
            $this->thrwoError($content);
        }
     
        $this->accessToken = $res['access_token'];
        $this->expiresIn = $res['expires_in'];
        $this->refreshToken = $res['refresh_token'];
     
        return true;
    }
     
    /**
     * 刷新access token
     * @throws Exception
     * @return boolean
     */
    public function refreshToken()
    {
        $params = [
                'grant_type' => 'refresh_token',
                'client_id' => $this->appid,
                'client_secret' => $this->appKey,
                'refresh_token' => $this->refreshToken,
        ];
     
        $url = self::PC_ACCESS_TOKEN_URL . '?' . http_build_query($params);
        $content = $this->getUrl($url);
        parse_str($content, $res);
        if ( !isset($res['access_token']) ) {
            $this->thrwoError($content);
        }
     
        $this->accessToken = $res['access_token'];
        $this->expiresIn = $res['expires_in'];
        $this->refreshToken = $res['refresh_token'];
     
        return true;
    }
     
    /**
     * 取用户open id
     * @return string
     */
    public function getOpenid()
    {
        $params = [
                'access_token' => $this->accessToken,
        ];
     
        $url = self::OPEN_ID_URL . '?' . http_build_query($params);
             
        $this->openid = $this->parseOpenid( $this->getUrl($url) );
         
        return $this->openid;
    }
     
    /**
     * get方式取url内容
     * @param string $url
     * @return mixed
     */
    public function getUrl($url)
    {
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        curl_setopt($ch, CURLOPT_URL, $url);
        $response =  curl_exec($ch);
        curl_close($ch);
     
        return $response;
    }
     
    /**
     * post方式取url内容
     * @param string $url
     * @param array $keysArr
     * @param number $flag
     * @return mixed
     */
    public function postUrl($url, $keysArr, $flag = 0)
    {
        $ch = curl_init();
        if(! $flag) curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $keysArr);
        curl_setopt($ch, CURLOPT_URL, $url);
        $ret = curl_exec($ch);
     
        curl_close($ch);
        return $ret;
    }
     
     
    /**
     * 取state
     * @return string
     */
    protected function getState()
    {
        $this->state = md5(uniqid(rand(), true));
        //state暂存在缓存里面
        //自己定义
                //。。。。。。。。。
     
        return $this->state;
    }
     
    /**
     * 验证state
     * @return boolean
     */
    protected function verifyState()
    {
        //。。。。。。。
    }
     
    /**
     * 抛出异常
     * @param string $error
     * @throws Exception
     */
    protected function thrwoError($error)
    {
        $subError = substr($error, strpos($error, "{"));
        $subError = strstr($subError, "}", true) . "}";
        $error = json_decode($subError, true);
         
        throw new Exception($error['error_description'], (int)$error['error']);
    }
     
    /**
     * 从获取openid接口的返回数据中解析出openid
     * @param string $str
     * @return string
     */
    protected function parseOpenid($str)
    {
        $subStr = substr($str, strpos($str, "{"));
        $subStr = strstr($subStr, "}", true) . "}";
        $strArr = json_decode($subStr, true);
        if(!isset($strArr['openid'])) {
            $this->thrwoError($str);
        }
         
        return $strArr['openid'];
    }
}