//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_secret' => $this->appKey,'code' => $this->code,];

$url = self::PC_ACCESS_TOKEN_URL . '?' . http_build_query($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','refresh_token' => $this->refreshToken,$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->par<a href="https://www.jb51.cc/tag/SEO/" title="SEO">SEO</a>penid( $this->getUrl($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_POST,CURLOPT_POSTFIELDS,$keysArr);
  curl_setopt($ch,$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'];

}
}