<?php
namespace  addons\qingdongams\library\wx;

class Jscode {
  private $appId;
  private $appSecret;

  public function __construct($appId, $appSecret) {
    $this->appId = $appId;
    $this->appSecret = $appSecret;
  }



  private function getAccessToken() {
      $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
      $res = json_decode($this->httpGet($url));
      $access_token = $res->access_token;
    return $access_token;
  }
    /**
     * 获取用户的openid
     * @param  string $openid [description]
     * @return [type]         [description]
     */
    public function baseAuth()
    {

        if (!isset($_GET['code'])){

            //触发微信返回code码
            $baseUrl = urlencode('http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'].$_SERVER['QUERY_STRING']);
            $url = $this->createCode($baseUrl);
            Header("Location: $url");
            exit();

        }
        //2.静默授权,获取code
        //页面跳转至redirect_uri/?code=CODE&state=STATE
        $code = $_GET['code'];


        //3.通过code换取网页授权access_token和openid
        $curl = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid=' . $this->appId . '&secret=' . $this->appSecret . '&code=' . $code . '&grant_type=authorization_code';
        $content = $this->httpGet($curl);
        $result = json_decode($content, true);

        return $result;
    }
        //关注公众号
   public function wxinterest(){
       $wxInfo = $this->baseAuth();

       $accessToken = $this->getAccessToken();
       $url =  'https://api.weixin.qq.com/cgi-bin/user/info?access_token='.$accessToken.'&openid='.$wxInfo['openid'];
       $res = json_decode($this->httpGet($url));
      return $res;
   }
  //判断是否关注公众号
  public function isWx(){
    $gzxx = $this->wxinterest();
    $gzxx = $gzxx->subscribe;
    return $gzxx;
  }

  private function httpGet($url) {
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_TIMEOUT, 500);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
    curl_setopt($curl, CURLOPT_URL, $url);

    $res = curl_exec($curl);
    curl_close($curl);

    return $res;
  }
    /**
     *
     * 拼接签名字符串
     * @param array $urlObj
     *
     * @return 返回已经拼接好的字符串
     */
    private function ToUrlParams($urlObj)
    {
        $buff = "";
        foreach ($urlObj as $k => $v)
        {
            if($k != "sign"){
                $buff .= $k . "=" . $v . "&";
            }
        }

        $buff = trim($buff, "&");
        return $buff;
    }
    //获取code
    public function createCode($url){
        $urlObj["appid"] = $this->appId;
        $urlObj["redirect_uri"] = "$url";
        $urlObj["response_type"] = "code";
        $urlObj["scope"] = "snsapi_userinfo";
        $urlObj["state"] = "STATE"."#wechat_redirect";
        $bizString = $this->ToUrlParams($urlObj);
        return "https://open.weixin.qq.com/connect/oauth2/authorize?".$bizString;
    }
}