<?php


define("TOKEN", "");  //填写自己的token


class KefuController {

    public function index(){

    }

    public function checkServer(){      // 校验服务器地址URL

        echo('ssss');
        if ( isset ( $_GET ['echostr' ])) {
             $this -> valid();
        } else {
             $this -> responseMsg();
        }
    }
    public function valid()
    {
        $echoStr = $_GET ["echostr" ];
         if ( $this -> checkSignature()){
             header ('content-type:text' );
             echo  $echoStr ;
             exit ;
        } else {
             echo  $echoStr .'+++'. TOKEN;
             exit ;
        }
    }
    private function checkSignature()
    {
        $signature = $_GET ["signature" ];
         $timestamp = $_GET ["timestamp" ];
         $nonce = $_GET ["nonce" ];

        $token = TOKEN;
         $tmpArr = array ( $token , $timestamp , $nonce );
         sort ( $tmpArr , SORT_STRING);
         $tmpStr = implode ( $tmpArr );
         $tmpStr = sha1 ( $tmpStr );

        if ( $tmpStr == $signature ){
             return  true ;
        } else {
             return  false ;
        }
    }
    public function responseMsg()
    {
        $postStr = $GLOBALS ["HTTP_RAW_POST_DATA" ];

        if (! empty ( $postStr ) && is_string ( $postStr )){
             // 禁止引用外部xml实体
            //libxml_disable_entity_loader(true);

            //$postObj = simplexml_load_string($postStr, 'SimpleXMLElement', LIBXML_NOCDATA);
            $postArr = json_decode( $postStr , true );
             if (! empty ( $postArr ['MsgType']) && $postArr ['MsgType'] = = 'text'){    // 文本消息
                $fromUsername = $postArr ['FromUserName'];    // 发送者openid
                $toUserName = $postArr ['ToUserName'];        // 小程序id
                $textTpl = array (
                     "ToUserName" =>$fromUsername ,
                    "FromUserName"=> $toUserName ,
                    "CreateTime"=> time (),
                    "MsgType"=>"transfer_customer_service",
                );
                exit (json_encode( $textTpl ));
            } elseif (! empty ( $postArr ['MsgType']) && $postArr ['MsgType'] == 'image'){ // 图文消息
                $fromUsername = $postArr ['FromUserName'];    // 发送者openid
                $toUserName = $postArr ['ToUserName'];        // 小程序id
                $textTpl = array (
                     "ToUserName"=> $fromUsername ,
                    "FromUserName"=> $toUserName ,
                    "CreateTime"=> time (),
                    "MsgType"=>"transfer_customer_service",
                );
                exit (json_encode( $textTpl ));
            } elseif ( $postArr ['MsgType'] == 'event' && $postArr ['Event']=='user_enter_tempsession'){ // 进入客服动作
                $fromUsername = $postArr ['FromUserName'];    // 发送者openid
                $content = '您好，有什么能帮助你?' ;
                 $data = array (
                     "touser"=> $fromUsername ,
                    "msgtype"=>"text",
                    "text"=> array ("content"=> $content )
                );
                $json = json_encode( $data ,JSON_UNESCAPED_UNICODE);   // php5.4+

                $access_token = $this -> get_accessToken();
                 /*
                 * POST发送https请求客服接口api
                 */
                $url = " https :// api . weixin . qq . com / cgi - bin / message / custom / send ? access _ token = ". $access_token ;
                 // 以'json'格式发送post的https请求
                $ curl = curl_init();
                curl_setopt( $curl , CURLOPT_URL, $url );
                curl_setopt( $curl , CURLOPT_POST, 1); // 发送一个常规的Post请求
                curl_setopt( $curl , CURLOPT_SSL_VERIFYPEER, FALSE );
                curl_setopt( $curl , CURLOPT_SSL_VERIFYHOST, FALSE );
                 if (! empty ( $json )){
                    curl_setopt( $curl , CURLOPT_POSTFIELDS, $json );
                }
                curl_setopt( $curl , CURLOPT_RETURNTRANSFER, 1 );
                 // curl_setopt($curl, CURLOPT_HTTPHEADER, $headers );
                $output = curl_exec( $curl );
                 if (curl_errno( $curl )) {
                     echo 'Errno'.curl_error( $curl ); // 捕抓异常
                }
                curl_close( $curl );
                 if ( $output == 0 ){
                     echo 'success'; exit ;
                }

            } else {
                 exit ('aaa' );
            }
        } else {
             echo "" ;
             exit ;
        }
    }
    /* 调用微信api，获取access_token，有效期7200s -xzz0704 */
    public function get_accessToken(){
         /* 在有效期，直接返回access_token */
        if (S('access_token' )){
             return S('access_token' );
        }
        /* 不在有效期，重新发送请求，获取access_token */
        else {
             $url = ' https :// api . weixin . qq . com / cgi - bin / token ? grant _ type = client _ credential & appid = wx6056 ** **& secret = 30e46f3ef07b **** ' ;
             $result = curl_get_https( $url );
             $res = json_decode($result , true );    // json字符串转数组

            if ( $res ){
                S( 'access_token', $res ['access_token'],7100 );
                 return S('access_token' );
            } else {
                 return 'api return error' ;
            }
        }
    }

}