微信jssdk

<?php
/*
* Copyright    (c)    
* All rights reserved.
*
* 文件名称:    wx_jssdk
* 摘    要: 微信js_sdk config接口注入
* 
* $Id: wx_jssdk.php 162850 2019-04-02 09:13:15Z niezichuan $
*/

require_once dirname(__FILE__) . "/../function/cache.php";

class JSSDK
{
    private $appId;
    private $appSecret;
    private $mMemcache = null;
    public $url;

    public function __construct($appId, $appSecret)
    {
        $this->appId = $appId;
        $this->appSecret = $appSecret;
        $this->getMemcacheHost();
        $this->url = -1;
    }

    //获取注入信息用于调用基础接口
    public function getSignPackage()
    {
        $jsapiTicket = $this->getJsApiTicket();

        // 注意 URL 一定要动态获取，不能 hardcode.
        if($this->url >= 0)
        {
            $url = $this->url;
        }
        else
        {
            $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
            // $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
            $url = "https://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
        }

        $timestamp = time();
        $nonceStr = $this->createNonceStr();

        // 这里参数的顺序要按照 key 值 ASCII 码升序排序
        $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";

        $signature = sha1($string);

        $signPackage = array(
            "appId" => $this->appId,
            "nonceStr" => $nonceStr,
            "timestamp" => $timestamp,
            "url" => $url,
            "signature" => $signature,
            "rawString" => $string
        );
        return $signPackage;
    }

    //生成签名随机串
    private function createNonceStr($length = 16)
    {
        $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        $str = "";
        for ($i = 0; $i < $length; $i++) {
            $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
        }
        return $str;
    }

    //获取ticket
    private function getJsApiTicket()
    {
        // jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
        $data = json_decode($this->mMemcache->get('jsapi_ticket_' . $this->appId));
        if ($data->expire_time < time()) {
            $accessToken = $this->getAccessToken();
            // 获取 ticket
            $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
            $res = json_decode($this->httpGet($url));
            $ticket = $res->ticket;
            if ($ticket) {
                $data->expire_time = time() + 7000;
                $data->jsapi_ticket = $ticket;
                $this->mMemcache->set("jsapi_ticket_" . $this->appId, json_encode($data), 0,MEMCACHE_LONG);
            }
        } else {
            $ticket = $data->jsapi_ticket;
        }
        return $ticket;
    }

    //获取accesstoken
    private function getAccessToken()
    {
        // access_token 应该全局存储与更新，以下代码以写入到文件中做示例
        $data = json_decode($this->mMemcache->get("jsapi_access_token_" . $this->appId));
        if ($data->expire_time < time()) {
            // 获取access_token
            $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
            $res = json_decode($this->httpGet($url));
            $access_token = $res->access_token;
            if ($access_token) {
                $data->expire_time = time() + 7000;
                $data->access_token = $access_token;
                $this->mMemcache->set("jsapi_access_token_" . $this->appId, json_encode($data), 0,MEMCACHE_LONG);
            }
        } else {
            $access_token = $data->access_token;
        }
        return $access_token;
    }

    //调用接口获取数据
    private function httpGet($url)
    {
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_TIMEOUT, 500);
        // 为保证第三方服务器与微信服务器之间数据传输的安全性，所有微信接口采用https方式调用，必须使用下面2行代码打开ssl安全校验。
        // 如果在部署过程中代码在此处验证失败，请到 http://curl.haxx.se/ca/cacert.pem 下载新的证书判别文件。
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 2);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
        curl_setopt($curl, CURLOPT_URL, $url);

        $res = curl_exec($curl);
        curl_close($curl);

        return $res;
    }

    //引入memcacahe
    public function getMemcacheHost()
    {
        global $mem;
        $this->mMemcache = $mem;
    }

}