微信自定义分享那些事

作者: dreamfly 分类: html,php 发布时间: 2020-09-17 14:44

自定义分享

分享的时候,网站可以指定用户分享的内容和图片,叫做自定义分享,根据微信提供的jsapi,我们可以实现网页的分享标题,描述,图片和链接的指定分享。

使用条件

要想使用微信分享,需要满足以下几个条件。

  • 在微信中访问网页
  • 在微信公众号中申请认证
  • 配置域名ip白名单

分享配置

  1. 引入官方最新版分享js的sdk.

    <script src="http://res.wx.qq.com/open/js/jweixin-1.6.0.js"></script>
  2. 后台引入sdk,生成签名等信息。

    <?php
    
    class JSSDK {
      private $appId;
      private $appSecret;
      private $url;
      public function __construct($appId, $appSecret,$url) {
        $this->appId = $appId;
        $this->appSecret = $appSecret;
       $this->url = $url;
      }
    
      public function getSignPackage() {
        $jsapiTicket = $this->getJsApiTicket();
        $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
       // $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
       $url =$this->url;
        $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;
      }
    
      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;
      }
    
      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
        $data = json_decode(file_get_contents("jsapi_ticket.json"));
        if ($data->expire_time < time()) {
          $accessToken = $this->getAccessToken();
          // 如果是企业号用以下 URL 获取 ticket
          // $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=$accessToken";
          $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
          $res = json_decode($this->httpGet($url));
          $ticket = $res->ticket;
          if ($ticket) {
            $data->expire_time = time() + 7000;
            $data->jsapi_ticket = $ticket;
            $fp = fopen("jsapi_ticket.json", "w");
            fwrite($fp, json_encode($data));
            fclose($fp);
          }
        } else {
          $ticket = $data->jsapi_ticket;
        }
    
        return $ticket;
      }
    
      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
        $data = json_decode(file_get_contents("access_token.json"));
        if ($data->expire_time < time()) {
          // 如果是企业号用以下URL获取access_token
          // $url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=$this->appId&corpsecret=$this->appSecret";
          $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$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;
            $fp = fopen("access_token.json", "w");
            fwrite($fp, json_encode($data));
            fclose($fp);
          }
        } else {
          $access_token = $data->access_token;
        }
        return $access_token;
      }
    
      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;
      }
    }
      $url = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
    $jssdk = new JSSDK("公众号ID", "公众号密钥",$url);//按照自己的公众号填写
    $signPackage = $jssdk->GetSignPackage();
    $data=json_encode(array ('appId'=>$signPackage["appId"],'timestamp'=>$signPackage["timestamp"],'nonceStr'=>$signPackage["nonceStr"],'signature'=>$signPackage["signature"],'url'=>$signPackage["url"]));
    $this->assign('data',$data);
    exit;
    ?>
  3. 页面设置配置

    <script>
    wx.config({
         debug: true, // 开启调试模式,调用的所有api的返回值会在客户端alert出来,若要查看传入的参数,可以在pc端打开,参数信息会通过log打出,仅在pc端时才会打印
         appId: data.appId,
         timestamp: data.timestamp,
         nonceStr: data.nonceStr,
         signature: data.signature,
         jsApiList: [
             "onMenuShareTimeline", //分享给好友
             "onMenuShareAppMessage", //分享到朋友圈
             "onMenuShareQQ",  //分享到QQ
             "onMenuShareWeibo" //分享到微博
    ]
    });
    </script> 
  4. 设置分享配置

    <script>
    wx.ready(function (){
      var shareData = {
      title: '标题',
      desc: '简介',//这里请特别注意是要去除html
      link: '链接',
      imgUrl: '标题图'
      };
      wx.onMenuShareAppMessage(shareData);
      wx.onMenuShareTimeline(shareData);
      wx.onMenuShareQQ(shareData);
      wx.onMenuShareWeibo(shareData);
    });
    </script>

注意事项

  • 公众号需要认证
  • 静态页面需要使用ajax来动态获取签名等信息
  • 分享链接注意转义
  • 调试的时候开启debug
  • 注意js可能存在的报错

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