微信公众平台开发(107) 分享到朋友圈和发送给好友

<?php
class JSSDK {
  private $appId;
  private $appSecret;

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

  public function getSignPackage() {
    $jsapiTicket=$this->getJsApiTicket();

    // 注意 URL 一定要动态获取，不能 hardcode.
    $protocol=(!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !=='off' || $_SERVER['SERVER_PORT']==443) ? "https://" : "http://";
    $url="$protocol$_SERVER[HTTP_HOST]$_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=$nonceStr×tamp=$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;
  }
}