<?php
/**
 * 领取卡券同步微信卡包类
 * @Copyright (C) 2016 汉潮 All rights reserved.
 * @License http://www.hanchao9999.com
 * @Author xiaogg <xiaogg@sina.cn>
 */

namespace Common\Vendor;
class JSSDK {
  
  public function __construct($appId, $appSecret) {
	if(C('BOUND_STATUS')==2){//扫码授权
		$this->wx = new \Common\Vendor\Weixinopen;
		$this->appId = $this->wx->getappid();
	}else{
		$this->appId =C('WX_APPID');
        $this->appSecret = C('WX_APPSECRET');
	}
    if(empty($this->appId))return false;
    
  }

  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=$nonceStr&timestamp=$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
    $data = json_decode(session("jsapi_ticket.php"));
    if ($data->expire_time < time()) {
		if(C('BOUND_STATUS')==2){//扫码授权
			$accessToken = $this->wx->get_access_token(C('appid'));
		}else{
			$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 = $ticket;
			session("jsapi_ticket.php", json_encode($data));
		}
    } else {
      $ticket = $data->jsapi_ticket;
    }

    return $ticket;
  }
  public function getmedia($media_id,$filename=''){
        if(empty($filename))$filename=ROOT_PATH.'/uploads/thumb/'.$media_id.'.jpg';
        if(file_exists($filename))return $filename;
        if(getconfig('BOUND_STATUS')==2){//扫码授权
        	$accessToken = $this->wx->get_access_token(C('appid'));
        }else{
        	$accessToken = $this->getAccessToken();
        }
        $url = "https://api.weixin.qq.com/cgi-bin/media/get?access_token=".$accessToken."&media_id=".$media_id;     
        $result=file_get_contents($url);
        file_put_contents($filename,$result);
        return $filename;
  }
  public 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
    $data = json_decode(S("access_token.php"));
    if ($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 = $access_token;
        S("access_token.php", json_encode($data));
      }
    } else {
      $access_token = $data->access_token;
    }
    return $access_token;
  }

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

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

    return $res;
  }

  private function get_php_file($filename) {
    return trim(substr(file_get_contents($filename), 15));
  }
  private function set_php_file($filename, $content) {
    $fp = fopen($filename, "w");
    fwrite($fp, "<?php exit();?>" . $content);
    fclose($fp);
  }
}
?>