<?php
namespace wx\offiaccount;


use wx\Base;

class JsSdk extends Base
{
    public function getSignPackage($jsapiTicket, $url=null) {
        // 注意 URL 一定要动态获取，不能 hardcode.
        //$protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
        $protocol =  "https://"; //负载均衡情况下 后端监听80，业务服务器默认http头，但是此处要强制使用https头
        if(empty($url)){
            $url = "$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(
            "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;
    }

    /**
     * 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
     * @param $token
     * @return mixed
     */
    public function getJsApiTicket($token) {
        // 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";
        $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$token";
        $res = json_decode(curl($url));
        if($res->errcode != 0) trace($res->errmsg, 'error');
        $ticket = $res->ticket;

        return $ticket;
    }
}