微信公众账号

需要一个认证的微信公众号，一定要确定认证

在登录微信公众平台https://mp.weixin.qq.com
在公众号设置–>功能设置，填写设置Js接口安全域名、网页授权域名、业务域名

开始做之前，网上有些文档，只是说要设置js接口安全域名，结果一直报错 40048,invalid url domain

说是域名不合法，最后查到一个文章说 最好把网页授权域名、业务域名跟js接口安全域名保持一致。

设置以后，不报错了。

服务器端php代码

获取签名等信息，必须通过服务器返回，不能在前端js生成

代码是在laravel框架中写的

路由

//获取微信分享config
Route::get('getWechatConfig', 'ApiWeChatController@getWechatConfig');

控制器

<?php


namespace App\Http\Controllers\Api;


use App\Extend\WeChat\JSSDK;

class ApiWeChatController extends ApiCommonController
{
    /**
     * 获取微信分享配置
     */
    public function getWechatConfig()
    {
        $url = request()->input('url');
        $jssdk = new JSSDK("开发者ID(AppID)", "开发者密码(AppSecret)");
        $return = $jssdk->GetSignPackage($url);
        $this->setReturn(1, '成功', $return);
    }
}

jssdk.php

<?php
namespace App\Extend\WeChat;

use Illuminate\Support\Facades\Cache;

class JSSDK
{
    private $appId;
    private $appSecret;

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

    public function getSignPackage($url)
    {
        $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
        $data = json_decode($this->get_php_file("jsapi_ticket"));
        if (empty($data)) {
            $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;
                $this->set_php_file("jsapi_ticket", json_encode($data));
            }
        } 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
        $data = json_decode($this->get_php_file("access_token.php"));
        if (empty($data)) {
            // 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;
                $this->set_php_file("access_token", json_encode($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。
        $debug = config('app.debug');
        if(!$debug) {
            curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
            curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
        }else{
            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;
    }

    private function get_php_file($filename)
    {
        return Cache::get($filename);
    }

    private function set_php_file($filename, $content)
    {
        Cache::put($filename, $content, 119);
    }
}

设置ip白名单 ip是自己的服务器ip

剩下的就交给前端来操作就可以了！