<?php
namespace app\api\controller;

class Wx extends Base{
    const APPID = 'APPID';
    const APP_SECRET = 'APP_SECRET';

    public function get_openid(){
        if (!isset($this->post['js_code'])) {
            return json(['code' => 1, 'msg' => 'js_code必填']);
        }
        $res = $this->httpGet('https://api.weixin.qq.com/sns/jscode2session?appid='.self::APPID.'&secret='.self::APP_SECRET.'&js_code='.$this->post['js_code'].'&grant_type=authorization_code');
        return json(['code' => '0000', 'msg' => '成功', 'data' => json_decode($res,true)]);
    }

    private function get_access_token() {
        $access_token = cache('wx_access_token_'.self::APPID);
        if ($access_token) {
            return $access_token;
        }
        $res = $this->httpGet('https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid='.self::APPID.'&secret='.self::APP_SECRET);
        $data = json_decode($res, true);
        if (isset($data['access_token'])) {
            cache('wx_access_token_'.self::APPID, $data['access_token'], $data['expires_in']);
            return $data['access_token'];
        }
        exit(__LINE__.':'.$res);
    }

    public function get_userinfo() {
        if (!isset($this->post['openid'])) {
            return json(['code' => 1, 'msg' => 'openid必填']);
        }
        $maxTry = 10;
        // 微信的判断是否关注的接口有时候会抽风，所以要多试几次
        $url = 'https://api.weixin.qq.com/cgi-bin/user/info?access_token='.$this->get_access_token().'&openid='.$this->post['openid'].'&lang=zh_CN';
        for ($i=0; $i < $maxTry; $i++) { 
            $tmpres = $this->httpGet($url);
            $res = json_decode($tmpres, true);
            if (isset($res['subscribe'])) {
                return $res;
            }
            usleep(100*1000);
        }
        file_put_contents('lee.txt', '[error]:'.$tmpres, FILE_APPEND);
        // 最终微信接口还是失败了（暂时查不出什么原因。。），那就只能默认返回的是已关注的结果了，代价是下次进入时，可能会提示需要关注
        $data = [
            'subscribe' => 1,
            'openid' => $this->post['openid'],
            'nickname' => '',
            'sex' => 0,
            'province' => '',
            'city' => '',
            'country' => '',
            'headimgurl' => '',
        ];
        return json(['code' => '0000', 'msg' => '成功', 'data' => $data]);
    }

    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($curl, CURLOPT_SSL_VERIFYHOST, 1);
        curl_setopt($curl, CURLOPT_URL, $url);

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

        return $res;
    }
}