<?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;
        // 微信的判斷是否關(guān)注的接口有時(shí)候會(huì)抽風(fēng)，所以要多試幾次
        $url = 'https://api.weixin.qq.com/cgi-bin/user/info?access_token='.$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);
        // 最終微信接口還是失敗了（暫時(shí)查不出什么原因。。），那就只能默認(rèn)返回的是已關(guān)注的結(jié)果了，代價(jià)是下次進(jìn)入時(shí)，可能會(huì)提示需要關(guān)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($curl, CURLOPT_TIMEOUT, 500);
        // 為保證第三方服務(wù)器與微信服務(wù)器之間數(shù)據(jù)傳輸?shù)陌踩?，所有微信接口采用https方式調(diào)用，必須使用下面2行代碼打開ssl安全校驗(yàn)。
        // 如果在部署過程中代碼在此處驗(yàn)證失敗，請(qǐng)到 http://curl.haxx.se/ca/cacert.pem 下載新的證書判別文件。
        curl_setopt($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;
    }
}