onepage/tm/lib/Controller/Login.class.php

<?php
namespace Cas\Controller;

use KIF\Core\Config;

/**
 * 
 * Login
 * @author rabin
 *
 */
class Login extends Controller{
    
    private $appId;
    private $appSecret;
    
    public function __construct() {
        $wechat_cfg = Config::getInstance()->get('wechat_cfg');
        $this->appSecret = $wechat_cfg['appSecret'];
        $this->appId = $wechat_cfg['appId'];

        $this->objMemcached = new Memcached();
        $this->refer = 'accessTokenRefer';
    }

    public function doGet() {
        $refer = Request::g ( 'referer' );

        $this->objMemcached->set($this->refer, $refer);

        $host = Config::getInstance ()->get ( 'App_Id' );
        $callback = urlencode($host . '?c=Login&a=Callback');

        $time = time() . rand(0,100);
        $url = 'https://open.weixin.qq.com/connect/qrconnect';
        $url = 'https://open.weixin.qq.com/connect/oauth2/authorize';
        $url .= '?appid='.$this->appId.'&redirect_uri='.$callback.'&response_type=code&scope=snsapi_login&state='.$time.'#wechat_redirect';
        
        //echo $url;die;
        //self::redirect($url);

        header ( "Location: " . $url);
    }

    public function doCallback() {
        $code = Request::g ( 'code' );
        $url = 'https://api.weixin.qq.com/sns/oauth2/access_token?appid='.$this->appId.'&secret='.$this->appSecret.'&code='.$code.'&grant_type=authorization_code';

        $data = $this->httpGet($url);
        $data = json_decode($data, true);

        if (isset($data['access_token']) && $data['access_token']) {
            $url = 'https://api.weixin.qq.com/sns/userinfo?access_token=' . $data['access_token'] . '&openid=' . $data['openid'] . '&lang=zh_CN';

            $data = $this->httpGet($url);

            $data = json_decode($data, true);

            $refer = $this->objMemcached->get($this->refer);

            $param = $data;
            $param['uid'] = $data['openid'];
            $refer .= '&' . http_build_url($param);

            header ( "Location: " . $refer);
        }
    }

    private function httpGet($url) {
        $curl = curl_init();
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_TIMEOUT, 500);
        curl_setopt($curl, CURLOPT_URL, $url);
        $res = curl_exec($curl);
        curl_close($curl);
        return $res;
    }
}