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AccessToken.php
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AccessToken.php
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<?php
/*
* This file is part of the overtrue/wechat.
*
* (c) overtrue <i@overtrue.me>
*
* This source file is subject to the MIT license that is bundled
* with this source code in the file LICENSE.
*/
/**
* AccessToken.php.
*
* Part of Overtrue\Wechat.
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*
* @author overtrue <i@overtrue.me>
* @copyright 2015 overtrue <i@overtrue.me>
*
* @link https://github.com/overtrue
* @link http://overtrue.me
*/
namespace Overtrue\Wechat;
/**
* 全局通用 AccessToken.
*/
class AccessToken
{
/**
* 应用ID.
*
* @var string
*/
protected $appId;
/**
* 应用secret.
*
* @var string
*/
protected $appSecret;
/**
* 缓存类.
*
* @var Cache
*/
protected $cache;
/**
* 缓存前缀
*
* @var string
*/
protected $cacheKey = 'overtrue.wechat.access_token';
// API
const API_TOKEN_GET = 'https://api.weixin.qq.com/cgi-bin/token';
/**
* constructor.
*
* @param string $appId
* @param string $appSecret
*/
public function __construct($appId, $appSecret)
{
$this->appId = $appId;
$this->appSecret = $appSecret;
$this->cacheKey = $this->cacheKey.'.'.$appId;
$this->cache = new Cache($appId);
}
/**
* 缓存 setter.
*
* @param Cache $cache
*/
public function setCache($cache)
{
$this->cache = $cache;
}
/**
* 获取Token.
*
* @param bool $forceRefresh
*
* @return string
*/
public function getToken($forceRefresh = false)
{
$cacheKey = $this->cacheKey;
$cached = $this->cache->get($cacheKey);
if ($forceRefresh || empty($cached)) {
$token = $this->getTokenFromServer();
$this->cache->set($cacheKey, $token['access_token'], $token['expires_in'] - 800);
return $token['access_token'];
}
return $cached;
}
/**
* Get the access token from WeChat server.
*
* @param string $cacheKey
*
* @return array|bool
*/
protected function getTokenFromServer()
{
$http = new Http();
$params = array(
'appid' => $this->appId,
'secret' => $this->appSecret,
'grant_type' => 'client_credential',
);
$token = $http->get(self::API_TOKEN_GET, $params);
return $token;
}
}