/**
* 公众号用于调用微信JS接口的临时票据
*
* http://mp.weixin.qq.com/wiki/7/aaa137b55fb2e0456bf8dd9148dd613f.html#.E9.99.84.E5.BD.951-JS-SDK.E4.BD.BF.E7.94.A8.E6.9D.83.E9.99.90.E7.AD.BE.E5.90.8D.E7.AE.97.E6.B3.95
* jsapi_ticket 的type为jsapi (腾讯demo中的JSSDK.php代码中type为1 不知为何)
* 卡券 api_ticket 的type为 wx_card
*
* @param string $type
* @return string
*/
public static function getJsApiTicket($type = 'jsapi')
{
$cacheKey = parent::getApi()->getAppId() . $type . 'jsapi_ticket';
$ticket = Cache::get($cacheKey);
if ($ticket !== false) {
return $ticket;
}
$url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type={$type}&access_token=ACCESS_TOKEN";
$data = parent::request($url);
$ticket = $data['ticket'];
//jsapi_ticket的有效期为7200秒
Cache::set($cacheKey, $ticket, $data['expires_in'] - 200);
return $ticket;
}
/**
* 获取公众号的全局唯一票据accessToken，公众号主动调用各接口时都需使用accessToken
* accessToken默认有效时间为7200秒，每天调用次数有限制，认证服务号每天最多100000次
*
* @param bool $useCache 是否使用缓存
* @return string|null
*/
public function getAccessToken($useCache = true)
{
//缓存key
$cacheKey = md5(__FILE__ . __METHOD__ . $this->appId);
//检查是否启用缓存
if ($useCache) {
if (empty($this->accessToken)) {
$this->accessToken = Cache::get($cacheKey);
}
if (!empty($this->accessToken)) {
return $this->accessToken;
}
} else {
$this->accessToken = null;
Cache::delete($cacheKey);
}
//获取accessToken
$url = 'https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=%s&secret=%s';
$response = Curl::get(sprintf($url, $this->appId, $this->appSecret));
//返回格式 {"access_token":"ACCESS_TOKEN","expires_in":7200}
//{"access_token":"43BKbLBjBnwH600H5TMSlx6AKT9TCZ3BRXjxvT0erRpzHTIaUuaJBDUoUykTqA","expires_in":7200}
//每日调用超过次数，将提示
//{"errcode":45009,"errmsg":"reach max api daily quota limit hint: [PuguNA0618vr22]"}
$arr = Json::parseOrFail($response);
$this->accessToken = $arr['access_token'];
//默认时间是7200秒(120分钟)
$expires = $arr['expires_in'] - 1200;
if ($expires > 0) {
Cache::set($cacheKey, $this->accessToken, $expires);
}
return $this->accessToken;
}