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use Think\Cache;
class WeChat
{
// 你的 appid
private $appId = '';
// 秘钥
private $appSecret = '';
// 获取 token 的 url
private $getAccessTokenUrl = 'https://api.weixin.qq.com/cgi-bin/token';
// 获取 jsticket 的 url
private $getJsTicketUrl = 'https://api.weixin.qq.com/cgi-bin/ticket/getticket';
private $cacheLiefTime = 3600;
private $cacheKey = 'ticket';
/**
* 获取签名
*
* @time at 2018年12月10日
* @param $url
* @return array
*/
public function getSignature($url)
{
$nonceStr = $this->createNonceStr(18);
$timeStamp = time();
$params = [
'jsapi_ticket' => $this->getJsTicket(),
'noncestr' => $nonceStr,
'timestamp' => $timeStamp,
];
// 只有唯一的注意点，就是不要把 url 放在 http_build_query 函数里面，它会转义
// 验证你的签名请到这里 http://mp.weixin.qq.com/debug/cgi-bin/sandbox?t=jsapisign
$signature = sha1(http_build_query($params) . '&url=' . $url);
return ['noncestr' => $nonceStr, 'timestamp' => $timeStamp, 'signature' => $signature, 'appid' => $this->appId];
}
/**
* 获取 TOKEN
*
* @time at 2018年12月10日
* @return void
*/
private function getAccessToken()
{
$params = [
'grant_type' => 'client_credential',
'appid' => $this->appId,
'secret' => $this->appSecret,
];
$res = $this->httpGet($this->getAccessTokenUrl .'?'.http_build_query($params));
$res = json_decode($res, true);
if (isset($res['errcode'])) {
return false;
}
return $res['access_token'];
}
/**
* 获取签名
*
* @time at 2018年12月10日
* @return void
*/
private function getJsTicket()
{
$ticket = cache($this->cacheKey);
if ($ticket) {
return $ticket;
}
$accessToken = $this->getAccessToken();
$params = [
'access_token' => $accessToken,
'type' => 'jsapi',
];
if (!$accessToken) {
return false;
}
$res = $this->httpGet($this->getJsTicketUrl .'?'.http_build_query($params));
$res = json_decode($res, true);
if (isset($res['errcode']) && $res['errcode']) {
return false;
}
Cache::remember($this->cacheKey, $res['ticket'], $this->cacheLiefTime);
return $res['ticket'];
}
private function httpGet($url)
{
$curl = curl_init();
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_TIMEOUT, 500);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($curl, CURLOPT_URL, $url);
$res = curl_exec($curl);
curl_close($curl);
return $res;
}
private function createNonceStr($n)
{
if (!is_numeric($n)) {
return false;
}
$str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
$nonceStr = '';
$strLen = strlen($str);
for ($i = 1; $i < intval($n); $i++) {
$nonceStr .= $str[rand(0, $strLen-1)];
}
return $nonceStr;
}
}
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