微信接口调用 b0a2

1.有appid,appsecret和微信调用网址URL

2.php先通过appid和appsecret向获取token网址请求token

3.用token向获取ticket网址请求ticket

4.将已获得的数据照微信规范处理后发送到URL，获取signpackage

5.由于token和ticket有请求次数限制和过期时间，所以应在本地缓存这两个数据，过期后再重新获取

getSign.php

<?php
header("Access-Control-Allow-Origin: *");
require_once "jssdk.php";
$url = $_POST['url'];
$jssdk = new JSSDK("XXX", "XXX",$url);
$signPackage = $jssdk->GetSignPackage();
$signPackage=json_encode($signPackage);
echo $signPackage;
?>

jssdk.php

<?php
class JSSDK {
private $appId;
private $appSecret;
private $url;

public function __construct($appId, $appSecret ,$url) {
$this->appId = $appId;
$this->appSecret = $appSecret;
$this->url = $url;
}

public function getSignPackage() {
$jsapiTicket = $this->getJsApiTicket();

// 注意 URL 一定要动态获取，不能 hardcode.

if(!$this->url){
$protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
$this->url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

}

$timestamp = time();
$nonceStr = $this->createNonceStr();

// 这里参数的顺序要按照 key 值 ASCII 码升序排序
$string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr×tamp=$timestamp&url=".$this->url;

$signature = sha1($string);

$signPackage = array(
"appId"     => $this->appId,
"nonceStr"  => $nonceStr,
"timestamp" => $timestamp,
//      "url"       => $this->url,
"signature" => $signature,
//      "rawString" => $string
);
return $signPackage;
}

private function createNonceStr($length = 16) {
$chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
$str = "";
for ($i = 0; $i < $length; $i++) {
$str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
}
return $str;
}

private function getJsApiTicket() {
// jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
$data = json_decode($this->get_php_file("jsapi_ticket.php"));
if ($data->expire_time < time()) {
$accessToken = $this->getAccessToken();
// 如果是企业号用以下 URL 获取 ticket
// $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=$accessToken";
$url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
$res = json_decode($this->httpGet($url));
$ticket = $res->ticket;
if ($ticket) {
$data->expire_time = time() + 7000;
$data->jsapi_ticket = $ticket;
$this->set_php_file("jsapi_ticket.php", json_encode($data));
}
} else {
$ticket = $data->jsapi_ticket;
}

return $ticket;
}

private function getAccessToken() {
// access_token 应该全局存储与更新，以下代码以写入到文件中做示例
$data = json_decode($this->get_php_file("access_token.php"));
if ($data->expire_time < time()) {
// 如果是企业号用以下URL获取access_token
// $url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=$this->appId&corpsecret=$this->appSecret";
$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
$res = json_decode($this->httpGet($url));
$access_token = $res->access_token;
//	  echo $access_token."<br/>";
if ($access_token) {
$data->expire_time = time() + 7000;
$data->access_token = $access_token;
$this->set_php_file("access_token.php", json_encode($data));
}
} else {
$access_token = $data->access_token;
}
return $access_token;
}

private function httpGet($url) {
$curl = curl_init();
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_TIMEOUT, 500);
// 为保证第三方服务器与微信服务器之间数据传输的安全性，所有微信接口采用https方式调用，必须使用下面2行代码打开ssl安全校验。
// 如果在部署过程中代码在此处验证失败，请到 http://curl.haxx.se/ca/cacert.pem 下载新的证书判别文件。
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, true);
curl_setopt($curl, CURLOPT_URL, $url);

$res = curl_exec($curl);
curl_close($curl);

return $res;
}

private function get_php_file($filename) {
echo trim(substr(file_get_contents($filename), 15));
return trim(substr(file_get_contents($filename), 15));

}
private function set_php_file($filename, $content) {
echo "writing in";
$fp = fopen($filename, "w");
fwrite($fp, "<?php exit();?>" . $content);
fclose($fp);
}
}

access_token.php

<?php exit();?>
{"access_token":"","expire_time":0}

jsapi_ticket.php

<?php exit();?>
{"jsapi_ticket":"","expire_time":0}