微信公众平台开发:网页获取用户地理位置

  1 <?php
  2 class JSSDK {
  3 private $appId;
  4 private $appSecret;
  5  
  6 public function __construct($appId, $appSecret) {
  7     $this->appId = $appId;
  8     $this->appSecret = $appSecret;
  9 }
 10  
 11 public function getSignPackage() {
 12     $jsapiTicket = $this->getJsApiTicket();
 13      
 14     // 注意 URL 一定要动态获取，不能 hardcode.
 15     $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
 16     $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
 17      
 18     $timestamp = time();
 19     $nonceStr = $this->createNonceStr();
 20      
 21     // 这里参数的顺序要按照 key 值 ASCII 码升序排序
 22     $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";
 23      
 24     $signature = sha1($string);
 25      
 26     $signPackage = array(
 27         "appId" => $this->appId,
 28         "nonceStr" => $nonceStr,
 29         "timestamp" => $timestamp,
 30         "url" => $url,
 31         "signature" => $signature,
 32         "rawString" => $string
 33     );
 34     return $signPackage;
 35 }
 36  
 37 private function createNonceStr($length = 16) {
 38     $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
 39     $str = "";
 40     for ($i = 0; $i < $length; $i++) {
 41         $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
 42     }
 43     return $str;
 44 }
 45  
 46 private function getJsApiTicket() {
 47     // 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
 48     $data = json_decode(file_get_contents("jsapi_ticket.json"));
 49     if ($data->expire_time < time()) {
 50         $accessToken = $this->getAccessToken();
 51         // 如果是企业号用以下 URL 获取 ticket
 52         // $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=$accessToken";
 53         $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
 54         $res = json_decode($this->httpGet($url));
 55         $ticket = $res->ticket;
 56         if ($ticket) {
 57             $data->expire_time = time() + 7000;
 58             $data->jsapi_ticket = $ticket;
 59             $fp = fopen("jsapi_ticket.json", "w");
 60             fwrite($fp, json_encode($data));
 61             fclose($fp);
 62         }
 63     } else {
 64         $ticket = $data->jsapi_ticket;
 65     }
 66      
 67     return $ticket;
 68 }
 69  
 70 private function getAccessToken() {
 71     // 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
 72     $data = json_decode(file_get_contents("access_token.json"));
 73     if ($data->expire_time < time()) {
 74         // 如果是企业号用以下URL获取access_token
 75         // $url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=$this->appId&corpsecret=$this->appSecret";
 76         $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
 77         $res = json_decode($this->httpGet($url));
 78         $access_token = $res->access_token;
 79         if ($access_token) {
 80             $data->expire_time = time() + 7000;
 81             $data->access_token = $access_token;
 82             $fp = fopen("access_token.json", "w");
 83             fwrite($fp, json_encode($data));
 84             fclose($fp);
 85         }
 86     } else {
 87         $access_token = $data->access_token;
 88     }
 89     return $access_token;
 90 }
 91  
 92 private function httpGet($url) {
 93     $curl = curl_init();
 94     curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
 95     curl_setopt($curl, CURLOPT_TIMEOUT, 500);
 96     curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
 97     curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
 98     curl_setopt($curl, CURLOPT_URL, $url);
 99      
100     $res = curl_exec($curl);
101     curl_close($curl);
102      
103     return $res;
104 }
105 }