<?php
namespace Home\Model;
use Think\Model;
class WechatModel extends Model {
private $_token = ''; //令牌
    private $appid;
    private $appsecret;
  public function __construct()
  {
    $this->appid = C('APPID');//公众号的appid
    $this->appsecret = C('APPSECRET');//公众号的秘钥
  }
  //调用js-sdk的签名包
  public function getSignPackage() {
  $jsapiTicket = $this->getJsApiTicket();
  // 注意 URL 一定要动态获取，不能 hardcode.（获取当前网页的url）
  $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
  $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
  //时间戳
  $timestamp = time();
  //随机字符串获取
  $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=$url";
  //生成字符串是用来签名用的
  $signature = sha1($string);
  $signPackage = array(
   "appId"   => $this->appid,
   "nonceStr" => $nonceStr,
   "timestamp" => $timestamp,
   "url"    => $url,
   "signature" => $signature,
   "rawString" => $string
  );
  return $signPackage; 
 }
 //使用会员卡领取的签名包
 public function getHuiYuanSignPackage() {
  $apiTicket = $this->getApiTicket();
  // 注意 URL 一定要动态获取，不能 hardcode.（获取当前网页的url）
  $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
  $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";
  //时间戳
  $timestamp = time();
  //随机字符串获取
  // $nonceStr = $this->createNonceStr();
  // 这里参数的顺序要按照 key 值 ASCII 码升序排序
  $string = $timestamp.$apiTicket."car_id";//card_id为自己创建的会员卡的id
  //生成字符串是用来签名用的
  $signature = sha1($string);
  $signPackage = array(
   "timestamp" => $timestamp,
   "signature" => $signature,
  );
  return $signPackage; 
 }
 //获取会员卡的api_ticket
 public function getApiTicket(){
 $data = json_decode(file_get_contents("api_ticket.json"));
  if ($data->expire_time < time()) {
   $accessToken = $this->getAccessToken();
   $url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=wx_card&access_token=$accessToken";
   $res = json_decode($this->httpGet($url));
   $ticket = $res->ticket;
   if ($ticket) {
    $data->expire_time = time() + 7000;
    $data->jsapi_ticket = $ticket;
    $fp = fopen("api_ticket.json", "w");
    fwrite($fp, json_encode($data));
    fclose($fp);
   }
  } else {
   $ticket = $data->jsapi_ticket;
  }
  return $ticket;
 }
 //获取随机字符串
 private function createNonceStr($length = 16) {
  $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
  $str = "";
  for ($i = 0; $i < $length; $i++) {
   $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
  }
  return $str;
 }
  //获取Access Token
  public function getAccessToken(){
  //将json字符串转换为json对象（json_encode是将数组转换为json字符串，json_decode("",true) 如果加true是将json字符串转化为php数组，不加true转换为PHP对象）
  $data = json_decode(file_get_contents("access_token.json"));
  if ($data->expire_time < time()) {
   // 如果是企业号用以下URL获取access_token
   $url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appid&secret=$this->appsecret";
   $res = json_decode($this->httpGet($url));
   $access_token = $res->access_token;
 if ($access_token) {
    $data->expire_time = time() + 7000;
    $data->access_token = $access_token;
    $fp = fopen("access_token.json", "w");
    fwrite($fp, json_encode($data));
    fclose($fp);
 }
  } else {
   $access_token = $data->access_token;
  }
  return $access_token;
  }
 //获取jsapi_ticket(jsapi_ticket是公众号用于调用微信JS接口的临时票据)
  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
  $data = json_decode(file_get_contents("jsapi_ticket.json"));
  if ($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;
    $fp = fopen("jsapi_ticket.json", "w");
    fwrite($fp, json_encode($data));
    fclose($fp);
   }
  } else {
   $ticket = $data->jsapi_ticket;
  }
  return $ticket;
 }
  //获取用户的openid
  public function openId(){
  $url = $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI']; 
    if (!isset($_GET['code'])) {
     //获取组装的url
      $openidUrl = $this->snsapi_base($url);
      redirect($openidUrl);
    }else{
      $openidAccess_token = $this->openidAccess_token($_GET['code']);
      return $openidAccess_token;
    }
  }
   //获取微信用户的opnid
  public function getOpenId($openid,$access_token)
  {
    $userInfo = $this->getUserInfo($openid,$access_token);
    return $userInfo;
  }
   public function snsapi_base($redirect_uri, $scope = "snsapi_userinfo", $state = 0)
  {
    $appId = $this->appid;
    $url = "https://open.weixin.qq.com/connect/oauth2/authorize";
    $url .= "?appid=$appId";
    $url .= "&redirect_uri=http://$redirect_uri";
    $url .= "&response_type=code";
    $url .= "&scope=$scope";
    $url .= "&state=$state#wechat_redirect";
    return $url;
  }
public function openidAccess_token($code){
    $appId = $this->appid;
    $appSecret= $this->appsecret;
    $url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=$appId&secret=$appSecret&code=$code&grant_type=authorization_code";
    return json_decode($this->httpGet($url),true);
  }
  //获取用户信息
  public function getUserInfo($openid, $access_token){
  $url = "https://api.weixin.qq.com/sns/userinfo?access_token=$access_token&openid=$openid&lang=zh_CN ";
    return json_decode($this->httpGet($url),true);
   //请求
  }
private function httpGet($url) {
  $curl = curl_init();
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($curl, CURLOPT_TIMEOUT, 500);
  curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
  curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false);
  curl_setopt($curl, CURLOPT_URL, $url);
  $res = curl_exec($curl);
  curl_close($curl);
  return $res;
 }
}