A case study on how Thinkphp5 implements WeChat applet's user information interface

<?php 
/** 
 * Created by PhpStorm. 
 * User: leeoo 
 * Date: 2017/9/14 0014 
 * Time: 10:43 
 */ 
 
namespace app\api\controller\v1; 
 
 
use think\Loader; 
use think\Request; 
use Workerman\Protocols\Http; 
use Wxxcx\WXBizDataCrypt; 
use first\second\Foo; 
 
class Index 
{ 
  public function index($id) 
  { 
 
    return json([&#39;msg&#39; => $id]); 
  } 
 
  public function dologin() 
  { 
    $code = Request::instance()->param(&#39;code&#39;); 
    $encryptedData = Request::instance()->param(&#39;encryptedData&#39;); 
    $iv = Request::instance()->param(&#39;iv&#39;); 
 
    $appid = "你的小程序appid"; 
    $secret = "你的小程序secret"; 
    //appid={$appid}&secret={$secret}&js_code={$code}&grant_type=authorization_code 
    $param = array( 
      &#39;appid&#39; => $appid, 
      &#39;secret&#39; => $secret, 
      &#39;js_code&#39; => $code, 
      &#39;grant_type&#39; => &#39;authorization_code&#39; 
    ); 
  //http函数为封装的请求函数 
    $res = http("https://api.weixin.qq.com/sns/jscode2session", $param, &#39;post&#39;); 
 
    $arr = json_decode($res, true); 
 
    $result = $this->wxdecode($encryptedData, $iv, $arr[&#39;session_key&#39;], $appid); 
 
    //return json($result); 
    if ($result) { 
      return json([&#39;code&#39; => 1]); 
    } else { 
      return json([&#39;code&#39; => -1]); 
    } 
 
  } 
 
  public function wxdecode($encryptedData, $iv, $sessionKey, $appid) 
  { 
    //Loader::import(&#39;Wxxcx\WXBizDataCrypt&#39;, EXTEND_PATH); 
    $pc = new WXBizDataCrypt($appid, $sessionKey); 
    $data = null; 
    $errCode = $pc->decryptData($encryptedData, $iv, $data); 
    //echo $data; 
    //return json([&#39;data&#39;=>$data]); 
    $data = json_decode($data); 
 
    if ($errCode == 0) { 
      //print($data . "\n"); 
      //dump($data); 
      return $data; 
    } else { 
      //print($errCode . "\n"); 
      //dump($errCode); 
      return $errCode; 
    } 
 
  } 
}

/** 
 * 发送HTTP请求方法 
 * @param string $url  请求URL 
 * @param array $params 请求参数 
 * @param string $method 请求方法GET/POST 
 * @return array $data  响应数据 
 */ 
function http($url, $params, $method = 'GET', $header = array(), $multi = false){ 
  $opts = array( 
    CURLOPT_TIMEOUT    => 30, 
    CURLOPT_RETURNTRANSFER => 1, 
    CURLOPT_SSL_VERIFYPEER => false, 
    CURLOPT_SSL_VERIFYHOST => false, 
    CURLOPT_HTTPHEADER   => $header 
  ); 
  /* 根据请求类型设置特定参数 */ 
  switch(strtoupper($method)){ 
    case 'GET': 
      $opts[CURLOPT_URL] = $url . '?' . http_build_query($params); 
      break; 
    case 'POST': 
      //判断是否传输文件 
      $params = $multi ? $params : http_build_query($params); 
      $opts[CURLOPT_URL] = $url; 
      $opts[CURLOPT_POST] = 1; 
      $opts[CURLOPT_POSTFIELDS] = $params; 
      break; 
    default: 
      throw new Exception('不支持的请求方式！'); 
  } 
  /* 初始化并执行curl请求 */ 
  $ch = curl_init(); 
  curl_setopt_array($ch, $opts); 
  $data = curl_exec($ch); 
  $error = curl_error($ch); 
  curl_close($ch); 
  if($error) throw new Exception('请求发生错误：' . $error); 
  return $data; 
}

// 获取用户信息 
  wx.getSetting({ 
   success: res => { 
    if (res.authSetting['scope.userInfo']) { 
     // 已经授权，可以直接调用 getUserInfo 获取头像昵称，不会弹框 
     wx.getUserInfo({ 
      success: res => { 
       console.log(res); 
       var encryptedData = res.encryptedData 
       var iv = res.iv 
       wx.request({ 
        url: "https://你的服务器地址/dologin",//dologin是访问后端的方法 
        method: "post", 
        data: { 
         code: code, 
         encryptedData: encryptedData, 
         iv: iv 
        }, 
        success: function (ret) { 
         console.log(ret); 
        } 
       }) 
        
        
       // 可以将 res 发送给后台解码出 unionId 
       this.globalData.userInfo = res.userInfo 
 
       // 由于 getUserInfo 是网络请求，可能会在 Page.onLoad 之后才返回 
       // 所以此处加入 callback 以防止这种情况 
       if (this.userInfoReadyCallback) { 
        this.userInfoReadyCallback(res) 
       } 
      } 
     }) 
    } 
   } 
  }) 
 },