Detailed explanation of login example of WeChat applet (with code)

This article mainly introduces relevant information about the detailed explanation of WeChat Mini Program login examples. Friends in need can refer to

WeChat Mini Program Login

## 1. The applet does not support cookiesession

1. Maintain the session by passing and checking 3rd_

session 2. 3rd_session can Execute '`head

-n 80 /dev/urandom | tr -dc A-Za-z0-9 | head -c 168`This command generates

　3. Use Redis

Or database storage session

　4. The generated 3rd_session is sent to the client and written into storage

　5. Each request of the client must bring 3rd_session

2. Decoding encrypted data

1. $iv, $code is encrypted data. Since the + sign becomes a space due to encoding during the request process, we need to use the following Method to convert back

　

function define_str_replace($data){
    return str_replace(' ','+',$data);
  }

3. Example:

php

  // 微信登录
  public function weixin_login(){
    $session_db=D('Session');
    $session_id=I('get.sessionid','');
    $session=$session_db->getSession($session_id);
    if( !empty( $session ) ){
      $this->ajaxReturn(['error_code'=>0,'sessionid'=>$session_id]);
    }else{
      $iv=define_str_replace(I('get.iv')); //把空格转成+
      $encryptedData=urldecode(I('get.encryptedData'));  //解码
      $code=define_str_replace(I('get.code')); //把空格转成+
      $msg=D('Weixin')->getUserInfo($code,$encryptedData,$iv); //获取微信用户信息（openid）
      if($msg['errCode']==0){
        $open_id=$msg['data']->openId;
        $users_db=D('Users');
        $info=$users_db->getUserInfo($open_id);
        if(!$info||empty($info)){
          $users_db->addUser(['open_id'=>$open_id,'last_time'=>['exp','now()']]); //用户信息入库
          $info=$users_db->getUserInfo($open_id);                  //获取用户信息
          $session_id=`head -n 80 /dev/urandom | tr -dc A-Za-z0-9 | head -c 168`;  //生成3rd_session
          $session_db->addSession(['uid'=>$info['id'],'id'=>$session_id]); //保存session
        }
        if($session_id){
          $this->ajaxReturn(['error_code'=>0,'sessionid'=>$session_id]);  //把3rd_session返回给客户端
        }else{
          $this->ajaxReturn(['error_code'=>0,'sessionid'=>$session_db->getSid($info['id'])]);
        }
        
      }else{
        $this->ajaxReturn(['error_code'=>'用户信息获取失败！']);
      }
      
    }
  }

Get WeChat information

Model

(including information decryption, official Click to download the example)

require_once ABS_APP_PATH.'/Addon/Aes/wxBizDataCrypt.php';
class WeixinModel{
  // 获取微信的用户信息（openid）
  public function getUserInfo($code,$encryptedData,$iv){
    $appid=C('appid');
    $secret=C('secret');
    $grant_type='authorization_code';
    $url='https://api.weixin.qq.com/sns/jscode2session';
    $url= sprintf("%s?appid=%s&secret=%s&js_code=%s&grant_type=%",$url,$appid,$secret,$code,$grant_type);
    $user_data=json_decode(file_get_contents($url));
    $session_key= define_str_replace($user_data->session_key);
    $data="";
    $wxBizDataCrypt=new \WXBizDataCrypt($appid,$session_key);
    $errCode=$wxBizDataCrypt->decryptData($encryptedData,$iv,$data);
    return ['errCode'=>$errCode,'data'=>json_decode($data),'session_key'=>$session_key];
  }
  }

javascript

  getUserInfo: function(cb) {
    var that = this
    if (this.globalData.userInfo) {
      typeof cb == "function" && cb(this.globalData.userInfo)
    } else {
      //调用登录接口
      wx.login({
        success: function(r) {
          wx.getUserInfo({
            success: function(res) {
              that.login({
                code: r.code,
                iv: res.iv,
                encryptedData: encodeURIComponent(res.encryptedData),
              })
              that.globalData.userInfo = res.userInfo
              typeof cb == "function" && cb(that.globalData.userInfo)
            }
          })
        }
      })
    }
  },
  login: function(param) {
    wx.request({
      url: this.requestUrl('Index/weixin_login'),
      data: param,
      header: {
        'content-type': "application/json",
      },
      success: function(res) {
        var data = JSON.parse(res.data.trim());
        wx.setStorageSync('sessionid', data.sessionid);
      }
    })
  },

Thank you for reading, I hope it can help everyone, thank you for your support of this site!

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