微信小程序 登录实例详解

// 微信登录

publicfunctionweixin_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！']);

    }

  }

}

require_once ABS_APP_PATH.'/Addon/Aes/wxBizDataCrypt.php'

class WeixinModel{

  // 获取微信的用户信息（openid）

  publicfunctiongetUserInfo($code,$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];

  }

  }

getUserInfo:function(cb) {

  varthat =this

  if(this.globalData.userInfo) {

    typeofcb =="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

            typeofcb =="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) {

      vardata = JSON.parse(res.data.trim());

      wx.setStorageSync('sessionid', data.sessionid);

    }

  })

},