PHP实现微信小程序用户授权的工具类示例

事先准备工作

1.申请一个小程序，申请地址：
2.仔细阅读小程序的用户授权登陆官方文档：
3.仔细阅读微信用户数据解密的相关文档：
4.在小程序后台配置好相应的后端请求地址，路径是：开发---->开发设置，如图

5.小程序如果需要做多个小程序的打通，还需要在绑定到开发者账号下面， 如果不需要union_id请忽略

6.服务端准备一个用户授权的接口，假设接口链接为，此接口接受如下参数

• code：微信登陆接口返回的登陆凭证，用户获取session_key
• iv：微信小程序登陆接口返回的向量，用于数据解密
• encrypted_data : 微信获取用户信息接口的返回的用户加密数据，用于后端的接口解析
• signature加密数据

接口返回的数据如下

{
  "errcode": 200,
  "msg": "success",
  "data": {
    "uid": 34098,
    "unionid": "xxx",
  }
}

6.建表

1）用户表，其中比较重要的字段是union_id，因为我们是有多个小程序和公众号，因此使用这个来区分唯一的用户编号

drop table if exists `jz_wxa_user`;
create table `jz_wxa_user` (
 `id` int(10) unsigned not null auto_increment,
 `uid` bigint(18) default null,
 `openid` varchar(255) character set utf8 default null comment 'openid',
 `user_name` varchar(100) character set utf8mb4 default '',
 `nick_name` varchar(100) collate utf8mb4_unicode_ci default '' comment '用户昵称',
 `sex` enum('0','1') character set utf8 default '1' comment '性别',
 `avatar` varchar(255) character set utf8 default null comment '用户头像',
 `province` varchar(100) character set utf8 default null comment '省份',
 `city` varchar(100) character set utf8 default null comment '城市',
 `country` varchar(100) character set utf8 default null comment '国家',
 `wx_union_id` varchar(255) character set utf8 default null comment '公众平台的唯一id',
 `from_url` varchar(255) character set utf8 default null comment '来源url',
 `created_at` timestamp null default null,
 `updated_at` timestamp null default null,
 `from_appid` varchar(30) collate utf8mb4_unicode_ci default 'wx95fc895bebd3743b' comment '来源appid',
 `wx_header` varchar(150) collate utf8mb4_unicode_ci default '' comment '微信头像',
 `gh_openid` varchar(60) collate utf8mb4_unicode_ci default '' comment '微信公众号openid',
 `phone` varchar(30) character set utf8 default '' comment '手机号码',
 primary key (`id`),
 key `idx_uid_union_id` (`uid`,`wx_union_id`)
) engine=innodb auto_increment=1 default charset=utf8mb4 collate=utf8mb4_unicode_ci;

实现步骤

用户授权时序图

关键代码

小程序端

小程序端的获取用户信息流程

1）调用login方法获取code
2）调用getuserinfo方法获取用户的加密数据
3）调用后端的用户授权接口将用户信息保存到服务端
4）保存后端接口返回的uid和unionid到localstorage中，作为全局参数

获取用户的授权信息

getuid:function(cf){
  var that = this
  wx.login({
   success: function (ress) {
    var code = ress.code 
    wx.getuserinfo({ 
     withcredentials: true,     
     success: function (res) {
      that.globaldata.userinfo = res.userinfo;
      that.authorize(code, res.signature, res.iv, res.rawdata, res.encrypteddata, cf)
     }
    })
   }
  })
 },
 authorize: function (code, signature, iv, rawdata, encrypteddata, cf) {
  var that =this
  var dataobj = {
   code: code,
   signature: signature,
   iv: iv,
   raw_data: rawdata,
   encrypted_data: encrypteddata
  }
  console.log("code:",code)
  var param = json.stringify(dataobj)
  param = that.encrypt(param)
  var url = that.data.api_domain2 + "/user/authorization?param=" + param
  wx.request({
   url: url,
   method: "get",
   header: {
    'content-type': 'application/json'
   },
   success: function (res) {
    if (res.data.errcode == 200) {
     wx.hidetoast()    
     wx.setstorage({
      key: "uid",
      data: res.data.data.uid,
      success: function () {
       if (cf) {
        typeof cf == "function" && cf(res.data.data.uid)
       }
      }
     })
    } else {
     that.exceptionhandle('uid', url, res.data.errcode, res.data.msg)
    }
   }
  })
 },

服务端

入口方法

/**
   * api接口开发
   * 获取详情的接口
   * @param $uid 用户编号
   * @param $iv 向量
   * @param $encrypteddata 微信加密的数据
   * @param $rawdata 判断是否为今天
   * @param $signature 签名
   * @return array
   */
  public static function authorization($appid,$appsecret,$code,$iv,$encrypteddata,$rawdata,$signature){
    $result = self::decodewxdata($appid,$appsecret,$code,$iv,$encrypteddata);
    if($result['errcode'] != 200){
      return $result;
    }
    //处理微信授权的逻辑
    $wxuserdata = $result['data'];
    error_log("authorization data=============>");
    error_log(json_encode($wxuserdata));
    $uid = wxauserservice::regwxauser($wxuserdata);
    $data['uid'] = $uid['uid'];
    $data['unionid'] = $uid['unionid'];
    $result['data'] = $data;
    return $result;
  }
  
  /**
   * 解密微信的数据
   * @param $code wx.login接口返回的code
   * @param $iv wx.getuserinfo接口或者wx.getwerundata返回的iv
   * @param $encrypteddata wx.getuserinfo接口或者wx.getwerundata返回的加密数据
   * @return array
   */
  public static function decodewxdata($appid,$appsecret,$code,$iv,$encrypteddata){
    $sessionkeyurl = sprintf('%s?appid=%s&secret=%s&js_code=%s&grant_type=authorization_code',config('param.wxa_user_info_session_key_url'),$appid,$appsecret,$code);
    $rtnjson = curlrequest($sessionkeyurl);
    $data = json_decode($rtnjson,true);
    error_log('authorization wx return data========>');
    error_log($rtnjson);
    if(isset($data['errcode'])){
      return $data;
    }
    $sessionkey = $data['session_key'];
    $wxhelper = new wxbizdatahelper($appid,$sessionkey,$encrypteddata,$iv);
    $data['errcode'] = 200;
    $data['data'] = [];
    if(!$wxdata = $wxhelper->getdata()){
      $data['errcode'] = -1;
    }else{
      error_log('current wx return data is =========>'.json_encode($wxdata));
      $data['data'] = $wxdata;
    }
    return $data;
  }

保存用户信息的方法

 /**
   * 保存用户信息的方法
   * @param $wxauserdata
   * @param $regfromgh 表示是否从公众号进行注册
   */
  public function regwxauser($wxauserdata,$regfromgh = false)
  {
    $value = $wxauserdata['unionid'];
    $key = getcachekey('redis_key.cache_key.zset_list.lock') . $value;
    $newexpire = redishelper::getlock($key);
    $data = $this->storewxauser($wxauserdata,$regfromgh);
    redishelper::releaselock($key, $newexpire);
    return $data;
  }
  
  /**
   * 保存信息
   * @param $wxauserdata
   * @return mixed
   */
  public function storewxauser($wxauserdata,$regfromgh = false)
  {
    $wxunionid = $wxauserdata['unionid'];
    if (!$user = $this->getbywxunionid($wxunionid)) {
      $getaccountdatastarttime = time();
      //这里是因为需要统一账户获取uid，所以这个是用户中心的接口，如果没有这个流程，则直接使用数据
      if($accountdata = accountcenterhelper::regwxauser($wxauserdata)){
        $getaccountdataendtime = time();
        $accountregtime = $getaccountdataendtime - $getaccountdatastarttime;
        error_log("reg user spend time is ===================>" . $accountregtime);
        $user = [
          'uid' => $accountdata['uid'],
          'user_name' => $accountdata['user_name'],
          'nick_name' => $wxauserdata['nickname'],
          'sex' => $accountdata['sex'],
          'wx_union_id' => $accountdata['wx_union_id'],
          'avatar' => isset($accountdata['avatar'])?$accountdata['avatar']:"",
          'from_appid' => $accountdata['from_appid'],
          'province' => $wxauserdata['province'],
          'city' => $wxauserdata['city'],
          'country' => $wxauserdata['country'],
          'openid' => $wxauserdata['openid'],
          'wx_header' => isset($wxauserdata['avatarurl'])?$wxauserdata['avatarurl']:"",
          'gh_openid' => $regfromgh?$wxauserdata['openid']:"",
        ];
        error_log("insert data=============>" . json_encode($user));
        $user = $this->store($user);
        $regapiuserendtime = time();
        error_log(" reg api user spend time================>" . ($regapiuserendtime - $getaccountdataendtime));
        error_log(" after insert data=============>" . json_encode($user));
      }
    }else{
      if(!$user['wx_header']){
        $updatedata = [
          'id' => $user['id'],
          'uid' => $user['uid'],
          'wx_header' => $wxauserdata['avatarurl'],
        ];
        $this->update($updatedata);
      }
      //同步用户的openid
      if($wxauserdata['openid'] != $user['openid']){
        $updatedata = [
          'id' => $user['id'],
          'uid' => $user['uid'],
          'openid' => $wxauserdata['openid'],
        ];
        $this->update($updatedata);
      }
    }
    $data['uid'] = $user['uid'];
    $data['unionid'] = $wxunionid;
    return $data;
  }

根据unionid获取用户信息

  /**
   * 根据unionid获取用户信息
   */
  public function getbywxunionid($unionid)
  {
    $cachekey = getcachekey('redis_key.cache_key.wxa_user.info') . $unionid;
    $value = $this->remember($cachekey, function () use ($unionid) {
      $userinfo = wxauser::where('wx_union_id', $unionid)->first();
      $userinfo = $this->compactuserinfo($userinfo);
      return $userinfo;
    });
    return $value;
  }

wxbizdatahelper工具类

<?php
/**
 * created by phpstorm.
 * user: auser
 * time: 11:17
 */

namespace app\http\base\wx;


class wxbizdatahelper
{

  private $appid;
  private $seesionkey ;
  private $encrypteddata;
  private $iv;
  public function __construct($appid, $sessionkey,$encrypteddata, $iv)
  {
    $this->appid = $appid;
    $this->seesionkey = $sessionkey;
    $this->encrypteddata = $encrypteddata;
    $this->iv = $iv;
  }

  public function getdata(){
    $pc = new wxbizdatacrypt($this->appid, $this->seesionkey);
    $json = '';
    $errcode = $pc->decryptdata($this->encrypteddata, $this->iv, $json);
    $data = [];
    if ($errcode == 0) {
      $data = json_decode($json,true);
    }
    return $data;
  }


}

wxbizdatacrypt工具类

<?php
/**
 * created by phpstorm.
 * user: auser
 * time: 10:38
 */

namespace app\http\base\wx;

use app\http\base\wx\prpcrypt;
use app\http\base\wx\errorcode;
use app\http\base\wx\pkcs7encoder;
class wxbizdatacrypt
{

  private $appid;
  private $sessionkey;

  /**
   * 构造函数
   * @param $sessionkey string 用户在小程序登录后获取的会话密钥
   * @param $appid string 小程序的appid
   */
  public function __construct( $appid, $sessionkey)
  {
    $this->sessionkey = $sessionkey;
    $this->appid = $appid;
  }


  /**
   * 检验数据的真实性，并且获取解密后的明文.
   * @param $encrypteddata string 加密的用户数据
   * @param $iv string 与用户数据一同返回的初始向量
   * @param $data string 解密后的原文
   *
   * @return int 成功0，失败返回对应的错误码
   */
  public function decryptdata( $encrypteddata, $iv, &$data )
  {
    if (strlen($this->sessionkey) != 24) {
      return errorcode::$illegalaeskey;
    }
    $aeskey=base64_decode($this->sessionkey);


    if (strlen($iv) != 24) {
      return errorcode::$illegaliv;
    }
    $aesiv=base64_decode($iv);

    $aescipher=base64_decode($encrypteddata);

    $pc = new prpcrypt($aeskey);
    $result = $pc->decrypt($aescipher,$aesiv);

    if ($result[0] != 0) {
      return $result[0];
    }

    $dataobj=json_decode( $result[1] );
    if( $dataobj == null )
    {
      return errorcode::$illegalbuffer;
    }
    if( $dataobj->watermark->appid != $this->appid )
    {
      return errorcode::$illegalbuffer;
    }
    $data = $result[1];
    return errorcode::$ok;
  }

}

prpcrypt工具类

<?php
/**
 * created by phpstorm.
 * user: auser
 * time: 10:55
 */

namespace app\http\base\wx;

class prpcrypt
{
  public $key;

  public function __construct($key)
  {
    $this->key = $key;
  }

  /**
   * 对密文进行解密
   * @param string $aescipher 需要解密的密文
   * @param string $aesiv 解密的初始向量
   * @return string 解密得到的明文
   */
  public function decrypt($aescipher, $aesiv)
  {

    try {
      $module = mcrypt_module_open(mcrypt_rijndael_128, '', mcrypt_mode_cbc, '');
      mcrypt_generic_init($module, $this->key, $aesiv);
      //解密
      $decrypted = mdecrypt_generic($module, $aescipher);
      mcrypt_generic_deinit($module);
      mcrypt_module_close($module);
    } catch (exception $e) {
      return array(errorcode::$illegalbuffer, null);
    }


    try {
      $result = pkcs7encoder2::decode($decrypted);
    } catch (exception $e) {
      //print $e;
      return array(errorcode::$illegalbuffer, null);
    }
    return array(0, $result);
  }
}

errorcode状态代码类

<?php
/**
 * created by phpstorm.
 * user: auser
 * time: 10:33
 */

namespace app\http\base\wx;


class errorcode
{
  public static $ok = 0;
  public static $illegalaeskey = -41001;
  public static $illegaliv = -41002;
  public static $illegalbuffer = -41003;
  public static $decodebase64error = -41004;

}

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