微信小程序 用户登录和维护的实例 以及手机号码授权

首先，小程序的登录流程图是这样的

 项目登录流程思路：

第一步：获取openid（在之前的文章写了，这里不再复述）

第二步 : 与数据库中的openid对比，如果存在openid表示已经授权登录过了。直接返回用户信息，同时需要将session_key存到redis,后续手机号码授权时需要用到。如果不存在，表示未授权登录。跳转到授权登录

//获取用户是否已经授权
    public function getUserId()
    {
        $code   =   $this->input->post('code');
        if (empty($code)){
            return $this->fail('','code不能为空');
        }
        $apiData = $this->get_api_data($code);
        if (!isset($apiData['errcode'])){
            $openID= $apiData['openid'];
            $userData = $this->AppUserModel->get(['openid'=>$openID]);
            if (empty($userData)) {
                return $this->fail('','未授权');
            }else{
                $sessionKey = $apiData['session_key'];
                $mc = &load_cache('redis');
                $mc->save('session_key', $sessionKey, 3600);
                $returnData['uid']=$userData['id'];
                return $this->success($returnData,'已授权');
            }
        }else {
            return $this->fail('','获取openid失败');
        }

    }

第三步 :微信授权登录，获取openid和session_key。然后通过解密获取到用户信息

//未授权用户，请求微信接口，进行授权，获取用户信息
public function saveUser()
    {
        $appid  =  "自己的APPID" ;
        $code   =   $this->input->post('code');
        if (empty($code)){
            return $this->fail('','code不能为空');
        }
        $encryptedData   =   $this->input->post('encryptedData');
        if (empty($encryptedData)){
            return $this->fail('','encryptedData不能为空');
        }
        $iv   =   $this->input->post('iv');
        if (empty($iv)){
            return $this->fail('','iv不能为空');
        }


        $apiData = $this->get_api_data($code);

        if(!isset($apiData['errcode'])){
            $sessionKey = $apiData['session_key'];

            $userifo = new WXBizDataCrypt($appid, $sessionKey);
            $errCode = $userifo->decryptData($encryptedData, $iv, $data );

            if ($errCode == 0) {
                $data = json_decode($data,true);
                $userData = [
                    'nickname' =>$data['nickName'],
                    'headimg'  =>$data['avatarUrl'],
                    'unionid'  =>$data['unionId'],
                    'openid'  =>$data['openId'],
                    'c_time'  =>time(),
                ];
                $result = $this->AppUserModel->get(['openid'=>$data['openId']]);
                if (!$result){
                    $userDataId = $this->AppUserModel->add($userData);
                    if ($userDataId){
                        $returnData['uid']=$userDataId;
                        return $this->success($returnData,'已授权');
                    }else{
                        return $this->fail('','授权失败');
                    }
                }else{

                     $this->AppUserModel->update($userData,['openid'=>$data['openId']]);
                    $returnData['uid']=$result['id'];
                    return $this->success($returnData,'已授权');
                }
            }
        }else{
            return $this->fail($apiData,'获取用户信息失败');
        }
    }

第四步 : 这边是手机号码授权，获取用户手机号码

//获取用户手机号码授权
    public function getUserMobile()
    {
        $encryptedData   =   $this->input->post('encryptedData');

        if (empty($encryptedData)){
            return $this->fail('','encryptedData不能为空');
        }
        $iv   =   $this->input->post('iv');
        if (empty($iv)){
            return $this->fail('','iv不能为空');
        }
        $uid   =   $this->input->post('uid');
        if (empty($uid)){
            return $this->fail('','uid不能为空');
        }
        $appid  =  "自己的APPID" ;
        //读取redis
        $mc = &load_cache('redis');
        $sessionKey= $mc->get('session_key');

        include_once APPPATH."/third_party/WeChat/wxBizDataCrypt.php";
        $userifo = new WXBizDataCrypt($appid, $sessionKey);

        $errCode = $userifo->decryptData($encryptedData, $iv, $data );

        if ($errCode == 0) {
            $data = json_decode($data,true);
            $userData = [
                'mobile' =>$data['phoneNumber'],
            ];

            $where['id'] = $uid;
            $result = $this->AppUserModel->update($userData,$where);
            if ($result){
                return $this->success('','手机号码已授权');
            }else{
                return $this->fail('','手机号码授权失败');
            }

        }else{
            return $this->fail('','获取用户手机号码失败');
        }

    }