php 小程序登录流程及代码

第一次做小程序，记录一下。以便后续自己查找~ 

首先。看一下微信的登录流程图

步骤：在客户端获取当前登录微信用户的登录凭证(code)。使用该凭证向微信服务器换取该微信用户的唯一标识(openid)和会话密钥(session_key)。引用微信加解密，获取用户信息。

注意：

1.未进行登录验证。

2.引用加解密是，路径要正确。

    //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 = $this->getApiData($code);

        if(!isset($apiData['errcode'])){
            $sessionKey = $apiData['session_key'];
            //获取sessionKey  进行解密
            $userifo = new WXBizDataCrypt($appid, $sessionKey);
            $errCode = $userifo->decryptData($encryptedData, $iv, $data );

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

//获取openid
    public function getApiData($code)
    {
        $appid  =  "自己的appid" ;
        $secret =   "自己的secret";
        $URL = "https://api.weixin.qq.com/sns/jscode2session?appid=$appid&secret=$secret&js_code=$code&grant_type=authorization_code";
        $apiData=file_get_contents($URL);
        return json_decode($apiData,true);
    }

 未避免多次获取。在登录之前先进行验证。

 //获取用户是否已经授权
    public function userId()
    {


        $code   =   $this->input->get('code');
        if (empty($code)){
            return $this->fail('','code不能为空');
        }

        $apiData = $this->getApiData($code);
        if (!isset($apiData['errcode'])){
            $openID= $apiData['openid'];
            $userData = $this->AppUserModel->get(['openid'=>$openID]);
            if (empty($userData)) {
                return $this->fail('','未授权');
            }else{

                //这边保存sessionKey ，方便后面手机号码授权
                $sessionKey = $apiData['session_key'];
                $mc = &load_cache('redis');
                $mc->save('session_key', $sessionKey, 3600);
                $returnData = [
                    'uid'=>$userData['id'],
                    'type'=>$userData['type']
                ];
                return $this->success($returnData,'已授权');
            }
        }else {
            return $this->fail('','获取openid失败');
        }

    }