登录方法借鉴

<?php
defined('BASEPATH') OR exit('No direct script access allowed');
/**
* Created by PhpStorm.
* User: huangyaokui
* Date: 16/4/23
* Time: 下午2:17
*/
class Common_Controller extends CI_Controller
{
protected $user_id = 0;
protected $session_data = [];
//不用用户认证的方法在$except数组里配置
protected $except = [];

public function __construct()
{
parent::__construct();

try{
$this->authentication();
}catch (Exception $e){
$this->errorResponse($e);
}
}

/**
* 是否需要登录认证
* @return bool
*/
private function isCheck()
{
$array = array_change_key_case(array_flip($this->except));
$method = strtolower($this->router->method);

return array_key_exists($method, $array) ? false : true;
}

/**
* 登录认证
* @throws Exception
*/
private function authentication()
{
if ( $this->isCheck() ) {
$token = $this->input->get_post('token', true);

if ($token) {
$this->checkCache(trim($token));
}else{
throw new Exception('请登录', '401');
}
}
}

/**
* 从缓存里查询用户是否登录
* @param $token
* @throws Exception
*/
private function checkCache($token)
{
$data = [];
if ( $this->cache->memcached->is_supported() ){
$data = $this->cache->memcached->get($token);
if (!$data) {
$data = $this->checkData($token);
}
}else{
$data = $this->checkData($token);
}

if ($data) {
$this->user_id = $data['userId'];
$this->session_data = $data;
}else{
throw new Exception('请登录', '401');
}
}

/**
* 从数据库认证
* @param $token
* @throws Exception
*/
private function checkData($token)
{
$this->load->model('token_model');

$result = $this->token_model->get([
'where' => [
'token' => $token
],
'default_limit' => 1,
'order' => 'created desc'
]);

if ($result) {
if ($result['0']['expire'] < time()) {
throw new Exception('请重新登录', '401');
}

$this->session_data = json_decode($result['0']['data'], true);
$this->user_id = $this->session_data['userId'];
}else{
throw new Exception('请登录', '401');
}
}

/**
* 成功返回
* @param array $data
*/
protected function successResponse(array $data)
{
echo json_encode([
'data' => $data ?: new stdClass(),
'status' => 0,
'message' => ''
]);
exit;
}

/**
* 失败返回
* @param $code
*/
protected function errorResponse(Exception $exception)
{
echo json_encode([
'data' => new stdClass(),
'status' => $exception->getCode(),
'message' => $exception->getMessage()
]);
exit;
}
}