workorder/application/controllers/Index.php

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

/**
 * Class 登录类
 */
class Index extends Public_Controller {
    function __construct(){
			parent::__construct();
			$this->load->helper(array('form','date'));
			$this->load->model("user_model");
    }

    /**
     * 登录页面
     */
    public function login(){
        if($this->session->user_id){
            redirect(base_url()."main/index");
        }
        $this->display("index/login.html");
    }

    /**
     * 检查登录
     */
    public function check_login(){
        if($this->input->post()){
            $message = "";
            $username = $this->input->post("username");
            $password = $this->input->post("password");
            if($username != "" && $password !="") {
                $user = $this->user_model->get_user_with_username_password($username, hash_hmac('sha256',$password,$this->config->item('secret_key')));
                if (count($user) >= 1) {
                    if ($user[0]['status'] == "20") {
                        $message = "该帐号未验证，请验证后再登录！";
                    } elseif ($user[0]['status'] == "30") {
                        $message = "该帐号已锁定，请联系管理员！";
                    } elseif ($user[0]['status'] == "40") {
                        $message = "该帐号已停用，请联系管理员！";
                    } else {
                        $rand = substr(md5(microtime()), rand(0, 26), 5);
                        $session_data = array("user_id" => (string)$user[0]["user_id"], "current_key" => $rand, "username" => $user[0]['username'], "user_type" => $user[0]['user_type']);
                        $user[0]['last_login_time'] = new MongoDB\BSON\UTCDateTime(time()*1000);
                        $this->user_model->update_user($user[0]);
                        $this->session->set_userdata($session_data);
                    }
                } else {
                    $message = "帐号名或密码错误，请重试！";
                }
            }else{
                $message = "用户名或密码不能为空！";
            }
            if($message != "") {
                $this->response(array("msg" => $message));
            }else{
                $this->response(array("url" => "main/index"));
            }
        } else{
            $message = "参数错误，请重试！";
            $this->response(array("msg"=>$message));
        }
    }

    /**
     * 登出
     */
    public function logout(){
        if($this->session->user_id){
            $this->session->unset_userdata(array("user_id","current_key","username","user_type","from"));
        }
        redirect("login");
    }
}