Laravel5.5基于内置的Auth模块实现前后台登陆详解

php artisan make:auth

'guards' => [
 //...
 'admin' => [
  'driver' => 'session',
  'provider' => 'users',
 ],
 //...
 ],

class admincontroller extends basecontroller
{
 use authorizesrequests, dispatchesjobs, validatesrequests;

 public function __construct()
 {
 $this->middleware('auth:admin');
 }
}

<?php
namespace apphttpcontrollersadmin;
use apphttpcontrollerscontroller;
use illuminatesupportfacadesauth;
use illuminatefoundationauthauthenticatesusers;
use illuminatehttprequest;
class logincontroller extends controller
{
 /*
 |--------------------------------------------------------------------------
 | login controller
 |--------------------------------------------------------------------------
 |
 | this controller handles authenticating users for the application and
 | redirecting them to your home screen. the controller uses a trait
 | to conveniently provide its functionality to your applications.
 |
 */
 use authenticatesusers;
 /**
 * where to redirect users after login.
 *
 * @var string
 */
 protected $redirectto = '/admin';
 /**
 * create a new controller instance.
 *
 * @return void
 */
 public function __construct()
 {
 $this->middleware('guest:admin')->except('logout');
 }
 /**
 * 重写登陆页面
 * @return illuminatecontractsviewfactory|illuminateviewview
 */
 public function showloginform()
 {
 return view('backend.login');
 }
 /**
 * 重写退出方法
 * @param request $request
 * @return illuminatehttpredirectresponse|illuminateroutingredirector
 */
 public function logout(request $request)
 {
 $this->guard()->logout();
 $request->session()->flush();
 $request->session()->regenerate();
 return redirect('/admin/login');
 }
 /**
 * 重写guard认证
 * @return mixed
 */
 protected function guard()
 {
 return auth::guard('admin');
 }
}

public function handle($request, closure $next, $guard = null)
{
 if (auth::guard($guard)->check()) {
  $path = $guard ? '/admin' : '/home';
  return redirect($path);
 }
 return $next($request);
}

/**
 * 重写实现未认证用户跳转至相应登陆页
 * @param illuminatehttprequest $request
 * @param authenticationexception $exception
 * @return illuminatehttpjsonresponse|illuminatehttpredirectresponse
 */
 protected function unauthenticated($request, authenticationexception $exception)
 {
 if($request->expectsjson()){
  return response()->json(['message' => $exception->getmessage()], 401);
 }else{
  return in_array('admin', $exception->guards()) ? return redirect()->guest('/admin/login') : redirect()->guest('login');
 }
 }