laravelの機能、MultiAuthログインの実装メモ。

##環境
MacOS 10.14.3
VisualStudio
laravel 5.7

##やりたいこと
Admin、Userページそれぞれでログイン、ログアウトさせる

##準備
１. プロジェクトの作成

terminal

composer create-project laravel/laravel multiauth_test

２. DBの作成
３. .envを編集

.env

DB_DATABASE=作ったDB名
DB_USERNAME=ユーザ名
DB_PASSWORD=パスワード

#User認証
##認証機能のインストール

terminal

php artisan make:auth

##テーブル作成

terminal

php artisan migrate

usersはデフォルトでファイルが用意されているので、これだけでOK

##auth.php

config/auth.php


'guards' => [
        'web' => [
            'driver' => 'session',
            'provider' => 'users',
        ],

        'api' => [
            'driver' => 'token',
            'provider' => 'users',
            'hash' => false,
        ],


+        'user' => [
+           'driver' => 'session',
+            'provider' => 'users',
+       ],
    ],

##Handler.php
認証エラーだった時の処理をカスタマイズ。
オーバーライドで書き込みます。

app/Exceptions/Handler.php

<?php

namespace App\Exceptions;

use Exception;
use Illuminate\Foundation\Exceptions\Handler as ExceptionHandler;


+use Request;
+use Response;
+use Illuminate\Auth\AuthenticationException;

class Handler extends ExceptionHandler
{
    /**
     * A list of the exception types that are not reported.
     *
     * @var array
     */
    protected $dontReport = [
        //
    ];

    /**
     * A list of the inputs that are never flashed for validation exceptions.
     *
     * @var array
     */
    protected $dontFlash = [
        'password',
        'password_confirmation',
    ];

    /**
     * Report or log an exception.
     *
     * @param  \Exception  $exception
     * @return void
     */
    public function report(Exception $exception)
    {
        parent::report($exception);
    }

    /**
     * Render an exception into an HTTP response.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Exception  $exception
     * @return \Illuminate\Http\Response
     */
    public function render($request, Exception $exception)
    {
        return parent::render($request, $exception);
    }


+    protected function unauthenticated($request, AuthenticationException $exception)
+    {
+        if ($request->expectsJson()) {
+            return response()->json(['error' => 'Unauthenticated.'], 401);
+        }
+        if (in_array('user', $exception->guards())) {
+            return redirect()->guest('user/login');
+       }
+        return redirect()->guest(route('login'));
+    }
}

##Controllerの作成
make:authで生成されたものをコピーして利用。
直下のAuthフォルダ+Controller.php+HomeController.phpをコピーします。

app/Http/Controllers/Userディレクトリを作りペースト。

app/Http/Controllers

Controllers
├── Auth
│   ├── ForgotPasswordController.php
│   ├── LoginController.php
│   ├── RegisterController.php
│   ├── ResetPasswordController.php
│   └── VerificationController.php
├── Controller.php
├── HomeController.php
└── User
    ├── Auth
    │   ├── ForgotPasswordController.php
    │   ├── LoginController.php
    │   ├── RegisterController.php
    │   ├── ResetPasswordController.php
    │   └── VerificationController.php
    ├── Controller.php
    └── HomeController.php

こんな階層になってればOK

###Controller/Usersの編集
####HomeController.php

app/Http/Controllers/User/HomeController.php

<?php


+namespace App\Http\Controllers\User;

use Illuminate\Http\Request;
+use App\User;

class HomeController extends Controller
{
    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
+        $this->middleware('auth:user');
    }

    /**
     * Show the application dashboard.
     *
     * @return \Illuminate\Contracts\Support\Renderable
     */
    public function index()
    {
+        return view('user.home');
    }
}

####Controller.php

app/Http/Controllers/User/Controller.php

<?php


+namespace App\Http\Controllers\User;

use Illuminate\Foundation\Bus\DispatchesJobs;
use Illuminate\Routing\Controller as BaseController;
use Illuminate\Foundation\Validation\ValidatesRequests;
use Illuminate\Foundation\Auth\Access\AuthorizesRequests;

class Controller extends BaseController
{
    use AuthorizesRequests, DispatchesJobs, ValidatesRequests;
}

####LoginController.php

app/Http/Controllers/User/Auth/LoginController.php

<?php


+namespace App\Http\Controllers\User\Auth;

use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\AuthenticatesUsers;
+use Illuminate\Http\Request;

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 = '/user/home';

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
+        $this->middleware('guest:user')->except('logout');
    }


+    public function showLoginForm()
+    {
+        return view('user.auth.login');
+    }


+    public function guard()
+    {
+        return \Auth::guard('user');
+    }


+    public function logout(Request $request)
+    {
+        $this->guard('user')->logout();
+        return redirect('/');
+    }
}

####RegisterController.php

app/Http/Controllers/User/Auth/RegisterController.php

<?php


+namespace App\Http\Controllers\User\Auth;

use App\User;
use App\Http\Controllers\Controller;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Facades\Validator;
use Illuminate\Foundation\Auth\RegistersUsers;
+use Illuminate\Http\Request;


class RegisterController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Register Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles the registration of new users as well as their
    | validation and creation. By default this controller uses a trait to
    | provide this functionality without requiring any additional code.
    |
    */

    use RegistersUsers;

    /**
     * Where to redirect users after registration.
     *
     * @var string
     */
+    protected $redirectTo = '/user/home';

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
+        $this->middleware('guest:user');
    }
+    public function showRegisterForm()
+    {
+        return view('user.auth.register');
+    }

    /**
     * Get a validator for an incoming registration request.
     *
     * @param  array  $data
     * @return \Illuminate\Contracts\Validation\Validator
     */
    protected function validator(array $data)
    {
        return Validator::make($data, [
            'name' => ['required', 'string', 'max:255'],
            'email' => ['required', 'string', 'email', 'max:255', 'unique:users'],
            'password' => ['required', 'string', 'min:8', 'confirmed'],
        ]);
    }

    /**
     * Create a new user instance after a valid registration.
     *
     * @param  array  $data
     * @return \App\User
     */
    protected function create(array $data)
    {
        return User::create([
            'name' => $data['name'],
            'email' => $data['email'],
            'password' => Hash::make($data['password']),
        ]);
    }
+    protected function guard()
+    {
+        return \Auth::guard('user');
+    }
}

##Viewsの編集
viewsはmake:authをしてるので、下記のような改装になっていると思います。

├── auth
│   ├── login.blade.php
│   ├── passwords
│   │   ├── email.blade.php
│   │   └── reset.blade.php
│   ├── register.blade.php
│   └── verify.blade.php
├── home.blade.php
├── layouts
│   └── app.blade.php
└── welcome.blade.php

Controllerの時と同じように、user専用のviewsを作成します。
以下のディレクトリを作成。

recources/views/layouts/user/app.blade.php
　→layouts/app.blade.phpをコピペ
resources/views/user
　→views直下のauthフォルダ+home.blade.phpをコピペ



下記のような階層になるかと思います。
├── auth
│   ├── login.blade.php
│   ├── passwords
│   │   ├── email.blade.php
│   │   └── reset.blade.php
│   ├── register.blade.php
│   └── verify.blade.php
├── home.blade.php
├── layouts
│   ├── app.blade.php
│   └── user
│       └── app.blade.php
├── user
│   ├── auth
│   │   ├── login.blade.php
│   │   ├── passwords
│   │   │   ├── email.blade.php
│   │   │   └── reset.blade.php
│   │   ├── register.blade.php
│   │   └── verify.blade.php
│   └── home.blade.php
└── welcome.blade.php

####app.blade.php

resources/views/layouts/user/app.blade.php

<!DOCTYPE html>
<html lang="{{ str_replace('_', '-', app()->getLocale()) }}">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- CSRF Token -->
    <meta name="csrf-token" content="{{ csrf_token() }}">

    <title>{{ config('app.name', 'Laravel') }}</title>

    <!-- Scripts -->
    <script src="{{ asset('js/app.js') }}" defer></script>

    <!-- Fonts -->
    <link rel="dns-prefetch" href="//fonts.gstatic.com">
    <link href="https://fonts.googleapis.com/css?family=Nunito" rel="stylesheet" type="text/css">

    <!-- Styles -->
    <link href="{{ asset('css/app.css') }}" rel="stylesheet">
</head>
<body>
    <div id="app">
        <nav class="navbar navbar-expand-md navbar-light navbar-laravel">
            <div class="container">
                <a class="navbar-brand" href="{{ url('/') }}">
                    {{ config('app.name', 'Laravel') }}
                </a>
                <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="{{ __('Toggle navigation') }}">
                    <span class="navbar-toggler-icon"></span>
                </button>

                <div class="collapse navbar-collapse" id="navbarSupportedContent">
                    <!-- Left Side Of Navbar -->
                    <ul class="navbar-nav mr-auto">

                    </ul>

                    <!-- Right Side Of Navbar -->
                    <ul class="navbar-nav ml-auto">
                        <!-- Authentication Links -->
                        @guest
                            <li class="nav-item">
+                                <a class="nav-link" href="{{ route('user.login') }}">{{ __('Login') }}</a>
                            </li>
                            @if (Route::has('register'))
                                <li class="nav-item">
+                                    <a class="nav-link" href="{{ route('user.register') }}">{{ __('Register') }}</a>
                                </li>
                            @endif
                        @else
                            <li class="nav-item dropdown">
                                <a id="navbarDropdown" class="nav-link dropdown-toggle" href="#" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false" v-pre>
                                    {{ Auth::user()->name }} <span class="caret"></span>
                                </a>

                                <div class="dropdown-menu dropdown-menu-right" aria-labelledby="navbarDropdown">
+                                    <a class="dropdown-item" href="{{ route('user.logout') }}"
                                       onclick="event.preventDefault();
                                                     document.getElementById('logout-form').submit();">
                                        {{ __('Logout') }}
                                    </a>


+                                    <form id="logout-form" action="{{ route('user.logout') }}" method="POST" style="display: none;">
                                        @csrf
                                    </form>
                                </div>
                            </li>
                        @endguest
                    </ul>
                </div>
            </div>
        </nav>

        <main class="py-4">
            @yield('content')
        </main>
    </div>
</body>
</html>

####login.blade.php

resources/views/layouts/user/login.blade.php

+@extends('layouts.user.app')

@section('content')
<div class="container">
    <div class="row justify-content-center">
        <div class="col-md-8">
            <div class="card">
                <div class="card-header">{{ __('Login') }}</div>

                <div class="card-body">
+                    <form method="POST" action="{{ route('user.login') }}">
                        @csrf

                        <div class="form-group row">
                            <label for="email" class="col-md-4 col-form-label text-md-right">{{ __('E-Mail Address') }}</label>

                            <div class="col-md-6">
                                <input id="email" type="email" class="form-control{{ $errors->has('email') ? ' is-invalid' : '' }}" name="email" value="{{ old('email') }}" required autofocus>

                                @if ($errors->has('email'))
                                    <span class="invalid-feedback" role="alert">
                                        <strong>{{ $errors->first('email') }}</strong>
                                    </span>
                                @endif
                            </div>
                        </div>

                        <div class="form-group row">
                            <label for="password" class="col-md-4 col-form-label text-md-right">{{ __('Password') }}</label>

                            <div class="col-md-6">
                                <input id="password" type="password" class="form-control{{ $errors->has('password') ? ' is-invalid' : '' }}" name="password" required>

                                @if ($errors->has('password'))
                                    <span class="invalid-feedback" role="alert">
                                        <strong>{{ $errors->first('password') }}</strong>
                                    </span>
                                @endif
                            </div>
                        </div>

                        <div class="form-group row">
                            <div class="col-md-6 offset-md-4">
                                <div class="form-check">
                                    <input class="form-check-input" type="checkbox" name="remember" id="remember" {{ old('remember') ? 'checked' : '' }}>

                                    <label class="form-check-label" for="remember">
                                        {{ __('Remember Me') }}
                                    </label>
                                </div>
                            </div>
                        </div>

                        <div class="form-group row mb-0">
                            <div class="col-md-8 offset-md-4">
                                <button type="submit" class="btn btn-primary">
                                    {{ __('Login') }}
                                </button>

                                @if (Route::has('password.request'))
+                                    <a class="btn btn-link" href="{{ route('user.password.request') }}">
                                        {{ __('Forgot Your Password?') }}
                                    </a>
                                @endif
                            </div>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
</div>
@endsection

##ルーティングの設定
/user以下で画面が表示されるように設定します。
ひとまず、最低限のページルートのみ設定。
他のページも利用するときはその都度同じように設定すればOK。

routes/web.php


<?php


+use Illuminate\Http\Request;

Route::get('/', function () {
    return view('welcome');
});

Auth::routes();

Route::get('/home', 'HomeController@index')->name('home');


+// User
+Route::group(['namespace' => 'User','prefix'=>'user'],function(){
+    Route::get('/',function(){
+        return redirect()->to('user/home');
+    })->name('user');
+    // home
+    Route::get('home','HomeController@index')->name('user.home');


+    // login lgoout
+    Route::get('login','Auth\LoginController@showLoginForm')->name('user.login');
+    Route::post('login','Auth\LoginController@login')->name('user.login');
+    Route::post('logout','Auth\LoginController@logout')->name('user.logout');


+    // register
+    Route::get('register','Auth\RegisterController@showRegisterForm')->name('user.register');
+    Route::post('register','Auth\RegisterController@register')->name('user.register');

#Admin認証
adminはuserの手順とほぼ同じです。

##テーブル・モデルの作成

terminal

php artisan make:model Admin -m

下記のテーブルとモデルができたかと思います。
app/Admin.php
database/201x_xx_xx_xxxxxx_create_admins_table.php

###テーブル編集
userテーブルと同じ内容にします。

create_admins_table.php

public function up()
    {
        Schema::create('admins', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name');
            $table->string('email')->unique();
            $table->timestamp('email_verified_at')->nullable();
            $table->string('password');
            $table->rememberToken();
            $table->timestamps();
        });
    }

###Admin.php
これもUser.phpとほぼ同じで、Authenticatableを継承

Admin.php

<?php

namespace App;

use Illuminate\Notifications\Notifiable;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Contracts\Auth\MustVerifyEmail;
use Illuminate\Foundation\Auth\User as Authenticatable;

class Admin extends Authenticatable 
{
    use Notifiable;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name', 'email', 'password','api_token'
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password', 'remember_token',
    ];
}

##auth.php

config/auth.php

<?php

return [
    'defaults' => [
        'guard' => 'web',
        'passwords' => 'users',
    ],

    'guards' => [
        'web' => [
            'driver' => 'session',
            'provider' => 'users',
        ],
        'api' => [
            'driver' => 'token',
            'provider' => 'users',
        ],
        'user' => [
            'driver' => 'session',
            'provider' => 'users',
        ],
+       'admin' => [
+           'driver' => 'session',
+           'provider' => 'admins'
+       ]
    ],

    'providers' => [
        'users' => [
            'driver' => 'eloquent',
            'model' => App\User::class,
        ],
+       'admins' => [
+           'driver' => 'eloquent',
+           'model' => App\Admin::class,
+       ],
    ],

    'passwords' => [
        'users' => [
            'provider' => 'users',
            'table' => 'password_resets',
            'expire' => 60,
        ],
+       'admins' => [
+           'provider' => 'admins',
+           'table' => 'password_resets',
+           'expire' => 60,
+       ],
    ],
];

##Handler.php

app/Exceptions/Handler.php

protected function unauthenticated($request, AuthenticationException $exception)
{
    if($request->expectsJson()){
        return response()->json(['error' => 'Unauthenticated.'],401);
    }

    if(in_array('user',$exception->guards())){
        return redirect()->guest('user/login');
    }


+   if(in_array('admin',$exception->guards())){
+       return redirect()->guest('admin/login');
+   }

    return redirect()->back()->withInput(Input::all());

}

##Controller
さっき作った”app/Http/Controller/User”フォルダを同じ階層にコピペしてAdminにリネームします。

###Controller・Adminの編集
####HomeController.php

app/Http/Controllers/Admin/HomeController.php

<?php


+namespace App\Http\Controllers\Admin;

use Illuminate\Http\Request;
use App\User;

class HomeController extends Controller
{
    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
+        $this->middleware('auth:admin');
    }

    /**
     * Show the application dashboard.
     *
     * @return \Illuminate\Contracts\Support\Renderable
     */
    public function index()
    {
+        return view('admin.home');
    }
}

####Controller.php

app/Http/Controllers/Admin/Controller.php

<?php


+namespace App\Http\Controllers\Admin;

use Illuminate\Foundation\Bus\DispatchesJobs;
use Illuminate\Routing\Controller as BaseController;
use Illuminate\Foundation\Validation\ValidatesRequests;
use Illuminate\Foundation\Auth\Access\AuthorizesRequests;

class Controller extends BaseController
{
    use AuthorizesRequests, DispatchesJobs, ValidatesRequests;
}

####LoginController.php

app/Http/Controllers/Admin/Auth/LoginController.php

<?php


+namespace App\Http\Controllers\Admin\Auth;

use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\AuthenticatesUsers;
+use Illuminate\Http\Request;

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/home';

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
+        $this->middleware('guest:admin')->except('logout');
    }

    public function showLoginForm()
    {
+        return view('admin.auth.login');
    }

    public function guard()
    {
+        return \Auth::guard('admin');
    }

    public function logout(Request $request)
    {
+        $this->guard('admin')->logout();
        return redirect('/');
    }
}

####RegisterController.php

app/Http/Controller/Admin/Auth/RegisterController.php

<?php


+namespace App\Http\Controllers\Admin\Auth;

use App\User;
use App\Http\Controllers\Controller;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Facades\Validator;
use Illuminate\Foundation\Auth\RegistersUsers;
+use Illuminate\Http\Request;


+use App\Admin;

class RegisterController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Register Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles the registration of new users as well as their
    | validation and creation. By default this controller uses a trait to
    | provide this functionality without requiring any additional code.
    |
    */

    use RegistersUsers;

    /**
     * Where to redirect users after registration.
     *
     * @var string
     */
+    protected $redirectTo = '/admin/home';

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
+        $this->middleware('guest:admin');
    }
    public function showRegisterForm()
    {
+        return view('admin.auth.register');
    }

    /**
     * Get a validator for an incoming registration request.
     *
     * @param  array  $data
     * @return \Illuminate\Contracts\Validation\Validator
     */
    protected function validator(array $data)
    {
        return Validator::make($data, [
            'name' => ['required', 'string', 'max:255'],
+           'email' => ['required', 'string', 'email', 'max:255', 'unique:admins'],
            'password' => ['required', 'string', 'min:8', 'confirmed'],
        ]);
    }

    /**
     * Create a new user instance after a valid registration.
     *
     * @param  array  $data
     * @return \App\Admin
     */
    protected function create(array $data)
    {
+        return Admin::create([
            'name' => $data['name'],
            'email' => $data['email'],
            'password' => Hash::make($data['password']),
        ]);
    }
    protected function guard()
    {
+        return \Auth::guard('admin');
    }
}

##Views
Controllerと同様、userで作成したファイルをコピペして、adminにリネームします。

####app.blade.php

layouts/admin/app.blade.php


<!DOCTYPE html>
<html lang="{{ str_replace('_', '-', app()->getLocale()) }}">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- CSRF Token -->
    <meta name="csrf-token" content="{{ csrf_token() }}">

    <title>{{ config('app.name', 'Laravel') }}</title>

    <!-- Scripts -->
    <script src="{{ asset('js/app.js') }}" defer></script>

    <!-- Fonts -->
    <link rel="dns-prefetch" href="https://fonts.gstatic.com">
    <link href="https://fonts.googleapis.com/css?family=Nunito" rel="stylesheet" type="text/css">

    <!-- Styles -->
    <link href="{{ asset('css/app.css') }}" rel="stylesheet">
</head>
<body>
    <div id="app">
        <nav class="navbar navbar-expand-md navbar-light navbar-laravel">
            <div class="container">
                <a class="navbar-brand" href="{{ url('/') }}">
                    {{ config('app.name', 'Laravel') }}
                </a>
                <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="{{ __('Toggle navigation') }}">
                    <span class="navbar-toggler-icon"></span>
                </button>

                <div class="collapse navbar-collapse" id="navbarSupportedContent">
                    <!-- Left Side Of Navbar -->
                    <ul class="navbar-nav mr-auto">

                    </ul>

                    <!-- Right Side Of Navbar -->
                    <ul class="navbar-nav ml-auto">
                        <!-- Authentication Links -->
                        @guest
                            <li class="nav-item">
+                               <a class="nav-link" href="{{ route('admin.login') }}">{{ __('Login') }}</a>
                            </li>
                            <li class="nav-item">
                                @if (Route::has('register'))
+                                   <a class="nav-link" href="{{ route('admin.register') }}">{{ __('Register') }}</a>
                                @endif
                            </li>
                        @else
                            <li class="nav-item dropdown">
                                <a id="navbarDropdown" class="nav-link dropdown-toggle" href="#" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false" v-pre>
                                    {{ Auth::user()->name }} <span class="caret"></span>
                                </a>

                                <div class="dropdown-menu dropdown-menu-right" aria-labelledby="navbarDropdown">
+                                   <a class="dropdown-item" href="{{ route('admin.logout') }}"
                                       onclick="event.preventDefault();
                                                     document.getElementById('logout-form').submit();">
                                        {{ __('Logout') }}
                                    </a>


+                                   <form id="logout-form" action="{{ route('admin.logout') }}" method="POST" style="display: none;">
                                        @csrf
                                    </form>
                                </div>
                            </li>
                        @endguest
                    </ul>
                </div>
            </div>
        </nav>

        <main class="py-4">
            @yield('content')
        </main>
    </div>
</body>
</html>

####login.blade.php

views/admin/login.blade.php



+@extends('layouts.admin.app')

@section('content')
<div class="container">
    <div class="row justify-content-center">
        <div class="col-md-8">
            <div class="card">
                <div class="card-header">{{ __('Login') }}</div>

                <div class="card-body">
+                    <form method="POST" action="{{ route('admin.login') }}">
                        @csrf

                        <div class="form-group row">
                            <label for="email" class="col-md-4 col-form-label text-md-right">{{ __('E-Mail Address') }}</label>

                            <div class="col-md-6">
                                <input id="email" type="email" class="form-control{{ $errors->has('email') ? ' is-invalid' : '' }}" name="email" value="{{ old('email') }}" required autofocus>

                                @if ($errors->has('email'))
                                    <span class="invalid-feedback" role="alert">
                                        <strong>{{ $errors->first('email') }}</strong>
                                    </span>
                                @endif
                            </div>
                        </div>

                        <div class="form-group row">
                            <label for="password" class="col-md-4 col-form-label text-md-right">{{ __('Password') }}</label>

                            <div class="col-md-6">
                                <input id="password" type="password" class="form-control{{ $errors->has('password') ? ' is-invalid' : '' }}" name="password" required>

                                @if ($errors->has('password'))
                                    <span class="invalid-feedback" role="alert">
                                        <strong>{{ $errors->first('password') }}</strong>
                                    </span>
                                @endif
                            </div>
                        </div>

                        <div class="form-group row">
                            <div class="col-md-6 offset-md-4">
                                <div class="form-check">
                                    <input class="form-check-input" type="checkbox" name="remember" id="remember" {{ old('remember') ? 'checked' : '' }}>

                                    <label class="form-check-label" for="remember">
                                        {{ __('Remember Me') }}
                                    </label>
                                </div>
                            </div>
                        </div>

                        <div class="form-group row mb-0">
                            <div class="col-md-8 offset-md-4">
                                <button type="submit" class="btn btn-primary">
                                    {{ __('Login') }}
                                </button>

                                @if (Route::has('password.request'))
+                                    <a class="btn btn-link" href="{{ route('admin.password.request') }}">
                                        {{ __('Forgot Your Password?') }}
                                    </a>
                                @endif
                            </div>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
</div>
@endsection

##ルーティングの設定
userと同様。
userのルーティングの下に追加します。

php/routes/web.php


// Admin
Route::group(['namespace' => 'Admin','prefix'=>'admin'],function(){
    Route::get('/',function(){
        return redirect()->to('admin/home');
    })->name('admin');
    // home
    Route::get('home','HomeController@index')->name('admin.home');

    // login logout
    Route::get('login','Auth\LoginController@showLoginForm')->name('admin.login');
    Route::post('login','Auth\LoginController@login')->name('admin.login');
    Route::post('logout','Auth\LoginController@logout')->name('admin.logout');

    // register
    Route::get('register','Auth\RegisterController@showRegisterForm')->name('admin.register');
    Route::post('register','Auth\RegisterController@register')->name('admin.register');

##動作確認

php artisan serve

User
http://127.0.0.1:8000/user/login
Admin
http://127.0.0.1:8000/admin/login

それぞれで、ログイン・ログアウトできるか確認します。
別々に動作していれば成功です。