[转]Laravel-admin 登录添加验证码

原文 https://laravel-china.org/articles/18481

示例：

[

操作：

一、安装验证码库

a、引入验证码库：

composer require mews/captcha

#### b、修改config/app.php
```php
    'providers' => [
        // ...
        Mews\Captcha\CaptchaServiceProvider::class,
    ]   

     'aliases' => [
        // ...
        'Captcha' => Mews\Captcha\Facades\Captcha::class,
    ]

####  c、php artisan vendor:publish
####  d、修改config/captcha.php的default
```php
        return [
            'default'   => [
                'length'    => 5,
                'width'     => 120,
                'height'    => 36,
                'quality'   => 90,
            ],
            // ...
        ];

二、修改登录方法

复制vendor/encore/laravel-admin/src/Controllers/AuthController.php到app/Admin/Controllers/AuthController.php，修改代码如下：

        <?php

        namespace App\Admin\Controllers;

        use Illuminate\Http\Request;
        use Illuminate\Routing\Controller;
        use Illuminate\Support\Facades\Auth;
        use Illuminate\Support\Facades\Lang;
        use Illuminate\Support\Facades\Redirect;
        use Illuminate\Support\Facades\Validator;

        class AuthController extends Controller
        {
            /**
             * Login page.
             *
             * @return \Illuminate\Contracts\View\Factory|Redirect|\Illuminate\View\View
             */
            public function getLogin()
            {
                if (!Auth::guard('admin')->guest()) {
                    return redirect(config('admin.route.prefix'));
                }

                return view('admin.login');
            }

            /**
             * @param Request $request
             *
             * @return mixed
             */
            public function postLogin(Request $request)
            {
                $credentials = $request->only(['username', 'password','captcha']);

                $validator = Validator::make($credentials, [
                    'username' => 'required',
                    'password' => 'required',
                    'captcha' => 'required|captcha'
                ]);

                if ($validator->fails()) {
                    return Redirect::back()->withInput()->withErrors($validator);
                }

                unset($credentials['captcha']);

                if (Auth::guard('admin')->attempt($credentials)) {
                    admin_toastr(trans('admin.login_successful'));

                    return redirect()->intended(config('admin.route.prefix'));
                }

                return Redirect::back()->withInput()->withErrors(['username' => $this->getFailedLoginMessage()]);
            }

            /**
             * @return string|\Symfony\Component\Translation\TranslatorInterface
             */
            protected function getFailedLoginMessage()
            {
                return Lang::has('auth.failed')
                    ? trans('auth.failed')
                    : 'These credentials do not match our records.';
            }
        }

三、添加验证错误（根据自己的lang修改）；我的是中文 在resources/lang/zh-CN/validation.php中添加。

    'captcha'               => ':attribute 错误',
    'attributes'           => [
            'captcha'               => '验证码',
            //...
    ]

四、修改页面：

复制vendor/encore/laravel-admin/resources/views/login.blade.php到resources/views/admin/login.blade.php。
新增内容如下：

        <div class="form-group has-feedback {!! !$errors->has('password') ?: 'has-error' !!}">

          @if($errors->has('password'))
            @foreach($errors->get('password') as $message)
              <label class="control-label" for="inputError"><i class="fa fa-times-circle-o"></i>{{$message}}</label></br>
            @endforeach
          @endif

          <input type="password" class="form-control" placeholder="{{ trans('admin::lang.password') }}" name="password" value="{{ old('username') }}">
          <span class="glyphicon glyphicon-lock form-control-feedback"></span>
        </div>
        <div class="row">
        <div class="form-group has-feedback {!! !$errors->has('captcha') ?: 'has-error' !!}">

          @if($errors->has('captcha'))
            @foreach($errors->get('captcha') as $message)
              <label class="control-label" for="inputError" style=" margin-left: 15px"><i class="fa fa-times-circle-o"></i>{{$message}}</label></br>
            @endforeach
          @endif

          <input type="text" class="form-control" style="display: inline;width: 55%; margin-left: 15px" placeholder="{{ trans('admin.captcha') }}" name="captcha">
            <span class="glyphicon glyphicon-refresh form-control-feedback captcha" style="right:39%;z-index: 100"></span>
            <img  class="captcha" src="{{ captcha_src('admin') }}">
        </div>
        <script>
          $(function () {

            $('.captcha').click(function () {
                $('img[class="captcha"]').attr('src','{{ captcha_src('admin') }}'+Math.random());
            });
          });
        </script>

五、app/Admin/routes.php中新增，覆盖原来的路由

     $router->get('auth/login', 'AuthController@getLogin');
     $router->post('auth/login', 'AuthController@postLogin');