Lumen 仿 Laravel 表單驗證

1、新增FormRequest基類

<?php

namespace App\Rules;

use Illuminate\Http\Request as IlluminateRequest;
use Illuminate\Http\JsonResponse;
use Illuminate\Container\Container;
use Illuminate\Contracts\Validation\Validator;
use Illuminate\Validation\ValidatesWhenResolvedTrait;
use Illuminate\Contracts\Validation\ValidatesWhenResolved;
use Illuminate\Contracts\Validation\Factory as ValidationFactory;
use Illuminate\Validation\ValidationException;

class FormRequest extends IlluminateRequest implements ValidatesWhenResolved
{
    use ValidatesWhenResolvedTrait;

    /**
     * The container instance.
     *
     * @var \Illuminate\Container\Container
     */
    protected $container;

    /**
     * Get the validator instance for the request.
     *
     * @return \Illuminate\Contracts\Validation\Validator
     */
    protected function getValidatorInstance()
    {
        $factory = $this->container->make(ValidationFactory::class);

        if (method_exists($this, 'validator')) {
            return $this->container->call([$this, 'validator'], compact('factory'));
        }

        return $factory->make(
            $this->validationData(), $this->container->call([$this, 'rules']), $this->messages(), $this->attributes()
        );
    }

    /**
     * Get data to be validated from the request.
     *
     * @return array
     */
    protected function validationData()
    {
        return $this->all();
    }

    /**
     * Handle a failed validation attempt.
     *
     * @param  \Illuminate\Contracts\Validation\Validator $validator
     * @return void
     *
     * @throws \Illuminate\Http\Exception\HttpResponseException
     */
    protected function failedValidation(Validator $validator)
    {
        throw new ValidationException($validator);
    }

    /**
     * Get the proper failed validation response for the request.
     *
     * @param  array $errors
     * @return \Symfony\Component\HttpFoundation\Response
     */
    public function response(array $errors)
    {
        return new JsonResponse($errors, 200);
    }

    /**
     * Set the container implementation.
     *
     * @param  \Illuminate\Container\Container $container
     * @return $this
     */
    public function setContainer(Container $container)
    {
        $this->container = $container;

        return $this;
    }

    /**
     * Get custom messages for validator errors.
     *
     * @return array
     */
    public function messages(){
        return [];
    }

    public function rules(){
        return [];
    }

    /**
     * Get custom attributes for validator errors.
     *
     * @return array
     */
    public function attributes()
    {
        return [];
    }
}

2、新增表單驗證服務提供者

<?php

namespace App\Providers;


use App\Rules\FormRequest;
use Illuminate\Contracts\Validation\ValidatesWhenResolved;
use Laravel\Lumen\Application;
use Laravel\Lumen\Providers\EventServiceProvider as ServiceProvider;
use Illuminate\Http\Request as IlluminateRequest;

class FormRequestServiceProvider extends ServiceProvider
{
    public function boot()
    {
        $this->app->afterResolving(ValidatesWhenResolved::class, function ($resolved) {
            $resolved->validateResolved();
        });

        $this->app->resolving(FormRequest::class, function (FormRequest $request, Application $app) {
            $this->initializeRequest($request, $app['request']);
            $request->setContainer($app);
        });
    }

    public function register()
    {

    }

    protected function initializeRequest(FormRequest $form, IlluminateRequest $current)
    {
        $files = $current->files->all();

        $files = is_array($files) ? array_filter($files) : $files;

        $form->initialize(
            $current->query->all(),
            $current->request->all(),
            $current->attributes->all(),
            $current->cookies->all(),
            $files,
            $current->server->all(),
            $current->getContent()
        );

        $form->setJson($current->json());

        if ($session = $current->getSession()) {
            $form->setLaravelSession($session);
        }

        $form->setUserResolver($current->getUserResolver());

        $form->setRouteResolver($current->getRouteResolver());
    }
}

3、bootstrap/app.php中註冊服務提供者

$app->register(\App\Providers\FormRequestServiceProvider::class);

使用示例：

# Controller

public function store(TestStore $request){

}

# Rules

class TestStore extends FormRequest{

    public function authorize(){
        return true;
    }

    public fucntion rules()
    {
        return [
            'title'=>'required'
        ]
    }

    public function messages(){
        return [
            'title.required'=>'標題不能為空'
        ]
    }
}

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