如何优雅的使用 laravel 的 validator

web 开发过程中经常会需要进行参数验证，laravel 中我们常用 validator 或者 request 这两种方法来进行验证，但是这两种验证都不是很方便进行自定义提示信息，自定义验证规则，所以下面来介绍一种很方便的用法：

新建抽象类

<?php

namespace App\Http\Validators;

use Validator;

abstract class AbstractValidator
{

    /**
     * Validator
     *
     * @var \Illuminate\Validation\Factory
     */
    protected $validator;

    /**
     * Validation data key => value array
     *
     * @var array
     */
    protected $data = array();

    /**
     * Validation errors
     *
     * @var array
     */
    protected $errors = array();

    /**
     * Validation rules
     *
     * @var array
     */
    protected $rules = array();

    /**
     * Validation messages
     *
     * @var array
     */
    protected $messages = array();

    /**
     * Validation codes
     *
     * @var array
     */
    protected $codes = array();

    public function __construct(array $data)
    {
        $this->data = $data;
        $this->before();
        $this->validator = Validator::make($this->data, $this->rules, $this->messages);
        $this->after();
    }

    /**
     * Set data to validate
     *
     * @return validator
     */
    public function getValidator()
    {
        return $this->validator;
    }

    /**
     * Set data to validate
     *
     * @return $this
     */
    public function with(array $data)
    {
        $this->data = $data;
        $this->before();
        $this->validator = $this->validator->make($this->data, $this->rules, $this->messages);
        $this->after();
        return $this;
    }

    /**
     * Validation passes or fails
     *
     * @return boolean
     */
    public function passes()
    {
        if ($this->validator->fails()) {
            $this->errors = $this->validator->messages();

            return false;
        }

        return true;
    }

    /**
     * Return errors, if any
     *
     * @return array
     */
    public function errors()
    {
        return $this->errors;
    }

    /**
     * Return errors codes, if any
     *
     * @return array
     */
    public function getCodes()
    {
        return $this->codes;
    }

    /**
     * getRules
     *
     * @return array
     */
    public function getRules()
    {
        return $this->rules;
    }

    /**
     * getData
     *
     * @return array
     */
    public function getData()
    {
        return $this->data;
    }

    /**
     * getErrors
     *
     * @return array
     */
    public function getErrors()
    {
        return $this->errors;
    }

    /**
     * getMessages
     *
     * @return array
     */
    public function getMessages()
    {
        return $this->messages;
    }

    /**
     * setRule
     *
     * @param string $key
     * @param string $value
     *
     * @return $this
     */
    public function setRule($key, $value)
    {
        $this->rules[$key] = $value;

        return $this;
    }

    /**
     * emptyRules
     *
     * @return $this
     */
    public function emptyRules()
    {
        $this->rules = array();

        return $this;
    }

    /**
     * sometimes
     *
     * @param  string       $attribute
     * @param  string|array $rules
     * @param  callable     $callback
     *
     * @return $this
     */
    public function sometimes($attribute, $rules, callable $callback)
    {
        $this->validator->sometimes($attribute, $rules, $callback);

        return $this;
    }

    /**
     * resolver
     *
     * @param  Closure $resolver
     *
     * @return $this
     */
    public function resolver(Closure $resolver)
    {
        Validator::resolver($resolver);

        return $this;
    }

    /**
     * replacer
     *
     * @param  Closure $resolver
     *
     * @return $this
     */
    public function replacer($replace, Closure $resolver)
    {
        Validator::replacer($replace, $resolver);

        return $this;
    }

    /**
     * extendImplicit
     *
     * @param  Closure $resolver
     *
     * @return $this
     */
    public function extendImplicit($extendImplicit, Closure $resolver)
    {
        Validator::extendImplicit($extendImplicit, $resolver);

        return $this;
    }

    /**
     * extend
     *
     * @param  string          $rule
     * @param  \Closure|string $extension
     * @param  string          $message
     *
     * @return $this
     */
    public function extend($rule, $extension, $message = null)
    {
        Validator::extend($rule, $extension, $message);

        return $this;
    }

    /**
     * before (extend(),resolver())
     *
     * @return $this
     */
    public function before()
    {
    }

    /**
     * after(sometimes())
     *
     * @return $this
     */
    public function after()
    {
    }
}

新建中间件

<?php

namespace App\Http\Middleware;

use Closure;
use \Illuminate\Http\Request;

class ValidateAdminMiddleware
{
    /**
     * This namespace is applied to the controller routes in your routes file.
     *
     * In addition, it is set as the URL generator's root namespace.
     *
     * @var string
     */
    protected $namespace = 'App\Http\Validators';

    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request $request
     * @param  \Closure                 $next
     *
     * @return mixed
     */
    public function handle(Request $request, Closure $next, $validator = null)
    {
        if ($request->isMethod('POST')) {
            $type = $request->segment(1);
            if ($validator) {
                $validator = $this->namespace . '\\' . studly_case($type) . '\\' . studly_case($validator) . 'Validator';
                $validator = new $validator($request->all());

                if (!$validator->passes()) {
                    if ($request->isAjax()) {
                        return $validator->errors()->first();
                    } else {
                        return redirect()->back()
                        ->withErrors($validator->getValidator())
                        ->withInput();
                    }
                }
            }
        }
        return $next($request);
    }
}

新建 TestTestValidator

<?php

namespace App\Http\Validators\Admin;

use App\Http\Validators\AbstractValidator;

class TestValidator extends AbstractValidator
{
    /**
     * Validation rules
     *
     * @var Array
     */
    protected $rules = array(
        'name' => ['required', 'test', 'min:1'],
    );

    /**
     * Validation messages
     *
     * @var Array
     */
    protected $messages = array(
        'name.required' => '必填',
        'name.min' => '最少1个字符',
        'name.test' => '测试',
    );

    /**
     * 自定义验证规则或者扩展Validator类
     */
    public function before()
    {
        $this->extend('test', function ($attribute, $value, $parameters) {
            return bool;
        });
    }
}

路由中如何使用

Route::post('/', ['middleware' => ['valiAdmin:Test'], 'uses' => 'IndexController@test']);

实现了验证和控制器的分离，验证更加方便、快捷
具体使用可以自行配置优化~