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formrequest.html
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<!DOCTYPE html>
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<h2 class="post-title" itemprop="name headline">FormRequest类</h2>
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<p>探究request请求中，表单自动验证的实现原理。<br>①任意建一个控制器,如IndexController，添加index方法</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">namespace</span> <span class="title">App</span>\<span class="title">Http</span>\<span class="title">Controllers</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">use</span> <span class="title">App</span>\<span class="title">Http</span>\<span class="title">Requests</span>\<span class="title">IndexRequest</span>;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">IndexController</span> <span class="keyword">extends</span> <span class="title">Controller</span></span></span><br><span class="line"><span class="class"></span>{ </span><br><span class="line"> <span class="comment">//通过依赖注入进行InputRequest类的实例化</span></span><br><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">index</span><span class="params">(IndexRequest $request)</span></span></span><br><span class="line"><span class="function"> </span>{ </span><br><span class="line"> dump($request);</span><br><span class="line"> <span class="comment">// echo 123;</span></span><br><span class="line"> } </span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>@任意建一个继承了FormRequest类的类,如IndexRequest<br><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">namespace</span> <span class="title">App</span>\<span class="title">Http</span>\<span class="title">Requests</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">use</span> <span class="title">Illuminate</span>\<span class="title">Foundation</span>\<span class="title">Http</span>\<span class="title">FormRequest</span>;</span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">IndexRequest</span> <span class="keyword">extends</span> <span class="title">FormRequest</span></span></span><br><span class="line"><span class="class"></span>{ </span><br><span class="line"> <span class="comment">// public $redirect = '/home';</span></span><br><span class="line"> <span class="comment">// public $redirectAction = 'IndexController@test';</span></span><br><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">authorize</span><span class="params">()</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> <span class="keyword">return</span> <span class="keyword">true</span>;</span><br><span class="line"> }</span><br><span class="line"> <span class="comment">//这里请求参数id 是必须的</span></span><br><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">rules</span><span class="params">()</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> <span class="keyword">return</span> [</span><br><span class="line"> <span class="string">'id'</span> => <span class="string">'required'</span></span><br><span class="line"> ];</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure><br><a id="more"></a></p>
<h5 id="如何自动验证"><a href="#如何自动验证" class="headerlink" title="如何自动验证"></a>如何自动验证</h5><p>在IndexController中依赖注入，说白了就是通过容器make()方法获取实例,那么验证又是在哪里,以怎样的方式触发的呢<br>在框架config的app.php 中有很多服务注册,这里主要用到的一个服务就是</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//app.php</span></span><br><span class="line">...</span><br><span class="line">Illuminate\Validation\ValidationServiceProvider::class,</span><br><span class="line">...</span><br><span class="line"></span><br><span class="line"><span class="comment">//ValidationServiceProvider</span></span><br><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">register</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">$this</span>->registerValidationResolverHook();</span><br><span class="line"> ....</span><br><span class="line">}</span><br><span class="line"> <span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">registerValidationResolverHook</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">$this</span>->app->afterResolving(<span class="function"><span class="keyword">function</span> <span class="params">(ValidatesWhenResolved $resolved)</span> </span>{</span><br><span class="line"> $resolved->validate();</span><br><span class="line"> });</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>这里注册了一个全局的afterResolving 回调，看一下afterResolving都做了什么<br><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">afterResolving</span><span class="params">($abstract, Closure $callback = null)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">if</span> ($abstract <span class="keyword">instanceof</span> Closure && $callback === <span class="keyword">null</span>) {</span><br><span class="line"> <span class="keyword">$this</span>->afterResolvingCallback($abstract);</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">$this</span>->afterResolvingCallbacks[$abstract][] = $callback;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"><span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">resolvingCallback</span><span class="params">(Closure $callback)</span></span></span><br><span class="line"><span class="function"></span>{ </span><br><span class="line"> <span class="comment">//这里的abstract就是类的全名</span></span><br><span class="line"> <span class="comment">//Illuminate\Contracts\Validation\ValidatesWhenResolved</span></span><br><span class="line"> $abstract = <span class="keyword">$this</span>->getFunctionHint($callback);</span><br><span class="line"> <span class="keyword">if</span> ($abstract) {</span><br><span class="line"> <span class="keyword">$this</span>->resolvingCallbacks[$abstract][] = $callback;</span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> <span class="keyword">$this</span>->globalResolvingCallbacks[] = $callback;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<p>可以看到 为app类的resolvingCallbacks数组中添加了一个ValidatesWhenResolved指向的闭包，也就是上面的<br>function (ValidatesWhenResolved $resolved) { $resolved->validate(); }</p>
<h5 id="验证触发"><a href="#验证触发" class="headerlink" title="验证触发"></a>验证触发</h5><p>真正的验证是在 Container类执行make(‘\App\Http\Requests\IndexRequest’)时触发的。</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//容器的make方法</span></span><br><span class="line">...</span><br><span class="line"><span class="keyword">$this</span>->fireResolvingCallbacks($abstract, $object);</span><br><span class="line">...</span><br><span class="line"></span><br><span class="line"><span class="comment">//</span></span><br><span class="line"> <span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">fireResolvingCallbacks</span><span class="params">($abstract, $object)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">$this</span>->fireCallbackArray(</span><br><span class="line"> $object, <span class="keyword">$this</span>->getCallbacksForType(</span><br><span class="line"> <span class="comment">//获取afterresolving回调</span></span><br><span class="line"> $abstract, $object, <span class="keyword">$this</span>->afterResolvingCallbacks</span><br><span class="line"> )</span><br><span class="line"> );</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">//为所有的回调函数传入当前Object(这里便是InputRequest) 和 app实例</span></span><br><span class="line"><span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">fireCallbackArray</span><span class="params">($object, array $callbacks)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">foreach</span> ($callbacks <span class="keyword">as</span> $callback) {</span><br><span class="line"> $callback($object, <span class="keyword">$this</span>);</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>容器在make 任意类时都去获取全局的afterResolvingCallbacks,但是会根据指定类型进行回调，其他则直接过滤。下面这个方法则会获取当前make类对应的回调。<br>当$type恒等于 $abstract 或者 $object instanceof $type,<br>在当前例子下便是<br>‘App\Http\Requests\IndexRequest’ === ‘Illuminate\Contracts\Validation\ValidatesWhenResolved’ 不成立<br>Object(App\Http\Requests\IndexRequest) instanceof Object(ValidatesWhenResolved) 成立<br>因为InputRequest是继承FormRquest的,FormRquest又实现ValidatesWhenResolved接口</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">getCallbacksForType</span><span class="params">($abstract, $object, array $callbacksPerType)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> $results = [];</span><br><span class="line"></span><br><span class="line"> <span class="keyword">foreach</span> ($callbacksPerType <span class="keyword">as</span> $type => $callbacks) {</span><br><span class="line"> <span class="keyword">if</span> ($type === $abstract || $object <span class="keyword">instanceof</span> $type) {</span><br><span class="line"> $results = array_merge($results, $callbacks);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> <span class="keyword">return</span> $results;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>以上代码都执行完毕后，最终的执行代码就是 InputRequest->validate()。进而执行FormRequest中Trait类的validate方法。接下来便是最基本的验证流程了<br><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// FormRequest 类</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">FormRequest</span> <span class="keyword">extends</span> <span class="title">Request</span> <span class="keyword">implements</span> <span class="title">ValidatesWhenResolved</span></span></span><br><span class="line"><span class="class"></span>{</span><br><span class="line"> <span class="keyword">use</span> <span class="title">ValidatesWhenResolvedTrait</span>;</span><br><span class="line">}</span><br><span class="line"><span class="comment">// </span></span><br><span class="line"><span class="keyword">trait</span> ValidatesWhenResolvedTrait</span><br><span class="line">{</span><br><span class="line"> <span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">validate</span><span class="params">()</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> $instance = <span class="keyword">$this</span>->getValidatorInstance();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">if</span> (! <span class="keyword">$this</span>->passesAuthorization()) {</span><br><span class="line"> <span class="keyword">$this</span>->failedAuthorization();</span><br><span class="line"> } <span class="keyword">elseif</span> (! $instance->passes()) {</span><br><span class="line"> <span class="keyword">$this</span>->failedValidation($instance);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>
<h5 id="FromRequest获取"><a href="#FromRequest获取" class="headerlink" title="FromRequest获取"></a>FromRequest获取</h5><p>首先这个FromRequest类有对应的服务提供者,在config/app.php 的 providers数组中<br><figure class="highlight clean"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="string">'providers'</span> => [</span><br><span class="line"> ...</span><br><span class="line"> Illuminate\Foundation\Providers\FoundationServiceProvider::<span class="keyword">class</span>,</span><br><span class="line"> ...</span><br><span class="line">]</span><br></pre></td></tr></table></figure><br>然后在FoundationServiceProvider的provides中存在<br><figure class="highlight scala"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">FoundationServiceProvider</span> <span class="keyword">extends</span> <span class="title">AggregateServiceProvider</span></span></span><br><span class="line"><span class="class"></span>{</span><br><span class="line"> <span class="keyword">protected</span> $providers = [</span><br><span class="line"> <span class="type">FormRequestServiceProvider</span>::<span class="class"><span class="keyword">class</span>,</span></span><br><span class="line"><span class="class"> ]</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure><br>在框架的bootstrap过程中，所有的服务都会进行一一注册。接下开便是register</p>
<figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// AggregateServiceProvider </span></span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">register</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">$this</span>->instances = [];</span><br><span class="line"></span><br><span class="line"> <span class="keyword">foreach</span> (<span class="keyword">$this</span>->providers <span class="keyword">as</span> $provider) {</span><br><span class="line"></span><br><span class="line"> <span class="keyword">$this</span>->instances[] = <span class="keyword">$this</span>->app->register($provider);</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br></pre></td></tr></table></figure>
<h5 id="FormRequest与Request"><a href="#FormRequest与Request" class="headerlink" title="FormRequest与Request"></a>FormRequest与Request</h5><p>所有请求参数最开始实际都是只存在Request类中，但是IndexController中的InputRequest类有其所有数据。底层实现原理与上面验证比较类似。<br>当所有服务注册完毕,逐个执行其boot方法，为项目启动做准备时， 这里就注册了一个router.matched的事件监听者，也就是当请求url匹配到存在路由时,触发回调。<br><figure class="highlight php"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//FormRequestServiceProvider</span></span><br><span class="line"><span class="keyword">public</span> <span class="function"><span class="keyword">function</span> <span class="title">boot</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> <span class="keyword">$this</span>->app[<span class="string">'events'</span>]->listen(<span class="string">'router.matched'</span>, <span class="function"><span class="keyword">function</span> <span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">$this</span>->app->resolving(<span class="function"><span class="keyword">function</span> <span class="params">(FormRequest $request, $app)</span> </span>{</span><br><span class="line"></span><br><span class="line"> <span class="keyword">$this</span>->initializeRequest($request, $app[<span class="string">'request'</span>]);</span><br><span class="line"></span><br><span class="line"> $request->setContainer($app)->setRedirector($app->make(Redirector::class));</span><br><span class="line"> });</span><br><span class="line"> });</span><br><span class="line">}</span><br><span class="line"><span class="keyword">protected</span> <span class="function"><span class="keyword">function</span> <span class="title">initializeRequest</span><span class="params">(FormRequest $form, Request $current)</span></span></span><br><span class="line"><span class="function"> </span>{</span><br><span class="line"> $files = $current->files->all();</span><br><span class="line"></span><br><span class="line"> $files = is_array($files) ? array_filter($files) : $files;</span><br><span class="line"></span><br><span class="line"> $form->initialize(</span><br><span class="line"> $current->query->all(), $current->request->all(), $current->attributes->all(),</span><br><span class="line"> $current->cookies->all(), $files, $current->server->all(), $current->getContent()</span><br><span class="line"> );</span><br><span class="line"> </span><br><span class="line"> <span class="keyword">if</span> ($session = $current->getSession()) {</span><br><span class="line"> $form->setSession($session);</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> $form->setUserResolver($current->getUserResolver());</span><br><span class="line"></span><br><span class="line"> $form->setRouteResolver($current->getRouteResolver());</span><br><span class="line"> }</span><br></pre></td></tr></table></figure><br>这个回调的最终目的就是 将原Request类中的所有属性为InputRequest复制一份。包括设置获取user及route的回调,如 基本写法request()->user(), 通过依赖注入后$inputrequest->user() 也可实现该效果.</p>
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