暂存

vendor/illuminate/http/Middleware/TrustHosts.php

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+<?php
+
+namespace Illuminate\Http\Middleware;
+
+use Illuminate\Contracts\Foundation\Application;
+use Illuminate\Http\Request;
+
+class TrustHosts
+{
+    /**
+     * The application instance.
+     *
+     * @var \Illuminate\Contracts\Foundation\Application
+     */
+    protected $app;
+
+    /**
+     * The trusted hosts that have been configured to always be trusted.
+     *
+     * @var array<int, string>|(callable(): array<int, string>)|null
+     */
+    protected static $alwaysTrust;
+
+    /**
+     * Indicates whether subdomains of the application URL should be trusted.
+     *
+     * @var bool|null
+     */
+    protected static $subdomains;
+
+    /**
+     * Create a new middleware instance.
+     *
+     * @param  \Illuminate\Contracts\Foundation\Application  $app
+     */
+    public function __construct(Application $app)
+    {
+        $this->app = $app;
+    }
+
+    /**
+     * Get the host patterns that should be trusted.
+     *
+     * @return array
+     */
+    public function hosts()
+    {
+        if (is_null(static::$alwaysTrust)) {
+            return [$this->allSubdomainsOfApplicationUrl()];
+        }
+
+        $hosts = match (true) {
+            is_array(static::$alwaysTrust) => static::$alwaysTrust,
+            is_callable(static::$alwaysTrust) => call_user_func(static::$alwaysTrust),
+            default => [],
+        };
+
+        if (static::$subdomains) {
+            $hosts[] = $this->allSubdomainsOfApplicationUrl();
+        }
+
+        return $hosts;
+    }
+
+    /**
+     * Handle the incoming request.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @param  \Closure  $next
+     * @return \Illuminate\Http\Response
+     */
+    public function handle(Request $request, $next)
+    {
+        if ($this->shouldSpecifyTrustedHosts()) {
+            Request::setTrustedHosts(array_filter($this->hosts()));
+        }
+
+        return $next($request);
+    }
+
+    /**
+     * Specify the hosts that should always be trusted.
+     *
+     * @param  array<int, string>|(callable(): array<int, string>)  $hosts
+     * @param  bool  $subdomains
+     * @return void
+     */
+    public static function at(array|callable $hosts, bool $subdomains = true)
+    {
+        static::$alwaysTrust = $hosts;
+        static::$subdomains = $subdomains;
+    }
+
+    /**
+     * Determine if the application should specify trusted hosts.
+     *
+     * @return bool
+     */
+    protected function shouldSpecifyTrustedHosts()
+    {
+        return ! $this->app->environment('local') &&
+               ! $this->app->runningUnitTests();
+    }
+
+    /**
+     * Get a regular expression matching the application URL and all of its subdomains.
+     *
+     * @return string|null
+     */
+    protected function allSubdomainsOfApplicationUrl()
+    {
+        if ($host = parse_url($this->app['config']->get('app.url'), PHP_URL_HOST)) {
+            return '^(.+\.)?'.preg_quote($host).'$';
+        }
+    }
+
+    /**
+     * Flush the state of the middleware.
+     *
+     * @return void
+     */
+    public static function flushState()
+    {
+        static::$alwaysTrust = null;
+        static::$subdomains = null;
+    }
+}