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Edit File: RoutingServiceProvider.php

<?php

namespace Illuminate\Routing;

use Illuminate\Contracts\Container\BindingResolutionException;
use Illuminate\Contracts\Routing\ResponseFactory as ResponseFactoryContract;
use Illuminate\Contracts\Routing\UrlGenerator as UrlGeneratorContract;
use Illuminate\Contracts\View\Factory as ViewFactoryContract;
use Illuminate\Routing\Contracts\CallableDispatcher as CallableDispatcherContract;
use Illuminate\Routing\Contracts\ControllerDispatcher as ControllerDispatcherContract;
use Illuminate\Support\ServiceProvider;
use Nyholm\Psr7\Factory\Psr17Factory;
use Nyholm\Psr7\Response as PsrResponse;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Symfony\Bridge\PsrHttpMessage\Factory\PsrHttpFactory;

class RoutingServiceProvider extends ServiceProvider
{
    /**
     * Register the service provider.
     *
     * @return void
     */
    public function register()
    {
        $this->registerRouter();
        $this->registerUrlGenerator();
        $this->registerRedirector();
        $this->registerPsrRequest();
        $this->registerPsrResponse();
        $this->registerResponseFactory();
        $this->registerCallableDispatcher();
        $this->registerControllerDispatcher();
    }

/**
     * Register the router instance.
     *
     * @return void
     */
    protected function registerRouter()
    {
        $this->app->singleton('router', function ($app) {
            return new Router($app['events'], $app);
        });
    }

/**
     * Register the URL generator service.
     *
     * @return void
     */
    protected function registerUrlGenerator()
    {
        $this->app->singleton('url', function ($app) {
            $routes = $app['router']->getRoutes();

// The URL generator needs the route collection that exists on the router.
            // Keep in mind this is an object, so we're passing by references here
            // and all the registered routes will be available to the generator.
            $app->instance('routes', $routes);

return new UrlGenerator(
                $routes, $app->rebinding(
                    'request', $this->requestRebinder()
                ), $app['config']['app.asset_url']
            );
        });

$this->app->extend('url', function (UrlGeneratorContract $url, $app) {
            // Next we will set a few service resolvers on the URL generator so it can
            // get the information it needs to function. This just provides some of
            // the convenience features to this URL generator like "signed" URLs.
            $url->setSessionResolver(function () {
                return $this->app['session'] ?? null;
            });

$url->setKeyResolver(function () {
                return $this->app->make('config')->get('app.key');
            });

// If the route collection is "rebound", for example, when the routes stay
            // cached for the application, we will need to rebind the routes on the
            // URL generator instance so it has the latest version of the routes.
            $app->rebinding('routes', function ($app, $routes) {
                $app['url']->setRoutes($routes);
            });

return $url;
        });
    }

/**
     * Get the URL generator request rebinder.
     *
     * @return \Closure
     */
    protected function requestRebinder()
    {
        return function ($app, $request) {
            $app['url']->setRequest($request);
        };
    }

/**
     * Register the Redirector service.
     *
     * @return void
     */
    protected function registerRedirector()
    {
        $this->app->singleton('redirect', function ($app) {
            $redirector = new Redirector($app['url']);

// If the session is set on the application instance, we'll inject it into
            // the redirector instance. This allows the redirect responses to allow
            // for the quite convenient "with" methods that flash to the session.
            if (isset($app['session.store'])) {
                $redirector->setSession($app['session.store']);
            }

return $redirector;
        });
    }

/**
     * Register a binding for the PSR-7 request implementation.
     *
     * @return void
     *
     * @throws \Illuminate\Contracts\Container\BindingResolutionException
     */
    protected function registerPsrRequest()
    {
        $this->app->bind(ServerRequestInterface::class, function ($app) {
            if (class_exists(Psr17Factory::class) && class_exists(PsrHttpFactory::class)) {
                $psr17Factory = new Psr17Factory;

return (new PsrHttpFactory($psr17Factory, $psr17Factory, $psr17Factory, $psr17Factory))
                    ->createRequest($app->make('request'));
            }

throw new BindingResolutionException('Unable to resolve PSR request. Please install the symfony/psr-http-message-bridge and nyholm/psr7 packages.');
        });
    }

/**
     * Register a binding for the PSR-7 response implementation.
     *
     * @return void
     *
     * @throws \Illuminate\Contracts\Container\BindingResolutionException
     */
    protected function registerPsrResponse()
    {
        $this->app->bind(ResponseInterface::class, function () {
            if (class_exists(PsrResponse::class)) {
                return new PsrResponse;
            }

throw new BindingResolutionException('Unable to resolve PSR response. Please install the nyholm/psr7 package.');
        });
    }

/**
     * Register the response factory implementation.
     *
     * @return void
     */
    protected function registerResponseFactory()
    {
        $this->app->singleton(ResponseFactoryContract::class, function ($app) {
            return new ResponseFactory($app[ViewFactoryContract::class], $app['redirect']);
        });
    }

/**
     * Register the callable dispatcher.
     *
     * @return void
     */
    protected function registerCallableDispatcher()
    {
        $this->app->singleton(CallableDispatcherContract::class, function ($app) {
            return new CallableDispatcher($app);
        });
    }

/**
     * Register the controller dispatcher.
     *
     * @return void
     */
    protected function registerControllerDispatcher()
    {
        $this->app->singleton(ControllerDispatcherContract::class, function ($app) {
            return new ControllerDispatcher($app);
        });
    }
}

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