Move custom redirector to core

This was previously found in the User plugin and is a black box; nearly impossible to find from the `Redirect` facade, the `october\rain` library should  provide an interface to change the key name, that is, if Laravel doesn't add this common feature in a later version

src/Foundation/Application.php

@@ -327,7 +327,7 @@ public function registerCoreContainerAliases()
             'cache.psr6' => [\Symfony\Component\Cache\Adapter\Psr16Adapter::class, \Symfony\Component\Cache\Adapter\AdapterInterface::class, \Psr\Cache\CacheItemPoolInterface::class],
             'config' => [\Illuminate\Config\Repository::class, \Illuminate\Contracts\Config\Repository::class],
             'cookie' => [\Illuminate\Cookie\CookieJar::class, \Illuminate\Contracts\Cookie\Factory::class, \Illuminate\Contracts\Cookie\QueueingFactory::class],
-            'db' => [\October\Rain\Database\DatabaseManager::class],
+            'db' => [\Illuminate\Database\DatabaseManager::class],
             'db.connection' => [\Illuminate\Database\Connection::class, \Illuminate\Database\ConnectionInterface::class],
             'db.schema' => [\Illuminate\Database\Schema\Builder::class],
             'encrypter' => [\Illuminate\Encryption\Encrypter::class, \Illuminate\Contracts\Encryption\Encrypter::class],
@@ -347,7 +347,7 @@ public function registerCoreContainerAliases()
             'queue' => [\Illuminate\Queue\QueueManager::class, \Illuminate\Contracts\Queue\Factory::class, \Illuminate\Contracts\Queue\Monitor::class],
             'queue.connection' => [\Illuminate\Contracts\Queue\Queue::class],
             'queue.failer' => [\Illuminate\Queue\Failed\FailedJobProviderInterface::class],
-            'redirect' => [\Illuminate\Routing\Redirector::class],
+            'redirect' => [\October\Rain\Router\CoreRedirector::class],
             'redis' => [\Illuminate\Redis\RedisManager::class, \Illuminate\Contracts\Redis\Factory::class],
             'redis.connection' => [\Illuminate\Redis\Connections\Connection::class, \Illuminate\Contracts\Redis\Connection::class],
             'request' => [\Illuminate\Http\Request::class, \Symfony\Component\HttpFoundation\Request::class],

src/Router/CoreRedirector.php

@@ -0,0 +1,54 @@
+<?php namespace October\Rain\Router;
+
+use App;
+use Illuminate\Routing\Redirector as RedirectorBase;
+
+/**
+ * CoreRedirector adds extra events to the base redirector and ensures the "intended"
+ * session is different for the frontend and backend contexts.
+ *
+ * @package october\router
+ * @author Alexey Bobkov, Samuel Georges
+ */
+class CoreRedirector extends RedirectorBase
+{
+    /**
+     * intended creates a new redirect response to the previously intended location.
+     * @return \Illuminate\Http\RedirectResponse
+     */
+    public function intended($default = '/', $status = 302, $headers = [], $secure = null)
+    {
+        if (!App::runningInFrontend()) {
+            return parent::intended($default, $status, $headers, $secure);
+        }
+
+        $path = $this->session->pull('url.cms.intended', $default);
+
+        return $this->to($path, $status, $headers, $secure);
+    }
+
+    /**
+     * getIntendedUrl from the session.
+     */
+    public function getIntendedUrl()
+    {
+        if (!App::runningInFrontend()) {
+            return parent::getIntendedUrl();
+        }
+
+        return $this->session->get('url.cms.intended');
+    }
+
+    /**
+     * setIntendedUrl in the session.
+     */
+    public function setIntendedUrl($url)
+    {
+        if (!App::runningInFrontend()) {
+            return parent::setIntendedUrl($url);
+        }
+
+        $this->session->put('url.cms.intended', $url);
+        return $this;
+    }
+}

src/Router/RoutingServiceProvider.php

@@ -45,4 +45,23 @@ protected function registerRouter()
             return new CoreRouter($app['events'], $app);
         });
     }
+
+    /**
+     * registerRedirector
+     */
+    protected function registerRedirector()
+    {
+        $this->app->singleton('redirect', function ($app) {
+            $redirector = new CoreRedirector($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;
+        });
+    }
 }