Do some more injection on filters.

app/Http/Filters/AuthFilter.php

@@ -2,30 +2,59 @@
 
 use Illuminate\Http\Request;
 use Illuminate\Routing\Route;
-use Auth, Redirect, Response;
+use Illuminate\Contracts\Auth\Authenticator;
+use Illuminate\Contracts\Routing\ResponseFactory;
 
 class AuthFilter {
 
-	/**
-	 * Run the request filter.
-	 *
-	 * @param  \Illuminate\Routing\Route  $route
-	 * @param  \Illuminate\Http\Request  $request
-	 * @return mixed
-	 */
-	public function filter(Route $route, Request $request)
-	{
-		if (Auth::guest())
-		{
-			if ($request->ajax())
-			{
-				return Response::make('Unauthorized', 401);
-			}
-			else
-			{
-				return Redirect::guest('auth/login');
-			}
-		}
-	}
+    /**
+     * The authenticator implementation.
+     *
+     * @var Authenticator
+     */
+    protected $auth;
+
+    /**
+     * The response factory implementation.
+     *
+     * @var ResponseFactory
+     */
+    protected $response;
+
+    /**
+     * Create a new filter instance.
+     *
+     * @param  Authenticator  $auth
+     * @param  ResponseFactory  $response
+     * @return void
+     */
+    public function __construct(Authenticator $auth,
+                                ResponseFactory $response)
+    {
+        $this->auth = $auth;
+        $this->response = $response;
+    }
+
+    /**
+     * Run the request filter.
+     *
+     * @param  \Illuminate\Routing\Route  $route
+     * @param  \Illuminate\Http\Request  $request
+     * @return mixed
+     */
+    public function filter(Route $route, Request $request)
+    {
+        if ($this->auth->guest())
+        {
+            if ($request->ajax())
+            {
+                return $this->response->make('Unauthorized', 401);
+            }
+            else
+            {
+                return $this->response->redirectGuest('auth/login');
+            }
+        }
+    }
 
 }

app/Http/Filters/BasicAuthFilter.php

 <?php namespace App\Http\Filters;
 
-use Auth;
+use Illuminate\Contracts\Auth\Authenticator;
 
 class BasicAuthFilter {
 
 	/**
+	 * The authenticator implementation.
+	 *
+	 * @var Authenticator
+	 */
+	protected $auth;
+
+	/**
+	 * Create a new filter instance.
+	 *
+	 * @param  Authenticator  $auth
+	 * @return void
+	 */
+	public function __construct(Authenticator $auth)
+	{
+		$this->auth = $auth;
+	}
+
+	/**
 	 * Run the request filter.
 	 *
 	 * @return mixed
 	 */
 	public function filter()
 	{
-		return Auth::basic();
+		return $this->auth->basic();
 	}
 
-}
\ No newline at end of file
+}

app/Http/Filters/CsrfFilter.php

 <?php namespace App\Http\Filters;
 
-use Session;
 use Illuminate\Http\Request;
 use Illuminate\Routing\Route;
 use Illuminate\Session\TokenMismatchException;
@@ -13,12 +12,12 @@ class CsrfFilter {
 	 * @param  \Illuminate\Routing\Route  $route
 	 * @param  \Illuminate\Http\Request  $request
 	 * @return void
-	 * 
+	 *
 	 * @throws \Illuminate\Session\TokenMismatchException
 	 */
 	public function filter(Route $route, Request $request)
 	{
-		if (Session::token() != $request->input('_token'))
+		if ($request->getSession()->token() != $request->input('_token'))
 		{
 			throw new TokenMismatchException;
 		}

app/Http/Filters/GuestFilter.php

-<?php namespace App\Http\Filters;
-
-use Auth, Redirect;
-
-class GuestFilter {
-
-	/**
-	 * Run the request filter.
-	 *
-	 * @return mixed
-	 */
-	public function filter()
-	{
-		if (Auth::check())
-		{
-			return Redirect::to('/');
-		}
-	}
-
-}
\ No newline at end of file

app/Http/Filters/MaintenanceFilter.php

 <?php namespace App\Http\Filters;
 
-use App, Response;
+use Illuminate\Contracts\Foundation\Application;
+use Illuminate\Contracts\Routing\ResponseFactory;
 
 class MaintenanceFilter {
 
 	/**
+	 * The application implementation.
+	 *
+	 * @var Application
+	 */
+	protected $app;
+
+    /**
+     * The response factory implementation.
+     *
+     * @var ResponseFactory
+     */
+    protected $response;
+
+	/**
+	 * Create a new filter instance.
+	 *
+	 * @param  Application  $app
+	 * @return void
+	 */
+	public function __construct(Application $app, ResponseFactory $response)
+	{
+		$this->app = $app;
+		$this->response = $response;
+	}
+
+	/**
 	 * Run the request filter.
 	 *
 	 * @return mixed
 	 */
 	public function filter()
 	{
-		if (App::isDownForMaintenance())
+		if ($this->app->isDownForMaintenance())
 		{
-			return Response::make('Be right back!');
+			return $this->response->make('Be right back!', 503);
 		}
 	}