Added permission system

app/Http/Controllers/Controller.php

@@ -2,27 +2,69 @@
 
 namespace Oxbow\Http\Controllers;
 
+use HttpRequestException;
 use Illuminate\Foundation\Bus\DispatchesJobs;
+use Illuminate\Http\Exception\HttpResponseException;
 use Illuminate\Routing\Controller as BaseController;
 use Illuminate\Foundation\Validation\ValidatesRequests;
 use Illuminate\Support\Facades\Auth;
+use Illuminate\Support\Facades\Session;
 use Oxbow\User;
 
 abstract class Controller extends BaseController
 {
     use DispatchesJobs, ValidatesRequests;
 
+    /**
+     * @var User static
+     */
+    protected $currentUser;
+    /**
+     * @var bool
+     */
+    protected $signedIn;
+
     /**
      * Controller constructor.
      */
     public function __construct()
     {
-        view()->share('signedIn', Auth::check());
+        // Get a user instance for the current user
         $user = Auth::user();
-        if(!$user) {
+        if (!$user) {
             $user = User::getDefault();
         }
-        view()->share('user', $user);
+        // Share variables with views
+        view()->share('signedIn', Auth::check());
+        view()->share('currentUser', $user);
+        // Share variables with controllers
+        $this->currentUser = $user;
+        $this->signedIn = Auth::check();
+    }
+
+    /**
+     * Checks for a permission.
+     *
+     * @param $permissionName
+     * @return bool|\Illuminate\Http\RedirectResponse
+     */
+    protected function checkPermission($permissionName)
+    {
+        if (!$this->currentUser || !$this->currentUser->can($permissionName)) {
+            Session::flash('error', trans('errors.permission'));
+            throw new HttpResponseException(
+                redirect()->back()
+            );
+        }
+
+        return true;
+    }
+
+    protected function checkPermissionOr($permissionName, $callback)
+    {
+        $callbackResult = $callback();
+        if ($callbackResult === false) $this->checkPermission($permissionName);
+        return true;
     }
 
 }