X-Git-Url: http://source.bookstackapp.com/bookstack/blobdiff_plain/c32d70abc4f3cca4a8b3533d45b09d2a830d6a57..42d8e9e5bda57a26bbaa3f6e4a9e4e5f94a341e7:/app/Http/Controllers/Controller.php

diff --git a/app/Http/Controllers/Controller.php b/app/Http/Controllers/Controller.php
index 5dc79eb02..43292d941 100644
--- a/app/Http/Controllers/Controller.php
+++ b/app/Http/Controllers/Controller.php
@@ -2,6 +2,7 @@
 
 namespace BookStack\Http\Controllers;
 
+use BookStack\Ownable;
 use HttpRequestException;
 use Illuminate\Foundation\Bus\DispatchesJobs;
 use Illuminate\Http\Exception\HttpResponseException;
@@ -29,17 +30,31 @@ abstract class Controller extends BaseController
      */
     public function __construct()
     {
-        // Get a user instance for the current user
-        $user = auth()->user();
-        if (!$user) $user = User::getDefault();
+        $this->middleware(function ($request, $next) {
 
-        // Share variables with views
-        view()->share('signedIn', auth()->check());
-        view()->share('currentUser', $user);
+            // Get a user instance for the current user
+            $user = auth()->user();
+            if (!$user) $user = User::getDefault();
 
-        // Share variables with controllers
-        $this->currentUser = $user;
-        $this->signedIn = auth()->check();
+            // Share variables with views
+            view()->share('signedIn', auth()->check());
+            view()->share('currentUser', $user);
+
+            // Share variables with controllers
+            $this->currentUser = $user;
+            $this->signedIn = auth()->check();
+
+            return $next($request);
+        });
+    }
+
+    /**
+     * Stops the application and shows a permission error if
+     * the application is in demo mode.
+     */
+    protected function preventAccessForDemoUsers()
+    {
+        if (config('app.env') === 'demo') $this->showPermissionError();
     }
 
     /**
@@ -51,24 +66,48 @@ abstract class Controller extends BaseController
         view()->share('pageTitle', $title);
     }
 
+    /**
+     * On a permission error redirect to home and display.
+     * the error as a notification.
+     */
+    protected function showPermissionError()
+    {
+        Session::flash('error', trans('errors.permission'));
+        $response = request()->wantsJson() ? response()->json(['error' => trans('errors.permissionJson')], 403) : redirect('/');
+        throw new HttpResponseException($response);
+    }
+
     /**
      * Checks for a permission.
-     *
-     * @param $permissionName
+     * @param string $permissionName
      * @return bool|\Illuminate\Http\RedirectResponse
      */
     protected function checkPermission($permissionName)
     {
         if (!$this->currentUser || !$this->currentUser->can($permissionName)) {
-            Session::flash('error', trans('errors.permission'));
-            throw new HttpResponseException(
-                redirect('/')
-            );
+            $this->showPermissionError();
         }
-
         return true;
     }
 
+    /**
+     * Check the current user's permissions against an ownable item.
+     * @param $permission
+     * @param Ownable $ownable
+     * @return bool
+     */
+    protected function checkOwnablePermission($permission, Ownable $ownable)
+    {
+        if (userCan($permission, $ownable)) return true;
+        return $this->showPermissionError();
+    }
+
+    /**
+     * Check if a user has a permission or bypass if the callback is true.
+     * @param $permissionName
+     * @param $callback
+     * @return bool
+     */
     protected function checkPermissionOr($permissionName, $callback)
     {
         $callbackResult = $callback();
@@ -76,4 +115,15 @@ abstract class Controller extends BaseController
         return true;
     }
 
+    /**
+     * Send back a json error message.
+     * @param string $messageText
+     * @param int $statusCode
+     * @return mixed
+     */
+    protected function jsonError($messageText = "", $statusCode = 500)
+    {
+        return response()->json(['message' => $messageText], $statusCode);
+    }
+
 }