editing with shared items in public

app/Http/Tools/Guardian.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace App\Http\Tools;
+
+use App;
+use App\FileManagerFolder;
+use Illuminate\Support\Arr;
+
+
+class Guardian
+{
+    /**
+     * Check access to requested directory
+     *
+     * @param integer|array $requested_id
+     * @param string $shared Shared record detail
+     */
+    public static function check_item_access($requested_id, $shared)
+    {
+        // Get all children folders
+        $foldersIds = FileManagerFolder::with('folders:id,parent_id,unique_id,name')
+            ->where('user_id', $shared->user_id)
+            ->where('parent_id', $shared->item_id)
+            ->get();
+
+        // Get all authorized parent folders by shared folder as root of tree
+        $accessible_folder_ids = Arr::flatten([filter_folders_ids($foldersIds), $shared->item_id]);
+
+        // Check user access
+        if ( is_array($requested_id) ) {
+            foreach ($requested_id as $id) {
+                if (!in_array($id, $accessible_folder_ids))
+                    abort(403);
+            }
+        }
+
+        if (! is_array($requested_id)) {
+            if (! in_array($requested_id, $accessible_folder_ids))
+                abort(403);
+        }
+    }
+}