Regular users can remove only their own tasks

app/Model/TaskPermission.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Model;
+
+/**
+ * Task permission model
+ *
+ * @package  model
+ * @author   Frederic Guillot
+ */
+class TaskPermission extends Base
+{
+    /**
+     * Return true if the user can remove a task
+     *
+     * Regular users can't remove tasks from other people
+     *
+     * @public
+     * @return boolean
+     */
+    public function canRemoveTask(array $task)
+    {
+        if ($this->acl->isAdminUser()) {
+            return true;
+        }
+        else if (isset($task['creator_id']) && $task['creator_id'] == $this->acl->getUserId()) {
+            return true;
+        }
+
+        return false;
+    }
+}