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libraries/fof30/Controller/Mixin/PredefinedTaskList.php

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+<?php
+/**
+ * @package   FOF
+ * @copyright Copyright (c)2010-2021 Nicholas K. Dionysopoulos / Akeeba Ltd
+ * @license   GNU General Public License version 2, or later
+ */
+
+namespace FOF30\Controller\Mixin;
+
+defined('_JEXEC') || die;
+
+use FOF30\Controller\Controller;
+
+/**
+ * Force a Controller to allow access to specific tasks only, no matter which tasks are already defined in this
+ * Controller.
+ *
+ * Include this Trait and then in your constructor do this:
+ * $this->setPredefinedTaskList(['atask', 'anothertask', 'something']);
+ *
+ * WARNING: If you override execute() you will need to copy the logic from this trait's execute() method.
+ */
+trait PredefinedTaskList
+{
+
+	/**
+	 * A list of predefined tasks. Trying to access any other task will result in the first task of this list being
+	 * executed instead.
+	 *
+	 * @var array
+	 */
+	protected $predefinedTaskList = [];
+
+	/**
+	 * Overrides the execute method to implement the predefined task list feature
+	 *
+	 * @param   string  $task  The task to execute
+	 *
+	 * @return  mixed   The controller task result
+	 */
+	public function execute($task)
+	{
+		if (!in_array($task, $this->predefinedTaskList))
+		{
+			$task = reset($this->predefinedTaskList);
+		}
+
+		return parent::execute($task);
+	}
+
+	/**
+	 * Sets the predefined task list and registers the first task in the list as the Controller's default task
+	 *
+	 * @param   array  $taskList  The task list to register
+	 *
+	 * @return  void
+	 */
+	public function setPredefinedTaskList(array $taskList)
+	{
+		/** @var Controller $this */
+
+		// First, unregister all known tasks which are not in the taskList
+		$allTasks = $this->getTasks();
+
+		foreach ($allTasks as $task)
+		{
+			if (in_array($task, $taskList))
+			{
+				continue;
+			}
+
+			$this->unregisterTask($task);
+		}
+
+		// Set the predefined task list
+		$this->predefinedTaskList = $taskList;
+
+		// Set the default task
+		$this->registerDefaultTask(reset($this->predefinedTaskList));
+
+	}
+}