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administrator/components/com_scheduler/src/Controller/DisplayController.php

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+<?php
+
+/**
+ * @package     Joomla.Administrator
+ * @subpackage  com_scheduler
+ *
+ * @copyright   (C) 2021 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+namespace Joomla\Component\Scheduler\Administrator\Controller;
+
+use Joomla\CMS\Language\Text;
+use Joomla\CMS\MVC\Controller\BaseController;
+use Joomla\CMS\Router\Route;
+
+// phpcs:disable PSR1.Files.SideEffects
+\defined('_JEXEC') or die;
+// phpcs:enable PSR1.Files.SideEffects
+
+/**
+ * Default controller for com_scheduler.
+ *
+ * @since  4.1.0
+ */
+class DisplayController extends BaseController
+{
+    /**
+     * @var   string
+     * @since  4.1.0
+     */
+    protected $default_view = 'tasks';
+
+    /**
+     * @param   boolean  $cachable   If true, the view output will be cached
+     * @param   array    $urlparams  An array of safe url parameters and their variable types.
+     *                   @see        \Joomla\CMS\Filter\InputFilter::clean() for valid values.
+     *
+     * @return BaseController|boolean  Returns either a BaseController object to support chaining, or false on failure
+     *
+     * @since  4.1.0
+     * @throws \Exception
+     */
+    public function display($cachable = false, $urlparams = [])
+    {
+        $layout = $this->input->get('layout', 'default');
+
+        // Check for edit form.
+        if ($layout === 'edit') {
+            if (!$this->validateEntry()) {
+                $tasksViewUrl = Route::_('index.php?option=com_scheduler&view=tasks', false);
+                $this->setRedirect($tasksViewUrl);
+
+                return false;
+            }
+        }
+
+        // Let the parent method take over
+        return parent::display($cachable, $urlparams);
+    }
+
+    /**
+     * Validates entry to the view
+     *
+     * @param   string  $layout  The layout to validate entry for (defaults to 'edit')
+     *
+     * @return boolean  True is entry is valid
+     *
+     * @since  4.1.0
+     */
+    private function validateEntry(string $layout = 'edit'): bool
+    {
+        $context = 'com_scheduler';
+        $id      = $this->input->getInt('id');
+        $isValid = true;
+
+        switch ($layout) {
+            case 'edit':
+                // True if controller was called and verified permissions
+                $inEditList = $this->checkEditId("$context.edit.task", $id);
+                $isNew      = ($id == 0);
+
+                // For new item, entry is invalid if task type was not selected through SelectView
+                if ($isNew && !$this->app->getUserState("$context.add.task.task_type")) {
+                    $this->setMessage((Text::_('COM_SCHEDULER_ERROR_FORBIDDEN_JUMP_TO_ADD_VIEW')), 'error');
+                    $isValid = false;
+                } elseif (!$inEditList) {
+                    // For existing item, entry is invalid if TaskController has not granted access
+                    if (!\count($this->app->getMessageQueue())) {
+                        $this->setMessage(Text::sprintf('JLIB_APPLICATION_ERROR_UNHELD_ID', $id), 'error');
+                    }
+
+                    $isValid = false;
+                }
+                break;
+            default:
+                break;
+        }
+
+        return $isValid;
+    }
+}