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typo3/sysext/install/Classes/Updates/FuncExtractionUpdate.php

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+<?php
+namespace TYPO3\CMS\Install\Updates;
+
+/*
+ * This file is part of the TYPO3 CMS project.
+ *
+ * It is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License, either version 2
+ * of the License, or any later version.
+ *
+ * For the full copyright and license information, please read the
+ * LICENSE.txt file that was distributed with this source code.
+ *
+ * The TYPO3 project - inspiring people to share!
+ */
+
+use TYPO3\CMS\Core\Utility\ExtensionManagementUtility;
+
+/**
+ * Installs and downloads EXT:func
+ * @internal This class is only meant to be used within EXT:install and is not part of the TYPO3 Core API.
+ */
+class FuncExtractionUpdate extends AbstractDownloadExtensionUpdate
+{
+
+    /**
+     * @var \TYPO3\CMS\Install\Updates\Confirmation
+     */
+    protected $confirmation;
+
+    public function __construct()
+    {
+        $this->extension = new ExtensionModel(
+            'func',
+            'Web->Functions module',
+            '9.0.1',
+            'friendsoftypo3/cms-func',
+            'Provides Web->Functions BE module used in previous TYPO3 versions for extensions that still rely on it.'
+        );
+
+        $this->confirmation = new Confirmation(
+            'Are you sure?',
+            'You should install EXT:func only if you really need it. ' . $this->extension->getDescription(),
+            false
+        );
+    }
+
+    /**
+     * Return a confirmation message instance
+     *
+     * @return \TYPO3\CMS\Install\Updates\Confirmation
+     */
+    public function getConfirmation(): Confirmation
+    {
+        return $this->confirmation;
+    }
+
+    /**
+     * Return the identifier for this wizard
+     * This should be the same string as used in the ext_localconf class registration
+     *
+     * @return string
+     */
+    public function getIdentifier(): string
+    {
+        return 'funcExtension';
+    }
+
+    /**
+     * Return the speaking name of this wizard
+     *
+     * @return string
+     */
+    public function getTitle(): string
+    {
+        return 'Install extension "func" from TER';
+    }
+
+    /**
+     * Return the description for this wizard
+     *
+     * @return string
+     */
+    public function getDescription(): string
+    {
+        return 'The extension "func" that brings the "Web->Functions" backend module has been extracted to'
+               . ' the TYPO3 Extension Repository. This update downloads the TYPO3 extension func from the TER.'
+               . ' Use this if you\'re dealing with extensions in the instance that rely on "Web->Functions" and bring own'
+               . ' modules.';
+    }
+
+    /**
+     * Is an update necessary?
+     * Is used to determine whether a wizard needs to be run.
+     *
+     * @return bool
+     */
+    public function updateNecessary(): bool
+    {
+        return !ExtensionManagementUtility::isLoaded($this->extension->getKey());
+    }
+
+    /**
+     * Returns an array of class names of Prerequisite classes
+     * This way a wizard can define dependencies like "database up-to-date" or
+     * "reference index updated"
+     *
+     * @return string[]
+     */
+    public function getPrerequisites(): array
+    {
+        return [];
+    }
+}