primo commit

administrator/modules/mod_frontend/mod_frontend.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<extension type="module" client="administrator" method="upgrade">
+	<name>mod_frontend</name>
+	<author>Joomla! Project</author>
+	<creationDate>2019-07</creationDate>
+	<copyright>(C) 2019 Open Source Matters, Inc.</copyright>
+	<license>GNU General Public License version 2 or later; see LICENSE.txt</license>
+	<authorEmail>admin@joomla.org</authorEmail>
+	<authorUrl>www.joomla.org</authorUrl>
+	<version>4.0.0</version>
+	<description>MOD_FRONTEND_XML_DESCRIPTION</description>
+	<namespace path="src">Joomla\Module\Frontend</namespace>
+	<files>
+		<folder module="mod_frontend">services</folder>
+		<folder>src</folder>
+		<folder>tmpl</folder>
+	</files>
+	<languages>
+		<language tag="en-GB">language/en-GB/mod_frontend.ini</language>
+		<language tag="en-GB">language/en-GB/mod_frontend.sys.ini</language>
+	</languages>
+	<help key="Admin_Modules:_Frontend_Link" />
+	<config>
+		<fields name="params">
+			<fieldset name="advanced">
+				<field
+					name="layout"
+					type="modulelayout"
+					label="JFIELD_ALT_LAYOUT_LABEL"
+					class="form-select"
+				/>
+
+				<field
+					name="moduleclass_sfx"
+					type="textarea"
+					label="COM_MODULES_FIELD_MODULECLASS_SFX_LABEL"
+					rows="3"
+					validate="CssIdentifier"
+				/>
+			</fieldset>
+		</fields>
+	</config>
+</extension>

administrator/modules/mod_frontend/services/provider.php

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+<?php
+
+/**
+ * @package     Joomla.Administrator
+ * @subpackage  mod_frontend
+ *
+ * @copyright   (C) 2024 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+\defined('_JEXEC') or die;
+
+use Joomla\CMS\Extension\Service\Provider\Module;
+use Joomla\CMS\Extension\Service\Provider\ModuleDispatcherFactory;
+use Joomla\DI\Container;
+use Joomla\DI\ServiceProviderInterface;
+
+/**
+ * The frontend link module service provider.
+ *
+ * @since  5.1.0
+ */
+return new class () implements ServiceProviderInterface {
+    /**
+     * Registers the service provider with a DI container.
+     *
+     * @param   Container  $container  The DI container.
+     *
+     * @return  void
+     *
+     * @since   5.1.0
+     */
+    public function register(Container $container)
+    {
+        $container->registerServiceProvider(new ModuleDispatcherFactory('\\Joomla\\Module\\Frontend'));
+
+        $container->registerServiceProvider(new Module());
+    }
+};

administrator/modules/mod_frontend/src/Dispatcher/Dispatcher.php

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+<?php
+
+/**
+ * @package     Joomla.Administrator
+ * @subpackage  mod_frontend
+ *
+ * @copyright   (C) 2024 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+namespace Joomla\Module\Frontend\Administrator\Dispatcher;
+
+use Joomla\CMS\Dispatcher\AbstractModuleDispatcher;
+
+// phpcs:disable PSR1.Files.SideEffects
+\defined('_JEXEC') or die;
+// phpcs:enable PSR1.Files.SideEffects
+
+/**
+ * Dispatcher class for mod_frontend
+ *
+ * @since  5.1.0
+ */
+class Dispatcher extends AbstractModuleDispatcher
+{
+    /**
+     * Returns the layout data.
+     *
+     * @return  array
+     *
+     * @since   5.1.0
+     */
+    protected function getLayoutData()
+    {
+        $data = parent::getLayoutData();
+
+        $data['sitename'] = htmlspecialchars($this->getApplication()->get('sitename', ''), ENT_QUOTES, 'UTF-8');
+
+        return $data;
+    }
+}

administrator/modules/mod_frontend/tmpl/default.php

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+<?php
+
+/**
+ * @package     Joomla.Administrator
+ * @subpackage  mod_frontend
+ *
+ * @copyright   (C) 2019 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+defined('_JEXEC') or die;
+
+use Joomla\CMS\HTML\HTMLHelper;
+use Joomla\CMS\Language\Text;
+use Joomla\CMS\Uri\Uri;
+
+?>
+<a href="<?php echo Uri::root(); ?>" class="header-item-content"
+    title="<?php echo Text::sprintf('MOD_FRONTEND_PREVIEW', $sitename); ?>"
+    target="_blank">
+    <div class="header-item-icon">
+        <span class="icon-external-link-alt" aria-hidden="true"></span>
+    </div>
+    <div class="header-item-text">
+        <?php echo HTMLHelper::_('string.truncate', $sitename, 28, false, false); ?>
+    </div>
+</a>