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administrator/components/com_admin/postinstall/behindproxy.php

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+<?php
+
+/**
+ * @package     Joomla.Administrator
+ * @subpackage  com_admin
+ *
+ * @copyright   Copyright (C) 2005 - 2020 Open Source Matters, Inc. All rights reserved.
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+use Joomla\CMS\Factory;
+use Joomla\CMS\Language\Text;
+use Joomla\Filesystem\File;
+use Joomla\Filesystem\Path;
+use Joomla\Registry\Registry;
+use Joomla\Utilities\ArrayHelper;
+
+// phpcs:disable PSR1.Files.SideEffects
+\defined('_JEXEC') or die;
+// phpcs:enable PSR1.Files.SideEffects
+
+/**
+ * Notifies users of the new Behind Load Balancer option in Global Config, if we detect they might be behind a proxy
+ *
+ * @return  boolean
+ *
+ * @since   3.9.26
+ */
+function admin_postinstall_behindproxy_condition()
+{
+    $app = Factory::getApplication();
+
+    if ($app->get('behind_loadbalancer', '0')) {
+        return false;
+    }
+
+    if (\array_key_exists('HTTP_X_FORWARDED_FOR', $_SERVER) && !empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
+        return true;
+    }
+
+    if (\array_key_exists('HTTP_CLIENT_IP', $_SERVER) && !empty($_SERVER['HTTP_CLIENT_IP'])) {
+        return true;
+    }
+
+    return false;
+}
+
+
+/**
+ * Enables the Behind Load Balancer setting in Global Configuration
+ *
+ * @return  void
+ *
+ * @since   3.9.26
+ */
+function behindproxy_postinstall_action()
+{
+    $prev = ArrayHelper::fromObject(new JConfig());
+    $data = array_merge($prev, ['behind_loadbalancer' => '1']);
+
+    $config = new Registry($data);
+
+    // Set the configuration file path.
+    $file = JPATH_CONFIGURATION . '/configuration.php';
+
+    // Attempt to make the file writeable
+    if (Path::isOwner($file) && !Path::setPermissions($file, '0644')) {
+        Factory::getApplication()->enqueueMessage(Text::_('COM_CONFIG_ERROR_CONFIGURATION_PHP_NOTWRITABLE'), 'error');
+
+        return;
+    }
+
+    // Attempt to write the configuration file as a PHP class named JConfig.
+    $configuration = $config->toString('PHP', ['class' => 'JConfig', 'closingtag' => false]);
+
+    if (!File::write($file, $configuration)) {
+        Factory::getApplication()->enqueueMessage(Text::_('COM_CONFIG_ERROR_WRITE_FAILED'), 'error');
+
+        return;
+    }
+
+    // Attempt to make the file unwriteable
+    if (Path::isOwner($file) && !Path::setPermissions($file, '0444')) {
+        Factory::getApplication()->enqueueMessage(Text::_('COM_CONFIG_ERROR_CONFIGURATION_PHP_NOTUNWRITABLE'), 'error');
+    }
+}