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diff --git a/includes/ResourceLoader/UserModule.php b/includes/ResourceLoader/UserModule.php
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+<?php
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @author Trevor Parscal
+ * @author Roan Kattouw
+ */
+
+namespace MediaWiki\ResourceLoader;
+
+use MediaWiki\MainConfigNames;
+use MediaWiki\MediaWikiServices;
+use TitleValue;
+
+/**
+ * Module for user customizations scripts.
+ *
+ * @ingroup ResourceLoader
+ * @internal
+ */
+class UserModule extends WikiModule {
+	protected $origin = self::ORIGIN_USER_INDIVIDUAL;
+	protected $targets = [ 'desktop', 'mobile' ];
+
+	/**
+	 * @param Context $context
+	 * @return array[]
+	 */
+	protected function getPages( Context $context ) {
+		$user = $context->getUserIdentity();
+		if ( !$user || !$user->isRegistered() ) {
+			return [];
+		}
+
+		$config = $this->getConfig();
+		$pages = [];
+
+		if ( $config->get( MainConfigNames::AllowUserJs ) ) {
+			$titleFormatter = MediaWikiServices::getInstance()->getTitleFormatter();
+			// Use localised/normalised variant to ensure $excludepage matches
+			$userPage = $titleFormatter->getPrefixedDBkey( new TitleValue( NS_USER, $user->getName() ) );
+			$pages["$userPage/common.js"] = [ 'type' => 'script' ];
+			$pages["$userPage/" . $context->getSkin() . '.js'] = [ 'type' => 'script' ];
+		}
+
+		// User group pages are maintained site-wide and enabled with site JS/CSS.
+		if ( $config->get( MainConfigNames::UseSiteJs ) ) {
+			$userGroupManager = MediaWikiServices::getInstance()->getUserGroupManager();
+			foreach ( $userGroupManager->getUserEffectiveGroups( $user ) as $group ) {
+				if ( $group == '*' ) {
+					continue;
+				}
+				$pages["MediaWiki:Group-$group.js"] = [ 'type' => 'script' ];
+			}
+		}
+
+		// This is obsolete since 1.32 (T112474). It was formerly used by
+		// OutputPage to implement previewing of user CSS and JS.
+		// @todo: Remove it once we're sure nothing else is using the parameter
+		$excludepage = $context->getRequest()->getVal( 'excludepage' );
+		unset( $pages[$excludepage] );
+
+		return $pages;
+	}
+
+	/**
+	 * Get group name
+	 *
+	 * @return string
+	 */
+	public function getGroup() {
+		return self::GROUP_USER;
+	}
+}
+
+/** @deprecated since 1.39 */
+class_alias( UserModule::class, 'ResourceLoaderUserModule' );