ResourceLoaderUserGroupsModule.php

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<?php
class ResourceLoaderUserGroupsModule extends ResourceLoaderWikiModule {

        /* Protected Methods */
        protected $origin = self::ORIGIN_USER_SITEWIDE;

        protected function getPages( ResourceLoaderContext $context ) {
                global $wgUser;

                $userName = $context->getUser();
                if ( $userName === null ) {
                        return array();
                }

                // Use $wgUser is possible; allows to skip a lot of code
                if ( is_object( $wgUser ) && $wgUser->getName() == $userName ) {
                        $user = $wgUser;
                } else {
                        $user = User::newFromName( $userName );
                        if ( !$user instanceof User ) {
                                return array();
                        }
                }

                $pages = array();
                foreach( $user->getEffectiveGroups() as $group ) {
                        if ( in_array( $group, array( '*', 'user' ) ) ) {
                                continue;
                        }
                        $pages["MediaWiki:Group-$group.js"] = array( 'type' => 'script' );
                        $pages["MediaWiki:Group-$group.css"] = array( 'type' => 'style' );
                }
                return $pages;
        }

        /* Methods */

        public function getGroup() {
                return 'user';
        }
}