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, $wgUseSiteJs, $wgUseSiteCss;

        $userName = $context->getUser();
        if ( $userName === null ) {
            return array();
        }
        if ( !$wgUseSiteJs && !$wgUseSiteCss ) {
            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;
            }
            if ( $wgUseSiteJs ) {
                $pages["MediaWiki:Group-$group.js"] = array( 'type' => 'script' );
            }
            if ( $wgUseSiteCss ) {
                $pages["MediaWiki:Group-$group.css"] = array( 'type' => 'style' );
            }
        }
        return $pages;
    }

    /* Methods */

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