ResourceLoaderUserGroupsModule.php

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<?php
class ResourceLoaderUserGroupsModule extends ResourceLoaderWikiModule {

    /* Protected Members */

    protected $origin = self::ORIGIN_USER_SITEWIDE;
    protected $targets = array( 'desktop', 'mobile' );

    /* Protected Methods */

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

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

        $useSiteJs = $this->getConfig()->get( 'UseSiteJs' );
        $useSiteCss = $this->getConfig()->get( 'UseSiteCss' );
        if ( !$useSiteJs && !$useSiteCss ) {
            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 ( $group == '*' ) {
                continue;
            }
            if ( $useSiteJs ) {
                $pages["MediaWiki:Group-$group.js"] = array( 'type' => 'script' );
            }
            if ( $useSiteCss ) {
                $pages["MediaWiki:Group-$group.css"] = array( 'type' => 'style' );
            }
        }
        return $pages;
    }

    /* Methods */

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