ResourceLoaderUserStylesModule.php

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<?php
class ResourceLoaderUserStylesModule extends ResourceLoaderWikiModule {
 
    protected $origin = self::ORIGIN_USER_INDIVIDUAL;
    protected $targets = [ 'desktop', 'mobile' ];
 
    protected function getPages( ResourceLoaderContext $context ) {
        $config = $this->getConfig();
        $user = $context->getUserObj();
        if ( $user->isAnon() ) {
            return [];
        }
 
        // Use localised/normalised variant to ensure $excludepage matches
        $userPage = $user->getUserPage()->getPrefixedDBkey();
        $pages = [];
 
        if ( $config->get( 'AllowUserCss' ) ) {
            $pages["$userPage/common.css"] = [ 'type' => 'style' ];
            $pages["$userPage/" . $context->getSkin() . '.css'] = [ 'type' => 'style' ];
        }
 
        // User group pages are maintained site-wide and enabled with site JS/CSS.
        if ( $config->get( 'UseSiteCss' ) ) {
            foreach ( $user->getEffectiveGroups() as $group ) {
                if ( $group == '*' ) {
                    continue;
                }
                $pages["MediaWiki:Group-$group.css"] = [ 'type' => 'style' ];
            }
        }
 
        // This is obsolete since 1.32 (T112474).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' );
        if ( isset( $pages[$excludepage] ) ) {
            unset( $pages[$excludepage] );
        }
 
        return $pages;
    }
 
    public function getType() {
        return self::LOAD_STYLES;
    }
 
    public function getGroup() {
        return 'user';
    }
}