SkinFallback.php

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<?php
use MediaWiki\Html\Html;
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use MediaWiki\Output\OutputPage;
 
class SkinFallback extends SkinMustache {
    public $skinname = 'fallback';
 
    public function initPage( OutputPage $out ) {
        parent::initPage( $out );
        $out->disableClientCache();
    }
 
    private function findInstalledSkins() {
        $config = $this->getConfig();
        $styleDirectory = $config->get( MainConfigNames::StyleDirectory );
        // Get all subdirectories which might contains skins
        $possibleSkins = scandir( $styleDirectory );
        $possibleSkins = array_filter( $possibleSkins, static function ( $maybeDir ) use ( $styleDirectory ) {
            return $maybeDir !== '.' && $maybeDir !== '..' && is_dir( "$styleDirectory/$maybeDir" );
        } );
 
        // Filter out skins that aren't installed
        $possibleSkins = array_filter( $possibleSkins, static function ( $skinDir ) use ( $styleDirectory ) {
            return is_file( "$styleDirectory/$skinDir/skin.json" )
                || is_file( "$styleDirectory/$skinDir/$skinDir.php" );
        } );
 
        return $possibleSkins;
    }
 
    private function buildHelpfulInformationMessage() {
        $config = $this->getConfig();
        $defaultSkin = $config->get( MainConfigNames::DefaultSkin );
        $installedSkins = $this->findInstalledSkins();
        $skinFactory = MediaWikiServices::getInstance()->getSkinFactory();
        $enabledSkins = $skinFactory->getInstalledSkins();
        $enabledSkins = array_change_key_case( $enabledSkins, CASE_LOWER );
 
        if ( $installedSkins ) {
            $skinsInstalledText = [];
            $skinsInstalledSnippet = [];
 
            foreach ( $installedSkins as $skinKey ) {
                $normalizedKey = strtolower( $skinKey );
                $isEnabled = array_key_exists( $normalizedKey, $enabledSkins );
                if ( $isEnabled ) {
                    $skinsInstalledText[] = $this->msg( 'default-skin-not-found-row-enabled' )
                        ->params( $normalizedKey, $skinKey )->plain();
                } else {
                    $skinsInstalledText[] = $this->msg( 'default-skin-not-found-row-disabled' )
                        ->params( $normalizedKey, $skinKey )->plain();
                    $skinsInstalledSnippet[] = $this->getSnippetForSkin( $skinKey );
                }
            }
 
            return $this->msg( 'default-skin-not-found' )->params(
                $defaultSkin,
                implode( "\n", $skinsInstalledText ),
                implode( "\n", $skinsInstalledSnippet ) )->numParams(
                    count( $skinsInstalledText ),
                    count( $skinsInstalledSnippet )
            )->parseAsBlock();
        } else {
            return $this->msg( 'default-skin-not-found-no-skins' )->params(
                $defaultSkin
            )->parseAsBlock();
        }
    }
 
    private static function getSnippetForSkin( $skin ) {
        global $IP;
        if ( file_exists( "$IP/skins/$skin/skin.json" ) ) {
            return "wfLoadSkin( '$skin' );";
        } else {
            return "require_once \"\$IP/skins/$skin/$skin.php\";";
        }
    }
 
    public function getTemplateData() {
        $config = $this->getConfig();
        $skinFactory = MediaWikiServices::getInstance()->getSkinFactory();
        $data = parent::getTemplateData();
        // If the default skin isn't configured correctly, append a warning to the
        // subtitle to alert a sysadmin.
        if ( !isset(
            $skinFactory->getInstalledSkins()[$config->get( MainConfigNames::DefaultSkin )]
        ) ) {
            $data['html-fallback-warning'] = Html::warningBox( $this->buildHelpfulInformationMessage() );
        }
        return $data;
    }
}