MediaHandlerFactory.php

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<?php
class MediaHandlerFactory {
 
    private const CORE_HANDLERS = [
        'image/jpeg' => JpegHandler::class,
        'image/png' => PNGHandler::class,
        'image/gif' => GIFHandler::class,
        'image/tiff' => TiffHandler::class,
        'image/webp' => WebPHandler::class,
        'image/x-ms-bmp' => BmpHandler::class,
        'image/x-bmp' => BmpHandler::class,
        'image/x-xcf' => XCFHandler::class,
        'image/svg+xml' => SvgHandler::class, // official
        'image/svg' => SvgHandler::class, // compat
        'image/vnd.djvu' => DjVuHandler::class, // official
        'image/x.djvu' => DjVuHandler::class, // compat
        'image/x-djvu' => DjVuHandler::class, // compat
    ];
 
    private $registry;
 
    private $handlers;
 
    public function __construct( array $registry ) {
        $this->registry = $registry + self::CORE_HANDLERS;
    }
 
    protected function getHandlerClass( $type ) {
        return $this->registry[$type] ?? false;
    }
 
    public function getHandler( $type ) {
        if ( isset( $this->handlers[$type] ) ) {
            return $this->handlers[$type];
        }
 
        $class = $this->getHandlerClass( $type );
        if ( $class !== false ) {
            $handler = new $class;
            if ( !$handler->isEnabled() ) {
                wfDebug( __METHOD__ . ": $class is not enabled" );
                $handler = false;
            }
        } else {
            wfDebug( __METHOD__ . ": no handler found for $type." );
            $handler = false;
        }
 
        $this->handlers[$type] = $handler;
        return $handler;
    }
}