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diff --git a/www/wiki/includes/media/MediaHandlerFactory.php b/www/wiki/includes/media/MediaHandlerFactory.php
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+<?php
+/**
+ * Media-handling base classes and generic functionality.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Media
+ */
+
+/**
+ * Class to construct MediaHandler objects
+ *
+ * @since 1.28
+ */
+class MediaHandlerFactory {
+
+	/**
+	 * Default, MediaWiki core media handlers
+	 *
+	 * @var array
+	 */
+	private static $coreHandlers = [
+		'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
+	];
+
+	/**
+	 * @var array
+	 */
+	private $registry;
+
+	/**
+	 * Instance cache of MediaHandler objects by mimetype
+	 *
+	 * @var MediaHandler[]
+	 */
+	private $handlers;
+
+	public function __construct( array $registry ) {
+		$this->registry = $registry + self::$coreHandlers;
+	}
+
+	protected function getHandlerClass( $type ) {
+		if ( isset( $this->registry[$type] ) ) {
+			return $this->registry[$type];
+		} else {
+			return false;
+		}
+	}
+
+	/**
+	 * @param string $type mimetype
+	 * @return bool|MediaHandler
+	 */
+	public function getHandler( $type ) {
+		if ( isset( $this->handlers[$type] ) ) {
+			return $this->handlers[$type];
+		}
+
+		$class = $this->getHandlerClass( $type );
+		if ( $class !== false ) {
+			/** @var MediaHandler $handler */
+			$handler = new $class;
+			if ( !$handler->isEnabled() ) {
+				wfDebug( __METHOD__ . ": $class is not enabled\n" );
+				$handler = false;
+			}
+		} else {
+			wfDebug( __METHOD__ . ": no handler found for $type.\n" );
+			$handler = false;
+		}
+
+		$this->handlers[$type] = $handler;
+		return $handler;
+	}
+}