SpecialFilepath.php

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<?php
class SpecialFilepath extends SpecialPage {

        function __construct() {
                parent::__construct( 'Filepath' );
        }

        function execute( $par ) {
                $this->setHeaders();
                $this->outputHeader();

                $request = $this->getRequest();
                $file = !is_null( $par ) ? $par : $request->getText( 'file' );

                $title = Title::newFromText( $file, NS_FILE );

                if ( ! $title instanceof Title || $title->getNamespace() != NS_FILE ) {
                        $this->showForm( $title );
                } else {
                        $file = wfFindFile( $title );

                        if ( $file && $file->exists() ) {
                                // Default behaviour: Use the direct link to the file.
                                $url = $file->getURL();
                                $width = $request->getInt( 'width', -1 );
                                $height = $request->getInt( 'height', -1 );

                                // If a width is requested...
                                if ( $width != -1 ) {
                                        $mto = $file->transform( array( 'width' => $width, 'height' => $height ) );
                                        // ... and we can
                                        if ( $mto && !$mto->isError() ) {
                                                // ... change the URL to point to a thumbnail.
                                                $url = $mto->getURL();
                                        }
                                }
                                $this->getOutput()->redirect( $url );
                        } else {
                                $this->getOutput()->setStatusCode( 404 );
                                $this->showForm( $title );
                        }
                }
        }

        function showForm( $title ) {
                global $wgScript;

                $this->getOutput()->addHTML(
                        Html::openElement( 'form', array( 'method' => 'get', 'action' => $wgScript, 'id' => 'specialfilepath' ) ) .
                        Html::openElement( 'fieldset' ) .
                        Html::element( 'legend', null, wfMsg( 'filepath' ) ) .
                        Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) .
                        Xml::inputLabel( wfMsg( 'filepath-page' ), 'file', 'file', 25, is_object( $title ) ? $title->getText() : '' ) . ' ' .
                        Xml::submitButton( wfMsg( 'filepath-submit' ) ) . "\n" .
                        Html::closeElement( 'fieldset' ) .
                        Html::closeElement( 'form' )
                );
        }
}