ThumbnailRenderJob.php

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<?php
class ThumbnailRenderJob extends Job {
    public function __construct( Title $title, array $params ) {
        parent::__construct( 'ThumbnailRender', $title, $params );
    }

    public function run() {
        global $wgUploadThumbnailRenderMethod;

        $transformParams = $this->params['transformParams'];

        $file = wfLocalFile( $this->title );
        $file->load( File::READ_LATEST );

        if ( $file && $file->exists() ) {
            if ( $wgUploadThumbnailRenderMethod === 'jobqueue' ) {
                $thumb = $file->transform( $transformParams, File::RENDER_NOW );

                if ( $thumb && !$thumb->isError() ) {
                    return true;
                } else {
                    $this->setLastError( __METHOD__ . ': thumbnail couln\'t be generated' );
                    return false;
                }
            } elseif ( $wgUploadThumbnailRenderMethod === 'http' ) {
                $thumbUrl = '';
                $status = $this->hitThumbUrl( $file, $transformParams, $thumbUrl );

                wfDebug( __METHOD__ . ": received status {$status}\n" );

                // 400 happens when requesting a size greater or equal than the original
                if ( $status === 200 || $status === 301 || $status === 302 || $status === 400 ) {
                    return true;
                } elseif ( $status ) {
                    $this->setLastError( __METHOD__ . ': incorrect HTTP status ' .
                        $status . ' when hitting ' . $thumbUrl );
                    return false;
                } else {
                    $this->setLastError( __METHOD__ . ': HTTP request failure' );
                    return false;
                }
            } else {
                $this->setLastError( __METHOD__ . ': unknown thumbnail render method ' .
                    $wgUploadThumbnailRenderMethod );
                return false;
            }
        } else {
            $this->setLastError( __METHOD__ . ': file doesn\'t exist' );
            return false;
        }
    }

    protected function hitThumbUrl( $file, $transformParams, &$thumbUrl ) {
        global $wgUploadThumbnailRenderHttpCustomHost, $wgUploadThumbnailRenderHttpCustomDomain;

        $thumbName = $file->thumbName( $transformParams );
        $thumbUrl = $file->getThumbUrl( $thumbName );

        if ( $wgUploadThumbnailRenderHttpCustomDomain ) {
            $parsedUrl = wfParseUrl( $thumbUrl );

            if ( !$parsedUrl || !isset( $parsedUrl['path'] ) || !strlen( $parsedUrl['path'] ) ) {
                return false;
            }

            $thumbUrl = '//' . $wgUploadThumbnailRenderHttpCustomDomain . $parsedUrl['path'];
        }

        wfDebug( __METHOD__ . ": hitting url {$thumbUrl}\n" );

        $request = MWHttpRequest::factory( $thumbUrl,
            [ 'method' => 'HEAD', 'followRedirects' => true ],
            __METHOD__
        );

        if ( $wgUploadThumbnailRenderHttpCustomHost ) {
            $request->setHeader( 'Host', $wgUploadThumbnailRenderHttpCustomHost );
        }

        $status = $request->execute();

        return $request->getStatus();
    }
}