CreatePdfThumbnailsJob.php

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<?php
 
class CreatePdfThumbnailsJob extends Job {
    const BIG_THUMB = 1;
    const SMALL_THUMB = 2;
 
    public function __construct( $title, $params ) {
        parent::__construct( 'createPdfThumbnailsJob', $title, $params );
    }
 
    public function run() {
        if ( !isset( $this->params['page'] ) ) {
            wfDebugLog( 'thumbnails', 'A page for thumbnails job of ' . $this->title->getText() .
                ' was not specified! That should never happen!' );
            return true; // no page set? that should never happen
        }
 
        $file = wfLocalFile( $this->title ); // we just want a local file
        if ( !$file ) {
            return true; // Just silently fail, perhaps the file was already deleted, don't bother
        }
 
        switch ( $this->params['jobtype'] ) {
            case self::BIG_THUMB:
                global $wgImageLimits;
                // Ignore user preferences, do default thumbnails
                // everything here shamelessy copied and reused from includes/ImagePage.php
                $sizeSel = User::getDefaultOption( 'imagesize' );
 
                // The user offset might still be incorrect, specially if
                // $wgImageLimits got changed (see bug #8858).
                if ( !isset( $wgImageLimits[$sizeSel] ) ) {
                    // Default to the first offset in $wgImageLimits
                    $sizeSel = 0;
                }
                $max = $wgImageLimits[$sizeSel];
                $maxWidth = $max[0];
                $maxHeight = $max[1];
 
                $width_orig = $file->getWidth( $this->params['page'] );
                $width = $width_orig;
                $height_orig = $file->getHeight( $this->params['page'] );
                $height = $height_orig;
                if ( $width > $maxWidth || $height > $maxHeight ) {
                    // Calculate the thumbnail size.
                    // First case, the limiting factor is the width, not the height.
                    if ( $width / $height >= $maxWidth / $maxHeight ) {
                        // $height = round( $height * $maxWidth / $width );
                        $width = $maxWidth;
                        // Note that $height <= $maxHeight now.
                    } else {
                        $newwidth = floor( $width * $maxHeight / $height );
                        // $height = round( $height * $newwidth / $width );
                        $width = $newwidth;
                        // Note that $height <= $maxHeight now, but might not be identical
                        // because of rounding.
                    }
                    $transformParams = [ 'page' => $this->params['page'], 'width' => $width ];
                    $file->transform( $transformParams );
                }
                break;
 
            case self::SMALL_THUMB:
                Linker::makeThumbLinkObj( $this->title, $file, '', '', 'none',
                    [ 'page' => $this->params['page'] ] );
                break;
        }
 
        return true;
    }
 
    public static function insertJobs( $upload, $mime, &$error ) {
        global $wgPdfCreateThumbnailsInJobQueue;
        if ( !$wgPdfCreateThumbnailsInJobQueue ) {
            return true;
        }
        $magic = MediaWiki\MediaWikiServices::getInstance()->getMimeAnalyzer();
        if ( !$magic->isMatchingExtension( 'pdf', $mime ) ) {
            return true; // not a PDF, abort
        }
 
        $title = $upload->getTitle();
        $uploadFile = $upload->getLocalFile();
        if ( is_null( $uploadFile ) ) {
            wfDebugLog( 'thumbnails', '$uploadFile seems to be null, should never happen...' );
            return true; // should never happen, but it's better to be secure
        }
 
        $metadata = $uploadFile->getMetadata();
        $unserialized = unserialize( $metadata );
        $pages = intval( $unserialized['Pages'] );
 
        $jobs = [];
        for ( $i = 1; $i <= $pages; $i++ ) {
            $jobs[] = new CreatePdfThumbnailsJob(
                $title,
                [ 'page' => $i, 'jobtype' => self::BIG_THUMB ]
            );
            $jobs[] = new CreatePdfThumbnailsJob(
                $title,
                [ 'page' => $i, 'jobtype' => self::SMALL_THUMB ]
            );
        }
        JobQueueGroup::singleton()->push( $jobs );
        return true;
    }
}