class.ilCountPDFPagesPreProcessors.php

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<?php

use ILIAS\Filesystem\Stream\FileStream;
use ILIAS\FileUpload\DTO\Metadata;
use ILIAS\FileUpload\DTO\ProcessingStatus;
use ILIAS\FileUpload\Processor\PreProcessor;
use ILIAS\FileUpload\MimeType;

class ilCountPDFPagesPreProcessors implements PreProcessor
{
    public const PAGE_COUNT = 'page_count';
    private ilCountPDFPages $page_counter;

    public function __construct()
    {
        $this->page_counter = new ilCountPDFPages();
    }

    public function process(FileStream $stream, Metadata $metadata): \ILIAS\FileUpload\DTO\ProcessingStatus
    {
        if (
            $this->page_counter->isAvailable()
            && $metadata->getMimeType() === MimeType::APPLICATION__PDF
        ) {
            $path_to_pdf = $stream->getMetadata('uri');
            $metadata->additionalMetaData()->put(
                self::PAGE_COUNT,
                (string) $this->page_counter->extractAmountOfPagesByPath($path_to_pdf)
            );
        }

        return new ProcessingStatus(
            ProcessingStatus::OK,
            'ilCountPDFPagesPreProcessors'
        );
    }
}