SMW::FileUpload::BeforeUpdate hook

SMW 2.4

use SMW\DataItemFactory

$GLOBALS['wgHooks']['SMW::FileUpload::BeforeUpdate'][] = function ( $filePage, $semanticData ) {

    $dataItemFactory = new DataItemFactory();

    $property = $dataItemFactory->newDIProperty( '___ext_file_sha1' );

    $semanticData->addPropertyObjectValue(
        $property,
        $dataItemFactory->newDIBlob( $filePage->getFile()->getSha1() )
    );

    $property = $dataItemFactory->newDIProperty( '___ext_file_size' );

    $semanticData->addPropertyObjectValue(
        $property,
        $dataItemFactory->newDIBlob( $filePage->getFile()->getSize() )
    );

    return true;
};