bundles/org.eclipse.packagedrone.repo.adapter.maven/src/org/eclipse/packagedrone/repo/adapter/maven/upload/Uploader.java
private String isCheckSum ( final Coordinates c )
    {
        final String cext = c.getExtension ();

        if ( cext == null )
        {
            return null;
        }

        for ( final String ext : this.options.getChecksumExtensions () )
        {
            if ( cext.endsWith ( "." + ext ) )
            {
                return ext;
            }
        }

        return null;
    }
private String isCheckSum ( final Coordinates c )
    {
        final String cext = c.getExtension ();

        if ( cext == null )
        {
            return null;
        }

        for ( final String ext : this.options.getChecksumExtensions () )
        {
            if ( cext.endsWith ( "." + ext ) )
            {
                return ext;
            }
        }

        return null;
    }
Check if the uploaded artifact is actually a checksum file

@param c
the extracted coordinates
@return {@code true} if the upload is definitely a checksum file,
{@code false} otherwise