def archive_resource(context, resource, log, result=None, url_timeout=30):
    """
    Archive the given resource. Moves the file from the temporary location
    given in download().

    Params:
       result - result of the download(), containing keys: length, saved_file

    If there is a failure, raises ArchiveError.

    Returns: {cache_filepath, cache_url}
    """
    from ckanext.archiver import default_settings as settings
    relative_archive_path = os.path.join(resource['id'][:2], resource['id'])
    archive_dir = os.path.join(settings.ARCHIVE_DIR, relative_archive_path)
    if not os.path.exists(archive_dir):
        os.makedirs(archive_dir)
    # try to get a file name from the url
    parsed_url = urlparse(resource.get('url'))
    try:
        file_name = parsed_url.path.split('/')[-1] or 'resource'
        file_name = file_name.strip()  # trailing spaces cause problems
    except Exception:
        file_name = "resource"

    # move the temp file to the resource's archival directory
    saved_file = os.path.join(archive_dir, file_name)
    shutil.move(result['saved_file'], saved_file)
    log.info('Going to do chmod: %s', saved_file)
    try:
        os.chmod(saved_file, 0o644)  # allow other users to read it
    except Exception as e:
        log.error('chmod failed %s: %s', saved_file, e)
        raise
    log.info('Archived resource as: %s', saved_file)

    # calculate the cache_url
    if not context.get('cache_url_root'):
        log.warning('Not saved cache_url because no value for '
                    'ckanext-archiver.cache_url_root in config')
        raise ArchiveError(_('No value for ckanext-archiver.cache_url_root in config'))
    cache_url = urljoin(str(context['cache_url_root']),
                        '%s/%s' % (str(relative_archive_path), str(file_name)))
    return {'cache_filepath': saved_file,
            'cache_url': cache_url}