Get bitlove data for a list of enclosure URLs

def get_by_enclosures(self, enclosure_urls):
        """ Get bitlove data for a list of enclosure URLs """

        # prepare URLs
        enclosure_urls = map(str.strip, enclosure_urls)
        enclosure_urls = filter(None, enclosure_urls)

        return BitloveResponse(self.opener, enclosure_urls)