+ _VALID_URL = r'https?://.*brightcove\.com/(services|viewer).*\?(?P<query>.*)'
+ _FEDERATED_URL_TEMPLATE = 'http://c.brightcove.com/services/viewer/htmlFederated?%s'
+ _PLAYLIST_URL_TEMPLATE = 'http://c.brightcove.com/services/json/experience/runtime/?command=get_programming_for_experience&playerKey=%s'
+
+ # There is a test for Brigtcove in GenericIE, that way we test both the download
+ # and the detection of videos, and we don't have to find an URL that is always valid
+
+ @classmethod
+ def _build_brighcove_url(cls, object_str):
+ """
+ Build a Brightcove url from a xml string containing
+ <object class="BrightcoveExperience">{params}</object>
+ """
+ object_doc = xml.etree.ElementTree.fromstring(object_str)
+ assert u'BrightcoveExperience' in object_doc.attrib['class']
+ params = {'flashID': object_doc.attrib['id'],
+ 'playerID': find_xpath_attr(object_doc, './param', 'name', 'playerID').attrib['value'],
+ }
+ playerKey = find_xpath_attr(object_doc, './param', 'name', 'playerKey')
+ # Not all pages define this value
+ if playerKey is not None:
+ params['playerKey'] = playerKey.attrib['value']
+ videoPlayer = find_xpath_attr(object_doc, './param', 'name', '@videoPlayer')
+ if videoPlayer is not None:
+ params['@videoPlayer'] = videoPlayer.attrib['value']
+ data = compat_urllib_parse.urlencode(params)
+ return cls._FEDERATED_URL_TEMPLATE % data