[brightcove] cache brightcove player policy keys

youtube_dl/extractor/brightcove.py

@@ -586,12 +586,13 @@ class BrightcoveNewIE(AdobePassIE):
 
         account_id, player_id, embed, content_type, video_id = re.match(self._VALID_URL, url).groups()
 
+        policy_key_id = '%s_%s' % (account_id, player_id)
+        policy_key = self._downloader.cache.load('brightcove', policy_key_id)
+        if not policy_key:
             webpage = self._download_webpage(
                 'http://players.brightcove.net/%s/%s_%s/index.min.js'
                 % (account_id, player_id, embed), video_id)
 
-        policy_key = None
-
             catalog = self._search_regex(
                 r'catalog\(({.+?})\);', webpage, 'catalog', default=None)
             if catalog:
@@ -604,6 +605,7 @@ class BrightcoveNewIE(AdobePassIE):
                 policy_key = self._search_regex(
                     r'policyKey\s*:\s*(["\'])(?P<pk>.+?)\1',
                     webpage, 'policy key', group='pk')
+            self._downloader.cache.store('brightcove', policy_key_id, policy_key)
 
         api_url = 'https://edge.api.brightcove.com/playback/v1/accounts/%s/%ss/%s' % (account_id, content_type, video_id)
         headers = {