[lbry] Support video pages without channel in URL.

(Odysee uses Cloudflare and did not work over Tor.)

src/extractors/lbry.py

@@ -25,7 +25,24 @@ def extract_from_url (url, verbosity):
 	if len(username) > 0 and username[0] == "@":
 		return domain + "/$/rss/" + username
 
+def extract_from_page (page, verbosity):
+	# for example, https://odysee.com/the-ultimate-guide-to-using-matrix!:4d33438b778316b59aa174264d9eb3ec347fed53
+	# is canonically https://odysee.com/@techlore:3/the-ultimate-guide-to-using-matrix!#4
+	canonical_url = search (page, '<link rel="canonical" content="', '"/>')
+	if canonical_url is None:
+		canonical_url = search (page, '<meta property="og:url" content="', '"/>')
+
+	if not canonical_url is None:
+		return extract_from_url (canonical_url, verbosity)
+
 def extract (url, page=None, network=False, verbosity=3, args={}):
 	feed = extract_from_url (url, verbosity)
 	if not feed is None:
 		return feed
+	else:
+		notify ("Unable to get feed from URL alone", verbosity, platform)
+		if network:
+			page = download (platform, url, args, verbosity)
+			feed = extract_from_page (page, verbosity)
+			if not feed is None:
+				return feed

tests/lbry.txt

@@ -2,10 +2,13 @@
 https://odysee.com/@techlore:3 https://odysee.com/$/rss/@techlore:3
 https://odysee.com/@Coldfusion:f https://odysee.com/$/rss/@Coldfusion:f
 
-# video page
+# video page with channel in URL
 https://odysee.com/@techlore:3/the-dark-side-of-discord-(and-best:5 https://odysee.com/$/rss/@techlore:3
 https://odysee.com/@Coldfusion:f/exploring-ai-generated-music:f https://odysee.com/$/rss/@Coldfusion:f
 
+# video page without channel in URL
+https://odysee.com/the-ultimate-guide-to-using-matrix!:4d33438b778316b59aa174264d9eb3ec347fed53 https://odysee.com/$/rss/@techlore:3
+
 # TODO: playlist pages
 # note: While odysee has a "playlists" tab for channels, I didn't see any
 # evidence (on 2021-09-22) that playlists are an actual thing that exists.