From e40c758c2a8f049cd254ad73f0e6ade00bd004d9 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Sergey=20M=E2=80=A4?= <dstftw@gmail.com>
Date: Sat, 2 May 2020 07:18:08 +0700
Subject: [PATCH] [youtube] Improve player id extraction and add tests

---
 test/test_youtube_signature.py  | 22 +++++++++++++++++++
 youtube_dl/extractor/youtube.py | 38 +++++++++++++++------------------
 2 files changed, 39 insertions(+), 21 deletions(-)

diff --git a/test/test_youtube_signature.py b/test/test_youtube_signature.py
index f0c370eee..69df30eda 100644
--- a/test/test_youtube_signature.py
+++ b/test/test_youtube_signature.py
@@ -74,6 +74,28 @@ _TESTS = [
 ]
 
 
+class TestPlayerInfo(unittest.TestCase):
+    def test_youtube_extract_player_info(self):
+        PLAYER_URLS = (
+            ('https://www.youtube.com/s/player/64dddad9/player_ias.vflset/en_US/base.js', '64dddad9'),
+            # obsolete
+            ('https://www.youtube.com/yts/jsbin/player_ias-vfle4-e03/en_US/base.js', 'vfle4-e03'),
+            ('https://www.youtube.com/yts/jsbin/player_ias-vfl49f_g4/en_US/base.js', 'vfl49f_g4'),
+            ('https://www.youtube.com/yts/jsbin/player_ias-vflCPQUIL/en_US/base.js', 'vflCPQUIL'),
+            ('https://www.youtube.com/yts/jsbin/player-vflzQZbt7/en_US/base.js', 'vflzQZbt7'),
+            ('https://www.youtube.com/yts/jsbin/player-en_US-vflaxXRn1/base.js', 'vflaxXRn1'),
+            ('https://s.ytimg.com/yts/jsbin/html5player-en_US-vflXGBaUN.js', 'vflXGBaUN'),
+            ('https://s.ytimg.com/yts/jsbin/html5player-en_US-vflKjOTVq/html5player.js', 'vflKjOTVq'),
+            ('http://s.ytimg.com/yt/swfbin/watch_as3-vflrEm9Nq.swf', 'vflrEm9Nq'),
+            ('https://s.ytimg.com/yts/swfbin/player-vflenCdZL/watch_as3.swf', 'vflenCdZL'),
+        )
+        for player_url, expected_player_id in PLAYER_URLS:
+            expected_player_type = player_url.split('.')[-1]
+            player_type, player_id = YoutubeIE._extract_player_info(player_url)
+            self.assertEqual(player_type, expected_player_type)
+            self.assertEqual(player_id, expected_player_id)
+
+
 class TestSignature(unittest.TestCase):
     def setUp(self):
         TEST_DIR = os.path.dirname(os.path.abspath(__file__))
diff --git a/youtube_dl/extractor/youtube.py b/youtube_dl/extractor/youtube.py
index 28886cff2..5ea66c962 100644
--- a/youtube_dl/extractor/youtube.py
+++ b/youtube_dl/extractor/youtube.py
@@ -426,6 +426,10 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
                      (?(1).+)?                                                # if we found the ID, everything can follow
                      $""" % {'playlist_id': YoutubeBaseInfoExtractor._PLAYLIST_ID_RE}
     _NEXT_URL_RE = r'[\?&]next_url=([^&]+)'
+    _PLAYER_INFO_RE = (
+        r'/(?P<id>[a-zA-Z0-9_-]{8,})/player_ias\.vflset(?:/[a-zA-Z]{2,3}_[a-zA-Z]{2,3})?/base\.(?P<ext>[a-z]+)$',
+        r'\b(?P<id>vfl[a-zA-Z0-9_-]+)\b.*?\.(?P<ext>[a-z]+)$',
+    )
     _formats = {
         '5': {'ext': 'flv', 'width': 400, 'height': 240, 'acodec': 'mp3', 'abr': 64, 'vcodec': 'h263'},
         '6': {'ext': 'flv', 'width': 450, 'height': 270, 'acodec': 'mp3', 'abr': 64, 'vcodec': 'h263'},
@@ -1273,14 +1277,18 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
         """ Return a string representation of a signature """
         return '.'.join(compat_str(len(part)) for part in example_sig.split('.'))
 
-    def _extract_signature_function(self, video_id, player_url, example_sig):
-        id_m = re.match(
-            r'.*?[-.](?P<id>[a-zA-Z0-9_-]+)(?:/watch_as3|/html5player(?:-new)?|(?:/[a-z]{2,3}_[A-Z]{2})?/base)?\.(?P<ext>[a-z]+)$',
-            player_url)
-        if not id_m:
+    @classmethod
+    def _extract_player_info(cls, player_url):
+        for player_re in cls._PLAYER_INFO_RE:
+            id_m = re.search(player_re, player_url)
+            if id_m:
+                break
+        else:
             raise ExtractorError('Cannot identify player %r' % player_url)
-        player_type = id_m.group('ext')
-        player_id = id_m.group('id')
+        return id_m.group('ext'), id_m.group('id')
+
+    def _extract_signature_function(self, video_id, player_url, example_sig):
+        player_type, player_id = self._extract_player_info(player_url)
 
         # Read from filesystem cache
         func_id = '%s_%s_%s' % (
@@ -2009,22 +2017,10 @@ class YoutubeIE(YoutubeBaseInfoExtractor):
 
                         if self._downloader.params.get('verbose'):
                             if player_url is None:
-                                player_version = 'unknown'
                                 player_desc = 'unknown'
                             else:
-                                if player_url.endswith('swf'):
-                                    player_version = self._search_regex(
-                                        r'-(.+?)(?:/watch_as3)?\.swf$', player_url,
-                                        'flash player', fatal=False)
-                                    player_desc = 'flash player %s' % player_version
-                                else:
-                                    player_version = self._search_regex(
-                                        [r'html5player-([^/]+?)(?:/html5player(?:-new)?)?\.js',
-                                         r'(?:www|player(?:_ias)?)[-.]([^/]+)(?:/[a-z]{2,3}_[A-Z]{2})?/base\.js'],
-                                        player_url,
-                                        'html5 player', fatal=False)
-                                    player_desc = 'html5 player %s' % player_version
-
+                                player_type, player_version = self._extract_player_info(player_url)
+                                player_desc = '%s player %s' % ('flash' if player_type == 'swf' else 'html5', player_version)
                             parts_sizes = self._signature_cache_id(encrypted_sig)
                             self.to_screen('{%s} signature length %s, %s' %
                                            (format_id, parts_sizes, player_desc))
-- 
2.40.0