youtube_dl/extractor/youtube.py

   1 # coding: utf-8
   2
   3 import json
   4 import netrc
   5 import re
   6 import socket
   7 import itertools
   8 import xml.etree.ElementTree
   9
  10 from .common import InfoExtractor, SearchInfoExtractor
  11 from .subtitles import SubtitlesInfoExtractor
  12 from ..utils import (
  13     compat_http_client,
  14     compat_parse_qs,
  15     compat_urllib_error,
  16     compat_urllib_parse,
  17     compat_urllib_request,
  18     compat_str,
  19
  20     clean_html,
  21     get_element_by_id,
  22     ExtractorError,
  23     unescapeHTML,
  24     unified_strdate,
  25     orderedSet,
  26 )
  27
  28 class YoutubeBaseInfoExtractor(InfoExtractor):
  29     """Provide base functions for Youtube extractors"""
  30     _LOGIN_URL = 'https://accounts.google.com/ServiceLogin'
  31     _LANG_URL = r'https://www.youtube.com/?hl=en&persist_hl=1&gl=US&persist_gl=1&opt_out_ackd=1'
  32     _AGE_URL = 'http://www.youtube.com/verify_age?next_url=/&gl=US&hl=en'
  33     _NETRC_MACHINE = 'youtube'
  34     # If True it will raise an error if no login info is provided
  35     _LOGIN_REQUIRED = False
  36
  37     def report_lang(self):
  38         """Report attempt to set language."""
  39         self.to_screen(u'Setting language')
  40
  41     def _set_language(self):
  42         request = compat_urllib_request.Request(self._LANG_URL)
  43         try:
  44             self.report_lang()
  45             compat_urllib_request.urlopen(request).read()
  46         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
  47             self._downloader.report_warning(u'unable to set language: %s' % compat_str(err))
  48             return False
  49         return True
  50
  51     def _login(self):
  52         (username, password) = self._get_login_info()
  53         # No authentication to be performed
  54         if username is None:
  55             if self._LOGIN_REQUIRED:
  56                 raise ExtractorError(u'No login info available, needed for using %s.' % self.IE_NAME, expected=True)
  57             return False
  58
  59         request = compat_urllib_request.Request(self._LOGIN_URL)
  60         try:
  61             login_page = compat_urllib_request.urlopen(request).read().decode('utf-8')
  62         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
  63             self._downloader.report_warning(u'unable to fetch login page: %s' % compat_str(err))
  64             return False
  65
  66         galx = None
  67         dsh = None
  68         match = re.search(re.compile(r'<input.+?name="GALX".+?value="(.+?)"', re.DOTALL), login_page)
  69         if match:
  70           galx = match.group(1)
  71         match = re.search(re.compile(r'<input.+?name="dsh".+?value="(.+?)"', re.DOTALL), login_page)
  72         if match:
  73           dsh = match.group(1)
  74
  75         # Log in
  76         login_form_strs = {
  77                 u'continue': u'https://www.youtube.com/signin?action_handle_signin=true&feature=sign_in_button&hl=en_US&nomobiletemp=1',
  78                 u'Email': username,
  79                 u'GALX': galx,
  80                 u'Passwd': password,
  81                 u'PersistentCookie': u'yes',
  82                 u'_utf8': u'霱',
  83                 u'bgresponse': u'js_disabled',
  84                 u'checkConnection': u'',
  85                 u'checkedDomains': u'youtube',
  86                 u'dnConn': u'',
  87                 u'dsh': dsh,
  88                 u'pstMsg': u'0',
  89                 u'rmShown': u'1',
  90                 u'secTok': u'',
  91                 u'signIn': u'Sign in',
  92                 u'timeStmp': u'',
  93                 u'service': u'youtube',
  94                 u'uilel': u'3',
  95                 u'hl': u'en_US',
  96         }
  97         # Convert to UTF-8 *before* urlencode because Python 2.x's urlencode
  98         # chokes on unicode
  99         login_form = dict((k.encode('utf-8'), v.encode('utf-8')) for k,v in login_form_strs.items())
 100         login_data = compat_urllib_parse.urlencode(login_form).encode('ascii')
 101         request = compat_urllib_request.Request(self._LOGIN_URL, login_data)
 102         try:
 103             self.report_login()
 104             login_results = compat_urllib_request.urlopen(request).read().decode('utf-8')
 105             if re.search(r'(?i)<form[^>]* id="gaia_loginform"', login_results) is not None:
 106                 self._downloader.report_warning(u'unable to log in: bad username or password')
 107                 return False
 108         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 109             self._downloader.report_warning(u'unable to log in: %s' % compat_str(err))
 110             return False
 111         return True
 112
 113     def _confirm_age(self):
 114         age_form = {
 115                 'next_url':     '/',
 116                 'action_confirm':   'Confirm',
 117                 }
 118         request = compat_urllib_request.Request(self._AGE_URL, compat_urllib_parse.urlencode(age_form))
 119         try:
 120             self.report_age_confirmation()
 121             compat_urllib_request.urlopen(request).read().decode('utf-8')
 122         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 123             raise ExtractorError(u'Unable to confirm age: %s' % compat_str(err))
 124         return True
 125
 126     def _real_initialize(self):
 127         if self._downloader is None:
 128             return
 129         if not self._set_language():
 130             return
 131         if not self._login():
 132             return
 133         self._confirm_age()
 134
 135
 136 class YoutubeIE(YoutubeBaseInfoExtractor, SubtitlesInfoExtractor):
 137     IE_DESC = u'YouTube.com'
 138     _VALID_URL = r"""^
 139                      (
 140                          (?:https?://)?                                       # http(s):// (optional)
 141                          (?:(?:(?:(?:\w+\.)?youtube(?:-nocookie)?\.com/|
 142                             tube\.majestyc\.net/)                             # the various hostnames, with wildcard subdomains
 143                          (?:.*?\#/)?                                          # handle anchor (#/) redirect urls
 144                          (?:                                                  # the various things that can precede the ID:
 145                              (?:(?:v|embed|e)/)                               # v/ or embed/ or e/
 146                              |(?:                                             # or the v= param in all its forms
 147                                  (?:(?:watch|movie)(?:_popup)?(?:\.php)?)?    # preceding watch(_popup|.php) or nothing (like /?v=xxxx)
 148                                  (?:\?|\#!?)                                  # the params delimiter ? or # or #!
 149                                  (?:.*?&)?                                    # any other preceding param (like /?s=tuff&v=xxxx)
 150                                  v=
 151                              )
 152                          ))
 153                          |youtu\.be/                                          # just youtu.be/xxxx
 154                          )
 155                      )?                                                       # all until now is optional -> you can pass the naked ID
 156                      ([0-9A-Za-z_-]{11})                                      # here is it! the YouTube video ID
 157                      (?(1).+)?                                                # if we found the ID, everything can follow
 158                      $"""
 159     _NEXT_URL_RE = r'[\?&]next_url=([^&]+)'
 160     # Listed in order of quality
 161     _available_formats = ['38', '37', '46', '22', '45', '35', '44', '34', '18', '43', '6', '5', '36', '17', '13',
 162                           # Apple HTTP Live Streaming
 163                           '96', '95', '94', '93', '92', '132', '151',
 164                           # 3D
 165                           '85', '84', '102', '83', '101', '82', '100',
 166                           # Dash video
 167                           '138', '137', '248', '136', '247', '135', '246',
 168                           '245', '244', '134', '243', '133', '242', '160',
 169                           # Dash audio
 170                           '141', '172', '140', '171', '139',
 171                           ]
 172     _available_formats_prefer_free = ['38', '46', '37', '45', '22', '44', '35', '43', '34', '18', '6', '5', '36', '17', '13',
 173                                       # Apple HTTP Live Streaming
 174                                       '96', '95', '94', '93', '92', '132', '151',
 175                                       # 3D
 176                                       '85', '102', '84', '101', '83', '100', '82',
 177                                       # Dash video
 178                                       '138', '248', '137', '247', '136', '246', '245',
 179                                       '244', '135', '243', '134', '242', '133', '160',
 180                                       # Dash audio
 181                                       '172', '141', '171', '140', '139',
 182                                       ]
 183     _video_formats_map = {
 184         'flv': ['35', '34', '6', '5'],
 185         '3gp': ['36', '17', '13'],
 186         'mp4': ['38', '37', '22', '18'],
 187         'webm': ['46', '45', '44', '43'],
 188     }
 189     _video_extensions = {
 190         '13': '3gp',
 191         '17': '3gp',
 192         '18': 'mp4',
 193         '22': 'mp4',
 194         '36': '3gp',
 195         '37': 'mp4',
 196         '38': 'mp4',
 197         '43': 'webm',
 198         '44': 'webm',
 199         '45': 'webm',
 200         '46': 'webm',
 201
 202         # 3d videos
 203         '82': 'mp4',
 204         '83': 'mp4',
 205         '84': 'mp4',
 206         '85': 'mp4',
 207         '100': 'webm',
 208         '101': 'webm',
 209         '102': 'webm',
 210
 211         # Apple HTTP Live Streaming
 212         '92': 'mp4',
 213         '93': 'mp4',
 214         '94': 'mp4',
 215         '95': 'mp4',
 216         '96': 'mp4',
 217         '132': 'mp4',
 218         '151': 'mp4',
 219
 220         # Dash mp4
 221         '133': 'mp4',
 222         '134': 'mp4',
 223         '135': 'mp4',
 224         '136': 'mp4',
 225         '137': 'mp4',
 226         '138': 'mp4',
 227         '139': 'mp4',
 228         '140': 'mp4',
 229         '141': 'mp4',
 230         '160': 'mp4',
 231
 232         # Dash webm
 233         '171': 'webm',
 234         '172': 'webm',
 235         '242': 'webm',
 236         '243': 'webm',
 237         '244': 'webm',
 238         '245': 'webm',
 239         '246': 'webm',
 240         '247': 'webm',
 241         '248': 'webm',
 242     }
 243     _video_dimensions = {
 244         '5': '240x400',
 245         '6': '???',
 246         '13': '???',
 247         '17': '144x176',
 248         '18': '360x640',
 249         '22': '720x1280',
 250         '34': '360x640',
 251         '35': '480x854',
 252         '36': '240x320',
 253         '37': '1080x1920',
 254         '38': '3072x4096',
 255         '43': '360x640',
 256         '44': '480x854',
 257         '45': '720x1280',
 258         '46': '1080x1920',
 259         '82': '360p',
 260         '83': '480p',
 261         '84': '720p',
 262         '85': '1080p',
 263         '92': '240p',
 264         '93': '360p',
 265         '94': '480p',
 266         '95': '720p',
 267         '96': '1080p',
 268         '100': '360p',
 269         '101': '480p',
 270         '102': '720p',
 271         '132': '240p',
 272         '151': '72p',
 273         '133': '240p',
 274         '134': '360p',
 275         '135': '480p',
 276         '136': '720p',
 277         '137': '1080p',
 278         '138': '>1080p',
 279         '139': '48k',
 280         '140': '128k',
 281         '141': '256k',
 282         '160': '192p',
 283         '171': '128k',
 284         '172': '256k',
 285         '242': '240p',
 286         '243': '360p',
 287         '244': '480p',
 288         '245': '480p',
 289         '246': '480p',
 290         '247': '720p',
 291         '248': '1080p',
 292     }
 293     _special_itags = {
 294         '82': '3D',
 295         '83': '3D',
 296         '84': '3D',
 297         '85': '3D',
 298         '100': '3D',
 299         '101': '3D',
 300         '102': '3D',
 301         '133': 'DASH Video',
 302         '134': 'DASH Video',
 303         '135': 'DASH Video',
 304         '136': 'DASH Video',
 305         '137': 'DASH Video',
 306         '138': 'DASH Video',
 307         '139': 'DASH Audio',
 308         '140': 'DASH Audio',
 309         '141': 'DASH Audio',
 310         '160': 'DASH Video',
 311         '171': 'DASH Audio',
 312         '172': 'DASH Audio',
 313         '242': 'DASH Video',
 314         '243': 'DASH Video',
 315         '244': 'DASH Video',
 316         '245': 'DASH Video',
 317         '246': 'DASH Video',
 318         '247': 'DASH Video',
 319         '248': 'DASH Video',
 320     }
 321
 322     IE_NAME = u'youtube'
 323     _TESTS = [
 324         {
 325             u"url":  u"http://www.youtube.com/watch?v=BaW_jenozKc",
 326             u"file":  u"BaW_jenozKc.mp4",
 327             u"info_dict": {
 328                 u"title": u"youtube-dl test video \"'/\\ä↭𝕐",
 329                 u"uploader": u"Philipp Hagemeister",
 330                 u"uploader_id": u"phihag",
 331                 u"upload_date": u"20121002",
 332                 u"description": u"test chars:  \"'/\\ä↭𝕐\n\nThis is a test video for youtube-dl.\n\nFor more information, contact phihag@phihag.de ."
 333             }
 334         },
 335         {
 336             u"url":  u"http://www.youtube.com/watch?v=1ltcDfZMA3U",
 337             u"file":  u"1ltcDfZMA3U.flv",
 338             u"note": u"Test VEVO video (#897)",
 339             u"info_dict": {
 340                 u"upload_date": u"20070518",
 341                 u"title": u"Maps - It Will Find You",
 342                 u"description": u"Music video by Maps performing It Will Find You.",
 343                 u"uploader": u"MuteUSA",
 344                 u"uploader_id": u"MuteUSA"
 345             }
 346         },
 347         {
 348             u"url":  u"http://www.youtube.com/watch?v=UxxajLWwzqY",
 349             u"file":  u"UxxajLWwzqY.mp4",
 350             u"note": u"Test generic use_cipher_signature video (#897)",
 351             u"info_dict": {
 352                 u"upload_date": u"20120506",
 353                 u"title": u"Icona Pop - I Love It (feat. Charli XCX) [OFFICIAL VIDEO]",
 354                 u"description": u"md5:3e2666e0a55044490499ea45fe9037b7",
 355                 u"uploader": u"Icona Pop",
 356                 u"uploader_id": u"IconaPop"
 357             }
 358         },
 359         {
 360             u"url":  u"https://www.youtube.com/watch?v=07FYdnEawAQ",
 361             u"file":  u"07FYdnEawAQ.mp4",
 362             u"note": u"Test VEVO video with age protection (#956)",
 363             u"info_dict": {
 364                 u"upload_date": u"20130703",
 365                 u"title": u"Justin Timberlake - Tunnel Vision (Explicit)",
 366                 u"description": u"md5:64249768eec3bc4276236606ea996373",
 367                 u"uploader": u"justintimberlakeVEVO",
 368                 u"uploader_id": u"justintimberlakeVEVO"
 369             }
 370         },
 371         {
 372             u'url': u'https://www.youtube.com/watch?v=TGi3HqYrWHE',
 373             u'file': u'TGi3HqYrWHE.mp4',
 374             u'note': u'm3u8 video',
 375             u'info_dict': {
 376                 u'title': u'Triathlon - Men - London 2012 Olympic Games',
 377                 u'description': u'- Men -  TR02 - Triathlon - 07 August 2012 - London 2012 Olympic Games',
 378                 u'uploader': u'olympic',
 379                 u'upload_date': u'20120807',
 380                 u'uploader_id': u'olympic',
 381             },
 382             u'params': {
 383                 u'skip_download': True,
 384             },
 385         },
 386     ]
 387
 388
 389     @classmethod
 390     def suitable(cls, url):
 391         """Receives a URL and returns True if suitable for this IE."""
 392         if YoutubePlaylistIE.suitable(url): return False
 393         return re.match(cls._VALID_URL, url, re.VERBOSE) is not None
 394
 395     def report_video_webpage_download(self, video_id):
 396         """Report attempt to download video webpage."""
 397         self.to_screen(u'%s: Downloading video webpage' % video_id)
 398
 399     def report_video_info_webpage_download(self, video_id):
 400         """Report attempt to download video info webpage."""
 401         self.to_screen(u'%s: Downloading video info webpage' % video_id)
 402
 403     def report_information_extraction(self, video_id):
 404         """Report attempt to extract video information."""
 405         self.to_screen(u'%s: Extracting video information' % video_id)
 406
 407     def report_unavailable_format(self, video_id, format):
 408         """Report extracted video URL."""
 409         self.to_screen(u'%s: Format %s not available' % (video_id, format))
 410
 411     def report_rtmp_download(self):
 412         """Indicate the download will use the RTMP protocol."""
 413         self.to_screen(u'RTMP download detected')
 414
 415     def _decrypt_signature(self, s):
 416         """Turn the encrypted s field into a working signature"""
 417
 418         if len(s) == 92:
 419             return s[25] + s[3:25] + s[0] + s[26:42] + s[79] + s[43:79] + s[91] + s[80:83]
 420         elif len(s) == 90:
 421             return s[25] + s[3:25] + s[2] + s[26:40] + s[77] + s[41:77] + s[89] + s[78:81]
 422         elif len(s) == 89:
 423             return s[84:78:-1] + s[87] + s[77:60:-1] + s[0] + s[59:3:-1]
 424         elif len(s) == 88:
 425             return s[7:28] + s[87] + s[29:45] + s[55] + s[46:55] + s[2] + s[56:87] + s[28]
 426         elif len(s) == 87:
 427             return s[6:27] + s[4] + s[28:39] + s[27] + s[40:59] + s[2] + s[60:]
 428         elif len(s) == 86:
 429             return s[5:34] + s[0] + s[35:38] + s[3] + s[39:45] + s[38] + s[46:53] + s[73] + s[54:73] + s[85] + s[74:85] + s[53]
 430         elif len(s) == 85:
 431             return s[40] + s[82:43:-1] + s[22] + s[42:40:-1] + s[83] + s[39:22:-1] + s[0] + s[21:2:-1]
 432         elif len(s) == 84:
 433             return s[81:36:-1] + s[0] + s[35:2:-1]
 434         elif len(s) == 83:
 435             return s[81:64:-1] + s[82] + s[63:52:-1] + s[45] + s[51:45:-1] + s[1] + s[44:1:-1] + s[0]
 436         elif len(s) == 82:
 437             return s[80:73:-1] + s[81] + s[72:54:-1] + s[2] + s[53:43:-1] + s[0] + s[42:2:-1] + s[43] + s[1] + s[54]
 438         elif len(s) == 81:
 439             return s[56] + s[79:56:-1] + s[41] + s[55:41:-1] + s[80] + s[40:34:-1] + s[0] + s[33:29:-1] + s[34] + s[28:9:-1] + s[29] + s[8:0:-1] + s[9]
 440         elif len(s) == 80:
 441             return s[1:19] + s[0] + s[20:68] + s[19] + s[69:80]
 442         elif len(s) == 79:
 443             return s[54] + s[77:54:-1] + s[39] + s[53:39:-1] + s[78] + s[38:34:-1] + s[0] + s[33:29:-1] + s[34] + s[28:9:-1] + s[29] + s[8:0:-1] + s[9]
 444
 445         else:
 446             raise ExtractorError(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s)))
 447
 448     def _decrypt_signature_age_gate(self, s):
 449         # The videos with age protection use another player, so the algorithms
 450         # can be different.
 451         if len(s) == 86:
 452             return s[2:63] + s[82] + s[64:82] + s[63]
 453         else:
 454             # Fallback to the other algortihms
 455             return self._decrypt_signature(s)
 456
 457     def _get_available_subtitles(self, video_id):
 458         try:
 459             sub_list = self._download_webpage(
 460                 'http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id,
 461                 video_id, note=False)
 462         except ExtractorError as err:
 463             self._downloader.report_warning(u'unable to download video subtitles: %s' % compat_str(err))
 464             return {}
 465         lang_list = re.findall(r'name="([^"]*)"[^>]+lang_code="([\w\-]+)"', sub_list)
 466
 467         sub_lang_list = {}
 468         for l in lang_list:
 469             lang = l[1]
 470             params = compat_urllib_parse.urlencode({
 471                 'lang': lang,
 472                 'v': video_id,
 473                 'fmt': self._downloader.params.get('subtitlesformat'),
 474             })
 475             url = u'http://www.youtube.com/api/timedtext?' + params
 476             sub_lang_list[lang] = url
 477         if not sub_lang_list:
 478             self._downloader.report_warning(u'video doesn\'t have subtitles')
 479             return {}
 480         return sub_lang_list
 481
 482     def _get_available_automatic_caption(self, video_id, webpage):
 483         """We need the webpage for getting the captions url, pass it as an
 484            argument to speed up the process."""
 485         sub_format = self._downloader.params.get('subtitlesformat')
 486         self.to_screen(u'%s: Looking for automatic captions' % video_id)
 487         mobj = re.search(r';ytplayer.config = ({.*?});', webpage)
 488         err_msg = u'Couldn\'t find automatic captions for %s' % video_id
 489         if mobj is None:
 490             self._downloader.report_warning(err_msg)
 491             return {}
 492         player_config = json.loads(mobj.group(1))
 493         try:
 494             args = player_config[u'args']
 495             caption_url = args[u'ttsurl']
 496             timestamp = args[u'timestamp']
 497             # We get the available subtitles
 498             list_params = compat_urllib_parse.urlencode({
 499                 'type': 'list',
 500                 'tlangs': 1,
 501                 'asrs': 1,
 502             })
 503             list_url = caption_url + '&' + list_params
 504             list_page = self._download_webpage(list_url, video_id)
 505             caption_list = xml.etree.ElementTree.fromstring(list_page.encode('utf-8'))
 506             original_lang_node = caption_list.find('track')
 507             if original_lang_node.attrib.get('kind') != 'asr' :
 508                 self._downloader.report_warning(u'Video doesn\'t have automatic captions')
 509                 return {}
 510             original_lang = original_lang_node.attrib['lang_code']
 511
 512             sub_lang_list = {}
 513             for lang_node in caption_list.findall('target'):
 514                 sub_lang = lang_node.attrib['lang_code']
 515                 params = compat_urllib_parse.urlencode({
 516                     'lang': original_lang,
 517                     'tlang': sub_lang,
 518                     'fmt': sub_format,
 519                     'ts': timestamp,
 520                     'kind': 'asr',
 521                 })
 522                 sub_lang_list[sub_lang] = caption_url + '&' + params
 523             return sub_lang_list
 524         # An extractor error can be raise by the download process if there are
 525         # no automatic captions but there are subtitles
 526         except (KeyError, ExtractorError):
 527             self._downloader.report_warning(err_msg)
 528             return {}
 529
 530     def _print_formats(self, formats):
 531         print('Available formats:')
 532         for x in formats:
 533             print('%s\t:\t%s\t[%s]%s' %(x, self._video_extensions.get(x, 'flv'),
 534                                         self._video_dimensions.get(x, '???'),
 535                                         ' ('+self._special_itags[x]+')' if x in self._special_itags else ''))
 536
 537     def _extract_id(self, url):
 538         mobj = re.match(self._VALID_URL, url, re.VERBOSE)
 539         if mobj is None:
 540             raise ExtractorError(u'Invalid URL: %s' % url)
 541         video_id = mobj.group(2)
 542         return video_id
 543
 544     def _get_video_url_list(self, url_map):
 545         """
 546         Transform a dictionary in the format {itag:url} to a list of (itag, url)
 547         with the requested formats.
 548         """
 549         req_format = self._downloader.params.get('format', None)
 550         format_limit = self._downloader.params.get('format_limit', None)
 551         available_formats = self._available_formats_prefer_free if self._downloader.params.get('prefer_free_formats', False) else self._available_formats
 552         if format_limit is not None and format_limit in available_formats:
 553             format_list = available_formats[available_formats.index(format_limit):]
 554         else:
 555             format_list = available_formats
 556         existing_formats = [x for x in format_list if x in url_map]
 557         if len(existing_formats) == 0:
 558             raise ExtractorError(u'no known formats available for video')
 559         if self._downloader.params.get('listformats', None):
 560             self._print_formats(existing_formats)
 561             return
 562         if req_format is None or req_format == 'best':
 563             video_url_list = [(existing_formats[0], url_map[existing_formats[0]])] # Best quality
 564         elif req_format == 'worst':
 565             video_url_list = [(existing_formats[-1], url_map[existing_formats[-1]])] # worst quality
 566         elif req_format in ('-1', 'all'):
 567             video_url_list = [(f, url_map[f]) for f in existing_formats] # All formats
 568         else:
 569             # Specific formats. We pick the first in a slash-delimeted sequence.
 570             # Format can be specified as itag or 'mp4' or 'flv' etc. We pick the highest quality
 571             # available in the specified format. For example,
 572             # if '1/2/3/4' is requested and '2' and '4' are available, we pick '2'.
 573             # if '1/mp4/3/4' is requested and '1' and '5' (is a mp4) are available, we pick '1'.
 574             # if '1/mp4/3/4' is requested and '4' and '5' (is a mp4) are available, we pick '5'.
 575             req_formats = req_format.split('/')
 576             video_url_list = None
 577             for rf in req_formats:
 578                 if rf in url_map:
 579                     video_url_list = [(rf, url_map[rf])]
 580                     break
 581                 if rf in self._video_formats_map:
 582                     for srf in self._video_formats_map[rf]:
 583                         if srf in url_map:
 584                             video_url_list = [(srf, url_map[srf])]
 585                             break
 586                     else:
 587                         continue
 588                     break
 589             if video_url_list is None:
 590                 raise ExtractorError(u'requested format not available')
 591         return video_url_list
 592
 593     def _extract_from_m3u8(self, manifest_url, video_id):
 594         url_map = {}
 595         def _get_urls(_manifest):
 596             lines = _manifest.split('\n')
 597             urls = filter(lambda l: l and not l.startswith('#'),
 598                             lines)
 599             return urls
 600         manifest = self._download_webpage(manifest_url, video_id, u'Downloading formats manifest')
 601         formats_urls = _get_urls(manifest)
 602         for format_url in formats_urls:
 603             itag = self._search_regex(r'itag/(\d+?)/', format_url, 'itag')
 604             url_map[itag] = format_url
 605         return url_map
 606
 607     def _real_extract(self, url):
 608         if re.match(r'(?:https?://)?[^/]+/watch\?feature=[a-z_]+$', url):
 609             self._downloader.report_warning(u'Did you forget to quote the URL? Remember that & is a meta-character in most shells, so you want to put the URL in quotes, like  youtube-dl \'http://www.youtube.com/watch?feature=foo&v=BaW_jenozKc\' (or simply  youtube-dl BaW_jenozKc  ).')
 610
 611         # Extract original video URL from URL with redirection, like age verification, using next_url parameter
 612         mobj = re.search(self._NEXT_URL_RE, url)
 613         if mobj:
 614             url = 'https://www.youtube.com/' + compat_urllib_parse.unquote(mobj.group(1)).lstrip('/')
 615         video_id = self._extract_id(url)
 616
 617         # Get video webpage
 618         self.report_video_webpage_download(video_id)
 619         url = 'https://www.youtube.com/watch?v=%s&gl=US&hl=en&has_verified=1' % video_id
 620         request = compat_urllib_request.Request(url)
 621         try:
 622             video_webpage_bytes = compat_urllib_request.urlopen(request).read()
 623         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 624             raise ExtractorError(u'Unable to download video webpage: %s' % compat_str(err))
 625
 626         video_webpage = video_webpage_bytes.decode('utf-8', 'ignore')
 627
 628         # Attempt to extract SWF player URL
 629         mobj = re.search(r'swfConfig.*?"(http:\\/\\/.*?watch.*?-.*?\.swf)"', video_webpage)
 630         if mobj is not None:
 631             player_url = re.sub(r'\\(.)', r'\1', mobj.group(1))
 632         else:
 633             player_url = None
 634
 635         # Get video info
 636         self.report_video_info_webpage_download(video_id)
 637         if re.search(r'player-age-gate-content">', video_webpage) is not None:
 638             self.report_age_confirmation()
 639             age_gate = True
 640             # We simulate the access to the video from www.youtube.com/v/{video_id}
 641             # this can be viewed without login into Youtube
 642             data = compat_urllib_parse.urlencode({'video_id': video_id,
 643                                                   'el': 'embedded',
 644                                                   'gl': 'US',
 645                                                   'hl': 'en',
 646                                                   'eurl': 'https://youtube.googleapis.com/v/' + video_id,
 647                                                   'asv': 3,
 648                                                   'sts':'1588',
 649                                                   })
 650             video_info_url = 'https://www.youtube.com/get_video_info?' + data
 651             video_info_webpage = self._download_webpage(video_info_url, video_id,
 652                                     note=False,
 653                                     errnote='unable to download video info webpage')
 654             video_info = compat_parse_qs(video_info_webpage)
 655         else:
 656             age_gate = False
 657             for el_type in ['&el=embedded', '&el=detailpage', '&el=vevo', '']:
 658                 video_info_url = ('https://www.youtube.com/get_video_info?&video_id=%s%s&ps=default&eurl=&gl=US&hl=en'
 659                         % (video_id, el_type))
 660                 video_info_webpage = self._download_webpage(video_info_url, video_id,
 661                                         note=False,
 662                                         errnote='unable to download video info webpage')
 663                 video_info = compat_parse_qs(video_info_webpage)
 664                 if 'token' in video_info:
 665                     break
 666         if 'token' not in video_info:
 667             if 'reason' in video_info:
 668                 raise ExtractorError(u'YouTube said: %s' % video_info['reason'][0], expected=True)
 669             else:
 670                 raise ExtractorError(u'"token" parameter not in video info for unknown reason')
 671
 672         # Check for "rental" videos
 673         if 'ypc_video_rental_bar_text' in video_info and 'author' not in video_info:
 674             raise ExtractorError(u'"rental" videos not supported')
 675
 676         # Start extracting information
 677         self.report_information_extraction(video_id)
 678
 679         # uploader
 680         if 'author' not in video_info:
 681             raise ExtractorError(u'Unable to extract uploader name')
 682         video_uploader = compat_urllib_parse.unquote_plus(video_info['author'][0])
 683
 684         # uploader_id
 685         video_uploader_id = None
 686         mobj = re.search(r'<link itemprop="url" href="http://www.youtube.com/(?:user|channel)/([^"]+)">', video_webpage)
 687         if mobj is not None:
 688             video_uploader_id = mobj.group(1)
 689         else:
 690             self._downloader.report_warning(u'unable to extract uploader nickname')
 691
 692         # title
 693         if 'title' not in video_info:
 694             raise ExtractorError(u'Unable to extract video title')
 695         video_title = compat_urllib_parse.unquote_plus(video_info['title'][0])
 696
 697         # thumbnail image
 698         # We try first to get a high quality image:
 699         m_thumb = re.search(r'<span itemprop="thumbnail".*?href="(.*?)">',
 700                             video_webpage, re.DOTALL)
 701         if m_thumb is not None:
 702             video_thumbnail = m_thumb.group(1)
 703         elif 'thumbnail_url' not in video_info:
 704             self._downloader.report_warning(u'unable to extract video thumbnail')
 705             video_thumbnail = ''
 706         else:   # don't panic if we can't find it
 707             video_thumbnail = compat_urllib_parse.unquote_plus(video_info['thumbnail_url'][0])
 708
 709         # upload date
 710         upload_date = None
 711         mobj = re.search(r'id="eow-date.*?>(.*?)</span>', video_webpage, re.DOTALL)
 712         if mobj is not None:
 713             upload_date = ' '.join(re.sub(r'[/,-]', r' ', mobj.group(1)).split())
 714             upload_date = unified_strdate(upload_date)
 715
 716         # description
 717         video_description = get_element_by_id("eow-description", video_webpage)
 718         if video_description:
 719             video_description = clean_html(video_description)
 720         else:
 721             fd_mobj = re.search(r'<meta name="description" content="([^"]+)"', video_webpage)
 722             if fd_mobj:
 723                 video_description = unescapeHTML(fd_mobj.group(1))
 724             else:
 725                 video_description = u''
 726
 727         # subtitles
 728         video_subtitles = self.extract_subtitles(video_id, video_webpage)
 729
 730         if self._downloader.params.get('listsubtitles', False):
 731             self._list_available_subtitles(video_id, video_webpage)
 732             return
 733
 734         if 'length_seconds' not in video_info:
 735             self._downloader.report_warning(u'unable to extract video duration')
 736             video_duration = ''
 737         else:
 738             video_duration = compat_urllib_parse.unquote_plus(video_info['length_seconds'][0])
 739
 740         # Decide which formats to download
 741
 742         try:
 743             mobj = re.search(r';ytplayer.config = ({.*?});', video_webpage)
 744             if not mobj:
 745                 raise ValueError('Could not find vevo ID')
 746             info = json.loads(mobj.group(1))
 747             args = info['args']
 748             # Easy way to know if the 's' value is in url_encoded_fmt_stream_map
 749             # this signatures are encrypted
 750             m_s = re.search(r'[&,]s=', args['url_encoded_fmt_stream_map'])
 751             if m_s is not None:
 752                 self.to_screen(u'%s: Encrypted signatures detected.' % video_id)
 753                 video_info['url_encoded_fmt_stream_map'] = [args['url_encoded_fmt_stream_map']]
 754             m_s = re.search(r'[&,]s=', args.get('adaptive_fmts', u''))
 755             if m_s is not None:
 756                 if 'url_encoded_fmt_stream_map' in video_info:
 757                     video_info['url_encoded_fmt_stream_map'][0] += ',' + args['adaptive_fmts']
 758                 else:
 759                     video_info['url_encoded_fmt_stream_map'] = [args['adaptive_fmts']]
 760             elif 'adaptive_fmts' in video_info:
 761                 if 'url_encoded_fmt_stream_map' in video_info:
 762                     video_info['url_encoded_fmt_stream_map'][0] += ',' + video_info['adaptive_fmts'][0]
 763                 else:
 764                     video_info['url_encoded_fmt_stream_map'] = video_info['adaptive_fmts']
 765         except ValueError:
 766             pass
 767
 768         if 'conn' in video_info and video_info['conn'][0].startswith('rtmp'):
 769             self.report_rtmp_download()
 770             video_url_list = [(None, video_info['conn'][0])]
 771         elif 'url_encoded_fmt_stream_map' in video_info and len(video_info['url_encoded_fmt_stream_map']) >= 1:
 772             if 'rtmpe%3Dyes' in video_info['url_encoded_fmt_stream_map'][0]:
 773                 raise ExtractorError('rtmpe downloads are not supported, see https://github.com/rg3/youtube-dl/issues/343 for more information.', expected=True)
 774             url_map = {}
 775             for url_data_str in video_info['url_encoded_fmt_stream_map'][0].split(','):
 776                 url_data = compat_parse_qs(url_data_str)
 777                 if 'itag' in url_data and 'url' in url_data:
 778                     url = url_data['url'][0]
 779                     if 'sig' in url_data:
 780                         url += '&signature=' + url_data['sig'][0]
 781                     elif 's' in url_data:
 782                         if self._downloader.params.get('verbose'):
 783                             s = url_data['s'][0]
 784                             if age_gate:
 785                                 player_version = self._search_regex(r'ad3-(.+?)\.swf',
 786                                     video_info['ad3_module'][0] if 'ad3_module' in video_info else 'NOT FOUND',
 787                                     'flash player', fatal=False)
 788                                 player = 'flash player %s' % player_version
 789                             else:
 790                                 player = u'html5 player %s' % self._search_regex(r'html5player-(.+?)\.js', video_webpage,
 791                                     'html5 player', fatal=False)
 792                             parts_sizes = u'.'.join(compat_str(len(part)) for part in s.split('.'))
 793                             self.to_screen(u'encrypted signature length %d (%s), itag %s, %s' %
 794                                 (len(s), parts_sizes, url_data['itag'][0], player))
 795                         encrypted_sig = url_data['s'][0]
 796                         if age_gate:
 797                             signature = self._decrypt_signature_age_gate(encrypted_sig)
 798                         else:
 799                             signature = self._decrypt_signature(encrypted_sig)
 800                         url += '&signature=' + signature
 801                     if 'ratebypass' not in url:
 802                         url += '&ratebypass=yes'
 803                     url_map[url_data['itag'][0]] = url
 804             video_url_list = self._get_video_url_list(url_map)
 805             if not video_url_list:
 806                 return
 807         elif video_info.get('hlsvp'):
 808             manifest_url = video_info['hlsvp'][0]
 809             url_map = self._extract_from_m3u8(manifest_url, video_id)
 810             video_url_list = self._get_video_url_list(url_map)
 811             if not video_url_list:
 812                 return
 813
 814         else:
 815             raise ExtractorError(u'no conn or url_encoded_fmt_stream_map information found in video info')
 816
 817         results = []
 818         for format_param, video_real_url in video_url_list:
 819             # Extension
 820             video_extension = self._video_extensions.get(format_param, 'flv')
 821
 822             video_format = '{0} - {1}{2}'.format(format_param if format_param else video_extension,
 823                                               self._video_dimensions.get(format_param, '???'),
 824                                               ' ('+self._special_itags[format_param]+')' if format_param in self._special_itags else '')
 825
 826             results.append({
 827                 'id':       video_id,
 828                 'url':      video_real_url,
 829                 'uploader': video_uploader,
 830                 'uploader_id': video_uploader_id,
 831                 'upload_date':  upload_date,
 832                 'title':    video_title,
 833                 'ext':      video_extension,
 834                 'format':   video_format,
 835                 'thumbnail':    video_thumbnail,
 836                 'description':  video_description,
 837                 'player_url':   player_url,
 838                 'subtitles':    video_subtitles,
 839                 'duration':     video_duration
 840             })
 841         return results
 842
 843 class YoutubePlaylistIE(InfoExtractor):
 844     IE_DESC = u'YouTube.com playlists'
 845     _VALID_URL = r"""(?:
 846                         (?:https?://)?
 847                         (?:\w+\.)?
 848                         youtube\.com/
 849                         (?:
 850                            (?:course|view_play_list|my_playlists|artist|playlist|watch)
 851                            \? (?:.*?&)*? (?:p|a|list)=
 852                         |  p/
 853                         )
 854                         ((?:PL|EC|UU|FL)?[0-9A-Za-z-_]{10,})
 855                         .*
 856                      |
 857                         ((?:PL|EC|UU|FL)[0-9A-Za-z-_]{10,})
 858                      )"""
 859     _TEMPLATE_URL = 'https://gdata.youtube.com/feeds/api/playlists/%s?max-results=%i&start-index=%i&v=2&alt=json&safeSearch=none'
 860     _MAX_RESULTS = 50
 861     IE_NAME = u'youtube:playlist'
 862
 863     @classmethod
 864     def suitable(cls, url):
 865         """Receives a URL and returns True if suitable for this IE."""
 866         return re.match(cls._VALID_URL, url, re.VERBOSE) is not None
 867
 868     def _real_extract(self, url):
 869         # Extract playlist id
 870         mobj = re.match(self._VALID_URL, url, re.VERBOSE)
 871         if mobj is None:
 872             raise ExtractorError(u'Invalid URL: %s' % url)
 873
 874         # Download playlist videos from API
 875         playlist_id = mobj.group(1) or mobj.group(2)
 876         videos = []
 877
 878         for page_num in itertools.count(1):
 879             start_index = self._MAX_RESULTS * (page_num - 1) + 1
 880             if start_index >= 1000:
 881                 self._downloader.report_warning(u'Max number of results reached')
 882                 break
 883             url = self._TEMPLATE_URL % (playlist_id, self._MAX_RESULTS, start_index)
 884             page = self._download_webpage(url, playlist_id, u'Downloading page #%s' % page_num)
 885
 886             try:
 887                 response = json.loads(page)
 888             except ValueError as err:
 889                 raise ExtractorError(u'Invalid JSON in API response: ' + compat_str(err))
 890
 891             if 'feed' not in response:
 892                 raise ExtractorError(u'Got a malformed response from YouTube API')
 893             playlist_title = response['feed']['title']['$t']
 894             if 'entry' not in response['feed']:
 895                 # Number of videos is a multiple of self._MAX_RESULTS
 896                 break
 897
 898             for entry in response['feed']['entry']:
 899                 index = entry['yt$position']['$t']
 900                 if 'media$group' in entry and 'yt$videoid' in entry['media$group']:
 901                     videos.append((
 902                         index,
 903                         'https://www.youtube.com/watch?v=' + entry['media$group']['yt$videoid']['$t']
 904                     ))
 905
 906         videos = [v[1] for v in sorted(videos)]
 907
 908         url_results = [self.url_result(vurl, 'Youtube') for vurl in videos]
 909         return [self.playlist_result(url_results, playlist_id, playlist_title)]
 910
 911
 912 class YoutubeChannelIE(InfoExtractor):
 913     IE_DESC = u'YouTube.com channels'
 914     _VALID_URL = r"^(?:https?://)?(?:youtu\.be|(?:\w+\.)?youtube(?:-nocookie)?\.com)/channel/([0-9A-Za-z_-]+)"
 915     _TEMPLATE_URL = 'http://www.youtube.com/channel/%s/videos?sort=da&flow=list&view=0&page=%s&gl=US&hl=en'
 916     _MORE_PAGES_INDICATOR = 'yt-uix-load-more'
 917     _MORE_PAGES_URL = 'http://www.youtube.com/c4_browse_ajax?action_load_more_videos=1&flow=list&paging=%s&view=0&sort=da&channel_id=%s'
 918     IE_NAME = u'youtube:channel'
 919
 920     def extract_videos_from_page(self, page):
 921         ids_in_page = []
 922         for mobj in re.finditer(r'href="/watch\?v=([0-9A-Za-z_-]+)&?', page):
 923             if mobj.group(1) not in ids_in_page:
 924                 ids_in_page.append(mobj.group(1))
 925         return ids_in_page
 926
 927     def _real_extract(self, url):
 928         # Extract channel id
 929         mobj = re.match(self._VALID_URL, url)
 930         if mobj is None:
 931             raise ExtractorError(u'Invalid URL: %s' % url)
 932
 933         # Download channel page
 934         channel_id = mobj.group(1)
 935         video_ids = []
 936         pagenum = 1
 937
 938         url = self._TEMPLATE_URL % (channel_id, pagenum)
 939         page = self._download_webpage(url, channel_id,
 940                                       u'Downloading page #%s' % pagenum)
 941
 942         # Extract video identifiers
 943         ids_in_page = self.extract_videos_from_page(page)
 944         video_ids.extend(ids_in_page)
 945
 946         # Download any subsequent channel pages using the json-based channel_ajax query
 947         if self._MORE_PAGES_INDICATOR in page:
 948             for pagenum in itertools.count(1):
 949                 url = self._MORE_PAGES_URL % (pagenum, channel_id)
 950                 page = self._download_webpage(url, channel_id,
 951                                               u'Downloading page #%s' % pagenum)
 952
 953                 page = json.loads(page)
 954
 955                 ids_in_page = self.extract_videos_from_page(page['content_html'])
 956                 video_ids.extend(ids_in_page)
 957
 958                 if self._MORE_PAGES_INDICATOR  not in page['load_more_widget_html']:
 959                     break
 960
 961         self._downloader.to_screen(u'[youtube] Channel %s: Found %i videos' % (channel_id, len(video_ids)))
 962
 963         urls = ['http://www.youtube.com/watch?v=%s' % id for id in video_ids]
 964         url_entries = [self.url_result(eurl, 'Youtube') for eurl in urls]
 965         return [self.playlist_result(url_entries, channel_id)]
 966
 967
 968 class YoutubeUserIE(InfoExtractor):
 969     IE_DESC = u'YouTube.com user videos (URL or "ytuser" keyword)'
 970     _VALID_URL = r'(?:(?:(?:https?://)?(?:\w+\.)?youtube\.com/(?:user/)?)|ytuser:)(?!feed/)([A-Za-z0-9_-]+)'
 971     _TEMPLATE_URL = 'http://gdata.youtube.com/feeds/api/users/%s'
 972     _GDATA_PAGE_SIZE = 50
 973     _GDATA_URL = 'http://gdata.youtube.com/feeds/api/users/%s/uploads?max-results=%d&start-index=%d&alt=json'
 974     IE_NAME = u'youtube:user'
 975
 976     @classmethod
 977     def suitable(cls, url):
 978         # Don't return True if the url can be extracted with other youtube
 979         # extractor, the regex would is too permissive and it would match.
 980         other_ies = iter(klass for (name, klass) in globals().items() if name.endswith('IE') and klass is not cls)
 981         if any(ie.suitable(url) for ie in other_ies): return False
 982         else: return super(YoutubeUserIE, cls).suitable(url)
 983
 984     def _real_extract(self, url):
 985         # Extract username
 986         mobj = re.match(self._VALID_URL, url)
 987         if mobj is None:
 988             raise ExtractorError(u'Invalid URL: %s' % url)
 989
 990         username = mobj.group(1)
 991
 992         # Download video ids using YouTube Data API. Result size per
 993         # query is limited (currently to 50 videos) so we need to query
 994         # page by page until there are no video ids - it means we got
 995         # all of them.
 996
 997         video_ids = []
 998
 999         for pagenum in itertools.count(0):
1000             start_index = pagenum * self._GDATA_PAGE_SIZE + 1
1001
1002             gdata_url = self._GDATA_URL % (username, self._GDATA_PAGE_SIZE, start_index)
1003             page = self._download_webpage(gdata_url, username,
1004                                           u'Downloading video ids from %d to %d' % (start_index, start_index + self._GDATA_PAGE_SIZE))
1005
1006             try:
1007                 response = json.loads(page)
1008             except ValueError as err:
1009                 raise ExtractorError(u'Invalid JSON in API response: ' + compat_str(err))
1010
1011             # Extract video identifiers
1012             ids_in_page = []
1013             for entry in response['feed']['entry']:
1014                 ids_in_page.append(entry['id']['$t'].split('/')[-1])
1015             video_ids.extend(ids_in_page)
1016
1017             # A little optimization - if current page is not
1018             # "full", ie. does not contain PAGE_SIZE video ids then
1019             # we can assume that this page is the last one - there
1020             # are no more ids on further pages - no need to query
1021             # again.
1022
1023             if len(ids_in_page) < self._GDATA_PAGE_SIZE:
1024                 break
1025
1026         urls = ['http://www.youtube.com/watch?v=%s' % video_id for video_id in video_ids]
1027         url_results = [self.url_result(rurl, 'Youtube') for rurl in urls]
1028         return [self.playlist_result(url_results, playlist_title = username)]
1029
1030 class YoutubeSearchIE(SearchInfoExtractor):
1031     IE_DESC = u'YouTube.com searches'
1032     _API_URL = 'https://gdata.youtube.com/feeds/api/videos?q=%s&start-index=%i&max-results=50&v=2&alt=jsonc'
1033     _MAX_RESULTS = 1000
1034     IE_NAME = u'youtube:search'
1035     _SEARCH_KEY = 'ytsearch'
1036
1037     def report_download_page(self, query, pagenum):
1038         """Report attempt to download search page with given number."""
1039         self._downloader.to_screen(u'[youtube] query "%s": Downloading page %s' % (query, pagenum))
1040
1041     def _get_n_results(self, query, n):
1042         """Get a specified number of results for a query"""
1043
1044         video_ids = []
1045         pagenum = 0
1046         limit = n
1047
1048         while (50 * pagenum) < limit:
1049             self.report_download_page(query, pagenum+1)
1050             result_url = self._API_URL % (compat_urllib_parse.quote_plus(query), (50*pagenum)+1)
1051             request = compat_urllib_request.Request(result_url)
1052             try:
1053                 data = compat_urllib_request.urlopen(request).read().decode('utf-8')
1054             except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
1055                 raise ExtractorError(u'Unable to download API page: %s' % compat_str(err))
1056             api_response = json.loads(data)['data']
1057
1058             if not 'items' in api_response:
1059                 raise ExtractorError(u'[youtube] No video results')
1060
1061             new_ids = list(video['id'] for video in api_response['items'])
1062             video_ids += new_ids
1063
1064             limit = min(n, api_response['totalItems'])
1065             pagenum += 1
1066
1067         if len(video_ids) > n:
1068             video_ids = video_ids[:n]
1069         videos = [self.url_result('http://www.youtube.com/watch?v=%s' % id, 'Youtube') for id in video_ids]
1070         return self.playlist_result(videos, query)
1071
1072
1073 class YoutubeShowIE(InfoExtractor):
1074     IE_DESC = u'YouTube.com (multi-season) shows'
1075     _VALID_URL = r'https?://www\.youtube\.com/show/(.*)'
1076     IE_NAME = u'youtube:show'
1077
1078     def _real_extract(self, url):
1079         mobj = re.match(self._VALID_URL, url)
1080         show_name = mobj.group(1)
1081         webpage = self._download_webpage(url, show_name, u'Downloading show webpage')
1082         # There's one playlist for each season of the show
1083         m_seasons = list(re.finditer(r'href="(/playlist\?list=.*?)"', webpage))
1084         self.to_screen(u'%s: Found %s seasons' % (show_name, len(m_seasons)))
1085         return [self.url_result('https://www.youtube.com' + season.group(1), 'YoutubePlaylist') for season in m_seasons]
1086
1087
1088 class YoutubeFeedsInfoExtractor(YoutubeBaseInfoExtractor):
1089     """
1090     Base class for extractors that fetch info from
1091     http://www.youtube.com/feed_ajax
1092     Subclasses must define the _FEED_NAME and _PLAYLIST_TITLE properties.
1093     """
1094     _LOGIN_REQUIRED = True
1095     _PAGING_STEP = 30
1096     # use action_load_personal_feed instead of action_load_system_feed
1097     _PERSONAL_FEED = False
1098
1099     @property
1100     def _FEED_TEMPLATE(self):
1101         action = 'action_load_system_feed'
1102         if self._PERSONAL_FEED:
1103             action = 'action_load_personal_feed'
1104         return 'http://www.youtube.com/feed_ajax?%s=1&feed_name=%s&paging=%%s' % (action, self._FEED_NAME)
1105
1106     @property
1107     def IE_NAME(self):
1108         return u'youtube:%s' % self._FEED_NAME
1109
1110     def _real_initialize(self):
1111         self._login()
1112
1113     def _real_extract(self, url):
1114         feed_entries = []
1115         # The step argument is available only in 2.7 or higher
1116         for i in itertools.count(0):
1117             paging = i*self._PAGING_STEP
1118             info = self._download_webpage(self._FEED_TEMPLATE % paging,
1119                                           u'%s feed' % self._FEED_NAME,
1120                                           u'Downloading page %s' % i)
1121             info = json.loads(info)
1122             feed_html = info['feed_html']
1123             m_ids = re.finditer(r'"/watch\?v=(.*?)["&]', feed_html)
1124             ids = orderedSet(m.group(1) for m in m_ids)
1125             feed_entries.extend(self.url_result(id, 'Youtube') for id in ids)
1126             if info['paging'] is None:
1127                 break
1128         return self.playlist_result(feed_entries, playlist_title=self._PLAYLIST_TITLE)
1129
1130 class YoutubeSubscriptionsIE(YoutubeFeedsInfoExtractor):
1131     IE_DESC = u'YouTube.com subscriptions feed, "ytsubs" keyword(requires authentication)'
1132     _VALID_URL = r'https?://www\.youtube\.com/feed/subscriptions|:ytsubs(?:criptions)?'
1133     _FEED_NAME = 'subscriptions'
1134     _PLAYLIST_TITLE = u'Youtube Subscriptions'
1135
1136 class YoutubeRecommendedIE(YoutubeFeedsInfoExtractor):
1137     IE_DESC = u'YouTube.com recommended videos, "ytrec" keyword (requires authentication)'
1138     _VALID_URL = r'https?://www\.youtube\.com/feed/recommended|:ytrec(?:ommended)?'
1139     _FEED_NAME = 'recommended'
1140     _PLAYLIST_TITLE = u'Youtube Recommended videos'
1141
1142 class YoutubeWatchLaterIE(YoutubeFeedsInfoExtractor):
1143     IE_DESC = u'Youtube watch later list, "ytwatchlater" keyword (requires authentication)'
1144     _VALID_URL = r'https?://www\.youtube\.com/feed/watch_later|:ytwatchlater'
1145     _FEED_NAME = 'watch_later'
1146     _PLAYLIST_TITLE = u'Youtube Watch Later'
1147     _PAGING_STEP = 100
1148     _PERSONAL_FEED = True
1149
1150 class YoutubeFavouritesIE(YoutubeBaseInfoExtractor):
1151     IE_NAME = u'youtube:favorites'
1152     IE_DESC = u'YouTube.com favourite videos, "ytfav" keyword (requires authentication)'
1153     _VALID_URL = r'https?://www\.youtube\.com/my_favorites|:ytfav(?:ou?rites)?'
1154     _LOGIN_REQUIRED = True
1155
1156     def _real_extract(self, url):
1157         webpage = self._download_webpage('https://www.youtube.com/my_favorites', 'Youtube Favourites videos')
1158         playlist_id = self._search_regex(r'list=(.+?)["&]', webpage, u'favourites playlist id')
1159         return self.url_result(playlist_id, 'YoutubePlaylist')