youtube_dl/extractor/youtube.py

   1 # coding: utf-8
   2
   3 import json
   4 import netrc
   5 import re
   6 import socket
   7
   8 from .common import InfoExtractor, SearchInfoExtractor
   9 from ..utils import (
  10     compat_http_client,
  11     compat_parse_qs,
  12     compat_urllib_error,
  13     compat_urllib_parse,
  14     compat_urllib_request,
  15     compat_str,
  16
  17     clean_html,
  18     get_element_by_id,
  19     ExtractorError,
  20     unescapeHTML,
  21     unified_strdate,
  22 )
  23
  24
  25 class YoutubeIE(InfoExtractor):
  26     """Information extractor for youtube.com."""
  27
  28     _VALID_URL = r"""^
  29                      (
  30                          (?:https?://)?                                       # http(s):// (optional)
  31                          (?:youtu\.be/|(?:\w+\.)?youtube(?:-nocookie)?\.com/|
  32                             tube\.majestyc\.net/)                             # the various hostnames, with wildcard subdomains
  33                          (?:.*?\#/)?                                          # handle anchor (#/) redirect urls
  34                          (?:                                                  # the various things that can precede the ID:
  35                              (?:(?:v|embed|e)/)                               # v/ or embed/ or e/
  36                              |(?:                                             # or the v= param in all its forms
  37                                  (?:watch|movie(?:_popup)?(?:\.php)?)?              # preceding watch(_popup|.php) or nothing (like /?v=xxxx)
  38                                  (?:\?|\#!?)                                  # the params delimiter ? or # or #!
  39                                  (?:.*?&)?                                    # any other preceding param (like /?s=tuff&v=xxxx)
  40                                  v=
  41                              )
  42                          )?                                                   # optional -> youtube.com/xxxx is OK
  43                      )?                                                       # all until now is optional -> you can pass the naked ID
  44                      ([0-9A-Za-z_-]+)                                         # here is it! the YouTube video ID
  45                      (?(1).+)?                                                # if we found the ID, everything can follow
  46                      $"""
  47     _LANG_URL = r'https://www.youtube.com/?hl=en&persist_hl=1&gl=US&persist_gl=1&opt_out_ackd=1'
  48     _LOGIN_URL = 'https://accounts.google.com/ServiceLogin'
  49     _AGE_URL = 'http://www.youtube.com/verify_age?next_url=/&gl=US&hl=en'
  50     _NEXT_URL_RE = r'[\?&]next_url=([^&]+)'
  51     _NETRC_MACHINE = 'youtube'
  52     # Listed in order of quality
  53     _available_formats = ['38', '37', '46', '22', '45', '35', '44', '34', '18', '43', '6', '5', '17', '13']
  54     _available_formats_prefer_free = ['38', '46', '37', '45', '22', '44', '35', '43', '34', '18', '6', '5', '17', '13']
  55     _video_extensions = {
  56         '13': '3gp',
  57         '17': 'mp4',
  58         '18': 'mp4',
  59         '22': 'mp4',
  60         '37': 'mp4',
  61         '38': 'mp4',
  62         '43': 'webm',
  63         '44': 'webm',
  64         '45': 'webm',
  65         '46': 'webm',
  66     }
  67     _video_dimensions = {
  68         '5': '240x400',
  69         '6': '???',
  70         '13': '???',
  71         '17': '144x176',
  72         '18': '360x640',
  73         '22': '720x1280',
  74         '34': '360x640',
  75         '35': '480x854',
  76         '37': '1080x1920',
  77         '38': '3072x4096',
  78         '43': '360x640',
  79         '44': '480x854',
  80         '45': '720x1280',
  81         '46': '1080x1920',
  82     }
  83     IE_NAME = u'youtube'
  84     _TESTS = [
  85         {
  86             u"url":  u"http://www.youtube.com/watch?v=BaW_jenozKc",
  87             u"file":  u"BaW_jenozKc.mp4",
  88             u"info_dict": {
  89                 u"title": u"youtube-dl test video \"'/\\ä↭𝕐",
  90                 u"uploader": u"Philipp Hagemeister",
  91                 u"uploader_id": u"phihag",
  92                 u"upload_date": u"20121002",
  93                 u"description": u"test chars:  \"'/\\ä↭𝕐\n\nThis is a test video for youtube-dl.\n\nFor more information, contact phihag@phihag.de ."
  94             }
  95         },
  96         {
  97             u"url":  u"http://www.youtube.com/watch?v=1ltcDfZMA3U",
  98             u"file":  u"1ltcDfZMA3U.flv",
  99             u"note": u"Test VEVO video (#897)",
 100             u"info_dict": {
 101                 u"upload_date": u"20070518",
 102                 u"title": u"Maps - It Will Find You",
 103                 u"description": u"Music video by Maps performing It Will Find You.",
 104                 u"uploader": u"MuteUSA",
 105                 u"uploader_id": u"MuteUSA"
 106             }
 107         },
 108         {
 109             u"url":  u"http://www.youtube.com/watch?v=UxxajLWwzqY",
 110             u"file":  u"UxxajLWwzqY.mp4",
 111             u"note": u"Test generic use_cipher_signature video (#897)",
 112             u"info_dict": {
 113                 u"upload_date": u"20120506",
 114                 u"title": u"Icona Pop - I Love It (feat. Charli XCX) [OFFICIAL VIDEO]",
 115                 u"description": u"md5:b085c9804f5ab69f4adea963a2dceb3c",
 116                 u"uploader": u"IconaPop",
 117                 u"uploader_id": u"IconaPop"
 118             }
 119         }
 120     ]
 121
 122
 123     @classmethod
 124     def suitable(cls, url):
 125         """Receives a URL and returns True if suitable for this IE."""
 126         if YoutubePlaylistIE.suitable(url): return False
 127         return re.match(cls._VALID_URL, url, re.VERBOSE) is not None
 128
 129     def report_lang(self):
 130         """Report attempt to set language."""
 131         self.to_screen(u'Setting language')
 132
 133     def report_login(self):
 134         """Report attempt to log in."""
 135         self.to_screen(u'Logging in')
 136
 137     def report_video_webpage_download(self, video_id):
 138         """Report attempt to download video webpage."""
 139         self.to_screen(u'%s: Downloading video webpage' % video_id)
 140
 141     def report_video_info_webpage_download(self, video_id):
 142         """Report attempt to download video info webpage."""
 143         self.to_screen(u'%s: Downloading video info webpage' % video_id)
 144
 145     def report_video_subtitles_download(self, video_id):
 146         """Report attempt to download video info webpage."""
 147         self.to_screen(u'%s: Checking available subtitles' % video_id)
 148
 149     def report_video_subtitles_request(self, video_id, sub_lang, format):
 150         """Report attempt to download video info webpage."""
 151         self.to_screen(u'%s: Downloading video subtitles for %s.%s' % (video_id, sub_lang, format))
 152
 153     def report_video_subtitles_available(self, video_id, sub_lang_list):
 154         """Report available subtitles."""
 155         sub_lang = ",".join(list(sub_lang_list.keys()))
 156         self.to_screen(u'%s: Available subtitles for video: %s' % (video_id, sub_lang))
 157
 158     def report_information_extraction(self, video_id):
 159         """Report attempt to extract video information."""
 160         self.to_screen(u'%s: Extracting video information' % video_id)
 161
 162     def report_unavailable_format(self, video_id, format):
 163         """Report extracted video URL."""
 164         self.to_screen(u'%s: Format %s not available' % (video_id, format))
 165
 166     def report_rtmp_download(self):
 167         """Indicate the download will use the RTMP protocol."""
 168         self.to_screen(u'RTMP download detected')
 169
 170     def _decrypt_signature(self, s):
 171         """Turn the encrypted s field into a working signature"""
 172
 173         if len(s) == 88:
 174             return s[48] + s[81:67:-1] + s[82] + s[66:62:-1] + s[85] + s[61:48:-1] + s[67] + s[47:12:-1] + s[3] + s[11:3:-1] + s[2] + s[12]
 175         elif len(s) == 87:
 176             return s[62] + s[82:62:-1] + s[83] + s[61:52:-1] + s[0] + s[51:2:-1]
 177         elif len(s) == 86:
 178             return s[2:63] + s[82] + s[64:82] + s[63]
 179         elif len(s) == 85:
 180             return s[76] + s[82:76:-1] + s[83] + s[75:60:-1] + s[0] + s[59:50:-1] + s[1] + s[49:2:-1]
 181         elif len(s) == 84:
 182             return s[83:36:-1] + s[2] + s[35:26:-1] + s[3] + s[25:3:-1] + s[26]
 183         elif len(s) == 83:
 184             return s[52] + s[81:55:-1] + s[2] + s[54:52:-1] + s[82] + s[51:36:-1] + s[55] + s[35:2:-1] + s[36]
 185         elif len(s) == 82:
 186             return s[36] + s[79:67:-1] + s[81] + s[66:40:-1] + s[33] + s[39:36:-1] + s[40] + s[35] + s[0] + s[67] + s[32:0:-1] + s[34]
 187
 188         else:
 189             raise ExtractorError(u'Unable to decrypt signature, key length %d not supported; retrying might work' % (len(s)))
 190
 191     def _get_available_subtitles(self, video_id):
 192         self.report_video_subtitles_download(video_id)
 193         request = compat_urllib_request.Request('http://video.google.com/timedtext?hl=en&type=list&v=%s' % video_id)
 194         try:
 195             sub_list = compat_urllib_request.urlopen(request).read().decode('utf-8')
 196         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 197             return (u'unable to download video subtitles: %s' % compat_str(err), None)
 198         sub_lang_list = re.findall(r'name="([^"]*)"[^>]+lang_code="([\w\-]+)"', sub_list)
 199         sub_lang_list = dict((l[1], l[0]) for l in sub_lang_list)
 200         if not sub_lang_list:
 201             return (u'video doesn\'t have subtitles', None)
 202         return sub_lang_list
 203
 204     def _list_available_subtitles(self, video_id):
 205         sub_lang_list = self._get_available_subtitles(video_id)
 206         self.report_video_subtitles_available(video_id, sub_lang_list)
 207
 208     def _request_subtitle(self, sub_lang, sub_name, video_id, format):
 209         """
 210         Return tuple:
 211         (error_message, sub_lang, sub)
 212         """
 213         self.report_video_subtitles_request(video_id, sub_lang, format)
 214         params = compat_urllib_parse.urlencode({
 215             'lang': sub_lang,
 216             'name': sub_name,
 217             'v': video_id,
 218             'fmt': format,
 219         })
 220         url = 'http://www.youtube.com/api/timedtext?' + params
 221         try:
 222             sub = compat_urllib_request.urlopen(url).read().decode('utf-8')
 223         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 224             return (u'unable to download video subtitles: %s' % compat_str(err), None, None)
 225         if not sub:
 226             return (u'Did not fetch video subtitles', None, None)
 227         return (None, sub_lang, sub)
 228
 229     def _request_automatic_caption(self, video_id, webpage):
 230         """We need the webpage for getting the captions url, pass it as an
 231            argument to speed up the process."""
 232         sub_lang = self._downloader.params.get('subtitleslang') or 'en'
 233         sub_format = self._downloader.params.get('subtitlesformat')
 234         self.to_screen(u'%s: Looking for automatic captions' % video_id)
 235         mobj = re.search(r';ytplayer.config = ({.*?});', webpage)
 236         err_msg = u'Couldn\'t find automatic captions for "%s"' % sub_lang
 237         if mobj is None:
 238             return [(err_msg, None, None)]
 239         player_config = json.loads(mobj.group(1))
 240         try:
 241             args = player_config[u'args']
 242             caption_url = args[u'ttsurl']
 243             timestamp = args[u'timestamp']
 244             params = compat_urllib_parse.urlencode({
 245                 'lang': 'en',
 246                 'tlang': sub_lang,
 247                 'fmt': sub_format,
 248                 'ts': timestamp,
 249                 'kind': 'asr',
 250             })
 251             subtitles_url = caption_url + '&' + params
 252             sub = self._download_webpage(subtitles_url, video_id, u'Downloading automatic captions')
 253             return [(None, sub_lang, sub)]
 254         except KeyError:
 255             return [(err_msg, None, None)]
 256
 257     def _extract_subtitle(self, video_id):
 258         """
 259         Return a list with a tuple:
 260         [(error_message, sub_lang, sub)]
 261         """
 262         sub_lang_list = self._get_available_subtitles(video_id)
 263         sub_format = self._downloader.params.get('subtitlesformat')
 264         if  isinstance(sub_lang_list,tuple): #There was some error, it didn't get the available subtitles
 265             return [(sub_lang_list[0], None, None)]
 266         if self._downloader.params.get('subtitleslang', False):
 267             sub_lang = self._downloader.params.get('subtitleslang')
 268         elif 'en' in sub_lang_list:
 269             sub_lang = 'en'
 270         else:
 271             sub_lang = list(sub_lang_list.keys())[0]
 272         if not sub_lang in sub_lang_list:
 273             return [(u'no closed captions found in the specified language "%s"' % sub_lang, None, None)]
 274
 275         subtitle = self._request_subtitle(sub_lang, sub_lang_list[sub_lang].encode('utf-8'), video_id, sub_format)
 276         return [subtitle]
 277
 278     def _extract_all_subtitles(self, video_id):
 279         sub_lang_list = self._get_available_subtitles(video_id)
 280         sub_format = self._downloader.params.get('subtitlesformat')
 281         if  isinstance(sub_lang_list,tuple): #There was some error, it didn't get the available subtitles
 282             return [(sub_lang_list[0], None, None)]
 283         subtitles = []
 284         for sub_lang in sub_lang_list:
 285             subtitle = self._request_subtitle(sub_lang, sub_lang_list[sub_lang].encode('utf-8'), video_id, sub_format)
 286             subtitles.append(subtitle)
 287         return subtitles
 288
 289     def _print_formats(self, formats):
 290         print('Available formats:')
 291         for x in formats:
 292             print('%s\t:\t%s\t[%s]' %(x, self._video_extensions.get(x, 'flv'), self._video_dimensions.get(x, '???')))
 293
 294     def _real_initialize(self):
 295         if self._downloader is None:
 296             return
 297
 298         username = None
 299         password = None
 300         downloader_params = self._downloader.params
 301
 302         # Attempt to use provided username and password or .netrc data
 303         if downloader_params.get('username', None) is not None:
 304             username = downloader_params['username']
 305             password = downloader_params['password']
 306         elif downloader_params.get('usenetrc', False):
 307             try:
 308                 info = netrc.netrc().authenticators(self._NETRC_MACHINE)
 309                 if info is not None:
 310                     username = info[0]
 311                     password = info[2]
 312                 else:
 313                     raise netrc.NetrcParseError('No authenticators for %s' % self._NETRC_MACHINE)
 314             except (IOError, netrc.NetrcParseError) as err:
 315                 self._downloader.report_warning(u'parsing .netrc: %s' % compat_str(err))
 316                 return
 317
 318         # Set language
 319         request = compat_urllib_request.Request(self._LANG_URL)
 320         try:
 321             self.report_lang()
 322             compat_urllib_request.urlopen(request).read()
 323         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 324             self._downloader.report_warning(u'unable to set language: %s' % compat_str(err))
 325             return
 326
 327         # No authentication to be performed
 328         if username is None:
 329             return
 330
 331         request = compat_urllib_request.Request(self._LOGIN_URL)
 332         try:
 333             login_page = compat_urllib_request.urlopen(request).read().decode('utf-8')
 334         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 335             self._downloader.report_warning(u'unable to fetch login page: %s' % compat_str(err))
 336             return
 337
 338         galx = None
 339         dsh = None
 340         match = re.search(re.compile(r'<input.+?name="GALX".+?value="(.+?)"', re.DOTALL), login_page)
 341         if match:
 342           galx = match.group(1)
 343
 344         match = re.search(re.compile(r'<input.+?name="dsh".+?value="(.+?)"', re.DOTALL), login_page)
 345         if match:
 346           dsh = match.group(1)
 347
 348         # Log in
 349         login_form_strs = {
 350                 u'continue': u'https://www.youtube.com/signin?action_handle_signin=true&feature=sign_in_button&hl=en_US&nomobiletemp=1',
 351                 u'Email': username,
 352                 u'GALX': galx,
 353                 u'Passwd': password,
 354                 u'PersistentCookie': u'yes',
 355                 u'_utf8': u'霱',
 356                 u'bgresponse': u'js_disabled',
 357                 u'checkConnection': u'',
 358                 u'checkedDomains': u'youtube',
 359                 u'dnConn': u'',
 360                 u'dsh': dsh,
 361                 u'pstMsg': u'0',
 362                 u'rmShown': u'1',
 363                 u'secTok': u'',
 364                 u'signIn': u'Sign in',
 365                 u'timeStmp': u'',
 366                 u'service': u'youtube',
 367                 u'uilel': u'3',
 368                 u'hl': u'en_US',
 369         }
 370         # Convert to UTF-8 *before* urlencode because Python 2.x's urlencode
 371         # chokes on unicode
 372         login_form = dict((k.encode('utf-8'), v.encode('utf-8')) for k,v in login_form_strs.items())
 373         login_data = compat_urllib_parse.urlencode(login_form).encode('ascii')
 374         request = compat_urllib_request.Request(self._LOGIN_URL, login_data)
 375         try:
 376             self.report_login()
 377             login_results = compat_urllib_request.urlopen(request).read().decode('utf-8')
 378             if re.search(r'(?i)<form[^>]* id="gaia_loginform"', login_results) is not None:
 379                 self._downloader.report_warning(u'unable to log in: bad username or password')
 380                 return
 381         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 382             self._downloader.report_warning(u'unable to log in: %s' % compat_str(err))
 383             return
 384
 385         # Confirm age
 386         age_form = {
 387                 'next_url':     '/',
 388                 'action_confirm':   'Confirm',
 389                 }
 390         request = compat_urllib_request.Request(self._AGE_URL, compat_urllib_parse.urlencode(age_form))
 391         try:
 392             self.report_age_confirmation()
 393             compat_urllib_request.urlopen(request).read().decode('utf-8')
 394         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 395             raise ExtractorError(u'Unable to confirm age: %s' % compat_str(err))
 396
 397     def _extract_id(self, url):
 398         mobj = re.match(self._VALID_URL, url, re.VERBOSE)
 399         if mobj is None:
 400             raise ExtractorError(u'Invalid URL: %s' % url)
 401         video_id = mobj.group(2)
 402         return video_id
 403
 404     def _real_extract(self, url):
 405         if re.match(r'(?:https?://)?[^/]+/watch\?feature=[a-z_]+$', url):
 406             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  ).')
 407
 408         # Extract original video URL from URL with redirection, like age verification, using next_url parameter
 409         mobj = re.search(self._NEXT_URL_RE, url)
 410         if mobj:
 411             url = 'https://www.youtube.com/' + compat_urllib_parse.unquote(mobj.group(1)).lstrip('/')
 412         video_id = self._extract_id(url)
 413
 414         # Get video webpage
 415         self.report_video_webpage_download(video_id)
 416         url = 'https://www.youtube.com/watch?v=%s&gl=US&hl=en&has_verified=1' % video_id
 417         request = compat_urllib_request.Request(url)
 418         try:
 419             video_webpage_bytes = compat_urllib_request.urlopen(request).read()
 420         except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 421             raise ExtractorError(u'Unable to download video webpage: %s' % compat_str(err))
 422
 423         video_webpage = video_webpage_bytes.decode('utf-8', 'ignore')
 424
 425         # Attempt to extract SWF player URL
 426         mobj = re.search(r'swfConfig.*?"(http:\\/\\/.*?watch.*?-.*?\.swf)"', video_webpage)
 427         if mobj is not None:
 428             player_url = re.sub(r'\\(.)', r'\1', mobj.group(1))
 429         else:
 430             player_url = None
 431
 432         # Get video info
 433         self.report_video_info_webpage_download(video_id)
 434         for el_type in ['&el=embedded', '&el=detailpage', '&el=vevo', '']:
 435             video_info_url = ('https://www.youtube.com/get_video_info?&video_id=%s%s&ps=default&eurl=&gl=US&hl=en'
 436                     % (video_id, el_type))
 437             video_info_webpage = self._download_webpage(video_info_url, video_id,
 438                                     note=False,
 439                                     errnote='unable to download video info webpage')
 440             video_info = compat_parse_qs(video_info_webpage)
 441             if 'token' in video_info:
 442                 break
 443         if 'token' not in video_info:
 444             if 'reason' in video_info:
 445                 raise ExtractorError(u'YouTube said: %s' % video_info['reason'][0])
 446             else:
 447                 raise ExtractorError(u'"token" parameter not in video info for unknown reason')
 448
 449         # Check for "rental" videos
 450         if 'ypc_video_rental_bar_text' in video_info and 'author' not in video_info:
 451             raise ExtractorError(u'"rental" videos not supported')
 452
 453         # Start extracting information
 454         self.report_information_extraction(video_id)
 455
 456         # uploader
 457         if 'author' not in video_info:
 458             raise ExtractorError(u'Unable to extract uploader name')
 459         video_uploader = compat_urllib_parse.unquote_plus(video_info['author'][0])
 460
 461         # uploader_id
 462         video_uploader_id = None
 463         mobj = re.search(r'<link itemprop="url" href="http://www.youtube.com/(?:user|channel)/([^"]+)">', video_webpage)
 464         if mobj is not None:
 465             video_uploader_id = mobj.group(1)
 466         else:
 467             self._downloader.report_warning(u'unable to extract uploader nickname')
 468
 469         # title
 470         if 'title' not in video_info:
 471             raise ExtractorError(u'Unable to extract video title')
 472         video_title = compat_urllib_parse.unquote_plus(video_info['title'][0])
 473
 474         # thumbnail image
 475         if 'thumbnail_url' not in video_info:
 476             self._downloader.report_warning(u'unable to extract video thumbnail')
 477             video_thumbnail = ''
 478         else:   # don't panic if we can't find it
 479             video_thumbnail = compat_urllib_parse.unquote_plus(video_info['thumbnail_url'][0])
 480
 481         # upload date
 482         upload_date = None
 483         mobj = re.search(r'id="eow-date.*?>(.*?)</span>', video_webpage, re.DOTALL)
 484         if mobj is not None:
 485             upload_date = ' '.join(re.sub(r'[/,-]', r' ', mobj.group(1)).split())
 486             upload_date = unified_strdate(upload_date)
 487
 488         # description
 489         video_description = get_element_by_id("eow-description", video_webpage)
 490         if video_description:
 491             video_description = clean_html(video_description)
 492         else:
 493             fd_mobj = re.search(r'<meta name="description" content="([^"]+)"', video_webpage)
 494             if fd_mobj:
 495                 video_description = unescapeHTML(fd_mobj.group(1))
 496             else:
 497                 video_description = u''
 498
 499         # subtitles
 500         video_subtitles = None
 501
 502         if self._downloader.params.get('writesubtitles', False):
 503             video_subtitles = self._extract_subtitle(video_id)
 504             if video_subtitles:
 505                 (sub_error, sub_lang, sub) = video_subtitles[0]
 506                 if sub_error:
 507                     self._downloader.report_warning(sub_error)
 508
 509         if self._downloader.params.get('writeautomaticsub', False):
 510             video_subtitles = self._request_automatic_caption(video_id, video_webpage)
 511             (sub_error, sub_lang, sub) = video_subtitles[0]
 512             if sub_error:
 513                 self._downloader.report_warning(sub_error)
 514
 515         if self._downloader.params.get('allsubtitles', False):
 516             video_subtitles = self._extract_all_subtitles(video_id)
 517             for video_subtitle in video_subtitles:
 518                 (sub_error, sub_lang, sub) = video_subtitle
 519                 if sub_error:
 520                     self._downloader.report_warning(sub_error)
 521
 522         if self._downloader.params.get('listsubtitles', False):
 523             self._list_available_subtitles(video_id)
 524             return
 525
 526         if 'length_seconds' not in video_info:
 527             self._downloader.report_warning(u'unable to extract video duration')
 528             video_duration = ''
 529         else:
 530             video_duration = compat_urllib_parse.unquote_plus(video_info['length_seconds'][0])
 531
 532         # Decide which formats to download
 533         req_format = self._downloader.params.get('format', None)
 534
 535         try:
 536             mobj = re.search(r';ytplayer.config = ({.*?});', video_webpage)
 537             if not mobj:
 538                 raise ValueError('Could not find vevo ID')
 539             info = json.loads(mobj.group(1))
 540             args = info['args']
 541             # Easy way to know if the 's' value is in url_encoded_fmt_stream_map
 542             # this signatures are encrypted
 543             m_s = re.search(r'[&,]s=', args['url_encoded_fmt_stream_map'])
 544             if m_s is not None:
 545                 self.to_screen(u'%s: Encrypted signatures detected.' % video_id)
 546                 video_info['url_encoded_fmt_stream_map'] = [args['url_encoded_fmt_stream_map']]
 547         except ValueError:
 548             pass
 549
 550         if 'conn' in video_info and video_info['conn'][0].startswith('rtmp'):
 551             self.report_rtmp_download()
 552             video_url_list = [(None, video_info['conn'][0])]
 553         elif 'url_encoded_fmt_stream_map' in video_info and len(video_info['url_encoded_fmt_stream_map']) >= 1:
 554             url_map = {}
 555             for url_data_str in video_info['url_encoded_fmt_stream_map'][0].split(','):
 556                 url_data = compat_parse_qs(url_data_str)
 557                 if 'itag' in url_data and 'url' in url_data:
 558                     url = url_data['url'][0]
 559                     if 'sig' in url_data:
 560                         url += '&signature=' + url_data['sig'][0]
 561                     elif 's' in url_data:
 562                         if self._downloader.params.get('verbose'):
 563                             s = url_data['s'][0]
 564                             player = self._search_regex(r'html5player-(.+?)\.js', video_webpage,
 565                                 'html5 player', fatal=False)
 566                             self.to_screen('encrypted signature length %d (%d.%d), itag %s, html5 player %s' %
 567                                 (len(s), len(s.split('.')[0]), len(s.split('.')[1]), url_data['itag'][0], player))
 568                         signature = self._decrypt_signature(url_data['s'][0])
 569                         url += '&signature=' + signature
 570                     if 'ratebypass' not in url:
 571                         url += '&ratebypass=yes'
 572                     url_map[url_data['itag'][0]] = url
 573
 574             format_limit = self._downloader.params.get('format_limit', None)
 575             available_formats = self._available_formats_prefer_free if self._downloader.params.get('prefer_free_formats', False) else self._available_formats
 576             if format_limit is not None and format_limit in available_formats:
 577                 format_list = available_formats[available_formats.index(format_limit):]
 578             else:
 579                 format_list = available_formats
 580             existing_formats = [x for x in format_list if x in url_map]
 581             if len(existing_formats) == 0:
 582                 raise ExtractorError(u'no known formats available for video')
 583             if self._downloader.params.get('listformats', None):
 584                 self._print_formats(existing_formats)
 585                 return
 586             if req_format is None or req_format == 'best':
 587                 video_url_list = [(existing_formats[0], url_map[existing_formats[0]])] # Best quality
 588             elif req_format == 'worst':
 589                 video_url_list = [(existing_formats[-1], url_map[existing_formats[-1]])] # worst quality
 590             elif req_format in ('-1', 'all'):
 591                 video_url_list = [(f, url_map[f]) for f in existing_formats] # All formats
 592             else:
 593                 # Specific formats. We pick the first in a slash-delimeted sequence.
 594                 # For example, if '1/2/3/4' is requested and '2' and '4' are available, we pick '2'.
 595                 req_formats = req_format.split('/')
 596                 video_url_list = None
 597                 for rf in req_formats:
 598                     if rf in url_map:
 599                         video_url_list = [(rf, url_map[rf])]
 600                         break
 601                 if video_url_list is None:
 602                     raise ExtractorError(u'requested format not available')
 603         else:
 604             raise ExtractorError(u'no conn or url_encoded_fmt_stream_map information found in video info')
 605
 606         results = []
 607         for format_param, video_real_url in video_url_list:
 608             # Extension
 609             video_extension = self._video_extensions.get(format_param, 'flv')
 610
 611             video_format = '{0} - {1}'.format(format_param if format_param else video_extension,
 612                                               self._video_dimensions.get(format_param, '???'))
 613
 614             results.append({
 615                 'id':       video_id,
 616                 'url':      video_real_url,
 617                 'uploader': video_uploader,
 618                 'uploader_id': video_uploader_id,
 619                 'upload_date':  upload_date,
 620                 'title':    video_title,
 621                 'ext':      video_extension,
 622                 'format':   video_format,
 623                 'thumbnail':    video_thumbnail,
 624                 'description':  video_description,
 625                 'player_url':   player_url,
 626                 'subtitles':    video_subtitles,
 627                 'duration':     video_duration
 628             })
 629         return results
 630
 631 class YoutubePlaylistIE(InfoExtractor):
 632     """Information Extractor for YouTube playlists."""
 633
 634     _VALID_URL = r"""(?:
 635                         (?:https?://)?
 636                         (?:\w+\.)?
 637                         youtube\.com/
 638                         (?:
 639                            (?:course|view_play_list|my_playlists|artist|playlist|watch)
 640                            \? (?:.*?&)*? (?:p|a|list)=
 641                         |  p/
 642                         )
 643                         ((?:PL|EC|UU)?[0-9A-Za-z-_]{10,})
 644                         .*
 645                      |
 646                         ((?:PL|EC|UU)[0-9A-Za-z-_]{10,})
 647                      )"""
 648     _TEMPLATE_URL = 'https://gdata.youtube.com/feeds/api/playlists/%s?max-results=%i&start-index=%i&v=2&alt=json&safeSearch=none'
 649     _MAX_RESULTS = 50
 650     IE_NAME = u'youtube:playlist'
 651
 652     @classmethod
 653     def suitable(cls, url):
 654         """Receives a URL and returns True if suitable for this IE."""
 655         return re.match(cls._VALID_URL, url, re.VERBOSE) is not None
 656
 657     def _real_extract(self, url):
 658         # Extract playlist id
 659         mobj = re.match(self._VALID_URL, url, re.VERBOSE)
 660         if mobj is None:
 661             raise ExtractorError(u'Invalid URL: %s' % url)
 662
 663         # Download playlist videos from API
 664         playlist_id = mobj.group(1) or mobj.group(2)
 665         page_num = 1
 666         videos = []
 667
 668         while True:
 669             url = self._TEMPLATE_URL % (playlist_id, self._MAX_RESULTS, self._MAX_RESULTS * (page_num - 1) + 1)
 670             page = self._download_webpage(url, playlist_id, u'Downloading page #%s' % page_num)
 671
 672             try:
 673                 response = json.loads(page)
 674             except ValueError as err:
 675                 raise ExtractorError(u'Invalid JSON in API response: ' + compat_str(err))
 676
 677             if 'feed' not in response:
 678                 raise ExtractorError(u'Got a malformed response from YouTube API')
 679             playlist_title = response['feed']['title']['$t']
 680             if 'entry' not in response['feed']:
 681                 # Number of videos is a multiple of self._MAX_RESULTS
 682                 break
 683
 684             for entry in response['feed']['entry']:
 685                 index = entry['yt$position']['$t']
 686                 if 'media$group' in entry and 'media$player' in entry['media$group']:
 687                     videos.append((index, entry['media$group']['media$player']['url']))
 688
 689             if len(response['feed']['entry']) < self._MAX_RESULTS:
 690                 break
 691             page_num += 1
 692
 693         videos = [v[1] for v in sorted(videos)]
 694
 695         url_results = [self.url_result(url, 'Youtube') for url in videos]
 696         return [self.playlist_result(url_results, playlist_id, playlist_title)]
 697
 698
 699 class YoutubeChannelIE(InfoExtractor):
 700     """Information Extractor for YouTube channels."""
 701
 702     _VALID_URL = r"^(?:https?://)?(?:youtu\.be|(?:\w+\.)?youtube(?:-nocookie)?\.com)/channel/([0-9A-Za-z_-]+)"
 703     _TEMPLATE_URL = 'http://www.youtube.com/channel/%s/videos?sort=da&flow=list&view=0&page=%s&gl=US&hl=en'
 704     _MORE_PAGES_INDICATOR = 'yt-uix-load-more'
 705     _MORE_PAGES_URL = 'http://www.youtube.com/channel_ajax?action_load_more_videos=1&flow=list&paging=%s&view=0&sort=da&channel_id=%s'
 706     IE_NAME = u'youtube:channel'
 707
 708     def extract_videos_from_page(self, page):
 709         ids_in_page = []
 710         for mobj in re.finditer(r'href="/watch\?v=([0-9A-Za-z_-]+)&?', page):
 711             if mobj.group(1) not in ids_in_page:
 712                 ids_in_page.append(mobj.group(1))
 713         return ids_in_page
 714
 715     def _real_extract(self, url):
 716         # Extract channel id
 717         mobj = re.match(self._VALID_URL, url)
 718         if mobj is None:
 719             raise ExtractorError(u'Invalid URL: %s' % url)
 720
 721         # Download channel page
 722         channel_id = mobj.group(1)
 723         video_ids = []
 724         pagenum = 1
 725
 726         url = self._TEMPLATE_URL % (channel_id, pagenum)
 727         page = self._download_webpage(url, channel_id,
 728                                       u'Downloading page #%s' % pagenum)
 729
 730         # Extract video identifiers
 731         ids_in_page = self.extract_videos_from_page(page)
 732         video_ids.extend(ids_in_page)
 733
 734         # Download any subsequent channel pages using the json-based channel_ajax query
 735         if self._MORE_PAGES_INDICATOR in page:
 736             while True:
 737                 pagenum = pagenum + 1
 738
 739                 url = self._MORE_PAGES_URL % (pagenum, channel_id)
 740                 page = self._download_webpage(url, channel_id,
 741                                               u'Downloading page #%s' % pagenum)
 742
 743                 page = json.loads(page)
 744
 745                 ids_in_page = self.extract_videos_from_page(page['content_html'])
 746                 video_ids.extend(ids_in_page)
 747
 748                 if self._MORE_PAGES_INDICATOR  not in page['load_more_widget_html']:
 749                     break
 750
 751         self._downloader.to_screen(u'[youtube] Channel %s: Found %i videos' % (channel_id, len(video_ids)))
 752
 753         urls = ['http://www.youtube.com/watch?v=%s' % id for id in video_ids]
 754         url_entries = [self.url_result(url, 'Youtube') for url in urls]
 755         return [self.playlist_result(url_entries, channel_id)]
 756
 757
 758 class YoutubeUserIE(InfoExtractor):
 759     """Information Extractor for YouTube users."""
 760
 761     _VALID_URL = r'(?:(?:(?:https?://)?(?:\w+\.)?youtube\.com/user/)|ytuser:)([A-Za-z0-9_-]+)'
 762     _TEMPLATE_URL = 'http://gdata.youtube.com/feeds/api/users/%s'
 763     _GDATA_PAGE_SIZE = 50
 764     _GDATA_URL = 'http://gdata.youtube.com/feeds/api/users/%s/uploads?max-results=%d&start-index=%d'
 765     _VIDEO_INDICATOR = r'/watch\?v=(.+?)[\<&]'
 766     IE_NAME = u'youtube:user'
 767
 768     def _real_extract(self, url):
 769         # Extract username
 770         mobj = re.match(self._VALID_URL, url)
 771         if mobj is None:
 772             raise ExtractorError(u'Invalid URL: %s' % url)
 773
 774         username = mobj.group(1)
 775
 776         # Download video ids using YouTube Data API. Result size per
 777         # query is limited (currently to 50 videos) so we need to query
 778         # page by page until there are no video ids - it means we got
 779         # all of them.
 780
 781         video_ids = []
 782         pagenum = 0
 783
 784         while True:
 785             start_index = pagenum * self._GDATA_PAGE_SIZE + 1
 786
 787             gdata_url = self._GDATA_URL % (username, self._GDATA_PAGE_SIZE, start_index)
 788             page = self._download_webpage(gdata_url, username,
 789                                           u'Downloading video ids from %d to %d' % (start_index, start_index + self._GDATA_PAGE_SIZE))
 790
 791             # Extract video identifiers
 792             ids_in_page = []
 793
 794             for mobj in re.finditer(self._VIDEO_INDICATOR, page):
 795                 if mobj.group(1) not in ids_in_page:
 796                     ids_in_page.append(mobj.group(1))
 797
 798             video_ids.extend(ids_in_page)
 799
 800             # A little optimization - if current page is not
 801             # "full", ie. does not contain PAGE_SIZE video ids then
 802             # we can assume that this page is the last one - there
 803             # are no more ids on further pages - no need to query
 804             # again.
 805
 806             if len(ids_in_page) < self._GDATA_PAGE_SIZE:
 807                 break
 808
 809             pagenum += 1
 810
 811         urls = ['http://www.youtube.com/watch?v=%s' % video_id for video_id in video_ids]
 812         url_results = [self.url_result(url, 'Youtube') for url in urls]
 813         return [self.playlist_result(url_results, playlist_title = username)]
 814
 815 class YoutubeSearchIE(SearchInfoExtractor):
 816     """Information Extractor for YouTube search queries."""
 817     _API_URL = 'https://gdata.youtube.com/feeds/api/videos?q=%s&start-index=%i&max-results=50&v=2&alt=jsonc'
 818     _MAX_RESULTS = 1000
 819     IE_NAME = u'youtube:search'
 820     _SEARCH_KEY = 'ytsearch'
 821
 822     def report_download_page(self, query, pagenum):
 823         """Report attempt to download search page with given number."""
 824         self._downloader.to_screen(u'[youtube] query "%s": Downloading page %s' % (query, pagenum))
 825
 826     def _get_n_results(self, query, n):
 827         """Get a specified number of results for a query"""
 828
 829         video_ids = []
 830         pagenum = 0
 831         limit = n
 832
 833         while (50 * pagenum) < limit:
 834             self.report_download_page(query, pagenum+1)
 835             result_url = self._API_URL % (compat_urllib_parse.quote_plus(query), (50*pagenum)+1)
 836             request = compat_urllib_request.Request(result_url)
 837             try:
 838                 data = compat_urllib_request.urlopen(request).read().decode('utf-8')
 839             except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
 840                 raise ExtractorError(u'Unable to download API page: %s' % compat_str(err))
 841             api_response = json.loads(data)['data']
 842
 843             if not 'items' in api_response:
 844                 raise ExtractorError(u'[youtube] No video results')
 845
 846             new_ids = list(video['id'] for video in api_response['items'])
 847             video_ids += new_ids
 848
 849             limit = min(n, api_response['totalItems'])
 850             pagenum += 1
 851
 852         if len(video_ids) > n:
 853             video_ids = video_ids[:n]
 854         videos = [self.url_result('http://www.youtube.com/watch?v=%s' % id, 'Youtube') for id in video_ids]
 855         return self.playlist_result(videos, query)