text: from __future__ import unicode_literals
  
  import re
  
  from .common import InfoExtractor
  from ..compat import compat_urllib_parse
  from ..utils import (
      remove_end,
      HEADRequest,
      sanitized_Request,
  )
  
  
  class GDCVaultIE(InfoExtractor):
      _VALID_URL = r'https?://(?:www\.)?gdcvault\.com/play/(?P<id>\d+)/(?P<name>(\w|-)+)?'
      _NETRC_MACHINE = 'gdcvault'
      _TESTS = [
          {
              'url': 'http://www.gdcvault.com/play/1019721/Doki-Doki-Universe-Sweet-Simple',
              'md5': '7ce8388f544c88b7ac11c7ab1b593704',
              'info_dict': {
                  'id': '1019721',
                  'display_id': 'Doki-Doki-Universe-Sweet-Simple',
                  'ext': 'mp4',
                  'title': 'Doki-Doki Universe: Sweet, Simple and Genuine (GDC Next 10)'
              }
          },
          {
              'url': 'http://www.gdcvault.com/play/1015683/Embracing-the-Dark-Art-of',
              'info_dict': {
                  'id': '1015683',
                  'display_id': 'Embracing-the-Dark-Art-of',
                  'ext': 'flv',
                  'title': 'Embracing the Dark Art of Mathematical Modeling in AI'
              },
              'params': {
                  'skip_download': True,  # Requires rtmpdump
              }
          },
          {
              'url': 'http://www.gdcvault.com/play/1015301/Thexder-Meets-Windows-95-or',
              'md5': 'a5eb77996ef82118afbbe8e48731b98e',
              'info_dict': {
                  'id': '1015301',
                  'display_id': 'Thexder-Meets-Windows-95-or',
                  'ext': 'flv',
                  'title': 'Thexder Meets Windows 95, or Writing Great Games in the Windows 95 Environment',
              },
              'skip': 'Requires login',
          },
          {
              'url': 'http://gdcvault.com/play/1020791/',
              'only_matching': True,
          }
      ]
  
      def _parse_mp4(self, xml_description):
          video_formats = []
          mp4_video = xml_description.find('./metadata/mp4video')
          if mp4_video is None:
              return None
  
          mobj = re.match(r'(?P<root>https?://.*?/).*', mp4_video.text)
          video_root = mobj.group('root')
          formats = xml_description.findall('./metadata/MBRVideos/MBRVideo')
          for format in formats:
              mobj = re.match(r'mp4\:(?P<path>.*)', format.find('streamName').text)
              url = video_root + mobj.group('path')
              vbr = format.find('bitrate').text
              video_formats.append({
                  'url': url,
                  'vbr': int(vbr),
              })
          return video_formats
  
      def _parse_flv(self, xml_description):
          formats = []
          akamai_url = xml_description.find('./metadata/akamaiHost').text
          audios = xml_description.find('./metadata/audios')
          if audios is not None:
              for audio in audios:
                  formats.append({
                      'url': 'rtmp://%s/ondemand?ovpfv=1.1' % akamai_url,
                      'play_path': remove_end(audio.get('url'), '.flv'),
                      'ext': 'flv',
                      'vcodec': 'none',
                      'format_id': audio.get('code'),
                  })
          slide_video_path = xml_description.find('./metadata/slideVideo').text
          formats.append({
              'url': 'rtmp://%s/ondemand?ovpfv=1.1' % akamai_url,
              'play_path': remove_end(slide_video_path, '.flv'),
              'ext': 'flv',
              'format_note': 'slide deck video',
              'quality': -2,
              'preference': -2,
              'format_id': 'slides',
          })
          speaker_video_path = xml_description.find('./metadata/speakerVideo').text
          formats.append({
              'url': 'rtmp://%s/ondemand?ovpfv=1.1' % akamai_url,
              'play_path': remove_end(speaker_video_path, '.flv'),
              'ext': 'flv',
              'format_note': 'speaker video',
              'quality': -1,
              'preference': -1,
              'format_id': 'speaker',
          })
          return formats
  
      def _login(self, webpage_url, display_id):
          (username, password) = self._get_login_info()
          if username is None or password is None:
              self.report_warning('It looks like ' + webpage_url + ' requires a login. Try specifying a username and password and try again.')
              return None
  
          mobj = re.match(r'(?P<root_url>https?://.*?/).*', webpage_url)
          login_url = mobj.group('root_url') + 'api/login.php'
          logout_url = mobj.group('root_url') + 'logout'
  
          login_form = {
              'email': username,
              'password': password,
          }
  
          request = sanitized_Request(login_url, compat_urllib_parse.urlencode(login_form))
          request.add_header('Content-Type', 'application/x-www-form-urlencoded')
          self._download_webpage(request, display_id, 'Logging in')
          start_page = self._download_webpage(webpage_url, display_id, 'Getting authenticated video page')
          self._download_webpage(logout_url, display_id, 'Logging out')
  
          return start_page
  
      def _real_extract(self, url):
          mobj = re.match(self._VALID_URL, url)
  
          video_id = mobj.group('id')
          display_id = mobj.group('name') or video_id
  
          webpage_url = 'http://www.gdcvault.com/play/' + video_id
          start_page = self._download_webpage(webpage_url, display_id)
  
          direct_url = self._search_regex(
              r's1\.addVariable\("file",\s*encodeURIComponent\("(/[^"]+)"\)\);',
              start_page, 'url', default=None)
          if direct_url:
              title = self._html_search_regex(
                  r'<td><strong>Session Name</strong></td>\s*<td>(.*?)</td>',
                  start_page, 'title')
              video_url = 'http://www.gdcvault.com' + direct_url
              # resolve the url so that we can detect the correct extension
              head = self._request_webpage(HEADRequest(video_url), video_id)
              video_url = head.geturl()
  
              return {
                  'id': video_id,
                  'display_id': display_id,
                  'url': video_url,
                  'title': title,
              }
  
          xml_root = self._html_search_regex(
              r'<iframe src="(?P<xml_root>.*?)player.html.*?".*?</iframe>',
              start_page, 'xml root', default=None)
          if xml_root is None:
              # Probably need to authenticate
              login_res = self._login(webpage_url, display_id)
              if login_res is None:
                  self.report_warning('Could not login.')
              else:
                  start_page = login_res
                  # Grab the url from the authenticated page
                  xml_root = self._html_search_regex(
                      r'<iframe src="(.*?)player.html.*?".*?</iframe>',
                      start_page, 'xml root')
  
          xml_name = self._html_search_regex(
              r'<iframe src=".*?\?xml=(.+?\.xml).*?".*?</iframe>',
              start_page, 'xml filename', default=None)
          if xml_name is None:
              # Fallback to the older format
              xml_name = self._html_search_regex(r'<iframe src=".*?\?xmlURL=xml/(?P<xml_file>.+?\.xml).*?".*?</iframe>', start_page, 'xml filename')
  
          xml_description_url = xml_root + 'xml/' + xml_name
          xml_description = self._download_xml(xml_description_url, display_id)
  
          video_title = xml_description.find('./metadata/title').text
          video_formats = self._parse_mp4(xml_description)
          if video_formats is None:
              video_formats = self._parse_flv(xml_description)
  
          return {
              'id': video_id,
              'display_id': display_id,
              'title': video_title,
              'formats': video_formats,
          }
  