text: from __future__ import unicode_literals
  
  import json
  
  from .common import InfoExtractor
  from ..utils import int_or_none
  
  
  class PornotubeIE(InfoExtractor):
      _VALID_URL = r'https?://(?:\w+\.)?pornotube\.com/(?:[^?#]*?)/video/(?P<id>[0-9]+)'
      _TEST = {
          'url': 'http://www.pornotube.com/orientation/straight/video/4964/title/weird-hot-and-wet-science',
          'md5': '60fc5a4f0d93a97968fc7999d98260c9',
          'info_dict': {
              'id': '4964',
              'ext': 'mp4',
              'upload_date': '20141203',
              'title': 'Weird Hot and Wet Science',
              'description': 'md5:a8304bef7ef06cb4ab476ca6029b01b0',
              'categories': ['Adult Humor', 'Blondes'],
              'uploader': 'Alpha Blue Archives',
              'thumbnail': r're:^https?://.*\.jpg$',
              'timestamp': 1417582800,
              'age_limit': 18,
          }
      }
  
      def _real_extract(self, url):
          video_id = self._match_id(url)
  
          token = self._download_json(
              'https://api.aebn.net/auth/v2/origins/authenticate',
              video_id, note='Downloading token',
              data=json.dumps({'credentials': 'Clip Application'}).encode('utf-8'),
              headers={
                  'Content-Type': 'application/json',
                  'Origin': 'http://www.pornotube.com',
              })['tokenKey']
  
          video_url = self._download_json(
              'https://api.aebn.net/delivery/v1/clips/%s/MP4' % video_id,
              video_id, note='Downloading delivery information',
              headers={'Authorization': token})['mediaUrl']
  
          FIELDS = (
              'title', 'description', 'startSecond', 'endSecond', 'publishDate',
              'studios{name}', 'categories{name}', 'movieId', 'primaryImageNumber'
          )
  
          info = self._download_json(
              'https://api.aebn.net/content/v2/clips/%s?fields=%s'
              % (video_id, ','.join(FIELDS)), video_id,
              note='Downloading metadata',
              headers={'Authorization': token})
  
          if isinstance(info, list):
              info = info[0]
  
          title = info['title']
  
          timestamp = int_or_none(info.get('publishDate'), scale=1000)
          uploader = info.get('studios', [{}])[0].get('name')
          movie_id = info.get('movieId')
          primary_image_number = info.get('primaryImageNumber')
          thumbnail = None
          if movie_id and primary_image_number:
              thumbnail = 'http://pic.aebn.net/dis/t/%s/%s_%08d.jpg' % (
                  movie_id, movie_id, primary_image_number)
          start = int_or_none(info.get('startSecond'))
          end = int_or_none(info.get('endSecond'))
          duration = end - start if start and end else None
          categories = [c['name'] for c in info.get('categories', []) if c.get('name')]
  
          return {
              'id': video_id,
              'url': video_url,
              'title': title,
              'description': info.get('description'),
              'duration': duration,
              'timestamp': timestamp,
              'uploader': uploader,
              'thumbnail': thumbnail,
              'categories': categories,
              'age_limit': 18,
          }
  