Raphaël G. Git Repositories - youtubedl/blob - youtube_dl/extractor/rtve.py

   1 # encoding: utf-8
   2 from __future__ import unicode_literals
   3
   4 import re
   5 import base64
   6
   7 from .common import InfoExtractor
   8 from ..utils import (
   9     struct_unpack,
  10 )
  11
  12
  13 class RTVEALaCartaIE(InfoExtractor):
  14     IE_NAME = 'rtve.es:alacarta'
  15     IE_DESC = 'RTVE a la carta'
  16     _VALID_URL = r'http://www\.rtve\.es/alacarta/videos/[^/]+/[^/]+/(?P<id>\d+)'
  17
  18     _TEST = {
  19         'url': 'http://www.rtve.es/alacarta/videos/balonmano/o-swiss-cup-masculina-final-espana-suecia/2491869/',
  20         'md5': '1d49b7e1ca7a7502c56a4bf1b60f1b43',
  21         'info_dict': {
  22             'id': '2491869',
  23             'ext': 'mp4',
  24             'title': 'Balonmano - Swiss Cup masculina. Final: España-Suecia',
  25         },
  26     }
  27
  28     def _decrypt_url(self, png):
  29         encrypted_data = base64.b64decode(png)
  30         text_index = encrypted_data.find(b'tEXt')
  31         text_chunk = encrypted_data[text_index-4:]
  32         length = struct_unpack('!I', text_chunk[:4])[0]
  33         # Use bytearray to get integers when iterating in both python 2.x and 3.x
  34         data = bytearray(text_chunk[8:8+length])
  35         data = [chr(b) for b in data if b != 0]
  36         hash_index = data.index('#')
  37         alphabet_data = data[:hash_index]
  38         url_data = data[hash_index+1:]
  39
  40         alphabet = []
  41         e = 0
  42         d = 0
  43         for l in alphabet_data:
  44             if d == 0:
  45                 alphabet.append(l)
  46                 d = e = (e + 1) % 4
  47             else:
  48                 d -= 1
  49         url = ''
  50         f = 0
  51         e = 3
  52         b = 1
  53         for letter in url_data:
  54             if f == 0:
  55                 l = int(letter)*10
  56                 f = 1
  57             else:
  58                 if e == 0:
  59                     l += int(letter)
  60                     url += alphabet[l]
  61                     e = (b + 3) % 4
  62                     f = 0
  63                     b += 1
  64                 else:
  65                     e -= 1
  66
  67         return url
  68
  69     def _real_extract(self, url):
  70         mobj = re.match(self._VALID_URL, url)
  71         video_id = mobj.group('id')
  72         info = self._download_json(
  73             'http://www.rtve.es/api/videos/%s/config/alacarta_videos.json' % video_id,
  74             video_id)['page']['items'][0]
  75         png_url = 'http://www.rtve.es/ztnr/movil/thumbnail/default/videos/%s.png' % video_id
  76         png = self._download_webpage(png_url, video_id, 'Downloading url information')
  77         video_url = self._decrypt_url(png)
  78
  79         return {
  80             'id': video_id,
  81             'title': info['title'],
  82             'url': video_url,
  83             'thumbnail': info['image'],
  84         }