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[youtubedl] / youtube_dl / extractor / khanacademy.py
1 from __future__ import unicode_literals
2
3 import re
4
5 from .common import InfoExtractor
6 from ..utils import (
7 unified_strdate,
8 )
9
10
11 class KhanAcademyIE(InfoExtractor):
12 _VALID_URL = r'^https?://(?:(?:www|api)\.)?khanacademy\.org/(?P<key>[^/]+)/(?:[^/]+/){,2}(?P<id>[^?#/]+)(?:$|[?#])'
13 IE_NAME = 'KhanAcademy'
14
15 _TESTS = [{
16 'url': 'http://www.khanacademy.org/video/one-time-pad',
17 'md5': '7b391cce85e758fb94f763ddc1bbb979',
18 'info_dict': {
19 'id': 'one-time-pad',
20 'ext': 'webm',
21 'title': 'The one-time pad',
22 'description': 'The perfect cipher',
23 'duration': 176,
24 'uploader': 'Brit Cruise',
25 'uploader_id': 'khanacademy',
26 'upload_date': '20120411',
27 },
28 'add_ie': ['Youtube'],
29 }, {
30 'url': 'https://www.khanacademy.org/math/applied-math/cryptography',
31 'info_dict': {
32 'id': 'cryptography',
33 'title': 'Journey into cryptography',
34 'description': 'How have humans protected their secret messages through history? What has changed today?',
35 },
36 'playlist_mincount': 3,
37 }]
38
39 def _real_extract(self, url):
40 m = re.match(self._VALID_URL, url)
41 video_id = m.group('id')
42
43 if m.group('key') == 'video':
44 data = self._download_json(
45 'http://api.khanacademy.org/api/v1/videos/' + video_id,
46 video_id, 'Downloading video info')
47
48 upload_date = unified_strdate(data['date_added'])
49 uploader = ', '.join(data['author_names'])
50 return {
51 '_type': 'url_transparent',
52 'url': data['url'],
53 'id': video_id,
54 'title': data['title'],
55 'thumbnail': data['image_url'],
56 'duration': data['duration'],
57 'description': data['description'],
58 'uploader': uploader,
59 'upload_date': upload_date,
60 }
61 else:
62 # topic
63 data = self._download_json(
64 'http://api.khanacademy.org/api/v1/topic/' + video_id,
65 video_id, 'Downloading topic info')
66
67 entries = [
68 {
69 '_type': 'url',
70 'url': c['url'],
71 'id': c['id'],
72 'title': c['title'],
73 }
74 for c in data['children'] if c['kind'] in ('Video', 'Topic')]
75
76 return {
77 '_type': 'playlist',
78 'id': video_id,
79 'title': data['title'],
80 'description': data['description'],
81 'entries': entries,
82 }