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-rw-r--r--youtube_dl/extractor/khanacademy.py71
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diff --git a/youtube_dl/extractor/khanacademy.py b/youtube_dl/extractor/khanacademy.py
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+from __future__ import unicode_literals
+
+import re
+
+from .common import InfoExtractor
+from ..utils import (
+ unified_strdate,
+)
+
+
+class KhanAcademyIE(InfoExtractor):
+ _VALID_URL = r'^https?://(?:www\.)?khanacademy\.org/(?P<key>[^/]+)/(?:[^/]+/){,2}(?P<id>[^?#/]+)(?:$|[?#])'
+ IE_NAME = 'KhanAcademy'
+
+ _TEST = {
+ 'url': 'http://www.khanacademy.org/video/one-time-pad',
+ 'file': 'one-time-pad.mp4',
+ 'md5': '7021db7f2d47d4fff89b13177cb1e8f4',
+ 'info_dict': {
+ 'title': 'The one-time pad',
+ 'description': 'The perfect cipher',
+ 'duration': 176,
+ 'uploader': 'Brit Cruise',
+ 'upload_date': '20120411',
+ }
+ }
+
+ def _real_extract(self, url):
+ m = re.match(self._VALID_URL, url)
+ video_id = m.group('id')
+
+ if m.group('key') == 'video':
+ data = self._download_json(
+ 'http://api.khanacademy.org/api/v1/videos/' + video_id,
+ video_id, 'Downloading video info')
+
+ upload_date = unified_strdate(data['date_added'])
+ uploader = ', '.join(data['author_names'])
+ return {
+ '_type': 'url_transparent',
+ 'url': data['url'],
+ 'id': video_id,
+ 'title': data['title'],
+ 'thumbnail': data['image_url'],
+ 'duration': data['duration'],
+ 'description': data['description'],
+ 'uploader': uploader,
+ 'upload_date': upload_date,
+ }
+ else:
+ # topic
+ data = self._download_json(
+ 'http://api.khanacademy.org/api/v1/topic/' + video_id,
+ video_id, 'Downloading topic info')
+
+ entries = [
+ {
+ '_type': 'url',
+ 'url': c['url'],
+ 'id': c['id'],
+ 'title': c['title'],
+ }
+ for c in data['children'] if c['kind'] in ('Video', 'Topic')]
+
+ return {
+ '_type': 'playlist',
+ 'id': video_id,
+ 'title': data['title'],
+ 'description': data['description'],
+ 'entries': entries,
+ }