[khanacademy] Add support (Fixes #2066)

[youtube-dl] / youtube_dl / extractor / khanacademy.py

diff --git a/youtube_dl/extractor/khanacademy.py b/youtube_dl/extractor/khanacademy.py
new file mode 100644 (file)
index 0000000..772bb56
--- /dev/null
+++ b/youtube_dl/extractor/khanacademy.py
@@ -0,0 +1,71 @@
+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,
+            }