#90 [niconico] Extract `channel` and `channel_id` (Closes #77)

Authored by kurumigi

youtube_dlc/extractor/niconico.py

@@ -546,11 +546,29 @@ class NiconicoIE(InfoExtractor):
 
         webpage_url = get_video_info_web('watch_url') or url
 
+        # for channel movie and community movie
+        channel_id = try_get(
+            api_data,
+            (lambda x: x['channel']['globalId'],
+             lambda x: x['community']['globalId']))
+        channel = try_get(
+            api_data,
+            (lambda x: x['channel']['name'],
+             lambda x: x['community']['name']))
+
         # Note: cannot use api_data.get('owner', {}) because owner may be set to "null"
         # in the JSON, which will cause None to be returned instead of {}.
         owner = try_get(api_data, lambda x: x.get('owner'), dict) or {}
-        uploader_id = get_video_info_web(['ch_id', 'user_id']) or owner.get('id')
-        uploader = get_video_info_web(['ch_name', 'user_nickname']) or owner.get('nickname')
+        uploader_id = (
+            get_video_info_web(['ch_id', 'user_id'])
+            or owner.get('id')
+            or channel_id
+        )
+        uploader = (
+            get_video_info_web(['ch_name', 'user_nickname'])
+            or owner.get('nickname')
+            or channel
+        )
 
         return {
             'id': video_id,
@@ -561,6 +579,8 @@ class NiconicoIE(InfoExtractor):
             'uploader': uploader,
             'timestamp': timestamp,
             'uploader_id': uploader_id,
+            'channel': channel,
+            'channel_id': channel_id,
             'view_count': view_count,
             'comment_count': comment_count,
             'duration': duration,