[livestream:original] Add support for folder urls (closes #2631)

The webpage only contains shortened links for the videos, since the server
doesn't support HEAD requests, we use an specific extractor for them.

youtube_dl/extractor/livestream.py

@@ -9,6 +9,7 @@ from ..utils import (
     compat_urlparse,
     xpath_with_ns,
     compat_str,
+    orderedSet,
 )
 
 
@@ -64,7 +65,10 @@ class LivestreamIE(InfoExtractor):
 # The original version of Livestream uses a different system
 class LivestreamOriginalIE(InfoExtractor):
     IE_NAME = 'livestream:original'
-    _VALID_URL = r'https?://www\.livestream\.com/(?P<user>[^/]+)/video\?.*?clipId=(?P<id>.*?)(&|$)'
+    _VALID_URL = r'''(?x)https?://www\.livestream\.com/
+        (?P<user>[^/]+)/(?P<type>video|folder)
+        (?:\?.*?Id=|/)(?P<id>.*?)(&|$)
+        '''
     _TEST = {
         'url': 'http://www.livestream.com/dealbook/video?clipId=pla_8aa4a3f1-ba15-46a4-893b-902210e138fb',
         'info_dict': {
@@ -78,10 +82,7 @@ class LivestreamOriginalIE(InfoExtractor):
         },
     }
 
-    def _real_extract(self, url):
-        mobj = re.match(self._VALID_URL, url)
-        video_id = mobj.group('id')
-        user = mobj.group('user')
+    def _extract_video(self, user, video_id):
         api_url = 'http://x{0}x.api.channel.livestream.com/2.0/clipdetails?extendedInfo=true&id={1}'.format(user, video_id)
 
         info = self._download_xml(api_url, video_id)
@@ -99,3 +100,44 @@ class LivestreamOriginalIE(InfoExtractor):
             'ext': 'flv',
             'thumbnail': thumbnail_url,
         }
+
+    def _extract_folder(self, url, folder_id):
+        webpage = self._download_webpage(url, folder_id)
+        urls = orderedSet(re.findall(r'<a href="(https?://livestre\.am/.*?)"', webpage))
+
+        return {
+            '_type': 'playlist',
+            'id': folder_id,
+            'entries': [{
+                '_type': 'url',
+                'url': video_url,
+            } for video_url in urls],
+        }
+
+    def _real_extract(self, url):
+        mobj = re.match(self._VALID_URL, url)
+        id = mobj.group('id')
+        user = mobj.group('user')
+        url_type = mobj.group('type')
+        if url_type == 'folder':
+            return self._extract_folder(url, id)
+        else:
+            return self._extract_video(user, id)
+
+
+# The server doesn't support HEAD request, the generic extractor can't detect
+# the redirection
+class LivestreamShortenerIE(InfoExtractor):
+    IE_NAME = 'livestream:shortener'
+    IE_DESC = False  # Do not list
+    _VALID_URL = r'https?://livestre\.am/(?P<id>.+)'
+
+    def _real_extract(self, url):
+        mobj = re.match(self._VALID_URL, url)
+        id = mobj.group('id')
+        webpage = self._download_webpage(url, id)
+
+        return {
+            '_type': 'url',
+            'url': self._og_search_url(webpage),
+        }