Add an extractor for space.com (fixes #1718)

It uses Brightcove, but requires some special process for getting a url with the playerKey field in some videos

youtube_dl/extractor/__init__.py

@@ -115,6 +115,7 @@
 from .sohu import SohuIE
 from .soundcloud import SoundcloudIE, SoundcloudSetIE, SoundcloudUserIE
 from .southparkstudios import SouthParkStudiosIE
+from .space import SpaceIE
 from .spankwire import SpankwireIE
 from .spiegel import SpiegelIE
 from .stanfordoc import StanfordOpenClassroomIE

youtube_dl/extractor/space.py

@@ -0,0 +1,35 @@
+import re
+
+from .common import InfoExtractor
+from .brightcove import BrightcoveIE
+from ..utils import RegexNotFoundError, ExtractorError
+
+
+class SpaceIE(InfoExtractor):
+    _VALID_URL = r'https?://www\.space\.com/\d+-(?P<title>[^/\.\?]*?)-video.html'
+    _TEST = {
+        u'add_ie': ['Brightcove'],
+        u'url': u'http://www.space.com/23373-huge-martian-landforms-detail-revealed-by-european-probe-video.html',
+        u'info_dict': {
+            u'id': u'2780937028001',
+            u'ext': u'mp4',
+            u'title': u'Huge Martian Landforms\' Detail Revealed By European Probe | Video',
+            u'description': u'md5:db81cf7f3122f95ed234b631a6ea1e61',
+            u'uploader': u'TechMedia Networks',
+        },
+    }
+
+    def _real_extract(self, url):
+        mobj = re.match(self._VALID_URL, url)
+        title = mobj.group('title')
+        webpage = self._download_webpage(url, title)
+        try:
+            # Some videos require the playerKey field, which isn't define in
+            # the BrightcoveExperience object
+            brightcove_url = self._og_search_video_url(webpage)
+        except RegexNotFoundError:
+            # Other videos works fine with the info from the object
+            brightcove_url = BrightcoveIE._extract_brightcove_url(webpage)
+        if brightcove_url is None:
+            raise ExtractorError(u'The webpage does not contain a video', expected=True)
+        return self.url_result(brightcove_url, BrightcoveIE.ie_key())