+ # Helper functions for extracting OpenGraph info
+ @staticmethod
+ def _og_regex(prop):
+ return r'<meta.+?property=[\'"]og:%s[\'"].+?content=(?:"(.+?)"|\'(.+?)\')' % re.escape(prop)
+
+ def _og_search_property(self, prop, html, name=None, **kargs):
+ if name is None:
+ name = 'OpenGraph %s' % prop
+ escaped = self._search_regex(self._og_regex(prop), html, name, flags=re.DOTALL, **kargs)
+ if not escaped is None:
+ return unescapeHTML(escaped)
+ return None
+
+ def _og_search_thumbnail(self, html, **kargs):
+ return self._og_search_property('image', html, u'thumbnail url', fatal=False, **kargs)
+
+ def _og_search_description(self, html, **kargs):
+ return self._og_search_property('description', html, fatal=False, **kargs)
+
+ def _og_search_title(self, html, **kargs):
+ return self._og_search_property('title', html, **kargs)
+
+ def _og_search_video_url(self, html, name='video url', secure=True, **kargs):
+ regexes = [self._og_regex('video')]
+ if secure: regexes.insert(0, self._og_regex('video:secure_url'))
+ return self._html_search_regex(regexes, html, name, **kargs)
+
+ def _rta_search(self, html):
+ # See http://www.rtalabel.org/index.php?content=howtofaq#single
+ if re.search(r'(?ix)<meta\s+name="rating"\s+'
+ r' content="RTA-5042-1996-1400-1577-RTA"',
+ html):
+ return 18
+ return 0
+
+