1 files changed, 112 insertions, 0 deletions
diff --git a/youtube_dl/extractor/stanfordoc.py b/youtube_dl/extractor/stanfordoc.py
new file mode 100644
index 000000000..8d3e32ab9
--- /dev/null
+++ b/youtube_dl/extractor/stanfordoc.py
@@ -0,0 +1,112 @@
+import re
+import socket
+import xml.etree.ElementTree
+
+from .common import InfoExtractor
+from ..utils import (
+    compat_http_client,
+    compat_str,
+    compat_urllib_error,
+    compat_urllib_request,
+
+    ExtractorError,
+    orderedSet,
+    unescapeHTML,
+)
+
+
+class StanfordOpenClassroomIE(InfoExtractor):
+    """Information extractor for Stanford's Open ClassRoom"""
+
+    _VALID_URL = r'^(?:https?://)?openclassroom.stanford.edu(?P<path>/?|(/MainFolder/(?:HomePage|CoursePage|VideoPage)\.php([?]course=(?P<course>[^&]+)(&video=(?P<video>[^&]+))?(&.*)?)?))$'
+    IE_NAME = u'stanfordoc'
+
+    def _real_extract(self, url):
+        mobj = re.match(self._VALID_URL, url)
+        if mobj is None:
+            raise ExtractorError(u'Invalid URL: %s' % url)
+
+        if mobj.group('course') and mobj.group('video'): # A specific video
+            course = mobj.group('course')
+            video = mobj.group('video')
+            info = {
+                'id': course + '_' + video,
+                'uploader': None,
+                'upload_date': None,
+            }
+
+            self.report_extraction(info['id'])
+            baseUrl = 'http://openclassroom.stanford.edu/MainFolder/courses/' + course + '/videos/'
+            xmlUrl = baseUrl + video + '.xml'
+            try:
+                metaXml = compat_urllib_request.urlopen(xmlUrl).read()
+            except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
+                raise ExtractorError(u'Unable to download video info XML: %s' % compat_str(err))
+            mdoc = xml.etree.ElementTree.fromstring(metaXml)
+            try:
+                info['title'] = mdoc.findall('./title')[0].text
+                info['url'] = baseUrl + mdoc.findall('./videoFile')[0].text
+            except IndexError:
+                raise ExtractorError(u'Invalid metadata XML file')
+            info['ext'] = info['url'].rpartition('.')[2]
+            return [info]
+        elif mobj.group('course'): # A course page
+            course = mobj.group('course')
+            info = {
+                'id': course,
+                'type': 'playlist',
+                'uploader': None,
+                'upload_date': None,
+            }
+
+            coursepage = self._download_webpage(url, info['id'],
+                                        note='Downloading course info page',
+                                        errnote='Unable to download course info page')
+
+            info['title'] = self._html_search_regex('<h1>([^<]+)</h1>', coursepage, 'title', default=info['id'])
+
+            info['description'] = self._html_search_regex('<description>([^<]+)</description>',
+                coursepage, u'description', fatal=False)
+
+            links = orderedSet(re.findall('<a href="(VideoPage.php\?[^"]+)">', coursepage))
+            info['list'] = [
+                {
+                    'type': 'reference',
+                    'url': 'http://openclassroom.stanford.edu/MainFolder/' + unescapeHTML(vpage),
+                }
+                    for vpage in links]
+            results = []
+            for entry in info['list']:
+                assert entry['type'] == 'reference'
+                results += self.extract(entry['url'])
+            return results
+        else: # Root page
+            info = {
+                'id': 'Stanford OpenClassroom',
+                'type': 'playlist',
+                'uploader': None,
+                'upload_date': None,
+            }
+
+            self.report_download_webpage(info['id'])
+            rootURL = 'http://openclassroom.stanford.edu/MainFolder/HomePage.php'
+            try:
+                rootpage = compat_urllib_request.urlopen(rootURL).read()
+            except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
+                raise ExtractorError(u'Unable to download course info page: ' + compat_str(err))
+
+            info['title'] = info['id']
+
+            links = orderedSet(re.findall('<a href="(CoursePage.php\?[^"]+)">', rootpage))
+            info['list'] = [
+                {
+                    'type': 'reference',
+                    'url': 'http://openclassroom.stanford.edu/MainFolder/' + unescapeHTML(cpage),
+                }
+                    for cpage in links]
+
+            results = []
+            for entry in info['list']:
+                assert entry['type'] == 'reference'
+                results += self.extract(entry['url'])
+            return results