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from __future__ import unicode_literals
import re
from .common import InfoExtractor
from ..utils import (
ExtractorError,
orderedSet,
unescapeHTML,
)
class StanfordOpenClassroomIE(InfoExtractor):
IE_NAME = 'stanfordoc'
IE_DESC = 'Stanford Open ClassRoom'
_VALID_URL = r'https?://openclassroom\.stanford\.edu(?P<path>/?|(/MainFolder/(?:HomePage|CoursePage|VideoPage)\.php([?]course=(?P<course>[^&]+)(&video=(?P<video>[^&]+))?(&.*)?)?))$'
_TEST = {
'url': 'http://openclassroom.stanford.edu/MainFolder/VideoPage.php?course=PracticalUnix&video=intro-environment&speed=100',
'md5': '544a9468546059d4e80d76265b0443b8',
'info_dict': {
'id': 'PracticalUnix_intro-environment',
'ext': 'mp4',
'title': 'Intro Environment',
}
}
def _real_extract(self, url):
mobj = re.match(self._VALID_URL, 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,
}
baseUrl = 'http://openclassroom.stanford.edu/MainFolder/courses/' + course + '/videos/'
xmlUrl = baseUrl + video + '.xml'
mdoc = self._download_xml(xmlUrl, info['id'])
try:
info['title'] = mdoc.findall('./title')[0].text
info['url'] = baseUrl + mdoc.findall('./videoFile')[0].text
except IndexError:
raise ExtractorError('Invalid metadata XML file')
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(
r'<h1>([^<]+)</h1>', coursepage, 'title', default=info['id'])
info['description'] = self._html_search_regex(
r'(?s)<description>([^<]+)</description>',
coursepage, 'description', fatal=False)
links = orderedSet(re.findall(r'<a href="(VideoPage.php\?[^"]+)">', coursepage))
info['entries'] = [self.url_result(
'http://openclassroom.stanford.edu/MainFolder/%s' % unescapeHTML(l)
) for l in links]
return info
else: # Root page
info = {
'id': 'Stanford OpenClassroom',
'_type': 'playlist',
'uploader': None,
'upload_date': None,
}
info['title'] = info['id']
rootURL = 'http://openclassroom.stanford.edu/MainFolder/HomePage.php'
rootpage = self._download_webpage(rootURL, info['id'],
errnote='Unable to download course info page')
links = orderedSet(re.findall(r'<a href="(CoursePage.php\?[^"]+)">', rootpage))
info['entries'] = [self.url_result(
'http://openclassroom.stanford.edu/MainFolder/%s' % unescapeHTML(l)
) for l in links]
return info
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