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