Philipp Hagemeister
11 years ago
2 changed files with 113 additions and 95 deletions
Unified View
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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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