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[youtubedl] / youtube_dl / extractor / stanfordoc.py
1 from __future__ import unicode_literals
2
3 import re
4
5 from .common import InfoExtractor
6 from ..utils import (
7 ExtractorError,
8 orderedSet,
9 unescapeHTML,
10 )
11
12
13 class StanfordOpenClassroomIE(InfoExtractor):
14 IE_NAME = 'stanfordoc'
15 IE_DESC = 'Stanford Open ClassRoom'
16 _VALID_URL = r'https?://openclassroom\.stanford\.edu(?P<path>/?|(/MainFolder/(?:HomePage|CoursePage|VideoPage)\.php([?]course=(?P<course>[^&]+)(&video=(?P<video>[^&]+))?(&.*)?)?))$'
17 _TEST = {
18 'url': 'http://openclassroom.stanford.edu/MainFolder/VideoPage.php?course=PracticalUnix&video=intro-environment&speed=100',
19 'md5': '544a9468546059d4e80d76265b0443b8',
20 'info_dict': {
21 'id': 'PracticalUnix_intro-environment',
22 'ext': 'mp4',
23 'title': 'Intro Environment',
24 }
25 }
26
27 def _real_extract(self, url):
28 mobj = re.match(self._VALID_URL, url)
29
30 if mobj.group('course') and mobj.group('video'): # A specific video
31 course = mobj.group('course')
32 video = mobj.group('video')
33 info = {
34 'id': course + '_' + video,
35 'uploader': None,
36 'upload_date': None,
37 }
38
39 baseUrl = 'http://openclassroom.stanford.edu/MainFolder/courses/' + course + '/videos/'
40 xmlUrl = baseUrl + video + '.xml'
41 mdoc = self._download_xml(xmlUrl, info['id'])
42 try:
43 info['title'] = mdoc.findall('./title')[0].text
44 info['url'] = baseUrl + mdoc.findall('./videoFile')[0].text
45 except IndexError:
46 raise ExtractorError('Invalid metadata XML file')
47 return info
48 elif mobj.group('course'): # A course page
49 course = mobj.group('course')
50 info = {
51 'id': course,
52 '_type': 'playlist',
53 'uploader': None,
54 'upload_date': None,
55 }
56
57 coursepage = self._download_webpage(
58 url, info['id'],
59 note='Downloading course info page',
60 errnote='Unable to download course info page')
61
62 info['title'] = self._html_search_regex(
63 r'<h1>([^<]+)</h1>', coursepage, 'title', default=info['id'])
64
65 info['description'] = self._html_search_regex(
66 r'(?s)<description>([^<]+)</description>',
67 coursepage, 'description', fatal=False)
68
69 links = orderedSet(re.findall(r'<a href="(VideoPage\.php\?[^"]+)">', coursepage))
70 info['entries'] = [self.url_result(
71 'http://openclassroom.stanford.edu/MainFolder/%s' % unescapeHTML(l)
72 ) for l in links]
73 return info
74 else: # Root page
75 info = {
76 'id': 'Stanford OpenClassroom',
77 '_type': 'playlist',
78 'uploader': None,
79 'upload_date': None,
80 }
81 info['title'] = info['id']
82
83 rootURL = 'http://openclassroom.stanford.edu/MainFolder/HomePage.php'
84 rootpage = self._download_webpage(rootURL, info['id'],
85 errnote='Unable to download course info page')
86
87 links = orderedSet(re.findall(r'<a href="(CoursePage\.php\?[^"]+)">', rootpage))
88 info['entries'] = [self.url_result(
89 'http://openclassroom.stanford.edu/MainFolder/%s' % unescapeHTML(l)
90 ) for l in links]
91 return info