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[youtubedl] / youtube_dl / extractor / stanfordoc.py
1 import re
2
3 from .common import InfoExtractor
4 from ..utils import (
5 ExtractorError,
6 orderedSet,
7 unescapeHTML,
8 )
9
10
11 class StanfordOpenClassroomIE(InfoExtractor):
12 IE_NAME = u'stanfordoc'
13 IE_DESC = u'Stanford Open ClassRoom'
14 _VALID_URL = r'^(?:https?://)?openclassroom\.stanford\.edu(?P<path>/?|(/MainFolder/(?:HomePage|CoursePage|VideoPage)\.php([?]course=(?P<course>[^&]+)(&video=(?P<video>[^&]+))?(&.*)?)?))$'
15 _TEST = {
16 u'url': u'http://openclassroom.stanford.edu/MainFolder/VideoPage.php?course=PracticalUnix&video=intro-environment&speed=100',
17 u'file': u'PracticalUnix_intro-environment.mp4',
18 u'md5': u'544a9468546059d4e80d76265b0443b8',
19 u'info_dict': {
20 u"title": u"Intro Environment"
21 }
22 }
23
24 def _real_extract(self, url):
25 mobj = re.match(self._VALID_URL, url)
26 if mobj is None:
27 raise ExtractorError(u'Invalid URL: %s' % url)
28
29 if mobj.group('course') and mobj.group('video'): # A specific video
30 course = mobj.group('course')
31 video = mobj.group('video')
32 info = {
33 'id': course + '_' + video,
34 'uploader': None,
35 'upload_date': None,
36 }
37
38 self.report_extraction(info['id'])
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(u'Invalid metadata XML file')
47 info['ext'] = info['url'].rpartition('.')[2]
48 return [info]
49 elif mobj.group('course'): # A course page
50 course = mobj.group('course')
51 info = {
52 'id': course,
53 'type': 'playlist',
54 'uploader': None,
55 'upload_date': None,
56 }
57
58 coursepage = self._download_webpage(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('<h1>([^<]+)</h1>', coursepage, 'title', default=info['id'])
63
64 info['description'] = self._html_search_regex('<description>([^<]+)</description>',
65 coursepage, u'description', fatal=False)
66
67 links = orderedSet(re.findall('<a href="(VideoPage.php\?[^"]+)">', coursepage))
68 info['list'] = [
69 {
70 'type': 'reference',
71 'url': 'http://openclassroom.stanford.edu/MainFolder/' + unescapeHTML(vpage),
72 }
73 for vpage in links]
74 results = []
75 for entry in info['list']:
76 assert entry['type'] == 'reference'
77 results += self.extract(entry['url'])
78 return results
79 else: # Root page
80 info = {
81 'id': 'Stanford OpenClassroom',
82 'type': 'playlist',
83 'uploader': None,
84 'upload_date': None,
85 }
86
87 rootURL = 'http://openclassroom.stanford.edu/MainFolder/HomePage.php'
88 rootpage = self._download_webpage(rootURL, info['id'],
89 errnote=u'Unable to download course info page')
90
91 info['title'] = info['id']
92
93 links = orderedSet(re.findall('<a href="(CoursePage.php\?[^"]+)">', rootpage))
94 info['list'] = [
95 {
96 'type': 'reference',
97 'url': 'http://openclassroom.stanford.edu/MainFolder/' + unescapeHTML(cpage),
98 }
99 for cpage in links]
100
101 results = []
102 for entry in info['list']:
103 assert entry['type'] == 'reference'
104 results += self.extract(entry['url'])
105 return results