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[youtubedl] / youtube_dl / extractor / stanfordoc.py
1 import re
2 import socket
3 import xml.etree.ElementTree
4
5 from .common import InfoExtractor
6 from ..utils import (
7 compat_http_client,
8 compat_str,
9 compat_urllib_error,
10 compat_urllib_request,
11
12 ExtractorError,
13 orderedSet,
14 unescapeHTML,
15 )
16
17
18 class StanfordOpenClassroomIE(InfoExtractor):
19 """Information extractor for Stanford's Open ClassRoom"""
20
21 _VALID_URL = r'^(?:https?://)?openclassroom.stanford.edu(?P<path>/?|(/MainFolder/(?:HomePage|CoursePage|VideoPage)\.php([?]course=(?P<course>[^&]+)(&video=(?P<video>[^&]+))?(&.*)?)?))$'
22 IE_NAME = u'stanfordoc'
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 try:
42 metaXml = compat_urllib_request.urlopen(xmlUrl).read()
43 except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
44 raise ExtractorError(u'Unable to download video info XML: %s' % compat_str(err))
45 mdoc = xml.etree.ElementTree.fromstring(metaXml)
46 try:
47 info['title'] = mdoc.findall('./title')[0].text
48 info['url'] = baseUrl + mdoc.findall('./videoFile')[0].text
49 except IndexError:
50 raise ExtractorError(u'Invalid metadata XML file')
51 info['ext'] = info['url'].rpartition('.')[2]
52 return [info]
53 elif mobj.group('course'): # A course page
54 course = mobj.group('course')
55 info = {
56 'id': course,
57 'type': 'playlist',
58 'uploader': None,
59 'upload_date': None,
60 }
61
62 coursepage = self._download_webpage(url, info['id'],
63 note='Downloading course info page',
64 errnote='Unable to download course info page')
65
66 info['title'] = self._html_search_regex('<h1>([^<]+)</h1>', coursepage, 'title', default=info['id'])
67
68 info['description'] = self._html_search_regex('<description>([^<]+)</description>',
69 coursepage, u'description', fatal=False)
70
71 links = orderedSet(re.findall('<a href="(VideoPage.php\?[^"]+)">', coursepage))
72 info['list'] = [
73 {
74 'type': 'reference',
75 'url': 'http://openclassroom.stanford.edu/MainFolder/' + unescapeHTML(vpage),
76 }
77 for vpage in links]
78 results = []
79 for entry in info['list']:
80 assert entry['type'] == 'reference'
81 results += self.extract(entry['url'])
82 return results
83 else: # Root page
84 info = {
85 'id': 'Stanford OpenClassroom',
86 'type': 'playlist',
87 'uploader': None,
88 'upload_date': None,
89 }
90
91 self.report_download_webpage(info['id'])
92 rootURL = 'http://openclassroom.stanford.edu/MainFolder/HomePage.php'
93 try:
94 rootpage = compat_urllib_request.urlopen(rootURL).read()
95 except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
96 raise ExtractorError(u'Unable to download course info page: ' + compat_str(err))
97
98 info['title'] = info['id']
99
100 links = orderedSet(re.findall('<a href="(CoursePage.php\?[^"]+)">', rootpage))
101 info['list'] = [
102 {
103 'type': 'reference',
104 'url': 'http://openclassroom.stanford.edu/MainFolder/' + unescapeHTML(cpage),
105 }
106 for cpage in links]
107
108 results = []
109 for entry in info['list']:
110 assert entry['type'] == 'reference'
111 results += self.extract(entry['url'])
112 return results