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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 IE_NAME = u'stanfordoc'
20 IE_DESC = u'Stanford Open ClassRoom'
21 _VALID_URL = r'^(?:https?://)?openclassroom.stanford.edu(?P<path>/?|(/MainFolder/(?:HomePage|CoursePage|VideoPage)\.php([?]course=(?P<course>[^&]+)(&video=(?P<video>[^&]+))?(&.*)?)?))$'
22 _TEST = {
23 u'url': u'http://openclassroom.stanford.edu/MainFolder/VideoPage.php?course=PracticalUnix&video=intro-environment&speed=100',
24 u'file': u'PracticalUnix_intro-environment.mp4',
25 u'md5': u'544a9468546059d4e80d76265b0443b8',
26 u'info_dict': {
27 u"title": u"Intro Environment"
28 }
29 }
30
31 def _real_extract(self, url):
32 mobj = re.match(self._VALID_URL, url)
33 if mobj is None:
34 raise ExtractorError(u'Invalid URL: %s' % url)
35
36 if mobj.group('course') and mobj.group('video'): # A specific video
37 course = mobj.group('course')
38 video = mobj.group('video')
39 info = {
40 'id': course + '_' + video,
41 'uploader': None,
42 'upload_date': None,
43 }
44
45 self.report_extraction(info['id'])
46 baseUrl = 'http://openclassroom.stanford.edu/MainFolder/courses/' + course + '/videos/'
47 xmlUrl = baseUrl + video + '.xml'
48 try:
49 metaXml = compat_urllib_request.urlopen(xmlUrl).read()
50 except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
51 raise ExtractorError(u'Unable to download video info XML: %s' % compat_str(err))
52 mdoc = xml.etree.ElementTree.fromstring(metaXml)
53 try:
54 info['title'] = mdoc.findall('./title')[0].text
55 info['url'] = baseUrl + mdoc.findall('./videoFile')[0].text
56 except IndexError:
57 raise ExtractorError(u'Invalid metadata XML file')
58 info['ext'] = info['url'].rpartition('.')[2]
59 return [info]
60 elif mobj.group('course'): # A course page
61 course = mobj.group('course')
62 info = {
63 'id': course,
64 'type': 'playlist',
65 'uploader': None,
66 'upload_date': None,
67 }
68
69 coursepage = self._download_webpage(url, info['id'],
70 note='Downloading course info page',
71 errnote='Unable to download course info page')
72
73 info['title'] = self._html_search_regex('<h1>([^<]+)</h1>', coursepage, 'title', default=info['id'])
74
75 info['description'] = self._html_search_regex('<description>([^<]+)</description>',
76 coursepage, u'description', fatal=False)
77
78 links = orderedSet(re.findall('<a href="(VideoPage.php\?[^"]+)">', coursepage))
79 info['list'] = [
80 {
81 'type': 'reference',
82 'url': 'http://openclassroom.stanford.edu/MainFolder/' + unescapeHTML(vpage),
83 }
84 for vpage in links]
85 results = []
86 for entry in info['list']:
87 assert entry['type'] == 'reference'
88 results += self.extract(entry['url'])
89 return results
90 else: # Root page
91 info = {
92 'id': 'Stanford OpenClassroom',
93 'type': 'playlist',
94 'uploader': None,
95 'upload_date': None,
96 }
97
98 self.report_download_webpage(info['id'])
99 rootURL = 'http://openclassroom.stanford.edu/MainFolder/HomePage.php'
100 try:
101 rootpage = compat_urllib_request.urlopen(rootURL).read()
102 except (compat_urllib_error.URLError, compat_http_client.HTTPException, socket.error) as err:
103 raise ExtractorError(u'Unable to download course info page: ' + compat_str(err))
104
105 info['title'] = info['id']
106
107 links = orderedSet(re.findall('<a href="(CoursePage.php\?[^"]+)">', rootpage))
108 info['list'] = [
109 {
110 'type': 'reference',
111 'url': 'http://openclassroom.stanford.edu/MainFolder/' + unescapeHTML(cpage),
112 }
113 for cpage in links]
114
115 results = []
116 for entry in info['list']:
117 assert entry['type'] == 'reference'
118 results += self.extract(entry['url'])
119 return results