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[youtube-dl] / youtube_dl / extractor / pluralsight.py
1 from __future__ import unicode_literals
2
3 import re
4 import json
5 import random
6 import collections
7
8 from .common import InfoExtractor
9 from ..compat import (
10     compat_str,
11     compat_urlparse,
12 )
13 from ..utils import (
14     ExtractorError,
15     int_or_none,
16     parse_duration,
17     qualities,
18     sanitized_Request,
19     urlencode_postdata,
20 )
21
22
23 class PluralsightBaseIE(InfoExtractor):
24     _API_BASE = 'http://app.pluralsight.com'
25
26
27 class PluralsightIE(PluralsightBaseIE):
28     IE_NAME = 'pluralsight'
29     _VALID_URL = r'https?://(?:(?:www|app)\.)?pluralsight\.com/training/player\?'
30     _LOGIN_URL = 'https://app.pluralsight.com/id/'
31
32     _NETRC_MACHINE = 'pluralsight'
33
34     _TESTS = [{
35         'url': 'http://www.pluralsight.com/training/player?author=mike-mckeown&name=hosting-sql-server-windows-azure-iaas-m7-mgmt&mode=live&clip=3&course=hosting-sql-server-windows-azure-iaas',
36         'md5': '4d458cf5cf4c593788672419a8dd4cf8',
37         'info_dict': {
38             'id': 'hosting-sql-server-windows-azure-iaas-m7-mgmt-04',
39             'ext': 'mp4',
40             'title': 'Management of SQL Server - Demo Monitoring',
41             'duration': 338,
42         },
43         'skip': 'Requires pluralsight account credentials',
44     }, {
45         'url': 'https://app.pluralsight.com/training/player?course=angularjs-get-started&author=scott-allen&name=angularjs-get-started-m1-introduction&clip=0&mode=live',
46         'only_matching': True,
47     }, {
48         # available without pluralsight account
49         'url': 'http://app.pluralsight.com/training/player?author=scott-allen&name=angularjs-get-started-m1-introduction&mode=live&clip=0&course=angularjs-get-started',
50         'only_matching': True,
51     }]
52
53     def _real_initialize(self):
54         self._login()
55
56     def _login(self):
57         (username, password) = self._get_login_info()
58         if username is None:
59             return
60
61         login_page = self._download_webpage(
62             self._LOGIN_URL, None, 'Downloading login page')
63
64         login_form = self._hidden_inputs(login_page)
65
66         login_form.update({
67             'Username': username,
68             'Password': password,
69         })
70
71         post_url = self._search_regex(
72             r'<form[^>]+action=(["\'])(?P<url>.+?)\1', login_page,
73             'post url', default=self._LOGIN_URL, group='url')
74
75         if not post_url.startswith('http'):
76             post_url = compat_urlparse.urljoin(self._LOGIN_URL, post_url)
77
78         request = sanitized_Request(
79             post_url, urlencode_postdata(login_form))
80         request.add_header('Content-Type', 'application/x-www-form-urlencoded')
81
82         response = self._download_webpage(
83             request, None, 'Logging in as %s' % username)
84
85         error = self._search_regex(
86             r'<span[^>]+class="field-validation-error"[^>]*>([^<]+)</span>',
87             response, 'error message', default=None)
88         if error:
89             raise ExtractorError('Unable to login: %s' % error, expected=True)
90
91         if all(p not in response for p in ('__INITIAL_STATE__', '"currentUser"')):
92             raise ExtractorError('Unable to log in')
93
94     def _real_extract(self, url):
95         qs = compat_urlparse.parse_qs(compat_urlparse.urlparse(url).query)
96
97         author = qs.get('author', [None])[0]
98         name = qs.get('name', [None])[0]
99         clip_id = qs.get('clip', [None])[0]
100         course = qs.get('course', [None])[0]
101
102         if any(not f for f in (author, name, clip_id, course,)):
103             raise ExtractorError('Invalid URL', expected=True)
104
105         display_id = '%s-%s' % (name, clip_id)
106
107         webpage = self._download_webpage(url, display_id)
108
109         modules = self._search_regex(
110             r'moduleCollection\s*:\s*new\s+ModuleCollection\((\[.+?\])\s*,\s*\$rootScope\)',
111             webpage, 'modules', default=None)
112
113         if modules:
114             collection = self._parse_json(modules, display_id)
115         else:
116             # Webpage may be served in different layout (see
117             # https://github.com/rg3/youtube-dl/issues/7607)
118             collection = self._parse_json(
119                 self._search_regex(
120                     r'var\s+initialState\s*=\s*({.+?});\n', webpage, 'initial state'),
121                 display_id)['course']['modules']
122
123         module, clip = None, None
124
125         for module_ in collection:
126             if name in (module_.get('moduleName'), module_.get('name')):
127                 module = module_
128                 for clip_ in module_.get('clips', []):
129                     clip_index = clip_.get('clipIndex')
130                     if clip_index is None:
131                         clip_index = clip_.get('index')
132                     if clip_index is None:
133                         continue
134                     if compat_str(clip_index) == clip_id:
135                         clip = clip_
136                         break
137
138         if not clip:
139             raise ExtractorError('Unable to resolve clip')
140
141         QUALITIES = {
142             'low': {'width': 640, 'height': 480},
143             'medium': {'width': 848, 'height': 640},
144             'high': {'width': 1024, 'height': 768},
145             'high-widescreen': {'width': 1280, 'height': 720},
146         }
147
148         QUALITIES_PREFERENCE = ('low', 'medium', 'high', 'high-widescreen',)
149         quality_key = qualities(QUALITIES_PREFERENCE)
150
151         AllowedQuality = collections.namedtuple('AllowedQuality', ['ext', 'qualities'])
152
153         ALLOWED_QUALITIES = (
154             AllowedQuality('webm', ['high', ]),
155             AllowedQuality('mp4', ['low', 'medium', 'high', ]),
156         )
157
158         # Some courses also offer widescreen resolution for high quality (see
159         # https://github.com/rg3/youtube-dl/issues/7766)
160         widescreen = True if re.search(
161             r'courseSupportsWidescreenVideoFormats\s*:\s*true', webpage) else False
162         best_quality = 'high-widescreen' if widescreen else 'high'
163         if widescreen:
164             for allowed_quality in ALLOWED_QUALITIES:
165                 allowed_quality.qualities.append(best_quality)
166
167         # In order to minimize the number of calls to ViewClip API and reduce
168         # the probability of being throttled or banned by Pluralsight we will request
169         # only single format until formats listing was explicitly requested.
170         if self._downloader.params.get('listformats', False):
171             allowed_qualities = ALLOWED_QUALITIES
172         else:
173             def guess_allowed_qualities():
174                 req_format = self._downloader.params.get('format') or 'best'
175                 req_format_split = req_format.split('-', 1)
176                 if len(req_format_split) > 1:
177                     req_ext, req_quality = req_format_split
178                     for allowed_quality in ALLOWED_QUALITIES:
179                         if req_ext == allowed_quality.ext and req_quality in allowed_quality.qualities:
180                             return (AllowedQuality(req_ext, (req_quality, )), )
181                 req_ext = 'webm' if self._downloader.params.get('prefer_free_formats') else 'mp4'
182                 return (AllowedQuality(req_ext, (best_quality, )), )
183             allowed_qualities = guess_allowed_qualities()
184
185         formats = []
186         for ext, qualities_ in allowed_qualities:
187             for quality in qualities_:
188                 f = QUALITIES[quality].copy()
189                 clip_post = {
190                     'a': author,
191                     'cap': 'false',
192                     'cn': clip_id,
193                     'course': course,
194                     'lc': 'en',
195                     'm': name,
196                     'mt': ext,
197                     'q': '%dx%d' % (f['width'], f['height']),
198                 }
199                 request = sanitized_Request(
200                     '%s/training/Player/ViewClip' % self._API_BASE,
201                     json.dumps(clip_post).encode('utf-8'))
202                 request.add_header('Content-Type', 'application/json;charset=utf-8')
203                 format_id = '%s-%s' % (ext, quality)
204                 clip_url = self._download_webpage(
205                     request, display_id, 'Downloading %s URL' % format_id, fatal=False)
206
207                 # Pluralsight tracks multiple sequential calls to ViewClip API and start
208                 # to return 429 HTTP errors after some time (see
209                 # https://github.com/rg3/youtube-dl/pull/6989). Moreover it may even lead
210                 # to account ban (see https://github.com/rg3/youtube-dl/issues/6842).
211                 # To somewhat reduce the probability of these consequences
212                 # we will sleep random amount of time before each call to ViewClip.
213                 self._sleep(
214                     random.randint(2, 5), display_id,
215                     '%(video_id)s: Waiting for %(timeout)s seconds to avoid throttling')
216
217                 if not clip_url:
218                     continue
219                 f.update({
220                     'url': clip_url,
221                     'ext': ext,
222                     'format_id': format_id,
223                     'quality': quality_key(quality),
224                 })
225                 formats.append(f)
226         self._sort_formats(formats)
227
228         # TODO: captions
229         # http://www.pluralsight.com/training/Player/ViewClip + cap = true
230         # or
231         # http://www.pluralsight.com/training/Player/Captions
232         # { a = author, cn = clip_id, lc = end, m = name }
233
234         return {
235             'id': clip.get('clipName') or clip['name'],
236             'title': '%s - %s' % (module['title'], clip['title']),
237             'duration': int_or_none(clip.get('duration')) or parse_duration(clip.get('formattedDuration')),
238             'creator': author,
239             'formats': formats
240         }
241
242
243 class PluralsightCourseIE(PluralsightBaseIE):
244     IE_NAME = 'pluralsight:course'
245     _VALID_URL = r'https?://(?:(?:www|app)\.)?pluralsight\.com/(?:library/)?courses/(?P<id>[^/]+)'
246     _TESTS = [{
247         # Free course from Pluralsight Starter Subscription for Microsoft TechNet
248         # https://offers.pluralsight.com/technet?loc=zTS3z&prod=zOTprodz&tech=zOttechz&prog=zOTprogz&type=zSOz&media=zOTmediaz&country=zUSz
249         'url': 'http://www.pluralsight.com/courses/hosting-sql-server-windows-azure-iaas',
250         'info_dict': {
251             'id': 'hosting-sql-server-windows-azure-iaas',
252             'title': 'Hosting SQL Server in Microsoft Azure IaaS Fundamentals',
253             'description': 'md5:61b37e60f21c4b2f91dc621a977d0986',
254         },
255         'playlist_count': 31,
256     }, {
257         # available without pluralsight account
258         'url': 'https://www.pluralsight.com/courses/angularjs-get-started',
259         'only_matching': True,
260     }, {
261         'url': 'https://app.pluralsight.com/library/courses/understanding-microsoft-azure-amazon-aws/table-of-contents',
262         'only_matching': True,
263     }]
264
265     def _real_extract(self, url):
266         course_id = self._match_id(url)
267
268         # TODO: PSM cookie
269
270         course = self._download_json(
271             '%s/data/course/%s' % (self._API_BASE, course_id),
272             course_id, 'Downloading course JSON')
273
274         title = course['title']
275         description = course.get('description') or course.get('shortDescription')
276
277         course_data = self._download_json(
278             '%s/data/course/content/%s' % (self._API_BASE, course_id),
279             course_id, 'Downloading course data JSON')
280
281         entries = []
282         for num, module in enumerate(course_data, 1):
283             for clip in module.get('clips', []):
284                 player_parameters = clip.get('playerParameters')
285                 if not player_parameters:
286                     continue
287                 entries.append({
288                     '_type': 'url_transparent',
289                     'url': '%s/training/player?%s' % (self._API_BASE, player_parameters),
290                     'ie_key': PluralsightIE.ie_key(),
291                     'chapter': module.get('title'),
292                     'chapter_number': num,
293                     'chapter_id': module.get('moduleRef'),
294                 })
295
296         return self.playlist_result(entries, course_id, title, description)