aboutsummaryrefslogtreecommitdiffhomepage
path: root/youtube_dl/extractor/udemy.py
blob: 195f5ce78d308126a1077cda11a4c00b437343fe (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
from __future__ import unicode_literals

import re

from .common import InfoExtractor
from ..compat import (
    compat_HTTPError,
    compat_str,
    compat_urllib_request,
    compat_urlparse,
)
from ..utils import (
    determine_ext,
    extract_attributes,
    ExtractorError,
    float_or_none,
    int_or_none,
    js_to_json,
    sanitized_Request,
    unescapeHTML,
    urlencode_postdata,
)


class UdemyIE(InfoExtractor):
    IE_NAME = 'udemy'
    _VALID_URL = r'''(?x)
                    https?://
                        www\.udemy\.com/
                        (?:
                            [^#]+\#/lecture/|
                            lecture/view/?\?lectureId=|
                            [^/]+/learn/v4/t/lecture/
                        )
                        (?P<id>\d+)
                    '''
    _LOGIN_URL = 'https://www.udemy.com/join/login-popup/?displayType=ajax&showSkipButton=1'
    _ORIGIN_URL = 'https://www.udemy.com'
    _NETRC_MACHINE = 'udemy'

    _TESTS = [{
        'url': 'https://www.udemy.com/java-tutorial/#/lecture/172757',
        'md5': '98eda5b657e752cf945d8445e261b5c5',
        'info_dict': {
            'id': '160614',
            'ext': 'mp4',
            'title': 'Introduction and Installation',
            'description': 'md5:c0d51f6f21ef4ec65f091055a5eef876',
            'duration': 579.29,
        },
        'skip': 'Requires udemy account credentials',
    }, {
        # new URL schema
        'url': 'https://www.udemy.com/electric-bass-right-from-the-start/learn/v4/t/lecture/4580906',
        'only_matching': True,
    }, {
        # no url in outputs format entry
        'url': 'https://www.udemy.com/learn-web-development-complete-step-by-step-guide-to-success/learn/v4/t/lecture/4125812',
        'only_matching': True,
    }]

    def _extract_course_info(self, webpage, video_id):
        course = self._parse_json(
            unescapeHTML(self._search_regex(
                r'ng-init=["\'].*\bcourse=({.+?})[;"\']',
                webpage, 'course', default='{}')),
            video_id, fatal=False) or {}
        course_id = course.get('id') or self._search_regex(
            r'data-course-id=["\'](\d+)', webpage, 'course id')
        return course_id, course.get('title')

    def _enroll_course(self, base_url, webpage, course_id):
        def combine_url(base_url, url):
            return compat_urlparse.urljoin(base_url, url) if not url.startswith('http') else url

        checkout_url = unescapeHTML(self._search_regex(
            r'href=(["\'])(?P<url>(?:https?://(?:www\.)?udemy\.com)?/(?:payment|cart)/checkout/.+?)\1',
            webpage, 'checkout url', group='url', default=None))
        if checkout_url:
            raise ExtractorError(
                'Course %s is not free. You have to pay for it before you can download. '
                'Use this URL to confirm purchase: %s'
                % (course_id, combine_url(base_url, checkout_url)),
                expected=True)

        enroll_url = unescapeHTML(self._search_regex(
            r'href=(["\'])(?P<url>(?:https?://(?:www\.)?udemy\.com)?/course/subscribe/.+?)\1',
            webpage, 'enroll url', group='url', default=None))
        if enroll_url:
            webpage = self._download_webpage(
                combine_url(base_url, enroll_url),
                course_id, 'Enrolling in the course',
                headers={'Referer': base_url})
            if '>You have enrolled in' in webpage:
                self.to_screen('%s: Successfully enrolled in the course' % course_id)

    def _download_lecture(self, course_id, lecture_id):
        return self._download_json(
            'https://www.udemy.com/api-2.0/users/me/subscribed-courses/%s/lectures/%s?'
            % (course_id, lecture_id),
            lecture_id, 'Downloading lecture JSON', query={
                'fields[lecture]': 'title,description,view_html,asset',
                'fields[asset]': 'asset_type,stream_url,thumbnail_url,download_urls,data',
            })

    def _handle_error(self, response):
        if not isinstance(response, dict):
            return
        error = response.get('error')
        if error:
            error_str = 'Udemy returned error #%s: %s' % (error.get('code'), error.get('message'))
            error_data = error.get('data')
            if error_data:
                error_str += ' - %s' % error_data.get('formErrors')
            raise ExtractorError(error_str, expected=True)

    def _download_json(self, url_or_request, *args, **kwargs):
        headers = {
            'X-Udemy-Snail-Case': 'true',
            'X-Requested-With': 'XMLHttpRequest',
        }
        for cookie in self._downloader.cookiejar:
            if cookie.name == 'client_id':
                headers['X-Udemy-Client-Id'] = cookie.value
            elif cookie.name == 'access_token':
                headers['X-Udemy-Bearer-Token'] = cookie.value
                headers['X-Udemy-Authorization'] = 'Bearer %s' % cookie.value

        if isinstance(url_or_request, compat_urllib_request.Request):
            for header, value in headers.items():
                url_or_request.add_header(header, value)
        else:
            url_or_request = sanitized_Request(url_or_request, headers=headers)

        response = super(UdemyIE, self)._download_json(url_or_request, *args, **kwargs)
        self._handle_error(response)
        return response

    def _real_initialize(self):
        self._login()

    def _login(self):
        (username, password) = self._get_login_info()
        if username is None:
            return

        login_popup = self._download_webpage(
            self._LOGIN_URL, None, 'Downloading login popup')

        def is_logged(webpage):
            return any(re.search(p, webpage) for p in (
                r'href=["\'](?:https://www\.udemy\.com)?/user/logout/',
                r'>Logout<'))

        # already logged in
        if is_logged(login_popup):
            return

        login_form = self._form_hidden_inputs('login-form', login_popup)

        login_form.update({
            'email': username,
            'password': password,
        })

        response = self._download_webpage(
            self._LOGIN_URL, None, 'Logging in',
            data=urlencode_postdata(login_form),
            headers={
                'Referer': self._ORIGIN_URL,
                'Origin': self._ORIGIN_URL,
            })

        if not is_logged(response):
            error = self._html_search_regex(
                r'(?s)<div[^>]+class="form-errors[^"]*">(.+?)</div>',
                response, 'error message', default=None)
            if error:
                raise ExtractorError('Unable to login: %s' % error, expected=True)
            raise ExtractorError('Unable to log in')

    def _real_extract(self, url):
        lecture_id = self._match_id(url)

        webpage = self._download_webpage(url, lecture_id)

        course_id, _ = self._extract_course_info(webpage, lecture_id)

        try:
            lecture = self._download_lecture(course_id, lecture_id)
        except ExtractorError as e:
            # Error could possibly mean we are not enrolled in the course
            if isinstance(e.cause, compat_HTTPError) and e.cause.code == 403:
                self._enroll_course(url, webpage, course_id)
                lecture = self._download_lecture(course_id, lecture_id)
            else:
                raise

        title = lecture['title']
        description = lecture.get('description')

        asset = lecture['asset']

        asset_type = asset.get('asset_type') or asset.get('assetType')
        if asset_type != 'Video':
            raise ExtractorError(
                'Lecture %s is not a video' % lecture_id, expected=True)

        stream_url = asset.get('stream_url') or asset.get('streamUrl')
        if stream_url:
            youtube_url = self._search_regex(
                r'(https?://www\.youtube\.com/watch\?v=.*)', stream_url, 'youtube URL', default=None)
            if youtube_url:
                return self.url_result(youtube_url, 'Youtube')

        video_id = compat_str(asset['id'])
        thumbnail = asset.get('thumbnail_url') or asset.get('thumbnailUrl')
        duration = float_or_none(asset.get('data', {}).get('duration'))

        subtitles = {}
        automatic_captions = {}

        formats = []

        def extract_output_format(src, f_id):
            return {
                'url': src.get('url'),
                'format_id': '%sp' % (src.get('height') or f_id),
                'width': int_or_none(src.get('width')),
                'height': int_or_none(src.get('height')),
                'vbr': int_or_none(src.get('video_bitrate_in_kbps')),
                'vcodec': src.get('video_codec'),
                'fps': int_or_none(src.get('frame_rate')),
                'abr': int_or_none(src.get('audio_bitrate_in_kbps')),
                'acodec': src.get('audio_codec'),
                'asr': int_or_none(src.get('audio_sample_rate')),
                'tbr': int_or_none(src.get('total_bitrate_in_kbps')),
                'filesize': int_or_none(src.get('file_size_in_bytes')),
            }

        outputs = asset.get('data', {}).get('outputs')
        if not isinstance(outputs, dict):
            outputs = {}

        def add_output_format_meta(f, key):
            output = outputs.get(key)
            if isinstance(output, dict):
                output_format = extract_output_format(output, key)
                output_format.update(f)
                return output_format
            return f

        def extract_formats(source_list):
            if not isinstance(source_list, list):
                return
            for source in source_list:
                video_url = source.get('file') or source.get('src')
                if not video_url or not isinstance(video_url, compat_str):
                    continue
                if source.get('type') == 'application/x-mpegURL' or determine_ext(video_url) == 'm3u8':
                    formats.extend(self._extract_m3u8_formats(
                        video_url, video_id, 'mp4', entry_protocol='m3u8_native',
                        m3u8_id='hls', fatal=False))
                    continue
                format_id = source.get('label')
                f = {
                    'url': video_url,
                    'format_id': '%sp' % format_id,
                    'height': int_or_none(format_id),
                }
                if format_id:
                    # Some videos contain additional metadata (e.g.
                    # https://www.udemy.com/ios9-swift/learn/#/lecture/3383208)
                    f = add_output_format_meta(f, format_id)
                formats.append(f)

        def extract_subtitles(track_list):
            if not isinstance(track_list, list):
                return
            for track in track_list:
                if not isinstance(track, dict):
                    continue
                if track.get('kind') != 'captions':
                    continue
                src = track.get('src')
                if not src or not isinstance(src, compat_str):
                    continue
                lang = track.get('language') or track.get(
                    'srclang') or track.get('label')
                sub_dict = automatic_captions if track.get(
                    'autogenerated') is True else subtitles
                sub_dict.setdefault(lang, []).append({
                    'url': src,
                })

        download_urls = asset.get('download_urls')
        if isinstance(download_urls, dict):
            extract_formats(download_urls.get('Video'))

        view_html = lecture.get('view_html')
        if view_html:
            view_html_urls = set()
            for source in re.findall(r'<source[^>]+>', view_html):
                attributes = extract_attributes(source)
                src = attributes.get('src')
                if not src:
                    continue
                res = attributes.get('data-res')
                height = int_or_none(res)
                if src in view_html_urls:
                    continue
                view_html_urls.add(src)
                if attributes.get('type') == 'application/x-mpegURL' or determine_ext(src) == 'm3u8':
                    m3u8_formats = self._extract_m3u8_formats(
                        src, video_id, 'mp4', entry_protocol='m3u8_native',
                        m3u8_id='hls', fatal=False)
                    for f in m3u8_formats:
                        m = re.search(r'/hls_(?P<height>\d{3,4})_(?P<tbr>\d{2,})/', f['url'])
                        if m:
                            if not f.get('height'):
                                f['height'] = int(m.group('height'))
                            if not f.get('tbr'):
                                f['tbr'] = int(m.group('tbr'))
                    formats.extend(m3u8_formats)
                else:
                    formats.append(add_output_format_meta({
                        'url': src,
                        'format_id': '%dp' % height if height else None,
                        'height': height,
                    }, res))

            # react rendition since 2017.04.15 (see
            # https://github.com/rg3/youtube-dl/issues/12744)
            data = self._parse_json(
                self._search_regex(
                    r'videojs-setup-data=(["\'])(?P<data>{.+?})\1', view_html,
                    'setup data', default='{}', group='data'), video_id,
                transform_source=unescapeHTML, fatal=False)
            if data and isinstance(data, dict):
                extract_formats(data.get('sources'))
                if not duration:
                    duration = int_or_none(data.get('duration'))
                extract_subtitles(data.get('tracks'))

            if not subtitles and not automatic_captions:
                text_tracks = self._parse_json(
                    self._search_regex(
                        r'text-tracks=(["\'])(?P<data>\[.+?\])\1', view_html,
                        'text tracks', default='{}', group='data'), video_id,
                    transform_source=lambda s: js_to_json(unescapeHTML(s)),
                    fatal=False)
                extract_subtitles(text_tracks)

        self._sort_formats(formats, field_preference=('height', 'width', 'tbr', 'format_id'))

        return {
            'id': video_id,
            'title': title,
            'description': description,
            'thumbnail': thumbnail,
            'duration': duration,
            'formats': formats,
            'subtitles': subtitles,
            'automatic_captions': automatic_captions,
        }


class UdemyCourseIE(UdemyIE):
    IE_NAME = 'udemy:course'
    _VALID_URL = r'https?://(?:www\.)?udemy\.com/(?P<id>[^/?#&]+)'
    _TESTS = []

    @classmethod
    def suitable(cls, url):
        return False if UdemyIE.suitable(url) else super(UdemyCourseIE, cls).suitable(url)

    def _real_extract(self, url):
        course_path = self._match_id(url)

        webpage = self._download_webpage(url, course_path)

        course_id, title = self._extract_course_info(webpage, course_path)

        self._enroll_course(url, webpage, course_id)

        response = self._download_json(
            'https://www.udemy.com/api-2.0/courses/%s/cached-subscriber-curriculum-items' % course_id,
            course_id, 'Downloading course curriculum', query={
                'fields[chapter]': 'title,object_index',
                'fields[lecture]': 'title,asset',
                'page_size': '1000',
            })

        entries = []
        chapter, chapter_number = [None] * 2
        for entry in response['results']:
            clazz = entry.get('_class')
            if clazz == 'lecture':
                asset = entry.get('asset')
                if isinstance(asset, dict):
                    asset_type = asset.get('asset_type') or asset.get('assetType')
                    if asset_type != 'Video':
                        continue
                lecture_id = entry.get('id')
                if lecture_id:
                    entry = {
                        '_type': 'url_transparent',
                        'url': 'https://www.udemy.com/%s/learn/v4/t/lecture/%s' % (course_path, entry['id']),
                        'title': entry.get('title'),
                        'ie_key': UdemyIE.ie_key(),
                    }
                    if chapter_number:
                        entry['chapter_number'] = chapter_number
                    if chapter:
                        entry['chapter'] = chapter
                    entries.append(entry)
            elif clazz == 'chapter':
                chapter_number = entry.get('object_index')
                chapter = entry.get('title')

        return self.playlist_result(entries, course_id, title)