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Diffstat (limited to 'youtube_dl/extractor/pluralsight.py')
| -rw-r--r-- | youtube_dl/extractor/pluralsight.py | 291 |
1 files changed, 291 insertions, 0 deletions
diff --git a/youtube_dl/extractor/pluralsight.py b/youtube_dl/extractor/pluralsight.py new file mode 100644 index 000000000..55c11b3bf --- /dev/null +++ b/youtube_dl/extractor/pluralsight.py @@ -0,0 +1,291 @@ +from __future__ import unicode_literals + +import re +import json +import random +import collections + +from .common import InfoExtractor +from ..compat import ( + compat_str, + compat_urllib_parse, + compat_urlparse, +) +from ..utils import ( + ExtractorError, + int_or_none, + parse_duration, + qualities, + sanitized_Request, +) + + +class PluralsightBaseIE(InfoExtractor): + _API_BASE = 'http://app.pluralsight.com' + + +class PluralsightIE(PluralsightBaseIE): + IE_NAME = 'pluralsight' + _VALID_URL = r'https?://(?:(?:www|app)\.)?pluralsight\.com/training/player\?' + _LOGIN_URL = 'https://app.pluralsight.com/id/' + + _NETRC_MACHINE = 'pluralsight' + + _TESTS = [{ + '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', + 'md5': '4d458cf5cf4c593788672419a8dd4cf8', + 'info_dict': { + 'id': 'hosting-sql-server-windows-azure-iaas-m7-mgmt-04', + 'ext': 'mp4', + 'title': 'Management of SQL Server - Demo Monitoring', + 'duration': 338, + }, + 'skip': 'Requires pluralsight account credentials', + }, { + 'url': 'https://app.pluralsight.com/training/player?course=angularjs-get-started&author=scott-allen&name=angularjs-get-started-m1-introduction&clip=0&mode=live', + 'only_matching': True, + }, { + # available without pluralsight account + 'url': 'http://app.pluralsight.com/training/player?author=scott-allen&name=angularjs-get-started-m1-introduction&mode=live&clip=0&course=angularjs-get-started', + 'only_matching': True, + }] + + def _real_initialize(self): + self._login() + + def _login(self): + (username, password) = self._get_login_info() + if username is None: + return + + login_page = self._download_webpage( + self._LOGIN_URL, None, 'Downloading login page') + + login_form = self._hidden_inputs(login_page) + + login_form.update({ + 'Username': username.encode('utf-8'), + 'Password': password.encode('utf-8'), + }) + + post_url = self._search_regex( + r'<form[^>]+action=(["\'])(?P<url>.+?)\1', login_page, + 'post url', default=self._LOGIN_URL, group='url') + + if not post_url.startswith('http'): + post_url = compat_urlparse.urljoin(self._LOGIN_URL, post_url) + + request = sanitized_Request( + post_url, compat_urllib_parse.urlencode(login_form).encode('utf-8')) + request.add_header('Content-Type', 'application/x-www-form-urlencoded') + + response = self._download_webpage( + request, None, 'Logging in as %s' % username) + + error = self._search_regex( + r'<span[^>]+class="field-validation-error"[^>]*>([^<]+)</span>', + response, 'error message', default=None) + if error: + raise ExtractorError('Unable to login: %s' % error, expected=True) + + if all(p not in response for p in ('__INITIAL_STATE__', '"currentUser"')): + raise ExtractorError('Unable to log in') + + def _real_extract(self, url): + qs = compat_urlparse.parse_qs(compat_urlparse.urlparse(url).query) + + author = qs.get('author', [None])[0] + name = qs.get('name', [None])[0] + clip_id = qs.get('clip', [None])[0] + course = qs.get('course', [None])[0] + + if any(not f for f in (author, name, clip_id, course,)): + raise ExtractorError('Invalid URL', expected=True) + + display_id = '%s-%s' % (name, clip_id) + + webpage = self._download_webpage(url, display_id) + + modules = self._search_regex( + r'moduleCollection\s*:\s*new\s+ModuleCollection\((\[.+?\])\s*,\s*\$rootScope\)', + webpage, 'modules', default=None) + + if modules: + collection = self._parse_json(modules, display_id) + else: + # Webpage may be served in different layout (see + # https://github.com/rg3/youtube-dl/issues/7607) + collection = self._parse_json( + self._search_regex( + r'var\s+initialState\s*=\s*({.+?});\n', webpage, 'initial state'), + display_id)['course']['modules'] + + module, clip = None, None + + for module_ in collection: + if name in (module_.get('moduleName'), module_.get('name')): + module = module_ + for clip_ in module_.get('clips', []): + clip_index = clip_.get('clipIndex') + if clip_index is None: + clip_index = clip_.get('index') + if clip_index is None: + continue + if compat_str(clip_index) == clip_id: + clip = clip_ + break + + if not clip: + raise ExtractorError('Unable to resolve clip') + + QUALITIES = { + 'low': {'width': 640, 'height': 480}, + 'medium': {'width': 848, 'height': 640}, + 'high': {'width': 1024, 'height': 768}, + 'high-widescreen': {'width': 1280, 'height': 720}, + } + + QUALITIES_PREFERENCE = ('low', 'medium', 'high', 'high-widescreen',) + quality_key = qualities(QUALITIES_PREFERENCE) + + AllowedQuality = collections.namedtuple('AllowedQuality', ['ext', 'qualities']) + + ALLOWED_QUALITIES = ( + AllowedQuality('webm', ['high', ]), + AllowedQuality('mp4', ['low', 'medium', 'high', ]), + ) + + # Some courses also offer widescreen resolution for high quality (see + # https://github.com/rg3/youtube-dl/issues/7766) + widescreen = True if re.search( + r'courseSupportsWidescreenVideoFormats\s*:\s*true', webpage) else False + best_quality = 'high-widescreen' if widescreen else 'high' + if widescreen: + for allowed_quality in ALLOWED_QUALITIES: + allowed_quality.qualities.append(best_quality) + + # In order to minimize the number of calls to ViewClip API and reduce + # the probability of being throttled or banned by Pluralsight we will request + # only single format until formats listing was explicitly requested. + if self._downloader.params.get('listformats', False): + allowed_qualities = ALLOWED_QUALITIES + else: + def guess_allowed_qualities(): + req_format = self._downloader.params.get('format') or 'best' + req_format_split = req_format.split('-', 1) + if len(req_format_split) > 1: + req_ext, req_quality = req_format_split + for allowed_quality in ALLOWED_QUALITIES: + if req_ext == allowed_quality.ext and req_quality in allowed_quality.qualities: + return (AllowedQuality(req_ext, (req_quality, )), ) + req_ext = 'webm' if self._downloader.params.get('prefer_free_formats') else 'mp4' + return (AllowedQuality(req_ext, (best_quality, )), ) + allowed_qualities = guess_allowed_qualities() + + formats = [] + for ext, qualities_ in allowed_qualities: + for quality in qualities_: + f = QUALITIES[quality].copy() + clip_post = { + 'a': author, + 'cap': 'false', + 'cn': clip_id, + 'course': course, + 'lc': 'en', + 'm': name, + 'mt': ext, + 'q': '%dx%d' % (f['width'], f['height']), + } + request = sanitized_Request( + '%s/training/Player/ViewClip' % self._API_BASE, + json.dumps(clip_post).encode('utf-8')) + request.add_header('Content-Type', 'application/json;charset=utf-8') + format_id = '%s-%s' % (ext, quality) + clip_url = self._download_webpage( + request, display_id, 'Downloading %s URL' % format_id, fatal=False) + + # Pluralsight tracks multiple sequential calls to ViewClip API and start + # to return 429 HTTP errors after some time (see + # https://github.com/rg3/youtube-dl/pull/6989). Moreover it may even lead + # to account ban (see https://github.com/rg3/youtube-dl/issues/6842). + # To somewhat reduce the probability of these consequences + # we will sleep random amount of time before each call to ViewClip. + self._sleep( + random.randint(2, 5), display_id, + '%(video_id)s: Waiting for %(timeout)s seconds to avoid throttling') + + if not clip_url: + continue + f.update({ + 'url': clip_url, + 'ext': ext, + 'format_id': format_id, + 'quality': quality_key(quality), + }) + formats.append(f) + self._sort_formats(formats) + + # TODO: captions + # http://www.pluralsight.com/training/Player/ViewClip + cap = true + # or + # http://www.pluralsight.com/training/Player/Captions + # { a = author, cn = clip_id, lc = end, m = name } + + return { + 'id': clip['clipName'], + 'title': '%s - %s' % (module['title'], clip['title']), + 'duration': int_or_none(clip.get('duration')) or parse_duration(clip.get('formattedDuration')), + 'creator': author, + 'formats': formats + } + + +class PluralsightCourseIE(PluralsightBaseIE): + IE_NAME = 'pluralsight:course' + _VALID_URL = r'https?://(?:(?:www|app)\.)?pluralsight\.com/(?:library/)?courses/(?P<id>[^/]+)' + _TESTS = [{ + # Free course from Pluralsight Starter Subscription for Microsoft TechNet + # https://offers.pluralsight.com/technet?loc=zTS3z&prod=zOTprodz&tech=zOttechz&prog=zOTprogz&type=zSOz&media=zOTmediaz&country=zUSz + 'url': 'http://www.pluralsight.com/courses/hosting-sql-server-windows-azure-iaas', + 'info_dict': { + 'id': 'hosting-sql-server-windows-azure-iaas', + 'title': 'Hosting SQL Server in Microsoft Azure IaaS Fundamentals', + 'description': 'md5:61b37e60f21c4b2f91dc621a977d0986', + }, + 'playlist_count': 31, + }, { + # available without pluralsight account + 'url': 'https://www.pluralsight.com/courses/angularjs-get-started', + 'only_matching': True, + }, { + 'url': 'https://app.pluralsight.com/library/courses/understanding-microsoft-azure-amazon-aws/table-of-contents', + 'only_matching': True, + }] + + def _real_extract(self, url): + course_id = self._match_id(url) + + # TODO: PSM cookie + + course = self._download_json( + '%s/data/course/%s' % (self._API_BASE, course_id), + course_id, 'Downloading course JSON') + + title = course['title'] + description = course.get('description') or course.get('shortDescription') + + course_data = self._download_json( + '%s/data/course/content/%s' % (self._API_BASE, course_id), + course_id, 'Downloading course data JSON') + + entries = [] + for module in course_data: + for clip in module.get('clips', []): + player_parameters = clip.get('playerParameters') + if not player_parameters: + continue + entries.append(self.url_result( + '%s/training/player?%s' % (self._API_BASE, player_parameters), + 'Pluralsight')) + + return self.playlist_result(entries, course_id, title, description) |