youtube-dl/youtube_dl/extractor/frontendmaster.py

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2018-04-26 19:33:09 +00:00
# coding: utf-8
from __future__ import unicode_literals
import collections
import re
from .common import InfoExtractor
from ..compat import (
compat_urlparse)
from ..utils import (
ExtractorError,
urlencode_postdata,
qualities, unescapeHTML)
class FrontEndMasterBaseIE(InfoExtractor):
_API_BASE = 'https://api.frontendmasters.com/v1/kabuki/courses'
_VIDEO_BASE = 'http://www.frontendmasters.com/courses'
_CAPTIONS_BASE = 'https://api.frontendmasters.com/v1/kabuki/transcripts'
_COOKIES_BASE = 'https://api.frontendmasters.com'
_LOGIN_URL = 'https://frontendmasters.com/login/'
_QUALITIES_PREFERENCE = ('low', 'medium', 'high')
_QUALITIES = {
'low': {'width': 480, 'height': 360},
'medium': {'width': 1280, 'height': 720},
'high': {'width': 1920, 'height': 1080}
}
AllowedQuality = collections.namedtuple('AllowedQuality',
['ext', 'qualities'])
_ALLOWED_QUALITIES = [
AllowedQuality('webm', ['low', 'medium', 'high']),
AllowedQuality('mp4', ['low', 'medium', 'high'])
]
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,
'password': password
})
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)
response = self._download_webpage(
post_url, None, 'Logging in',
data=urlencode_postdata(login_form),
headers={'Content-Type': 'application/x-www-form-urlencoded'}
)
error = self._search_regex(
r'<div[^>]+class=["\']Message MessageAlert["\'][^>]*>'
r'([^<]+)'
r'</div>',
response, 'error message', default=None)
if error:
raise ExtractorError('Unable to login: %s' % unescapeHTML(error),
expected=True)
def _download_course(self, course_id, url):
response = self._download_json(
'%s/%s' % (self._API_BASE, course_id), course_id,
'Downloading course JSON',
headers={
'Content-Type': 'application/json;charset=utf-8',
'Referer': url,
})
return response
@staticmethod
def _pair_section_video_element(lesson_elements):
sections = {}
current_section = None
current_section_number = 0
for elem in lesson_elements:
if not isinstance(elem, int):
elem_name = elem
if not isinstance(elem_name, str):
# convert unicode to str
elem_name = elem.encode('utf-8')
(current_section, current_section_number) = \
(elem_name, current_section_number + 1)
else:
if current_section:
sections[elem] = (current_section, current_section_number)
return sections
class FrontEndMasterIE(FrontEndMasterBaseIE):
IE_NAME = 'frontend-masters'
_VALID_URL = r'https?://(?:www\.)?frontendmasters\.com/courses/' \
r'(?P<courseid>[a-z\-]+)/' \
r'(?P<id>[a-z\-]+)'
_NETRC_MACHINE = 'frontendmasters'
_TEST = {
'url': 'https://frontendmasters.com/courses/web-development/tools',
'md5': '7f161159710d6b7016a4f4af6fcb05e2',
'info_dict': {
'id': 'tools',
'title': 'Tools',
'display_id': 'tools',
'description': 'md5:82c1ea6472e88ed5acd1829fe992e4f7',
'ext': 'mp4'
},
'skip': 'Requires FrontendMasters account credentials',
}
def _get_subtitles(self, video_hash, video_id):
captions = self._download_webpage(
'%s/%s.vtt' % (self._CAPTIONS_BASE, video_hash), video_id,
fatal=False)
if captions:
return {
'en': [{
'ext': 'vtt',
'data': captions
}]
}
def _real_extract(self, url):
mobj = re.match(self._VALID_URL, url)
video_id = mobj.group('id')
course_id = mobj.group('courseid')
course_json_content = self._download_course(course_id=course_id,
url=url)
# Necessary to get mandatory informations like title and video_url
lesson_index = course_json_content.get('lessonSlugs').index(video_id)
lesson_hash = course_json_content.get('lessonHashes')[lesson_index]
lesson_data = course_json_content.get('lessonData')[lesson_hash]
# This is necessary to get the link for the video
lesson_source_base = lesson_data['sourceBase']
lesson_title = lesson_data['title']
# Some optional fields
lesson_description = lesson_data.get('description')
lesson_index = lesson_data.get('index')
lesson_slug = lesson_data.get('slug')
lesson_thumbnail_url = lesson_data.get('thumbnail')
lesson_section_elements = course_json_content.get('lessonElements')
try:
course_sections_pairing = self._pair_section_video_element(
lesson_section_elements)
lesson_section = \
course_sections_pairing.get(lesson_index)[0]
lesson_section_number = \
course_sections_pairing.get(lesson_index)[1]
except Exception:
lesson_section = None
lesson_section_number = None
video_request_url = '%s/source'
video_request_headers = {
'origin': 'https://frontendmasters.com',
'referer': lesson_source_base,
}
quality_key = qualities(self._QUALITIES_PREFERENCE)
formats = []
for ext, qualities_ in self._ALLOWED_QUALITIES:
for quality in qualities_:
f = self._QUALITIES[quality].copy()
video_request_params = {
'r': f['height'],
'f': ext
}
video_response = self._download_json(
video_request_url % lesson_source_base, video_id,
query=video_request_params, headers=video_request_headers)
video_url = video_response.get('url')
clip_f = f.copy()
clip_f.update({
'url': video_url,
'ext': ext,
'format_id': '%s-%s' % (ext, quality),
'quality': quality_key(quality),
'height': f['height']
})
formats.append(clip_f)
self._sort_formats(formats)
subtitles = self.extract_subtitles(lesson_hash, video_id)
return {
'id': video_id,
'display_id': lesson_slug,
'title': lesson_title,
'description': lesson_description,
'chapter': lesson_section,
'chapter_number': lesson_section_number,
'thumbnail': lesson_thumbnail_url,
'formats': formats,
'subtitles': subtitles
}
class FrontEndMasterCourseIE(FrontEndMasterBaseIE):
IE_NAME = 'frontend-masters:course'
_VALID_URL = r'https?://(?:www\.)?frontendmasters\.com/courses/(?P<courseid>[a-z\-]+)/?$'
_NETRC_MACHINE = 'frontendmasters'
_TEST = {
'url': 'https://frontendmasters.com/courses/javascript-basics/',
'info_dict': {
'id': 'javascript-basics',
'title': 'Introduction to JavaScript Programming',
'description': 'md5:269412fbb76d86954761599ad8e4cbc9'
},
'playlist_count': 19,
'skip': 'Requires FrontendMasters account credentials'
}
@classmethod
def suitable(cls, url):
return False if FrontEndMasterIE.suitable(url) else super(FrontEndMasterBaseIE, cls).suitable(url)
def _real_extract(self, url):
mobj = re.match(self._VALID_URL, url)
course_id = mobj.group('courseid')
course_json_content = self._download_course(course_id=course_id,
url=url)
title = course_json_content.get('title')
description = course_json_content.get('description')
course_display_id = course_json_content.get('slug')
videos_data = course_json_content.get('lessonData').values()
videos_data = sorted(videos_data, key=lambda video: video.get('index'))
entries = []
for video in videos_data:
video_slug = video.get('slug')
clip_url = '%s/%s/%s' % (
self._VIDEO_BASE, course_display_id, video_slug)
entries.append({
'_type': 'url_transparent',
'url': clip_url,
'ie_key': FrontEndMasterIE.ie_key()
})
return self.playlist_result(entries, course_id, title, description)