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[bandcamp] Fix free downloads extraction and extract all formats (closes #11067)

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Sergey M․ 2016-11-19 04:18:21 +07:00
parent 08ec95a6db
commit 0aacd2deb1
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1 changed files with 62 additions and 24 deletions
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86
youtube_dl/extractor/bandcamp.py
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@ -1,7 +1,9 @@
from __future__ import unicode_literals
import json
import random
import re
import time
from .common import InfoExtractor
from ..compat import (
@ -12,6 +14,9 @@ from ..utils import (
ExtractorError,
float_or_none,
int_or_none,
parse_filesize,
unescapeHTML,
update_url_query,
)
@ -81,35 +86,68 @@ class BandcampIE(InfoExtractor):
r'(?ms)var TralbumData = .*?[{,]\s*id: (?P<id>\d+),?$',
webpage, 'video id')
download_webpage = self._download_webpage(download_link, video_id, 'Downloading free downloads page')
# We get the dictionary of the track from some javascript code
all_info = self._parse_json(self._search_regex(
r'(?sm)items: (.*?),$', download_webpage, 'items'), video_id)
info = all_info[0]
# We pick mp3-320 for now, until format selection can be easily implemented.
mp3_info = info['downloads']['mp3-320']
# If we try to use this url it says the link has expired
initial_url = mp3_info['url']
m_url = re.match(
r'(?P<server>http://(.*?)\.bandcamp\.com)/download/track\?enc=mp3-320&fsig=(?P<fsig>.*?)&id=(?P<id>.*?)&ts=(?P<ts>.*)$',
initial_url)
# We build the url we will use to get the final track url
# This url is build in Bandcamp in the script download_bunde_*.js
request_url = '%s/statdownload/track?enc=mp3-320&fsig=%s&id=%s&ts=%s&.rand=665028774616&.vrs=1' % (m_url.group('server'), m_url.group('fsig'), video_id, m_url.group('ts'))
final_url_webpage = self._download_webpage(request_url, video_id, 'Requesting download url')
# If we could correctly generate the .rand field the url would be
# in the "download_url" key
final_url = self._proto_relative_url(self._search_regex(
r'"retry_url":"(.+?)"', final_url_webpage, 'final video URL'), 'http:')
download_webpage = self._download_webpage(
download_link, video_id, 'Downloading free downloads page')
blob = self._parse_json(
self._search_regex(
r'data-blob=(["\'])(?P<blob>{.+?})\1', download_webpage,
'blob', group='blob'),
video_id, transform_source=unescapeHTML)
info = blob['digital_items'][0]
downloads = info['downloads']
track = info['title']
artist = info.get('artist')
title = '%s - %s' % (artist, track) if artist else track
download_formats = {}
for f in blob['download_formats']:
name, ext = f.get('name'), f.get('file_extension')
if all(isinstance(x, compat_str) for x in (name, ext)):
download_formats[name] = ext.strip('.')
formats = []
for format_id, f in downloads.items():
format_url = f.get('url')
if not format_url:
continue
# Stat URL generation algorithm is reverse engineered from
# download_*_bundle_*.js
stat_url = update_url_query(
format_url.replace('/download/', '/statdownload/'), {
'.rand': int(time.time() * 1000 * random.random()),
})
format_id = f.get('encoding_name') or format_id
stat = self._download_json(
stat_url, video_id, 'Downloading %s JSON' % format_id,
transform_source=lambda s: s[s.index('{'):s.rindex('}') + 1],
fatal=False)
if not stat:
continue
retry_url = stat.get('retry_url')
if not isinstance(retry_url, compat_str):
continue
formats.append({
'url': self._proto_relative_url(retry_url, 'http:'),
'ext': download_formats.get(format_id),
'format_id': format_id,
'format_note': f.get('description'),
'filesize': parse_filesize(f.get('size_mb')),
'vcodec': 'none',
})
self._sort_formats(formats)
return {
'id': video_id,
'title': info['title'],
'ext': 'mp3',
'vcodec': 'none',
'url': final_url,
'title': title,
'thumbnail': info.get('thumb_url'),
'uploader': info.get('artist'),
'artist': artist,
'track': track,
'formats': formats,
}