From 3a105f7b20e8a3f742ac86cc1a6b02935b831778 Mon Sep 17 00:00:00 2001 From: Yen Chi Hsuan Date: Fri, 15 May 2015 02:17:22 +0800 Subject: [PATCH] [teamcoco] Rewrite preload data extraction Idea: "puncture" some consecutive fragments and check whether the b64decode result of a punctured string is a valid JSON or not. It's a O(N^3) algorithm, but should be fast for a small N (less than 30 fragments in all test cases) --- youtube_dl/extractor/teamcoco.py | 53 ++++++++++++++++---------------- 1 file changed, 26 insertions(+), 27 deletions(-) diff --git a/youtube_dl/extractor/teamcoco.py b/youtube_dl/extractor/teamcoco.py index 95d58ddd0..410eb7d3a 100644 --- a/youtube_dl/extractor/teamcoco.py +++ b/youtube_dl/extractor/teamcoco.py @@ -4,6 +4,7 @@ from __future__ import unicode_literals import base64 import binascii import re +import json from .common import InfoExtractor from ..utils import ( @@ -68,41 +69,39 @@ class TeamcocoIE(InfoExtractor): video_id = self._html_search_regex( self._VIDEO_ID_REGEXES, webpage, 'video id') - data = preload = None - preloads = re.findall(r'"preload":\s*"([^"]+)"', webpage) - if preloads: - preload = max([(len(p), p) for p in preloads])[1] + data = None - if not preload: - preload = ''.join(re.findall(r'this\.push\("([^"]+)"\);', webpage)) + preload_codes = self._html_search_regex( + r'(function.+)setTimeout\(function\(\)\{playlist', + webpage, 'preload codes') + base64_fragments = re.findall(r'"([a-zA-z0-9+/=]+)"', preload_codes) + base64_fragments.remove('init') - if not preload: - preload = self._html_search_regex([ - r'player,\[?"([^"]+)"\]?', r'player.init\(\[?"([^"]+)"\]?\)' - ], webpage.replace('","', ''), 'preload data', default=None) - - if not preload: - preload_codes = self._html_search_regex( - r'(function.+)setTimeout\(function\(\)\{playlist', - webpage, 'preload codes') - base64_fragments = re.findall(r'"([a-zA-z0-9+/=]+)"', preload_codes) - base64_fragments.remove('init') - for i in range(len(base64_fragments)): - cur_sequence = (''.join(base64_fragments[i:] + base64_fragments[:i])).encode('ascii') + def _check_sequence(cur_fragments): + if not cur_fragments: + return + for i in range(len(cur_fragments)): + cur_sequence = (''.join(cur_fragments[i:] + cur_fragments[:i])).encode('ascii') try: raw_data = base64.b64decode(cur_sequence) - except (TypeError, binascii.Error): + if compat_ord(raw_data[0]) == compat_ord('{'): + return json.loads(raw_data.decode('utf-8')) + except (TypeError, binascii.Error, UnicodeDecodeError, ValueError): continue - if compat_ord(raw_data[0]) == compat_ord('{'): - data = self._parse_json(raw_data.decode('utf-8'), video_id, fatal=False) - if not preload and not data: - raise ExtractorError( - 'Preload information could not be extracted', expected=True) + def _check_data(): + for i in range(len(base64_fragments) + 1): + for j in range(i, len(base64_fragments) + 1): + data = _check_sequence(base64_fragments[:i] + base64_fragments[j:]) + if data: + return data + + self.to_screen('Try to compute possible data sequence. This may take some time.') + data = _check_data() if not data: - data = self._parse_json( - base64.b64decode(preload.encode('ascii')).decode('utf-8'), video_id) + raise ExtractorError( + 'Preload information could not be extracted', expected=True) formats = [] get_quality = qualities(['500k', '480p', '1000k', '720p', '1080p'])