146 lines
6.3 KiB
Python
146 lines
6.3 KiB
Python
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import base64
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import json
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from youtube import proto, util, yt_data_extract
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from youtube.util import concat_or_none
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# Here's what I know about the secret key (starting with ASJN_i)
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# *The secret key definitely contains the following information (or perhaps the information is stored at youtube's servers):
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# -Video id
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# -Offset
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# -Sort
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# *If the video id or sort in the ctoken contradicts the ASJN, the response is an error. The offset encoded outside the ASJN is ignored entirely.
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# *The ASJN is base64 encoded data, indicated by the fact that the character after "ASJN_i" is one of ("0", "1", "2", "3")
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# *The encoded data is not valid protobuf
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# *The encoded data (after the 5 or so bytes that are always the same) is indistinguishable from random data according to a battery of randomness tests
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# *The ASJN in the ctoken provided by a response changes in regular intervals of about a second or two.
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# *Old ASJN's continue to work, and start at the same comment even if new comments have been posted since
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# *The ASJN has no relation with any of the data in the response it came from
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def make_comment_ctoken(video_id, sort=0, offset=0, lc='', secret_key=''):
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video_id = proto.as_bytes(video_id)
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secret_key = proto.as_bytes(secret_key)
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page_info = proto.string(4,video_id) + proto.uint(6, sort)
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offset_information = proto.nested(4, page_info) + proto.uint(5, offset)
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if secret_key:
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offset_information = proto.string(1, secret_key) + offset_information
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page_params = proto.string(2, video_id)
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if lc:
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page_params += proto.string(6, proto.percent_b64encode(proto.string(15, lc)))
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result = proto.nested(2, page_params) + proto.uint(3,6) + proto.nested(6, offset_information)
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return base64.urlsafe_b64encode(result).decode('ascii')
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def comment_replies_ctoken(video_id, comment_id, max_results=500):
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params = proto.string(2, comment_id) + proto.uint(9, max_results)
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params = proto.nested(3, params)
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result = proto.nested(2, proto.string(2, video_id)) + proto.uint(3,6) + proto.nested(6, params)
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return base64.urlsafe_b64encode(result).decode('ascii')
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mobile_headers = {
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'User-Agent': 'Mozilla/5.0 (iPhone; CPU iPhone OS 10_3_1 like Mac OS X) AppleWebKit/603.1.30 (KHTML, like Gecko) Version/10.0 Mobile/14E304 Safari/602.1',
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'Accept': '*/*',
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'Accept-Language': 'en-US,en;q=0.5',
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'X-YouTube-Client-Name': '2',
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'X-YouTube-Client-Version': '2.20180823',
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}
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def request_comments(ctoken, replies=False):
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if replies: # let's make it use different urls for no reason despite all the data being encoded
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base_url = "https://m.youtube.com/watch_comment?action_get_comment_replies=1&ctoken="
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else:
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base_url = "https://m.youtube.com/watch_comment?action_get_comments=1&ctoken="
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url = base_url + ctoken.replace("=", "%3D") + "&pbj=1"
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for i in range(0,8): # don't retry more than 8 times
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content = util.fetch_url(url, headers=mobile_headers, report_text="Retrieved comments", debug_name='request_comments')
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if content[0:4] == b")]}'": # random closing characters included at beginning of response for some reason
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content = content[4:]
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elif content[0:10] == b'\n<!DOCTYPE': # occasionally returns html instead of json for no reason
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content = b''
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print("got <!DOCTYPE>, retrying")
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continue
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break
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polymer_json = json.loads(util.uppercase_escape(content.decode('utf-8')))
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return polymer_json
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def single_comment_ctoken(video_id, comment_id):
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page_params = proto.string(2, video_id) + proto.string(6, proto.percent_b64encode(proto.string(15, comment_id)))
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result = proto.nested(2, page_params) + proto.uint(3,6)
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return base64.urlsafe_b64encode(result).decode('ascii')
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def post_process_comments_info(comments_info):
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for comment in comments_info['comments']:
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comment['author_url'] = concat_or_none(
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util.URL_ORIGIN, comment['author_url'])
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comment['author_avatar'] = concat_or_none(
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'/', comment['author_avatar'])
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comment['permalink'] = concat_or_none(util.URL_ORIGIN, '/watch?v=',
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comments_info['video_id'], '&lc=', comment['id'])
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reply_count = comment['reply_count']
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if reply_count == 0:
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comment['replies_url'] = concat_or_none(util.URL_ORIGIN,
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'/post_comment?parent_id=', comment['id'],
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'&video_id=', comments_info['video_id'])
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else:
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comment['replies_url'] = concat_or_none(util.URL_ORIGIN,
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'/comments?parent_id=', comment['id'],
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'&video_id=', comments_info['video_id'])
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if reply_count == 0:
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comment['view_replies_text'] = 'Reply'
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elif reply_count == 1:
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comment['view_replies_text'] = '1 reply'
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else:
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comment['view_replies_text'] = str(reply_count) + ' replies'
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if comment['like_count'] == 1:
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comment['likes_text'] = '1 like'
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else:
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comment['likes_text'] = str(comment['like_count']) + ' likes'
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if comments_info['ctoken']:
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comments_info['more_comments_url'] = concat_or_none(util.URL_ORIGIN,
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'/comments?ctoken=', comments_info['ctoken'])
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comments_info['page_number'] = page_number = str(int(comments_info['offset']/20) + 1)
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if not comments_info['is_replies']:
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comments_info['sort_text'] = 'top' if comments_info['sort'] == 0 else 'newest'
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comments_info['video_url'] = concat_or_none(util.URL_ORIGIN,
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'/watch?v=', comments_info['video_id'])
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comments_info['video_thumbnail'] = concat_or_none('/i.ytimg.com/vi/',
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comments_info['video_id'], '/mqdefault.jpg')
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def video_comments(video_id, sort=0, offset=0, lc='', secret_key=''):
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comments_info = yt_data_extract.extract_comments_info(request_comments(make_comment_ctoken(video_id, sort, offset, lc, secret_key)))
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post_process_comments_info(comments_info)
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post_comment_url = util.URL_ORIGIN + "/post_comment?video_id=" + video_id
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other_sort_url = util.URL_ORIGIN + '/comments?ctoken=' + make_comment_ctoken(video_id, sort=1 - sort, lc=lc)
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other_sort_text = 'Sort by ' + ('newest' if sort == 0 else 'top')
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comments_info['comment_links'] = [('Post comment', post_comment_url), (other_sort_text, other_sort_url)]
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return comments_info
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return {}
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