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import json
import youtube.proto as proto
import base64
from youtube.common import uppercase_escape, default_multi_get, format_text_runs, URL_ORIGIN, fetch_url
from string import Template
import urllib.request
import urllib
import html
comment_template = Template('''
<div class="comment-container">
<div class="comment">
<a class="author-avatar" href="$author_url" title="$author">
<img class="author-avatar-img" src="$author_avatar">
</a>
<address>
<a class="author" href="$author_url" title="$author">$author</a>
</address>
<span class="text">$text</span>
<time datetime="$datetime">$published</time>
<span class="likes">$likes</span>
$replies
</div>
</div>
''')
reply_link_template = Template('''
<a href="$url" class="replies">View replies</a>
''')
with open("yt_comments_template.html", "r") as file:
yt_comments_template = Template(file.read())
# <a class="replies-link" href="$replies_url">$replies_link_text</a>
# Here's what I know about the secret key (starting with ASJN_i)
# *The secret key definitely contains the following information (or perhaps the information is stored at youtube's servers):
# -Video id
# -Offset
# -Sort
# *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.
# *The ASJN is base64 encoded data, indicated by the fact that the character after "ASJN_i" is one of ("0", "1", "2", "3")
# *The encoded data is not valid protobuf
# *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
# *The ASJN in the ctoken provided by a response changes in regular intervals of about a second or two.
# *Old ASJN's continue to work, and start at the same comment even if new comments have been posted since
# *The ASJN has no relation with any of the data in the response it came from
def make_comment_ctoken(video_id, sort=0, offset=0, secret_key=''):
video_id = proto.as_bytes(video_id)
secret_key = proto.as_bytes(secret_key)
page_info = proto.string(4,video_id) + proto.uint(6, sort)
offset_information = proto.nested(4, page_info) + proto.uint(5, offset)
if secret_key:
offset_information = proto.string(1, secret_key) + offset_information
result = proto.nested(2, proto.string(2, video_id)) + proto.uint(3,6) + proto.nested(6, offset_information)
return base64.urlsafe_b64encode(result).decode('ascii')
mobile_headers = {
'Host': 'm.youtube.com',
'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',
'Accept': '*/*',
'Accept-Language': 'en-US,en;q=0.5',
'X-YouTube-Client-Name': '2',
'X-YouTube-Client-Version': '1.20180613',
}
def request_comments(ctoken, replies=False):
if replies: # let's make it use different urls for no reason despite all the data being encoded
base_url = "https://m.youtube.com/watch_comment?action_get_comment_replies=1&ctoken="
else:
base_url = "https://m.youtube.com/watch_comment?action_get_comments=1&ctoken="
url = base_url + ctoken.replace("=", "%3D") + "&pbj=1"
print("Sending comments ajax request")
for i in range(0,8): # don't retry more than 8 times
content = fetch_url(url, headers=mobile_headers)
if content[0:4] == b")]}'": # random closing characters included at beginning of response for some reason
content = content[4:]
elif content[0:10] == b'\n<!DOCTYPE': # occasionally returns html instead of json for no reason
content = b''
print("got <!DOCTYPE>, retrying")
continue
break
'''with open('comments_debug', 'wb') as f:
f.write(content)'''
return content
def parse_comments(content, replies=False):
try:
content = json.loads(uppercase_escape(content.decode('utf-8')))
#print(content)
comments_raw = content['content']['continuation_contents']['contents']
ctoken = default_multi_get(content, 'content', 'continuation_contents', 'continuations', 0, 'continuation', default='')
comments = []
for comment_raw in comments_raw:
replies_url = ''
if not replies:
if comment_raw['replies'] is not None:
ctoken = comment_raw['replies']['continuations'][0]['continuation']
replies_url = URL_ORIGIN + '/comments?ctoken=' + ctoken + "&replies=1"
comment_raw = comment_raw['comment']
comment = {
'author': comment_raw['author']['runs'][0]['text'],
'author_url': comment_raw['author_endpoint']['url'],
'author_avatar': comment_raw['author_thumbnail']['url'],
'likes': comment_raw['like_count'],
'published': comment_raw['published_time']['runs'][0]['text'],
'text': comment_raw['content']['runs'],
'reply_count': '',
'replies_url': replies_url,
}
comments.append(comment)
except Exception as e:
print('Error parsing comments: ' + str(e))
comments = ()
ctoken = ''
else:
print("Finished getting and parsing comments")
return {'ctoken': ctoken, 'comments': comments}
def get_comments_html(result):
html_result = ''
for comment in result['comments']:
replies = ''
if comment['replies_url']:
replies = reply_link_template.substitute(url=comment['replies_url'])
html_result += comment_template.substitute(
author=html.escape(comment['author']),
author_url = URL_ORIGIN + comment['author_url'],
author_avatar = '/' + comment['author_avatar'],
likes = str(comment['likes']) + ' likes' if str(comment['likes']) != '0' else '',
published = comment['published'],
text = format_text_runs(comment['text']),
datetime = '', #TODO
replies=replies,
#replies='',
)
return html_result, result['ctoken']
def video_comments(video_id, sort=0, offset=0, secret_key=''):
result = parse_comments(request_comments(make_comment_ctoken(video_id, sort, offset, secret_key)))
return get_comments_html(result)
more_comments_template = Template('''<a class="page-button more-comments" href="$url">More comments</a>''')
def get_comments_page(query_string):
parameters = urllib.parse.parse_qs(query_string)
ctoken = parameters['ctoken'][0]
replies = default_multi_get(parameters, 'replies', 0, default="0") == "1"
result = parse_comments(request_comments(ctoken, replies), replies)
comments_html, ctoken = get_comments_html(result)
if ctoken == '':
more_comments_button = ''
else:
more_comments_button = more_comments_template.substitute(url = URL_ORIGIN + '/comments?ctoken=' + ctoken)
return yt_comments_template.substitute(
comments = comments_html,
page_title = 'Comments',
more_comments_button=more_comments_button,
)
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