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('''
$author
$text $replies
''') reply_link_template = Template(''' View replies ''') with open("yt_comments_template.html", "r") as file: yt_comments_template = Template(file.read()) # $replies_link_text # 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') def comment_replies_ctoken(video_id, comment_id, max_results=500): params = proto.string(2, comment_id) + proto.uint(9, max_results) params = proto.nested(3, params) result = proto.nested(2, proto.string(2, video_id)) + proto.uint(3,6) + proto.nested(6, params) return base64.urlsafe_b64encode(result).decode('ascii') def get_ids(ctoken): params = proto.parse(proto.b64_to_bytes(ctoken)) video_id = proto.parse(params[2])[2] params = proto.parse(params[6]) params = proto.parse(params[3]) return params[2].decode('ascii'), video_id.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, retrying") continue break '''with open('debug/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'] comment_id, video_id = get_ids(ctoken) replies_url = URL_ORIGIN + '/comments?parent_id=' + comment_id + "&video_id=" + video_id 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('''More comments''') def get_comments_page(query_string): parameters = urllib.parse.parse_qs(query_string) ctoken = default_multi_get(parameters, 'ctoken', 0, default='') if not ctoken: video_id = parameters['video_id'][0] parent_id = parameters['parent_id'][0] ctoken = comment_replies_ctoken(video_id, parent_id) replies = True 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, )