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import re
import json
from html.parser import HTMLParser
import requests
YOUTUBE_BASE_URL = "https://www.youtube.com/"
BIND_URL = YOUTUBE_BASE_URL + "api/lounge/bc/bind"
LOUNGE_TOKEN_URL = YOUTUBE_BASE_URL + "api/lounge/pairing/get_lounge_token_batch"
QUEUE_AJAX_URL = YOUTUBE_BASE_URL + "watch_queue_ajax"
HEADERS = {"Origin": YOUTUBE_BASE_URL, "Content-Type": "application/x-www-form-urlencoded"}
LOUNGE_ID_HEADER = "X-YouTube-LoungeId-Token"
REQ_PREFIX = "req{req_id}"
WATCH_QUEUE_ITEM_CLASS = 'yt-uix-scroller-scroll-unit watch-queue-item'
GSESSION_ID_REGEX = '"S","(.*?)"]'
SID_REGEX = '"c","(.*?)",\"'
CURRENT_INDEX = "_currentIndex"
CURRENT_TIME = "_currentTime"
AUDIO_ONLY = "_audioOnly"
VIDEO_ID = "_videoId"
LIST_ID = "_listId"
ACTION = "__sc"
COUNT = "count"
ACTION_SET_PLAYLIST = "setPlaylist"
ACTION_CLEAR = "clearPlaylist"
ACTION_REMOVE = "removeVideo"
ACTION_INSERT = "insertVideo"
ACTION_ADD = "addVideo"
ACTION_GET_QUEUE_ITEMS = "action_get_watch_queue_items"
GSESSIONID = "gsessionid"
LOUNGEIDTOKEN = "loungeIdToken"
CVER = "CVER"
TYPE = "TYPE"
RID = "RID"
SID = "SID"
VER = "VER"
AID = "AID"
CI = "CI"
BIND_DATA = {"device": "REMOTE_CONTROL", "id": "aaaaaaaaaaaaaaaaaaaaaaaaaa", "name": "Python",
"mdx-version": 3, "pairing_type": "cast", "app": "android-phone-13.14.55"}
class QueueHTMLParser(HTMLParser):
def __init__(self):
self.queue_items = []
super().__init__()
def handle_starttag(self, tag, attrs):
if tag == "li":
attributes = dict((x, y) for x, y in attrs)
if 'class' in attributes.keys():
if attributes['class'] == WATCH_QUEUE_ITEM_CLASS:
self.queue_items.append(attributes)
class YouTubeSession(object):
""" The main logic to interact with YouTube cast api."""
def __init__(self, screen_id):
self._screen_id = screen_id
self._lounge_token = None
self._gsession_id = None
self._sid = None
self._rid = 0
self._req_count = 0
@property
def in_session(self):
""" Returns True if session params are not None."""
if self._gsession_id and self._lounge_token:
return True
else:
return False
def play_video(self, video_id, list_id="", start_time="0"):
"""
Play video(video_id) now. This ignores the current play queue order.
:param video_id: YouTube video id(http://youtube.com/watch?v=video_id)
:param list_id: list id for playing playlist ...youtube.com/watch?v=VIDEO_ID&list=LIST_ID
:param start_time: starting time of the video in seconds
"""
# We always want to start a new session here to ensure an empty queue.
self._start_session()
self._initialize_queue(video_id, list_id, start_time)
def add_to_queue(self, video_id):
"""
Add video(video_id) to the end of the play queue.
:param video_id: YouTube video id(http://youtube.com/watch?v=video_id)
"""
self._queue_action(video_id, ACTION_ADD)
def play_next(self, video_id):
"""
Play video(video_id) after the currently playing video.
:param video_id: YouTube video id(http://youtube.com/watch?v=video_id)
"""
self._queue_action(video_id, ACTION_INSERT)
def remove_video(self, video_id):
"""
Remove video(videoId) from the queue.
:param video_id: YouTube video id(http://youtube.com/watch?v=video_id)
"""
self._queue_action(video_id, ACTION_REMOVE)
def clear_playlist(self):
self._queue_action('', ACTION_CLEAR)
def get_session_data(self):
"""
Get data about the current active session using an xmlhttp request.
:return: List of session attributes
"""
url_params = {LOUNGEIDTOKEN: self._lounge_token, VER: 8, "v": 2, RID: "rpc", SID: self._sid,
GSESSIONID: self._gsession_id, TYPE: "xmlhttp", "t": 1, AID: 5, CI: 1}
url_params.update(BIND_DATA)
response = self._do_post(BIND_URL, headers={LOUNGE_ID_HEADER: self._lounge_token},
session_request=True, params=url_params)
response_text = response.text
response_text = response_text.replace("\n", "")
response_list = json.loads(response_text[response_text.find("["):])
response_list = [v for k, v in response_list]
return response_list
def get_queue_playlist_id(self):
"""
Get the current queue playlist id.
:return: queue playlist id or None
"""
session_data = self.get_session_data()
for v in session_data:
if v[0] == "nowPlaying":
if v[1]["listId"]:
return v[1]["listId"]
return None
def get_queue_videos(self):
"""
Get the video id, video title and uploader username for videos currently in the queue.
:return: index, video id, title, username or {} if no active playlist id is found for the session
"""
queue_playlist_id = self.get_queue_playlist_id()
if not queue_playlist_id:
return {}
url_params = {ACTION_GET_QUEUE_ITEMS: 1, "list": queue_playlist_id}
response = self._do_post(QUEUE_AJAX_URL, headers={LOUNGE_ID_HEADER: self._lounge_token},
session_request=False, params=url_params)
parser = QueueHTMLParser()
parser.feed(response.json()['html'])
return parser.queue_items
def _start_session(self):
self._get_lounge_id()
self._bind()
def _get_lounge_id(self):
"""
Get the lounge_token.
The token is used as a header in all session requests.
"""
data = {"screen_ids": self._screen_id}
response = self._do_post(LOUNGE_TOKEN_URL, data=data)
lounge_token = response.json()["screens"][0]["loungeToken"]
self._lounge_token = lounge_token
def _bind(self):
"""
Bind to the app and get SID, gsessionid session identifiers.
If the chromecast is already in another YouTube session you should get
the SID, gsessionid for that session.
SID, gsessionid are used as url params in all further session requests.
"""
# reset session counters before starting a new session
self._rid = 0
self._req_count = 0
url_params = {RID: self._rid, VER: 8, CVER: 1}
headers = {LOUNGE_ID_HEADER: self._lounge_token}
response = self._do_post(BIND_URL, data=BIND_DATA, headers=headers,
params=url_params)
content = str(response.content)
sid = re.search(SID_REGEX, content)
gsessionid = re.search(GSESSION_ID_REGEX, content)
self._sid = sid.group(1)
self._gsession_id = gsessionid.group(1)
def _initialize_queue(self, video_id, list_id="", start_time="0"):
"""
Initialize a queue with a video and start playing that video.
"""
request_data = {LIST_ID: list_id,
ACTION: ACTION_SET_PLAYLIST,
CURRENT_TIME: start_time,
CURRENT_INDEX: -1,
AUDIO_ONLY: "false",
VIDEO_ID: video_id,
COUNT: 1, }
request_data = self._format_session_params(request_data)
url_params = {SID: self._sid, GSESSIONID: self._gsession_id,
RID: self._rid, VER: 8, CVER: 1}
self._do_post(BIND_URL, data=request_data, headers={LOUNGE_ID_HEADER: self._lounge_token},
session_request=True, params=url_params)
def _queue_action(self, video_id, action):
"""
Sends actions for an established queue.
:param video_id: id to perform the action on
:param action: the action to perform
"""
# If nothing is playing actions will work but won"t affect the queue.
# This is for binding existing sessions
if not self.in_session:
self._start_session()
else:
# There is a bug that causes session to get out of sync after about 30 seconds. Binding again works.
# Binding for each session request has a pretty big performance impact
self._bind()
request_data = {ACTION: action,
VIDEO_ID: video_id,
COUNT: 1}
request_data = self._format_session_params(request_data)
url_params = {SID: self._sid, GSESSIONID: self._gsession_id, RID: self._rid, VER: 8, CVER: 1}
self._do_post(BIND_URL, data=request_data, headers={LOUNGE_ID_HEADER: self._lounge_token},
session_request=True, params=url_params)
def _format_session_params(self, param_dict):
req_count = REQ_PREFIX.format(req_id=self._req_count)
return {req_count + k if k.startswith("_") else k: v for k, v in param_dict.items()}
def _do_post(self, url, data=None, params=None, headers=None, session_request=False):
"""
Calls requests.post with custom headers,
increments RID(request id) on every post.
will raise if response is not 200
:param url:(str) request url
:param data: (dict) the POST body
:param params:(dict) POST url params
:param headers:(dict) Additional headers for the request
:param session_request:(bool) True to increment session
request counter(req_count)
:return: POST response
"""
if headers:
headers = dict(**dict(HEADERS, **headers))
else:
headers = HEADERS
response = requests.post(url, headers=headers, data=data, params=params)
# 404 resets the sid, session counters
# 400 in session probably means bad sid
# If user did a bad request (eg. remove an non-existing video from queue) bind restores the session.
if (response.status_code == 404 or response.status_code == 400) and session_request:
self._bind()
response.raise_for_status()
if session_request:
self._req_count += 1
self._rid += 1
return response
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