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zeroconf.py
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zeroconf.py
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from __future__ import annotations
from Cryptodome.Cipher import AES
from Cryptodome.Hash import HMAC, SHA1
from Cryptodome.Util import Counter
from librespot import util, Version
from librespot.core import Session
from librespot.crypto import DiffieHellman
from librespot.proto import Connect_pb2 as Connect
from librespot.structure import Closeable, Runnable, SessionListener
import base64
import concurrent.futures
import copy
import io
import json
import logging
import random
import socket
import threading
import typing
import urllib.parse
import zeroconf
class ZeroconfServer(Closeable):
logger = logging.getLogger("Librespot:ZeroconfServer")
service = "_spotify-connect._tcp.local."
__connecting_username: typing.Union[str, None] = None
__connection_lock = threading.Condition()
__default_get_info_fields = {
"status": 101,
"statusString": "OK",
"spotifyError": 0,
"version": "2.7.1",
"libraryVersion": Version.version_name,
"accountReq": "PREMIUM",
"brandDisplayName": "kokarare1212",
"modelDisplayName": "librespot-python",
"voiceSupport": "NO",
"availability": "",
"productID": 0,
"tokenType": "default",
"groupStatus": "NONE",
"resolverVersion": "0",
"scope": "streaming,client-authorization-universal",
}
__default_successful_add_user = {
"status": 101,
"spotifyError": 0,
"statusString": "OK",
}
__eol = b"\r\n"
__max_port = 65536
__min_port = 1024
__runner: HttpRunner
__service_info: zeroconf.ServiceInfo
__session: typing.Union[Session, None] = None
__session_listeners: typing.List[SessionListener] = []
__zeroconf: zeroconf.Zeroconf
def __init__(self, inner: Inner, listen_port):
self.__inner = inner
self.__keys = DiffieHellman()
if listen_port == -1:
listen_port = random.randint(self.__min_port + 1, self.__max_port)
self.__runner = ZeroconfServer.HttpRunner(self, listen_port)
threading.Thread(target=self.__runner.run,
name="zeroconf-http-server").start()
self.__zeroconf = zeroconf.Zeroconf()
self.__service_info = zeroconf.ServiceInfo(
ZeroconfServer.service,
inner.device_name + "." + ZeroconfServer.service,
listen_port,
0,
0, {
"CPath": "/",
"VERSION": "1.0",
"STACK": "SP",
},
self.get_useful_hostname() + ".",
addresses=[
socket.inet_aton(
socket.gethostbyname(self.get_useful_hostname()))
])
self.__zeroconf.register_service(self.__service_info)
threading.Thread(target=self.__zeroconf.start,
name="zeroconf-multicast-dns-server").start()
def add_session_listener(self, listener: ZeroconfServer):
self.__session_listeners.append(listener)
def close(self) -> None:
self.__zeroconf.close()
self.__runner.close()
def close_session(self) -> None:
if self.__session is None:
return
for session_listener in self.__session_listeners:
session_listener.session_closing(self.__session)
self.__session.close()
self.__session = None
def get_useful_hostname(self) -> str:
host = socket.gethostname()
if host == "localhost":
pass
else:
return host
def handle_add_user(self, __socket: socket.socket, params: dict[str, str],
http_version: str) -> None:
username = params.get("userName")
if not username:
self.logger.error("Missing userName!")
return
blob_str = params.get("blob")
if not blob_str:
self.logger.error("Missing blob!")
return
client_key_str = params.get("clientKey")
if not client_key_str:
self.logger.error("Missing clientKey!")
with self.__connection_lock:
if username == self.__connecting_username:
self.logger.info(
"{} is already trying to connect.".format(username))
__socket.send(http_version.encode())
__socket.send(b" 403 Forbidden")
__socket.send(self.__eol)
__socket.send(self.__eol)
return
shared_key = util.int_to_bytes(
self.__keys.compute_shared_key(
base64.b64decode(client_key_str.encode())))
blob_bytes = base64.b64decode(blob_str)
iv = blob_bytes[:16]
encrypted = blob_bytes[16:len(blob_bytes) - 20]
checksum = blob_bytes[len(blob_bytes) - 20:]
sha1 = SHA1.new()
sha1.update(shared_key)
base_key = sha1.digest()[:16]
hmac = HMAC.new(base_key, digestmod=SHA1)
hmac.update(b"checksum")
checksum_key = hmac.digest()
hmac = HMAC.new(base_key, digestmod=SHA1)
hmac.update(b"encryption")
encryption_key = hmac.digest()
hmac = HMAC.new(checksum_key, digestmod=SHA1)
hmac.update(encrypted)
mac = hmac.digest()
if mac != checksum:
self.logger.error("Mac and checksum don't match!")
__socket.send(http_version.encode())
__socket.send(b" 400 Bad Request")
__socket.send(self.__eol)
__socket.send(self.__eol)
return
aes = AES.new(encryption_key[:16],
AES.MODE_CTR,
counter=Counter.new(128,
initial_value=int.from_bytes(
iv, "big")))
decrypted = aes.decrypt(encrypted)
self.close_session()
with self.__connection_lock:
self.__connecting_username = username
self.logger.info("Accepted new user from {}. [deviceId: {}]".format(
params.get("deviceName"), self.__inner.device_id))
response = json.dumps(self.__default_successful_add_user)
__socket.send(http_version.encode())
__socket.send(b" 200 OK")
__socket.send(self.__eol)
__socket.send(b"Content-Length: ")
__socket.send(str(len(response)).encode())
__socket.send(self.__eol)
__socket.send(self.__eol)
__socket.send(response.encode())
self.__session = Session.Builder(self.__inner.conf) \
.set_device_id(self.__inner.device_id) \
.set_device_name(self.__inner.device_name) \
.set_device_type(self.__inner.device_type) \
.set_preferred_locale(self.__inner.preferred_locale) \
.blob(username, decrypted) \
.create()
with self.__connection_lock:
self.__connecting_username = None
for session_listener in self.__session_listeners:
session_listener.session_changed(self.__session)
def handle_get_info(self, __socket: socket.socket,
http_version: str) -> None:
info = copy.deepcopy(self.__default_get_info_fields)
info["deviceID"] = self.__inner.device_id
info["remoteName"] = self.__inner.device_name
info["publicKey"] = base64.b64encode(
self.__keys.public_key_bytes()).decode()
info["deviceType"] = Connect.DeviceType.Name(self.__inner.device_type)
with self.__connection_lock:
info[
"activeUser"] = self.__connecting_username if self.__connecting_username is not None else self.__session.username(
) if self.has_valid_session() else ""
__socket.send(http_version.encode())
__socket.send(b" 200 OK")
__socket.send(self.__eol)
__socket.send(b"Content-Type: application/json")
__socket.send(self.__eol)
__socket.send(self.__eol)
__socket.send(json.dumps(info).encode())
def has_valid_session(self) -> bool:
valid = self.__session and self.__session.is_valid()
if not valid:
self.__session = None
return valid
def parse_path(self, path: str) -> dict[str, str]:
url = "https://host" + path
parsed = {}
params = urllib.parse.parse_qs(urllib.parse.urlparse(url).query)
for key, values in params.items():
for value in values:
parsed[key] = value
return parsed
def remove_session_listener(self, listener: SessionListener):
self.__session_listeners.remove(listener)
class Builder(Session.Builder):
listen_port: int = -1
def set_listen_port(self, listen_port: int):
self.listen_port = listen_port
return self
def create(self) -> ZeroconfServer:
return ZeroconfServer(
ZeroconfServer.Inner(self.device_type, self.device_name,
self.device_id, self.preferred_locale,
self.conf), self.listen_port)
class HttpRunner(Closeable, Runnable):
__should_stop = False
__socket: socket.socket
__worker = concurrent.futures.ThreadPoolExecutor()
__zeroconf_server: ZeroconfServer
def __init__(self, zeroconf_server: ZeroconfServer, port: int):
self.__socket = socket.socket()
self.__socket.bind((".".join(["0"] * 4), port))
self.__socket.listen(5)
self.__zeroconf_server = zeroconf_server
self.__zeroconf_server.logger.info(
"Zeroconf HTTP server started successfully on port {}!".format(
port))
def close(self) -> None:
pass
def run(self):
while not self.__should_stop:
__socket, address = self.__socket.accept()
def anonymous():
self.__handle(__socket)
__socket.close()
self.__worker.submit(anonymous)
def __handle(self, __socket: socket.socket) -> None:
request = io.BytesIO(__socket.recv(1024 * 1024))
request_line = request.readline().strip().split(b" ")
if len(request_line) != 3:
self.__zeroconf_server.logger.warning(
"Unexpected request line: {}".format(request_line))
method = request_line[0].decode()
path = request_line[1].decode()
http_version = request_line[2].decode()
headers = {}
while True:
header = request.readline().strip()
if not header:
break
split = header.split(b":")
headers[split[0].decode()] = split[1].strip().decode()
if not self.__zeroconf_server.has_valid_session():
self.__zeroconf_server.logger.debug(
"Handling request: {}, {}, {}, headers: {}".format(
method, path, http_version, headers))
params = {}
if method == "POST":
content_type = headers.get("Content-Type")
if content_type != "application/x-www-form-urlencoded":
self.__zeroconf_server.logger.error(
"Bad Content-Type: {}".format(content_type))
return
content_length_str = headers.get("Content-Length")
if content_length_str is None:
self.__zeroconf_server.logger.error(
"Missing Content-Length header!")
return
content_length = int(content_length_str)
body = request.read(content_length).decode()
pairs = body.split("&")
for pair in pairs:
split = pair.split("=")
params[urllib.parse.unquote(
split[0])] = urllib.parse.unquote(split[1])
else:
params = self.__zeroconf_server.parse_path(path)
action = params.get("action")
if action is None:
self.__zeroconf_server.logger.debug(
"Request is missing action.")
return
self.handle_request(__socket, http_version, action, params)
def handle_request(self, __socket: socket.socket, http_version: str,
action: str, params: dict[str, str]) -> None:
if action == "addUser":
if params is None:
raise RuntimeError
self.__zeroconf_server.handle_add_user(__socket, params,
http_version)
elif action == "getInfo":
self.__zeroconf_server.handle_get_info(__socket, http_version)
else:
self.__zeroconf_server.logger.warning(
"Unknown action: {}".format(action))
class Inner:
conf: typing.Final[Session.Configuration]
device_name: typing.Final[str]
device_id: typing.Final[str]
device_type: typing.Final[Connect.DeviceType]
preferred_locale: typing.Final[str]
def __init__(self, device_type: Connect.DeviceType, device_name: str,
device_id: str, preferred_locale: str,
conf: Session.Configuration):
self.conf = conf
self.device_name = device_name
self.device_id = util.random_hex_string(
40).lower() if not device_id else device_id
self.device_type = device_type
self.preferred_locale = preferred_locale