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jellyfin-kodi/jellyfin_kodi/jellyfin/websocket.py

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from __future__ import division, absolute_import, print_function, unicode_literals
"""
websocket - WebSocket client library for Python
Copyright (C) 2010 Hiroki Ohtani(liris)
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
"""
import socket
try:
import ssl
from ssl import SSLError
HAVE_SSL = True
except ImportError:
# dummy class of SSLError for ssl none-support environment.
class SSLError(Exception):
pass
HAVE_SSL = False
import os
import sys
import array
import struct
import uuid
import hashlib
import base64
import threading
import time
import logging
from six import text_type, string_types, int2byte, indexbytes
from six.moves import range
from six.moves.urllib.parse import urlparse
"""
websocket python client.
=========================
This version support only hybi-13.
Please see http://tools.ietf.org/html/rfc6455 for protocol.
"""
# websocket supported version.
VERSION = 13
# closing frame status codes.
STATUS_NORMAL = 1000
STATUS_GOING_AWAY = 1001
STATUS_PROTOCOL_ERROR = 1002
STATUS_UNSUPPORTED_DATA_TYPE = 1003
STATUS_STATUS_NOT_AVAILABLE = 1005
STATUS_ABNORMAL_CLOSED = 1006
STATUS_INVALID_PAYLOAD = 1007
STATUS_POLICY_VIOLATION = 1008
STATUS_MESSAGE_TOO_BIG = 1009
STATUS_INVALID_EXTENSION = 1010
STATUS_UNEXPECTED_CONDITION = 1011
STATUS_TLS_HANDSHAKE_ERROR = 1015
logger = logging.getLogger()
class WebSocketException(Exception):
"""
websocket exeception class.
"""
pass
class WebSocketConnectionClosedException(WebSocketException):
"""
If remote host closed the connection or some network error happened,
this exception will be raised.
"""
pass
class WebSocketTimeoutException(WebSocketException):
"""
WebSocketTimeoutException will be raised at socket timeout during read/write data.
"""
pass
default_timeout = None
traceEnabled = False
def enableTrace(tracable):
"""
turn on/off the tracability.
tracable: boolean value. if set True, tracability is enabled.
"""
global traceEnabled
traceEnabled = tracable
if tracable:
if not logger.handlers:
logger.addHandler(logging.StreamHandler())
logger.setLevel(logging.DEBUG)
def setdefaulttimeout(timeout):
"""
Set the global timeout setting to connect.
timeout: default socket timeout time. This value is second.
"""
global default_timeout
default_timeout = timeout
def getdefaulttimeout():
"""
Return the global timeout setting(second) to connect.
"""
return default_timeout
def _wrap_sni_socket(sock, sslopt, hostname):
context = ssl.SSLContext(sslopt.get('ssl_version', ssl.PROTOCOL_TLS))
context.options |= ssl.OP_NO_SSLv2 # Explicitly disable SSLv2
context.options |= ssl.OP_NO_SSLv3 # Explicitly disable SSLv3
context.options |= ssl.OP_NO_TLSv1 # Explicitly disable TLSv1.0
context.options |= ssl.OP_NO_TLSv1_1 # Explicitly disable TLSv1.1
if sslopt.get('cert_reqs', ssl.CERT_NONE) != ssl.CERT_NONE:
capath = ssl.get_default_verify_paths().capath
context.load_verify_locations(
cafile=sslopt.get('ca_certs', None),
capath=sslopt.get('ca_cert_path', capath)
)
return context.wrap_socket(
sock,
do_handshake_on_connect=sslopt.get('do_handshake_on_connect', True),
suppress_ragged_eofs=sslopt.get('suppress_ragged_eofs', True),
server_hostname=hostname,
)
def _parse_url(url):
"""
parse url and the result is tuple of
(hostname, port, resource path and the flag of secure mode)
url: url string.
"""
if ":" not in url:
raise ValueError("url is invalid")
scheme, url = url.split(":", 1)
parsed = urlparse(url, scheme="http")
if parsed.hostname:
hostname = parsed.hostname
else:
raise ValueError("hostname is invalid")
port = 0
if parsed.port:
port = parsed.port
is_secure = False
if scheme == "ws":
if not port:
port = 80
elif scheme == "wss":
is_secure = True
if not port:
port = 443
else:
raise ValueError("scheme %s is invalid" % scheme)
if parsed.path:
resource = parsed.path
else:
resource = "/"
if parsed.query:
resource += "?" + parsed.query
return (hostname, port, resource, is_secure)
def create_connection(url, timeout=None, **options):
"""
connect to url and return websocket object.
Connect to url and return the WebSocket object.
Passing optional timeout parameter will set the timeout on the socket.
If no timeout is supplied, the global default timeout setting returned by getdefauttimeout() is used.
You can customize using 'options'.
If you set "header" list object, you can set your own custom header.
>>> conn = create_connection("ws://echo.websocket.org/",
... header=["User-Agent: MyProgram",
... "x-custom: header"])
timeout: socket timeout time. This value is integer.
if you set None for this value, it means "use default_timeout value"
options: current support option is only "header".
if you set header as dict value, the custom HTTP headers are added.
"""
sockopt = options.get("sockopt", [])
sslopt = options.get("sslopt", {})
websock = WebSocket(sockopt=sockopt, sslopt=sslopt)
websock.settimeout(timeout if timeout is not None else default_timeout)
websock.connect(url, **options)
return websock
_MAX_INTEGER = (1 << 32) - 1
_AVAILABLE_KEY_CHARS = list(range(0x21, 0x2f + 1)) + list(range(0x3a, 0x7e + 1))
_MAX_CHAR_BYTE = (1 << 8) - 1
# ref. Websocket gets an update, and it breaks stuff.
# http://axod.blogspot.com/2010/06/websocket-gets-update-and-it-breaks.html
def _create_sec_websocket_key():
uid = uuid.uuid4()
return base64.b64encode(uid.bytes).strip()
class ABNF(object):
"""
ABNF frame class.
see http://tools.ietf.org/html/rfc5234
and http://tools.ietf.org/html/rfc6455#section-5.2
"""
# operation code values.
OPCODE_CONT = 0x0
OPCODE_TEXT = 0x1
OPCODE_BINARY = 0x2
OPCODE_CLOSE = 0x8
OPCODE_PING = 0x9
OPCODE_PONG = 0xa
# available operation code value tuple
OPCODES = (OPCODE_CONT, OPCODE_TEXT, OPCODE_BINARY, OPCODE_CLOSE,
OPCODE_PING, OPCODE_PONG)
# opcode human readable string
OPCODE_MAP = {
OPCODE_CONT: "cont",
OPCODE_TEXT: "text",
OPCODE_BINARY: "binary",
OPCODE_CLOSE: "close",
OPCODE_PING: "ping",
OPCODE_PONG: "pong"
}
# data length threashold.
LENGTH_7 = 0x7d
LENGTH_16 = 1 << 16
LENGTH_63 = 1 << 63
def __init__(self, fin=0, rsv1=0, rsv2=0, rsv3=0,
opcode=OPCODE_TEXT, mask=1, data=""):
"""
Constructor for ABNF.
please check RFC for arguments.
"""
self.fin = fin
self.rsv1 = rsv1
self.rsv2 = rsv2
self.rsv3 = rsv3
self.opcode = opcode
self.mask = mask
self.data = data
self.get_mask_key = os.urandom
def __str__(self):
return "fin=" + str(self.fin) \
+ " opcode=" + str(self.opcode) \
+ " data=" + str(self.data)
@staticmethod
def create_frame(data, opcode):
"""
create frame to send text, binary and other data.
data: data to send. This is string value(byte array).
if opcode is OPCODE_TEXT and this value is uniocde,
data value is conveted into unicode string, automatically.
opcode: operation code. please see OPCODE_XXX.
"""
if opcode == ABNF.OPCODE_TEXT and isinstance(data, text_type):
data = data.encode("utf-8")
# mask must be set if send data from client
return ABNF(1, 0, 0, 0, opcode, 1, data)
def format(self):
"""
format this object to string(byte array) to send data to server.
"""
if any(x not in (0, 1) for x in [self.fin, self.rsv1, self.rsv2, self.rsv3]):
raise ValueError("not 0 or 1")
if self.opcode not in ABNF.OPCODES:
raise ValueError("Invalid OPCODE")
length = len(self.data)
if length >= ABNF.LENGTH_63:
raise ValueError("data is too long")
frame_header = int2byte(self.fin << 7 | self.rsv1 << 6 | self.rsv2 << 5 | self.rsv3 << 4 | self.opcode)
if length < ABNF.LENGTH_7:
frame_header += int2byte(self.mask << 7 | length)
elif length < ABNF.LENGTH_16:
frame_header += int2byte(self.mask << 7 | 0x7e)
frame_header += struct.pack("!H", length)
else:
frame_header += int2byte(self.mask << 7 | 0x7f)
frame_header += struct.pack("!Q", length)
if not self.mask:
return frame_header + self.data
else:
mask_key = self.get_mask_key(4)
return frame_header + self._get_masked(mask_key)
def _get_masked(self, mask_key):
s = ABNF.mask(mask_key, self.data)
return mask_key + b"".join(s)
@staticmethod
def mask(mask_key, data):
"""
mask or unmask data. Just do xor for each byte
mask_key: 4 byte string(byte).
data: data to mask/unmask.
"""
_m = array.array("B", mask_key)
_d = array.array("B", data)
for i in range(len(_d)):
_d[i] ^= _m[i % 4]
if sys.version_info >= (3, 2):
return _d.tobytes()
else:
return _d.tostring()
class WebSocket(object):
"""
Low level WebSocket interface.
This class is based on
The WebSocket protocol draft-hixie-thewebsocketprotocol-76
http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-76
We can connect to the websocket server and send/receive data.
The following example is a echo client.
>>> import websocket
>>> ws = websocket.WebSocket()
>>> ws.connect("ws://echo.websocket.org")
>>> ws.send("Hello, Server")
>>> ws.recv()
'Hello, Server'
>>> ws.close()
get_mask_key: a callable to produce new mask keys, see the set_mask_key
function's docstring for more details
sockopt: values for socket.setsockopt.
sockopt must be tuple and each element is argument of sock.setscokopt.
sslopt: dict object for ssl socket option.
"""
def __init__(self, get_mask_key=None, sockopt=None, sslopt=None):
"""
Initalize WebSocket object.
"""
if sockopt is None:
sockopt = []
if sslopt is None:
sslopt = {}
self.connected = False
self.sock = socket.socket()
for opts in sockopt:
self.sock.setsockopt(*opts)
self.sslopt = sslopt
self.get_mask_key = get_mask_key
# Buffers over the packets from the layer beneath until desired amount
# bytes of bytes are received.
self._recv_buffer = []
# These buffer over the build-up of a single frame.
self._frame_header = None
self._frame_length = None
self._frame_mask = None
self._cont_data = None
def fileno(self):
return self.sock.fileno()
def set_mask_key(self, func):
"""
set function to create musk key. You can custumize mask key generator.
Mainly, this is for testing purpose.
func: callable object. the fuct must 1 argument as integer.
The argument means length of mask key.
This func must be return string(byte array),
which length is argument specified.
"""
self.get_mask_key = func
def gettimeout(self):
"""
Get the websocket timeout(second).
"""
return self.sock.gettimeout()
def settimeout(self, timeout):
"""
Set the timeout to the websocket.
timeout: timeout time(second).
"""
self.sock.settimeout(timeout)
timeout = property(gettimeout, settimeout)
def connect(self, url, **options):
"""
Connect to url. url is websocket url scheme. ie. ws://host:port/resource
You can customize using 'options'.
If you set "header" dict object, you can set your own custom header.
>>> ws = WebSocket()
>>> ws.connect("ws://echo.websocket.org/",
... header={"User-Agent: MyProgram",
... "x-custom: header"})
timeout: socket timeout time. This value is integer.
if you set None for this value,
it means "use default_timeout value"
options: current support option is only "header".
if you set header as dict value,
the custom HTTP headers are added.
"""
hostname, port, resource, is_secure = _parse_url(url)
# TODO: we need to support proxy
self.sock.connect((hostname, port))
if is_secure:
if HAVE_SSL:
if self.sslopt is None:
sslopt = {}
else:
sslopt = self.sslopt
if ssl.HAS_SNI:
self.sock = _wrap_sni_socket(self.sock, sslopt, hostname)
else:
self.sock = ssl.wrap_socket(self.sock, **sslopt)
else:
raise WebSocketException("SSL not available.")
self._handshake(hostname, port, resource, **options)
def _handshake(self, host, port, resource, **options):
if isinstance(host, string_types):
host = host.encode('utf-8')
if isinstance(resource, string_types):
resource = resource.encode('utf-8')
headers = []
headers.append(b"GET %s HTTP/1.1" % resource)
headers.append(b"Upgrade: websocket")
headers.append(b"Connection: Upgrade")
if port == 80:
hostport = host
else:
hostport = b"%s:%d" % (host, port)
headers.append(b"Host: %s" % hostport)
if "origin" in options:
headers.append(b"Origin: %s" % options["origin"])
else:
headers.append(b"Origin: http://%s" % hostport)
key = _create_sec_websocket_key()
headers.append(b"Sec-WebSocket-Key: %s" % key)
headers.append(b"Sec-WebSocket-Version: %d" % VERSION)
if "header" in options:
for header in options["header"]:
if isinstance(header, string_types):
header = header.encode('utf-8')
headers.extend(header)
headers.append(b"")
headers.append(b"")
header_str = b"\r\n".join(headers)
self._send(header_str)
if traceEnabled:
logger.debug("--- request header ---")
logger.debug(header_str)
logger.debug("-----------------------")
status, resp_headers = self._read_headers()
if status != 101:
self.close()
raise WebSocketException("Handshake Status %d" % status)
success = self._validate_header(resp_headers, key)
if not success:
self.close()
raise WebSocketException("Invalid WebSocket Header")
self.connected = True
def _validate_header(self, headers, key):
if headers.get("connection", "").lower() != "upgrade" or headers.get("upgrade", "").lower() != "websocket":
return False
result = headers.get("sec-websocket-accept")
if not result:
return False
# https://tools.ietf.org/html/rfc6455#page-6
magic_string = b"258EAFA5-E914-47DA-95CA-C5AB0DC85B11"
hashed = base64.b64encode(hashlib.sha1(key + magic_string).digest())
return hashed.decode() == result
def _read_headers(self):
status = None
headers = {}
if traceEnabled:
logger.debug("--- response header ---")
while True:
line = self._recv_line()
if line == "\r\n":
break
line = line.strip()
if traceEnabled:
logger.debug(line)
if not status:
status_info = line.split(" ", 2)
status = int(status_info[1])
else:
kv = line.split(":", 1)
if len(kv) == 2:
key, value = kv
headers[key.lower()] = value.strip()
else:
raise WebSocketException("Invalid header")
if traceEnabled:
logger.debug("-----------------------")
return status, headers
def send(self, payload, opcode=ABNF.OPCODE_TEXT):
"""
Send the data as string.
payload: Payload must be utf-8 string or unicoce,
if the opcode is OPCODE_TEXT.
Otherwise, it must be string(byte array)
opcode: operation code to send. Please see OPCODE_XXX.
"""
frame = ABNF.create_frame(payload, opcode)
if self.get_mask_key:
frame.get_mask_key = self.get_mask_key
data = frame.format()
length = len(data)
if traceEnabled:
logger.debug("send: " + repr(data))
while data:
data = data[self._send(data):]
return length
def send_binary(self, payload):
return self.send(payload, ABNF.OPCODE_BINARY)
def ping(self, payload=b""):
"""
send ping data.
payload: data payload to send server.
"""
self.send(payload, ABNF.OPCODE_PING)
def pong(self, payload):
"""
send pong data.
payload: data payload to send server.
"""
self.send(payload, ABNF.OPCODE_PONG)
def recv(self):
"""
Receive string data(byte array) from the server.
return value: string(byte array) value.
"""
opcode, data = self.recv_data()
return data
def recv_data(self):
"""
Receive data with operation code.
return value: tuple of operation code and string(byte array) value.
"""
while True:
frame = self.recv_frame()
if not frame:
# handle error:
# 'NoneType' object has no attribute 'opcode'
raise WebSocketException("Not a valid frame %s" % frame)
elif frame.opcode in (ABNF.OPCODE_TEXT, ABNF.OPCODE_BINARY, ABNF.OPCODE_CONT):
if frame.opcode == ABNF.OPCODE_CONT and not self._cont_data:
raise WebSocketException("Illegal frame")
if self._cont_data:
self._cont_data[1] += frame.data
else:
self._cont_data = [frame.opcode, frame.data]
if frame.fin:
data = self._cont_data
self._cont_data = None
return data
elif frame.opcode == ABNF.OPCODE_CLOSE:
self.send_close()
return (frame.opcode, None)
elif frame.opcode == ABNF.OPCODE_PING:
self.pong(frame.data)
def recv_frame(self):
"""
receive data as frame from server.
return value: ABNF frame object.
"""
# Header
if self._frame_header is None:
self._frame_header = self._recv_strict(2)
b1 = indexbytes(self._frame_header, 0)
fin = b1 >> 7 & 1
rsv1 = b1 >> 6 & 1
rsv2 = b1 >> 5 & 1
rsv3 = b1 >> 4 & 1
opcode = b1 & 0xf
b2 = indexbytes(self._frame_header, 1)
has_mask = b2 >> 7 & 1
# Frame length
if self._frame_length is None:
length_bits = b2 & 0x7f
if length_bits == 0x7e:
length_data = self._recv_strict(2)
self._frame_length = struct.unpack("!H", length_data)[0]
elif length_bits == 0x7f:
length_data = self._recv_strict(8)
self._frame_length = struct.unpack("!Q", length_data)[0]
else:
self._frame_length = length_bits
# Mask
if self._frame_mask is None:
self._frame_mask = self._recv_strict(4) if has_mask else ""
# Payload
payload = self._recv_strict(self._frame_length)
if has_mask:
payload = ABNF.mask(self._frame_mask, payload)
# Reset for next frame
self._frame_header = None
self._frame_length = None
self._frame_mask = None
return ABNF(fin, rsv1, rsv2, rsv3, opcode, has_mask, payload)
def send_close(self, status=STATUS_NORMAL, reason=""):
"""
send close data to the server.
status: status code to send. see STATUS_XXX.
reason: the reason to close. This must be string.
"""
if status < 0 or status >= ABNF.LENGTH_16:
raise ValueError("code is invalid range")
self.send(struct.pack('!H', status) + reason, ABNF.OPCODE_CLOSE)
def close(self, status=STATUS_NORMAL, reason=""):
"""
Close Websocket object
status: status code to send. see STATUS_XXX.
reason: the reason to close. This must be string.
"""
try:
self.sock.shutdown(socket.SHUT_RDWR)
except Exception:
pass
'''
if self.connected:
if status < 0 or status >= ABNF.LENGTH_16:
raise ValueError("code is invalid range")
try:
self.send(struct.pack('!H', status) + reason, ABNF.OPCODE_CLOSE)
timeout = self.sock.gettimeout()
self.sock.settimeout(3)
try:
frame = self.recv_frame()
if logger.isEnabledFor(logging.ERROR):
recv_status = struct.unpack("!H", frame.data)[0]
if recv_status != STATUS_NORMAL:
logger.error("close status: " + repr(recv_status))
except:
pass
self.sock.settimeout(timeout)
self.sock.shutdown(socket.SHUT_RDWR)
except:
pass
'''
self._closeInternal()
def _closeInternal(self):
self.connected = False
self.sock.close()
def _send(self, data):
try:
return self.sock.send(data)
except socket.timeout as e:
raise WebSocketTimeoutException(e.args[0])
except Exception as e:
logger.exception(e)
if "timed out" in e.args[0]:
raise WebSocketTimeoutException(e.args[0])
else:
raise e
def _recv(self, bufsize):
try:
_bytes = self.sock.recv(bufsize)
except socket.timeout as e:
raise WebSocketTimeoutException(e.args[0])
except SSLError as e:
if e.args[0] == "The read operation timed out":
raise WebSocketTimeoutException(e.args[0])
else:
raise
if not _bytes:
raise WebSocketConnectionClosedException()
return _bytes
def _recv_strict(self, bufsize):
shortage = bufsize - sum(len(x) for x in self._recv_buffer)
while shortage > 0:
_bytes = self._recv(shortage)
self._recv_buffer.append(_bytes)
shortage -= len(_bytes)
unified = b"".join(self._recv_buffer)
if shortage == 0:
self._recv_buffer = []
return unified
else:
self._recv_buffer = [unified[bufsize:]]
return unified[:bufsize]
def _recv_line(self):
line = []
while True:
c = self._recv(1).decode()
line.append(c)
if c == "\n":
break
return "".join(line)
class WebSocketApp(object):
"""
Higher level of APIs are provided.
The interface is like JavaScript WebSocket object.
"""
def __init__(self, url, header=None,
on_open=None, on_message=None, on_error=None,
on_close=None, keep_running=True, get_mask_key=None):
"""
url: websocket url.
header: custom header for websocket handshake.
on_open: callable object which is called at opening websocket.
this function has one argument. The arugment is this class object.
on_message: callbale object which is called when received data.
on_message has 2 arguments.
The 1st arugment is this class object.
The passing 2nd arugment is utf-8 string which we get from the server.
on_error: callable object which is called when we get error.
on_error has 2 arguments.
The 1st arugment is this class object.
The passing 2nd arugment is exception object.
on_close: callable object which is called when closed the connection.
this function has one argument. The arugment is this class object.
keep_running: a boolean flag indicating whether the app's main loop should
keep running, defaults to True
get_mask_key: a callable to produce new mask keys, see the WebSocket.set_mask_key's
docstring for more information
"""
self.url = url
if header is None:
self.header = []
else:
self.header = header
self.on_open = on_open
self.on_message = on_message
self.on_error = on_error
self.on_close = on_close
self.keep_running = keep_running
self.get_mask_key = get_mask_key
self.sock = None
def send(self, data, opcode=ABNF.OPCODE_TEXT):
"""
send message.
data: message to send. If you set opcode to OPCODE_TEXT, data must be utf-8 string or unicode.
opcode: operation code of data. default is OPCODE_TEXT.
"""
if self.sock.send(data, opcode) == 0:
raise WebSocketConnectionClosedException()
def close(self):
"""
close websocket connection.
"""
self.keep_running = False
if self.sock is not None:
self.sock.close()
def _send_ping(self, interval):
while True:
for i in range(interval):
time.sleep(1)
if not self.keep_running:
return
self.sock.ping()
def run_forever(self, sockopt=None, sslopt=None, ping_interval=0):
"""
run event loop for WebSocket framework.
This loop is infinite loop and is alive during websocket is available.
sockopt: values for socket.setsockopt.
sockopt must be tuple and each element is argument of sock.setscokopt.
sslopt: ssl socket optional dict.
ping_interval: automatically send "ping" command every specified period(second)
if set to 0, not send automatically.
"""
if sockopt is None:
sockopt = []
if sslopt is None:
sslopt = {}
if self.sock:
raise WebSocketException("socket is already opened")
thread = None
self.keep_running = True
try:
self.sock = WebSocket(self.get_mask_key, sockopt=sockopt, sslopt=sslopt)
self.sock.settimeout(default_timeout)
self.sock.connect(self.url, header=self.header)
self._callback(self.on_open)
if ping_interval:
thread = threading.Thread(target=self._send_ping, args=(ping_interval,))
thread.setDaemon(True)
thread.start()
while self.keep_running:
try:
data = self.sock.recv()
if data is None or self.keep_running is False:
break
self._callback(self.on_message, data)
except Exception as e:
if "timed out" not in e.args[0]:
logger.exception(e)
raise e
except Exception as e:
logger.exception(e)
self._callback(self.on_error, e)
finally:
if thread:
self.keep_running = False
self.sock.close()
self._callback(self.on_close)
self.sock = None
def _callback(self, callback, *args):
if callback:
try:
callback(self, *args)
except Exception as e:
logger.exception(e)
if __name__ == "__main__":
enableTrace(True)
ws = create_connection("ws://echo.websocket.org/")
print("Sending 'Hello, World'...")
ws.send("Hello, World")
print("Sent")
print("Receiving...")
result = ws.recv()
print("Received '%s'" % result)
ws.close()
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