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# Copyright (C) 2020 Philipp Hörist <philipp AT hoerist.com>
#
# This file is part of nbxmpp.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 3
# of the License, or (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; If not, see <http://www.gnu.org/licenses/>.
import logging
from gi.repository import Soup
from gi.repository import GLib
from gi.repository import Gio
from nbxmpp.const import TCPState
from nbxmpp.util import get_websocket_close_string
from nbxmpp.util import convert_tls_error_flags
from nbxmpp.connection import Connection
log = logging.getLogger('nbxmpp.websocket')
class WebsocketConnection(Connection):
def __init__(self, *args, **kwargs):
Connection.__init__(self, *args, **kwargs)
self._session = Soup.Session()
if self._log.getEffectiveLevel() == logging.INFO:
self._session.add_feature(
Soup.Logger.new(Soup.LoggerLogLevel.BODY))
self._websocket = None
self._cancellable = Gio.Cancellable()
self._input_closed = False
self._output_closed = False
def connect(self):
self._log.info('Try to connect to %s', self._address.uri)
self.state = TCPState.CONNECTING
message = Soup.Message.new('GET', self._address.uri)
assert message is not None
message.connect('accept-certificate', self._check_certificate)
message.connect('notify::tls-peer-certificate',
self._on_certificate_set)
message.connect('network-event', self._on_network_event)
message.set_flags(Soup.MessageFlags.NO_REDIRECT)
self._session.websocket_connect_async(message,
None,
['xmpp'],
GLib.PRIORITY_DEFAULT,
self._cancellable,
self._on_connect,
None)
def _on_connect(self, session, result, _user_data):
# TODO: check if protocol 'xmpp' is set
try:
self._websocket = session.websocket_connect_finish(result)
except GLib.Error as error:
quark = GLib.quark_try_string('g-io-error-quark')
if error.matches(quark, Gio.IOErrorEnum.CANCELLED):
self._finalize('disconnected')
return
self._log.info('Connection Error: %s', error)
self._finalize('connection-failed')
return
self._websocket.set_keepalive_interval(5)
self._websocket.set_max_incoming_payload_size(1048576)
self._websocket.connect('message', self._on_websocket_message)
self._websocket.connect('closed', self._on_websocket_closed)
self._websocket.connect('closing', self._on_websocket_closing)
self._websocket.connect('error', self._on_websocket_error)
self._websocket.connect('pong', self._on_websocket_pong)
self.state = TCPState.CONNECTED
self.notify('connected')
def start_tls_negotiation(self):
# Soup.Session does this automatically
raise NotImplementedError
def _check_certificate(self,
_message,
certificate,
errors):
self._peer_certificate = certificate
self._peer_certificate_errors = convert_tls_error_flags(errors)
if self._accept_certificate():
return True
self.notify('bad-certificate')
self._cancellable.cancel()
return False
def _on_network_event(
self,
message: Soup.Message,
event: Gio.SocketClientEvent,
connection: Gio.TlsConnection
) -> None:
if event == Gio.SocketClientEvent.TLS_HANDSHAKED:
self._tls_con = connection
def _on_certificate_set(self, message, _param):
if self._peer_certificate is not None:
return
# If the cert has errors _check_certificate() will set the cert.
self._peer_certificate = message.props.tls_peer_certificate
self._peer_certificate_errors = convert_tls_error_flags(
message.props.tls_peer_certificate_errors)
def _on_websocket_message(self, _websocket, _type, message):
data = message.get_data().decode()
self._log_stanza(data)
if self._input_closed:
self._log.warning('Received data after stream closed')
return
self.notify('data-received', data)
def _on_websocket_pong(self, _websocket, _message):
self._log.info('Pong received')
def _on_websocket_closed(self, websocket):
self._log.info('Closed %s', get_websocket_close_string(websocket))
self._finalize('disconnected')
def _on_websocket_closing(self, _websocket):
self._log.info('Closing')
def _on_websocket_error(self, _websocket, error):
self._log.error(error)
if self._state not in (TCPState.DISCONNECTED, TCPState.DISCONNECTING):
self._finalize('disconnected')
def send(self, stanza, now=False):
if self._state in (TCPState.DISCONNECTED, TCPState.DISCONNECTING):
self._log.warning('send() not possible in state: %s', self._state)
return
data = str(stanza)
self._websocket.send_text(data)
self._log_stanza(data, received=False)
self.notify('data-sent', stanza)
def disconnect(self):
if self._state == TCPState.CONNECTING:
self.state = TCPState.DISCONNECTING
self._cancellable.cancel()
return
if self._state in (TCPState.DISCONNECTED, TCPState.DISCONNECTING):
self._log.warning('Called disconnect on state: %s', self._state)
return
self._websocket.close(Soup.WebsocketCloseCode.NORMAL, None)
self.state = TCPState.DISCONNECTING
def _check_for_shutdown(self):
if self._input_closed and self._output_closed:
self._websocket.close(Soup.WebsocketCloseCode.NORMAL, None)
def shutdown_input(self):
self._log.info('Shutdown input')
self._input_closed = True
self._check_for_shutdown()
def shutdown_output(self):
self.state = TCPState.DISCONNECTING
self._log.info('Shutdown output')
self._output_closed = True
def _finalize(self, signal_name):
self._input_closed = True
self._output_closed = True
self.state = TCPState.DISCONNECTED
self.notify(signal_name)
self.destroy()
def destroy(self):
super().destroy()
self._session.abort()
self._session = None
self._websocket = None
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