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# Copyright (C) 2019 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 nbxmpp.protocol import Error as ErrorStanza
from nbxmpp.protocol import ERR_BAD_REQUEST
from nbxmpp.protocol import ERR_FEATURE_NOT_IMPLEMENTED
from nbxmpp.protocol import NodeProcessed
from nbxmpp.protocol import Iq
from nbxmpp.protocol import NS_IBB
from nbxmpp.protocol import isResultNode
from nbxmpp.structs import CommonResult
from nbxmpp.structs import StanzaHandler
from nbxmpp.structs import IBBData
from nbxmpp.util import b64decode
from nbxmpp.util import b64encode
from nbxmpp.util import call_on_response
from nbxmpp.util import callback
from nbxmpp.util import raise_error
log = logging.getLogger('nbxmpp.m.ibb')
class IBB:
def __init__(self, client):
self._client = client
self.handlers = [
StanzaHandler(name='iq',
callback=self._process_ibb,
ns=NS_IBB,
priority=20),
]
def _process_ibb(self, _client, stanza, properties):
if properties.type.is_set:
open_ = stanza.getTag('open', namespace=NS_IBB)
if open_ is not None:
properties.ibb = self._parse_open(stanza, open_)
return
close = stanza.getTag('close', namespace=NS_IBB)
if close is not None:
properties.ibb = self._parse_close(stanza, close)
return
data = stanza.getTag('data', namespace=NS_IBB)
if data is not None:
properties.ibb = self._parse_data(stanza, data)
return
def _parse_open(self, stanza, open_):
attrs = open_.getAttrs()
try:
block_size = int(attrs.get('block-size'))
except Exception as error:
log.warning(error)
log.warning(stanza)
self._client.send_stanza(ErrorStanza(stanza, ERR_BAD_REQUEST))
raise NodeProcessed
if block_size > 65535:
log.warning('Invalid block-size')
self._client.send_stanza(ErrorStanza(stanza, ERR_BAD_REQUEST))
raise NodeProcessed
sid = attrs.get('sid')
if not sid:
log.warning('Invalid sid')
self._client.send_stanza(ErrorStanza(stanza, ERR_BAD_REQUEST))
raise NodeProcessed
type_ = attrs.get('stanza')
if type_ == 'message':
self._client.send_stanza(ErrorStanza(stanza,
ERR_FEATURE_NOT_IMPLEMENTED))
raise NodeProcessed
return IBBData(type='open', block_size=block_size, sid=sid)
def _parse_close(self, stanza, close):
sid = close.getAttrs().get('sid')
if sid is None:
log.warning('Invalid sid')
self._client.send_stanza(ErrorStanza(stanza, ERR_BAD_REQUEST))
raise NodeProcessed
return IBBData(type='close', sid=sid)
def _parse_data(self, stanza, data):
attrs = data.getAttrs()
sid = attrs.get('sid')
if sid is None:
log.warning('Invalid sid')
self._client.send_stanza(ErrorStanza(stanza, ERR_BAD_REQUEST))
raise NodeProcessed
try:
seq = int(attrs.get('seq'))
except Exception:
log.exception('Invalid seq')
self._client.send_stanza(ErrorStanza(stanza, ERR_BAD_REQUEST))
raise NodeProcessed
try:
decoded_data = b64decode(data.getData(), return_type=bytes)
except Exception:
log.exception('Failed to decode IBB data')
self._client.send_stanza(ErrorStanza(stanza, ERR_BAD_REQUEST))
raise NodeProcessed
return IBBData(type='data', sid=sid, seq=seq, data=decoded_data)
def send_reply(self, stanza, error=None):
if error is None:
reply = stanza.buildReply('result')
reply.getChildren().clear()
else:
reply = ErrorStanza(stanza, error)
self._client.send_stanza(reply)
@call_on_response('_default_response')
def send_open(self, jid, sid, block_size):
iq = Iq('set', to=jid)
iq.addChild('open',
{'block-size': block_size, 'sid': sid, 'stanza': 'iq'},
namespace=NS_IBB)
return iq
@call_on_response('_default_response')
def send_close(self, jid, sid):
iq = Iq('set', to=jid)
iq.addChild('close', {'sid': sid}, namespace=NS_IBB)
return iq
@call_on_response('_default_response')
def send_data(self, jid, sid, seq, data):
iq = Iq('set', to=jid)
ibb_data = iq.addChild('data', {'sid': sid, 'seq': seq}, namespace=NS_IBB)
ibb_data.setData(b64encode(data))
return iq
@callback
def _default_response(self, stanza):
if not isResultNode(stanza):
return raise_error(log.info, stanza)
return CommonResult(jid=stanza.getFrom())
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