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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 collections import namedtuple
from nbxmpp.util import Observable
from nbxmpp.resolver import GioResolver
from nbxmpp.const import ConnectionType
from nbxmpp.const import ConnectionProtocol
log = logging.getLogger('nbxmpp.addresses')
class ServerAddress(namedtuple('ServerAddress', 'domain service host uri '
'protocol type proxy')):
__slots__ = []
@property
def is_service(self):
return self.service is not None
@property
def is_host(self):
return self.host is not None
@property
def is_uri(self):
return self.uri is not None
def has_proxy(self):
return self.proxy is not None
class ServerAddresses(Observable):
'''
Signals:
resolved
'''
def __init__(self, domain):
Observable.__init__(self, log)
self._domain = domain
self._custom_host = None
self._proxy = None
self._is_resolved = False
self._addresses = [
ServerAddress(domain=self._domain,
service='xmpps-client',
host=None,
uri=None,
protocol=ConnectionProtocol.TCP,
type=ConnectionType.DIRECT_TLS,
proxy=None),
ServerAddress(domain=self._domain,
service='xmpp-client',
host=None,
uri=None,
protocol=ConnectionProtocol.TCP,
type=ConnectionType.START_TLS,
proxy=None),
ServerAddress(domain=self._domain,
service='xmpp-client',
host=None,
uri=None,
protocol=ConnectionProtocol.TCP,
type=ConnectionType.PLAIN,
proxy=None)
]
self._fallback_addresses = [
ServerAddress(domain=self._domain,
service=None,
host='%s:%s' % (self._domain, 5222),
uri=None,
protocol=ConnectionProtocol.TCP,
type=ConnectionType.START_TLS,
proxy=None),
ServerAddress(domain=self._domain,
service=None,
host='%s:%s' % (self._domain, 5222),
uri=None,
protocol=ConnectionProtocol.TCP,
type=ConnectionType.PLAIN,
proxy=None)
]
@property
def domain(self):
return self._domain
@property
def is_resolved(self):
return self._is_resolved
def resolve(self):
if self._is_resolved:
self._on_request_resolved()
return
if self._proxy is not None:
# Let the proxy resolve the domain
self._on_request_resolved()
return
if self._custom_host is not None:
self._on_request_resolved()
return
GioResolver().resolve_alternatives(self._domain,
self._on_alternatives_result)
def cancel_resolve(self):
self.remove_subscriptions()
def set_custom_host(self, address):
# Set a custom host, overwrites all other addresses
self._custom_host = address
if address is None:
return
host_or_uri, protocol, type_ = address
if protocol == ConnectionProtocol.WEBSOCKET:
host, uri = None, host_or_uri
else:
host, uri = host_or_uri, None
self._fallback_addresses = []
self._addresses = [
ServerAddress(domain=self._domain,
service=None,
host=host,
uri=uri,
protocol=protocol,
type=type_,
proxy=None)]
def set_proxy(self, proxy):
self._proxy = proxy
def _on_alternatives_result(self, uri):
if uri is None:
self._on_request_resolved()
return
if uri.startswith('wss'):
type_ = ConnectionType.DIRECT_TLS
elif uri.startswith('ws'):
type_ = ConnectionType.PLAIN
else:
log.warning('Invalid websocket uri: %s', uri)
self._on_request_resolved()
return
addr = ServerAddress(domain=self._domain,
service=None,
host=None,
uri=uri,
protocol=ConnectionProtocol.WEBSOCKET,
type=type_,
proxy=None)
self._addresses.append(addr)
self._on_request_resolved()
def _on_request_resolved(self):
self._is_resolved = True
self.notify('resolved')
self.remove_subscriptions()
def get_next_address(self,
allowed_types,
allowed_protocols):
'''
Selects next address
'''
for addr in self._filter_allowed(self._addresses,
allowed_types,
allowed_protocols):
yield self._assure_proxy(addr)
for addr in self._filter_allowed(self._fallback_addresses,
allowed_types,
allowed_protocols):
yield self._assure_proxy(addr)
raise NoMoreAddresses
def _assure_proxy(self, addr):
if self._proxy is None:
return addr
if addr.protocol == ConnectionProtocol.TCP:
return addr._replace(proxy=self._proxy)
return addr
def _filter_allowed(self, addresses, allowed_types, allowed_protocols):
if self._proxy is not None:
addresses = filter(lambda addr: addr.host is not None, addresses)
addresses = filter(lambda addr: addr.type in allowed_types,
addresses)
addresses = filter(lambda addr: addr.protocol in allowed_protocols,
addresses)
return addresses
def __str__(self):
addresses = self._addresses + self._fallback_addresses
return '\n'.join([str(addr) for addr in addresses])
class NoMoreAddresses(Exception):
pass
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