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# Copyright (C) 2020 Philipp Hörist <philipp AT hoerist.com>
#
# This file is part of nbxmpp.
#
# SPDX-License-Identifier: GPL-3.0-or-later
import logging
from collections.abc import Iterator
from nbxmpp.const import ConnectionProtocol
from nbxmpp.const import ConnectionType
from nbxmpp.http import HTTPRequest
from nbxmpp.http import HTTPSession
from nbxmpp.structs import ProxyData
from nbxmpp.structs import ServerAddress
from nbxmpp.types import CustomHostT
from nbxmpp.util import Observable
from nbxmpp.util import parse_websocket_uri
log = logging.getLogger("nbxmpp.addresses")
class ServerAddresses(Observable):
"""
Signals:
resolved
"""
def __init__(self, domain: str | None) -> None:
Observable.__init__(self, log)
self._domain = domain
self._http_session: HTTPSession | None = None
self._custom_host: CustomHostT | None = None
self._proxy: ProxyData | None = None
self._is_resolved = False
self._addresses: list[ServerAddress] = [
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: list[ServerAddress] = [
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) -> str | None:
return self._domain
@property
def is_resolved(self) -> bool:
return self._is_resolved
def resolve(self) -> None:
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
self._resolve_alternatives()
def _resolve_alternatives(self) -> None:
if self._http_session is None:
self._on_request_resolved()
return
request = self._http_session.create_request()
request.send(
"GET",
f"https://{self._domain}/.well-known/host-meta",
timeout=5,
callback=self._on_alternatives_result,
)
def _on_alternatives_result(self, request: HTTPRequest) -> None:
if not request.is_complete():
log.info(
"Failed to retrieve host-meta file: %s", request.get_error_string()
)
self._on_request_resolved()
return
response_body = request.get_data()
if not response_body:
log.info("No response body data found")
self._on_request_resolved()
return
try:
uri = parse_websocket_uri(response_body.decode())
except Exception as error:
log.info("Error parsing websocket uri: %s", error)
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 cancel_resolve(self) -> None:
self.remove_subscriptions()
def set_custom_host(self, address: CustomHostT | None) -> None:
# 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: ProxyData | None) -> None:
self._proxy = proxy
def set_http_session(self, session: HTTPSession) -> None:
self._http_session = session
def _on_request_resolved(self) -> None:
self._is_resolved = True
self.notify("resolved")
self.remove_subscriptions()
def get_next_address(
self,
allowed_types: list[ConnectionType],
allowed_protocols: list[ConnectionProtocol],
) -> Iterator[ServerAddress]:
"""
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: ServerAddress) -> ServerAddress:
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: list[ServerAddress],
allowed_types: list[ConnectionType],
allowed_protocols: list[ConnectionProtocol],
) -> Iterator[ServerAddress]:
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) -> str:
addresses = self._addresses + self._fallback_addresses
return "\n".join([str(addr) for addr in addresses])
class NoMoreAddresses(Exception):
pass
|
