949 lines
32 KiB
Python
949 lines
32 KiB
Python
# Copyright 2014-2016 OpenMarket Ltd
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# Copyright 2018 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import logging
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import urllib.parse
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from http import HTTPStatus
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from io import BytesIO
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from typing import (
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TYPE_CHECKING,
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Any,
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BinaryIO,
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Callable,
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Dict,
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List,
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Mapping,
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Optional,
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Sequence,
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Tuple,
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Union,
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)
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import treq
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from canonicaljson import encode_canonical_json
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from netaddr import AddrFormatError, IPAddress, IPSet
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from prometheus_client import Counter
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from typing_extensions import Protocol
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from zope.interface import implementer, provider
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from OpenSSL import SSL
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from OpenSSL.SSL import VERIFY_NONE
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from twisted.internet import defer, error as twisted_error, protocol, ssl
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from twisted.internet.address import IPv4Address, IPv6Address
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from twisted.internet.interfaces import (
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IAddress,
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IDelayedCall,
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IHostResolution,
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IReactorPluggableNameResolver,
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IReactorTime,
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IResolutionReceiver,
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ITCPTransport,
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)
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from twisted.internet.protocol import connectionDone
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from twisted.internet.task import Cooperator
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from twisted.python.failure import Failure
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from twisted.web._newclient import ResponseDone
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from twisted.web.client import (
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Agent,
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HTTPConnectionPool,
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ResponseNeverReceived,
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readBody,
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)
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from twisted.web.http import PotentialDataLoss
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from twisted.web.http_headers import Headers
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from twisted.web.iweb import (
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UNKNOWN_LENGTH,
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IAgent,
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IBodyProducer,
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IPolicyForHTTPS,
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IResponse,
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)
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from synapse.api.errors import Codes, HttpResponseException, SynapseError
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from synapse.http import QuieterFileBodyProducer, RequestTimedOutError, redact_uri
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from synapse.http.proxyagent import ProxyAgent
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from synapse.http.types import QueryParams
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from synapse.logging.context import make_deferred_yieldable
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from synapse.logging.opentracing import set_tag, start_active_span, tags
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from synapse.types import ISynapseReactor
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from synapse.util import json_decoder
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from synapse.util.async_helpers import timeout_deferred
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if TYPE_CHECKING:
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from synapse.server import HomeServer
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logger = logging.getLogger(__name__)
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outgoing_requests_counter = Counter("synapse_http_client_requests", "", ["method"])
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incoming_responses_counter = Counter(
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"synapse_http_client_responses", "", ["method", "code"]
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)
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# the type of the headers list, to be passed to the t.w.h.Headers.
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# Actually we can mix str and bytes keys, but Mapping treats 'key' as invariant so
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# we simplify.
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RawHeaders = Union[Mapping[str, "RawHeaderValue"], Mapping[bytes, "RawHeaderValue"]]
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# the value actually has to be a List, but List is invariant so we can't specify that
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# the entries can either be Lists or bytes.
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RawHeaderValue = Sequence[Union[str, bytes]]
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def check_against_blacklist(
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ip_address: IPAddress, ip_whitelist: Optional[IPSet], ip_blacklist: IPSet
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) -> bool:
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"""
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Compares an IP address to allowed and disallowed IP sets.
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Args:
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ip_address: The IP address to check
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ip_whitelist: Allowed IP addresses.
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ip_blacklist: Disallowed IP addresses.
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Returns:
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True if the IP address is in the blacklist and not in the whitelist.
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"""
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if ip_address in ip_blacklist:
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if ip_whitelist is None or ip_address not in ip_whitelist:
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return True
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return False
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_EPSILON = 0.00000001
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def _make_scheduler(
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reactor: IReactorTime,
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) -> Callable[[Callable[[], object]], IDelayedCall]:
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"""Makes a schedular suitable for a Cooperator using the given reactor.
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(This is effectively just a copy from `twisted.internet.task`)
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"""
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def _scheduler(x: Callable[[], object]) -> IDelayedCall:
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return reactor.callLater(_EPSILON, x)
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return _scheduler
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class _IPBlacklistingResolver:
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"""
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A proxy for reactor.nameResolver which only produces non-blacklisted IP
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addresses, preventing DNS rebinding attacks on URL preview.
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"""
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def __init__(
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self,
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reactor: IReactorPluggableNameResolver,
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ip_whitelist: Optional[IPSet],
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ip_blacklist: IPSet,
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):
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"""
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Args:
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reactor: The twisted reactor.
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ip_whitelist: IP addresses to allow.
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ip_blacklist: IP addresses to disallow.
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"""
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self._reactor = reactor
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self._ip_whitelist = ip_whitelist
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self._ip_blacklist = ip_blacklist
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def resolveHostName(
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self, recv: IResolutionReceiver, hostname: str, portNumber: int = 0
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) -> IResolutionReceiver:
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addresses: List[IAddress] = []
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def _callback() -> None:
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has_bad_ip = False
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for address in addresses:
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# We only expect IPv4 and IPv6 addresses since only A/AAAA lookups
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# should go through this path.
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if not isinstance(address, (IPv4Address, IPv6Address)):
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continue
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ip_address = IPAddress(address.host)
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if check_against_blacklist(
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ip_address, self._ip_whitelist, self._ip_blacklist
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):
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logger.info(
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"Dropped %s from DNS resolution to %s due to blacklist"
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% (ip_address, hostname)
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)
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has_bad_ip = True
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# if we have a blacklisted IP, we'd like to raise an error to block the
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# request, but all we can really do from here is claim that there were no
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# valid results.
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if not has_bad_ip:
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for address in addresses:
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recv.addressResolved(address)
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recv.resolutionComplete()
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@provider(IResolutionReceiver)
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class EndpointReceiver:
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@staticmethod
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def resolutionBegan(resolutionInProgress: IHostResolution) -> None:
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recv.resolutionBegan(resolutionInProgress)
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@staticmethod
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def addressResolved(address: IAddress) -> None:
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addresses.append(address)
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@staticmethod
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def resolutionComplete() -> None:
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_callback()
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self._reactor.nameResolver.resolveHostName(
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EndpointReceiver, hostname, portNumber=portNumber
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)
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return recv
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@implementer(ISynapseReactor)
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class BlacklistingReactorWrapper:
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"""
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A Reactor wrapper which will prevent DNS resolution to blacklisted IP
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addresses, to prevent DNS rebinding.
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"""
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def __init__(
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self,
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reactor: IReactorPluggableNameResolver,
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ip_whitelist: Optional[IPSet],
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ip_blacklist: IPSet,
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):
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self._reactor = reactor
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# We need to use a DNS resolver which filters out blacklisted IP
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# addresses, to prevent DNS rebinding.
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self._nameResolver = _IPBlacklistingResolver(
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self._reactor, ip_whitelist, ip_blacklist
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)
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def __getattr__(self, attr: str) -> Any:
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# Passthrough to the real reactor except for the DNS resolver.
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if attr == "nameResolver":
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return self._nameResolver
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else:
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return getattr(self._reactor, attr)
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class BlacklistingAgentWrapper(Agent):
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"""
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An Agent wrapper which will prevent access to IP addresses being accessed
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directly (without an IP address lookup).
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"""
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def __init__(
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self,
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agent: IAgent,
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ip_whitelist: Optional[IPSet] = None,
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ip_blacklist: Optional[IPSet] = None,
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):
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"""
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Args:
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agent: The Agent to wrap.
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ip_whitelist: IP addresses to allow.
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ip_blacklist: IP addresses to disallow.
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"""
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self._agent = agent
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self._ip_whitelist = ip_whitelist
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self._ip_blacklist = ip_blacklist
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def request(
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self,
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method: bytes,
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uri: bytes,
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headers: Optional[Headers] = None,
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bodyProducer: Optional[IBodyProducer] = None,
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) -> defer.Deferred:
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h = urllib.parse.urlparse(uri.decode("ascii"))
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try:
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ip_address = IPAddress(h.hostname)
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except AddrFormatError:
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# Not an IP
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pass
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else:
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if check_against_blacklist(
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ip_address, self._ip_whitelist, self._ip_blacklist
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):
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logger.info("Blocking access to %s due to blacklist" % (ip_address,))
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e = SynapseError(
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HTTPStatus.FORBIDDEN, "IP address blocked by IP blacklist entry"
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)
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return defer.fail(Failure(e))
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return self._agent.request(
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method, uri, headers=headers, bodyProducer=bodyProducer
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)
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class SimpleHttpClient:
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"""
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A simple, no-frills HTTP client with methods that wrap up common ways of
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using HTTP in Matrix
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"""
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def __init__(
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self,
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hs: "HomeServer",
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treq_args: Optional[Dict[str, Any]] = None,
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ip_whitelist: Optional[IPSet] = None,
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ip_blacklist: Optional[IPSet] = None,
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use_proxy: bool = False,
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):
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"""
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Args:
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hs
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treq_args: Extra keyword arguments to be given to treq.request.
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ip_blacklist: The IP addresses that are blacklisted that
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we may not request.
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ip_whitelist: The whitelisted IP addresses, that we can
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request if it were otherwise caught in a blacklist.
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use_proxy: Whether proxy settings should be discovered and used
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from conventional environment variables.
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"""
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self.hs = hs
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self._ip_whitelist = ip_whitelist
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self._ip_blacklist = ip_blacklist
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self._extra_treq_args = treq_args or {}
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self.clock = hs.get_clock()
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user_agent = hs.version_string
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if hs.config.server.user_agent_suffix:
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user_agent = "%s %s" % (
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user_agent,
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hs.config.server.user_agent_suffix,
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)
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self.user_agent = user_agent.encode("ascii")
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# We use this for our body producers to ensure that they use the correct
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# reactor.
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self._cooperator = Cooperator(scheduler=_make_scheduler(hs.get_reactor()))
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if self._ip_blacklist:
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# If we have an IP blacklist, we need to use a DNS resolver which
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# filters out blacklisted IP addresses, to prevent DNS rebinding.
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self.reactor: ISynapseReactor = BlacklistingReactorWrapper(
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hs.get_reactor(), self._ip_whitelist, self._ip_blacklist
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)
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else:
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self.reactor = hs.get_reactor()
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# the pusher makes lots of concurrent SSL connections to sygnal, and
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# tends to do so in batches, so we need to allow the pool to keep
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# lots of idle connections around.
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pool = HTTPConnectionPool(self.reactor)
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# XXX: The justification for using the cache factor here is that larger instances
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# will need both more cache and more connections.
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# Still, this should probably be a separate dial
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pool.maxPersistentPerHost = max(int(100 * hs.config.caches.global_factor), 5)
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pool.cachedConnectionTimeout = 2 * 60
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self.agent: IAgent = ProxyAgent(
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self.reactor,
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hs.get_reactor(),
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connectTimeout=15,
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contextFactory=self.hs.get_http_client_context_factory(),
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pool=pool,
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use_proxy=use_proxy,
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)
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if self._ip_blacklist:
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# If we have an IP blacklist, we then install the blacklisting Agent
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# which prevents direct access to IP addresses, that are not caught
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# by the DNS resolution.
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self.agent = BlacklistingAgentWrapper(
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self.agent,
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ip_whitelist=self._ip_whitelist,
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ip_blacklist=self._ip_blacklist,
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)
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async def request(
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self,
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method: str,
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uri: str,
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data: Optional[bytes] = None,
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headers: Optional[Headers] = None,
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) -> IResponse:
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"""
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Args:
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method: HTTP method to use.
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uri: URI to query.
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data: Data to send in the request body, if applicable.
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headers: Request headers.
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Returns:
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Response object, once the headers have been read.
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Raises:
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RequestTimedOutError if the request times out before the headers are read
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"""
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outgoing_requests_counter.labels(method).inc()
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# log request but strip `access_token` (AS requests for example include this)
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logger.debug("Sending request %s %s", method, redact_uri(uri))
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with start_active_span(
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"outgoing-client-request",
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tags={
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tags.SPAN_KIND: tags.SPAN_KIND_RPC_CLIENT,
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tags.HTTP_METHOD: method,
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tags.HTTP_URL: uri,
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},
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finish_on_close=True,
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):
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try:
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body_producer = None
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if data is not None:
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body_producer = QuieterFileBodyProducer(
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BytesIO(data),
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cooperator=self._cooperator,
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)
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request_deferred: defer.Deferred = treq.request(
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method,
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uri,
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agent=self.agent,
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data=body_producer,
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headers=headers,
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# Avoid buffering the body in treq since we do not reuse
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# response bodies.
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unbuffered=True,
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**self._extra_treq_args,
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)
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# we use our own timeout mechanism rather than treq's as a workaround
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# for https://twistedmatrix.com/trac/ticket/9534.
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request_deferred = timeout_deferred(
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request_deferred,
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60,
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self.hs.get_reactor(),
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)
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# turn timeouts into RequestTimedOutErrors
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request_deferred.addErrback(_timeout_to_request_timed_out_error)
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response = await make_deferred_yieldable(request_deferred)
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incoming_responses_counter.labels(method, response.code).inc()
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logger.info(
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"Received response to %s %s: %s",
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method,
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redact_uri(uri),
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response.code,
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)
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return response
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except Exception as e:
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incoming_responses_counter.labels(method, "ERR").inc()
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logger.info(
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"Error sending request to %s %s: %s %s",
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method,
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redact_uri(uri),
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type(e).__name__,
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e.args[0],
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)
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set_tag(tags.ERROR, True)
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set_tag("error_reason", e.args[0])
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raise
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|
|
|
async def post_urlencoded_get_json(
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self,
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uri: str,
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args: Optional[Mapping[str, Union[str, List[str]]]] = None,
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headers: Optional[RawHeaders] = None,
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) -> Any:
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"""
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Args:
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uri: uri to query
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args: parameters to be url-encoded in the body
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headers: a map from header name to a list of values for that header
|
|
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|
Returns:
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parsed json
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|
Raises:
|
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RequestTimedOutError: if there is a timeout before the response headers
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are received. Note there is currently no timeout on reading the response
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body.
|
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HttpResponseException: On a non-2xx HTTP response.
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ValueError: if the response was not JSON
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"""
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# TODO: Do we ever want to log message contents?
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logger.debug("post_urlencoded_get_json args: %s", args)
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query_bytes = encode_query_args(args)
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actual_headers = {
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b"Content-Type": [b"application/x-www-form-urlencoded"],
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b"User-Agent": [self.user_agent],
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b"Accept": [b"application/json"],
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}
|
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if headers:
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actual_headers.update(headers) # type: ignore
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|
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response = await self.request(
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"POST", uri, headers=Headers(actual_headers), data=query_bytes
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)
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body = await make_deferred_yieldable(readBody(response))
|
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|
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if 200 <= response.code < 300:
|
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return json_decoder.decode(body.decode("utf-8"))
|
|
else:
|
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raise HttpResponseException(
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response.code, response.phrase.decode("ascii", errors="replace"), body
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)
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|
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async def post_json_get_json(
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self, uri: str, post_json: Any, headers: Optional[RawHeaders] = None
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) -> Any:
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"""
|
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|
|
Args:
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uri: URI to query.
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post_json: request body, to be encoded as json
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headers: a map from header name to a list of values for that header
|
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|
|
Returns:
|
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parsed json
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|
|
Raises:
|
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RequestTimedOutError: if there is a timeout before the response headers
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are received. Note there is currently no timeout on reading the response
|
|
body.
|
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|
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HttpResponseException: On a non-2xx HTTP response.
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|
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ValueError: if the response was not JSON
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"""
|
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json_str = encode_canonical_json(post_json)
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|
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logger.debug("HTTP POST %s -> %s", json_str, uri)
|
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|
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actual_headers = {
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b"Content-Type": [b"application/json"],
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b"User-Agent": [self.user_agent],
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b"Accept": [b"application/json"],
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}
|
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if headers:
|
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actual_headers.update(headers) # type: ignore
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|
|
response = await self.request(
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"POST", uri, headers=Headers(actual_headers), data=json_str
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)
|
|
|
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body = await make_deferred_yieldable(readBody(response))
|
|
|
|
if 200 <= response.code < 300:
|
|
return json_decoder.decode(body.decode("utf-8"))
|
|
else:
|
|
raise HttpResponseException(
|
|
response.code, response.phrase.decode("ascii", errors="replace"), body
|
|
)
|
|
|
|
async def get_json(
|
|
self,
|
|
uri: str,
|
|
args: Optional[QueryParams] = None,
|
|
headers: Optional[RawHeaders] = None,
|
|
) -> Any:
|
|
"""Gets some json from the given URI.
|
|
|
|
Args:
|
|
uri: The URI to request, not including query parameters
|
|
args: A dictionary used to create query string
|
|
headers: a map from header name to a list of values for that header
|
|
Returns:
|
|
Succeeds when we get a 2xx HTTP response, with the HTTP body as JSON.
|
|
Raises:
|
|
RequestTimedOutError: if there is a timeout before the response headers
|
|
are received. Note there is currently no timeout on reading the response
|
|
body.
|
|
|
|
HttpResponseException On a non-2xx HTTP response.
|
|
|
|
ValueError: if the response was not JSON
|
|
"""
|
|
actual_headers = {b"Accept": [b"application/json"]}
|
|
if headers:
|
|
actual_headers.update(headers) # type: ignore
|
|
|
|
body = await self.get_raw(uri, args, headers=actual_headers)
|
|
return json_decoder.decode(body.decode("utf-8"))
|
|
|
|
async def put_json(
|
|
self,
|
|
uri: str,
|
|
json_body: Any,
|
|
args: Optional[QueryParams] = None,
|
|
headers: Optional[RawHeaders] = None,
|
|
) -> Any:
|
|
"""Puts some json to the given URI.
|
|
|
|
Args:
|
|
uri: The URI to request, not including query parameters
|
|
json_body: The JSON to put in the HTTP body,
|
|
args: A dictionary used to create query strings
|
|
headers: a map from header name to a list of values for that header
|
|
Returns:
|
|
Succeeds when we get a 2xx HTTP response, with the HTTP body as JSON.
|
|
Raises:
|
|
RequestTimedOutError: if there is a timeout before the response headers
|
|
are received. Note there is currently no timeout on reading the response
|
|
body.
|
|
|
|
HttpResponseException On a non-2xx HTTP response.
|
|
|
|
ValueError: if the response was not JSON
|
|
"""
|
|
if args:
|
|
query_str = urllib.parse.urlencode(args, True)
|
|
uri = "%s?%s" % (uri, query_str)
|
|
|
|
json_str = encode_canonical_json(json_body)
|
|
|
|
actual_headers = {
|
|
b"Content-Type": [b"application/json"],
|
|
b"User-Agent": [self.user_agent],
|
|
b"Accept": [b"application/json"],
|
|
}
|
|
if headers:
|
|
actual_headers.update(headers) # type: ignore
|
|
|
|
response = await self.request(
|
|
"PUT", uri, headers=Headers(actual_headers), data=json_str
|
|
)
|
|
|
|
body = await make_deferred_yieldable(readBody(response))
|
|
|
|
if 200 <= response.code < 300:
|
|
return json_decoder.decode(body.decode("utf-8"))
|
|
else:
|
|
raise HttpResponseException(
|
|
response.code, response.phrase.decode("ascii", errors="replace"), body
|
|
)
|
|
|
|
async def get_raw(
|
|
self,
|
|
uri: str,
|
|
args: Optional[QueryParams] = None,
|
|
headers: Optional[RawHeaders] = None,
|
|
) -> bytes:
|
|
"""Gets raw text from the given URI.
|
|
|
|
Args:
|
|
uri: The URI to request, not including query parameters
|
|
args: A dictionary used to create query strings
|
|
headers: a map from header name to a list of values for that header
|
|
Returns:
|
|
Succeeds when we get a 2xx HTTP response, with the
|
|
HTTP body as bytes.
|
|
Raises:
|
|
RequestTimedOutError: if there is a timeout before the response headers
|
|
are received. Note there is currently no timeout on reading the response
|
|
body.
|
|
|
|
HttpResponseException on a non-2xx HTTP response.
|
|
"""
|
|
if args:
|
|
query_str = urllib.parse.urlencode(args, True)
|
|
uri = "%s?%s" % (uri, query_str)
|
|
|
|
actual_headers = {b"User-Agent": [self.user_agent]}
|
|
if headers:
|
|
actual_headers.update(headers) # type: ignore
|
|
|
|
response = await self.request("GET", uri, headers=Headers(actual_headers))
|
|
|
|
body = await make_deferred_yieldable(readBody(response))
|
|
|
|
if 200 <= response.code < 300:
|
|
return body
|
|
else:
|
|
raise HttpResponseException(
|
|
response.code, response.phrase.decode("ascii", errors="replace"), body
|
|
)
|
|
|
|
# XXX: FIXME: This is horribly copy-pasted from matrixfederationclient.
|
|
# The two should be factored out.
|
|
|
|
async def get_file(
|
|
self,
|
|
url: str,
|
|
output_stream: BinaryIO,
|
|
max_size: Optional[int] = None,
|
|
headers: Optional[RawHeaders] = None,
|
|
is_allowed_content_type: Optional[Callable[[str], bool]] = None,
|
|
) -> Tuple[int, Dict[bytes, List[bytes]], str, int]:
|
|
"""GETs a file from a given URL
|
|
Args:
|
|
url: The URL to GET
|
|
output_stream: File to write the response body to.
|
|
headers: A map from header name to a list of values for that header
|
|
is_allowed_content_type: A predicate to determine whether the
|
|
content type of the file we're downloading is allowed. If set and
|
|
it evaluates to False when called with the content type, the
|
|
request will be terminated before completing the download by
|
|
raising SynapseError.
|
|
Returns:
|
|
A tuple of the file length, dict of the response
|
|
headers, absolute URI of the response and HTTP response code.
|
|
|
|
Raises:
|
|
RequestTimedOutError: if there is a timeout before the response headers
|
|
are received. Note there is currently no timeout on reading the response
|
|
body.
|
|
|
|
SynapseError: if the response is not a 2xx, the remote file is too large, or
|
|
another exception happens during the download.
|
|
"""
|
|
|
|
actual_headers = {b"User-Agent": [self.user_agent]}
|
|
if headers:
|
|
actual_headers.update(headers) # type: ignore
|
|
|
|
response = await self.request("GET", url, headers=Headers(actual_headers))
|
|
|
|
resp_headers = dict(response.headers.getAllRawHeaders())
|
|
|
|
if response.code > 299:
|
|
logger.warning("Got %d when downloading %s" % (response.code, url))
|
|
raise SynapseError(
|
|
HTTPStatus.BAD_GATEWAY, "Got error %d" % (response.code,), Codes.UNKNOWN
|
|
)
|
|
|
|
if is_allowed_content_type and b"Content-Type" in resp_headers:
|
|
content_type = resp_headers[b"Content-Type"][0].decode("ascii")
|
|
if not is_allowed_content_type(content_type):
|
|
raise SynapseError(
|
|
HTTPStatus.BAD_GATEWAY,
|
|
(
|
|
"Requested file's content type not allowed for this operation: %s"
|
|
% content_type
|
|
),
|
|
)
|
|
|
|
# TODO: if our Content-Type is HTML or something, just read the first
|
|
# N bytes into RAM rather than saving it all to disk only to read it
|
|
# straight back in again
|
|
|
|
try:
|
|
d = read_body_with_max_size(response, output_stream, max_size)
|
|
|
|
# Ensure that the body is not read forever.
|
|
d = timeout_deferred(d, 30, self.hs.get_reactor())
|
|
|
|
length = await make_deferred_yieldable(d)
|
|
except BodyExceededMaxSize:
|
|
raise SynapseError(
|
|
HTTPStatus.BAD_GATEWAY,
|
|
"Requested file is too large > %r bytes" % (max_size,),
|
|
Codes.TOO_LARGE,
|
|
)
|
|
except defer.TimeoutError:
|
|
raise SynapseError(
|
|
HTTPStatus.BAD_GATEWAY,
|
|
"Requested file took too long to download",
|
|
Codes.TOO_LARGE,
|
|
)
|
|
except Exception as e:
|
|
raise SynapseError(
|
|
HTTPStatus.BAD_GATEWAY, ("Failed to download remote body: %s" % e)
|
|
) from e
|
|
|
|
return (
|
|
length,
|
|
resp_headers,
|
|
response.request.absoluteURI.decode("ascii"),
|
|
response.code,
|
|
)
|
|
|
|
|
|
def _timeout_to_request_timed_out_error(f: Failure) -> Failure:
|
|
if f.check(twisted_error.TimeoutError, twisted_error.ConnectingCancelledError):
|
|
# The TCP connection has its own timeout (set by the 'connectTimeout' param
|
|
# on the Agent), which raises twisted_error.TimeoutError exception.
|
|
raise RequestTimedOutError("Timeout connecting to remote server")
|
|
elif f.check(defer.TimeoutError, ResponseNeverReceived):
|
|
# this one means that we hit our overall timeout on the request
|
|
raise RequestTimedOutError("Timeout waiting for response from remote server")
|
|
|
|
return f
|
|
|
|
|
|
class ByteWriteable(Protocol):
|
|
"""The type of object which must be passed into read_body_with_max_size.
|
|
|
|
Typically this is a file object.
|
|
"""
|
|
|
|
def write(self, data: bytes) -> int:
|
|
pass
|
|
|
|
|
|
class BodyExceededMaxSize(Exception):
|
|
"""The maximum allowed size of the HTTP body was exceeded."""
|
|
|
|
|
|
class _DiscardBodyWithMaxSizeProtocol(protocol.Protocol):
|
|
"""A protocol which immediately errors upon receiving data."""
|
|
|
|
transport: Optional[ITCPTransport] = None
|
|
|
|
def __init__(self, deferred: defer.Deferred):
|
|
self.deferred = deferred
|
|
|
|
def _maybe_fail(self) -> None:
|
|
"""
|
|
Report a max size exceed error and disconnect the first time this is called.
|
|
"""
|
|
if not self.deferred.called:
|
|
self.deferred.errback(BodyExceededMaxSize())
|
|
# Close the connection (forcefully) since all the data will get
|
|
# discarded anyway.
|
|
assert self.transport is not None
|
|
self.transport.abortConnection()
|
|
|
|
def dataReceived(self, data: bytes) -> None:
|
|
self._maybe_fail()
|
|
|
|
def connectionLost(self, reason: Failure = connectionDone) -> None:
|
|
self._maybe_fail()
|
|
|
|
|
|
class _ReadBodyWithMaxSizeProtocol(protocol.Protocol):
|
|
"""A protocol which reads body to a stream, erroring if the body exceeds a maximum size."""
|
|
|
|
transport: Optional[ITCPTransport] = None
|
|
|
|
def __init__(
|
|
self, stream: ByteWriteable, deferred: defer.Deferred, max_size: Optional[int]
|
|
):
|
|
self.stream = stream
|
|
self.deferred = deferred
|
|
self.length = 0
|
|
self.max_size = max_size
|
|
|
|
def dataReceived(self, data: bytes) -> None:
|
|
# If the deferred was called, bail early.
|
|
if self.deferred.called:
|
|
return
|
|
|
|
try:
|
|
self.stream.write(data)
|
|
except Exception:
|
|
self.deferred.errback()
|
|
return
|
|
|
|
self.length += len(data)
|
|
# The first time the maximum size is exceeded, error and cancel the
|
|
# connection. dataReceived might be called again if data was received
|
|
# in the meantime.
|
|
if self.max_size is not None and self.length >= self.max_size:
|
|
self.deferred.errback(BodyExceededMaxSize())
|
|
# Close the connection (forcefully) since all the data will get
|
|
# discarded anyway.
|
|
assert self.transport is not None
|
|
self.transport.abortConnection()
|
|
|
|
def connectionLost(self, reason: Failure = connectionDone) -> None:
|
|
# If the maximum size was already exceeded, there's nothing to do.
|
|
if self.deferred.called:
|
|
return
|
|
|
|
if reason.check(ResponseDone):
|
|
self.deferred.callback(self.length)
|
|
elif reason.check(PotentialDataLoss):
|
|
# stolen from https://github.com/twisted/treq/pull/49/files
|
|
# http://twistedmatrix.com/trac/ticket/4840
|
|
self.deferred.callback(self.length)
|
|
else:
|
|
self.deferred.errback(reason)
|
|
|
|
|
|
def read_body_with_max_size(
|
|
response: IResponse, stream: ByteWriteable, max_size: Optional[int]
|
|
) -> "defer.Deferred[int]":
|
|
"""
|
|
Read a HTTP response body to a file-object. Optionally enforcing a maximum file size.
|
|
|
|
If the maximum file size is reached, the returned Deferred will resolve to a
|
|
Failure with a BodyExceededMaxSize exception.
|
|
|
|
Args:
|
|
response: The HTTP response to read from.
|
|
stream: The file-object to write to.
|
|
max_size: The maximum file size to allow.
|
|
|
|
Returns:
|
|
A Deferred which resolves to the length of the read body.
|
|
"""
|
|
d: "defer.Deferred[int]" = defer.Deferred()
|
|
|
|
# If the Content-Length header gives a size larger than the maximum allowed
|
|
# size, do not bother downloading the body.
|
|
if max_size is not None and response.length != UNKNOWN_LENGTH:
|
|
if response.length > max_size:
|
|
response.deliverBody(_DiscardBodyWithMaxSizeProtocol(d))
|
|
return d
|
|
|
|
response.deliverBody(_ReadBodyWithMaxSizeProtocol(stream, d, max_size))
|
|
return d
|
|
|
|
|
|
def encode_query_args(args: Optional[QueryParams]) -> bytes:
|
|
"""
|
|
Encodes a map of query arguments to bytes which can be appended to a URL.
|
|
|
|
Args:
|
|
args: The query arguments, a mapping of string to string or list of strings.
|
|
|
|
Returns:
|
|
The query arguments encoded as bytes.
|
|
"""
|
|
if args is None:
|
|
return b""
|
|
|
|
query_str = urllib.parse.urlencode(args, True)
|
|
|
|
return query_str.encode("utf8")
|
|
|
|
|
|
@implementer(IPolicyForHTTPS)
|
|
class InsecureInterceptableContextFactory(ssl.ContextFactory):
|
|
"""
|
|
Factory for PyOpenSSL SSL contexts which accepts any certificate for any domain.
|
|
|
|
Do not use this since it allows an attacker to intercept your communications.
|
|
"""
|
|
|
|
def __init__(self) -> None:
|
|
self._context = SSL.Context(SSL.SSLv23_METHOD)
|
|
self._context.set_verify(VERIFY_NONE, lambda *_: False)
|
|
|
|
def getContext(self, hostname=None, port=None):
|
|
return self._context
|
|
|
|
def creatorForNetloc(self, hostname: bytes, port: int):
|
|
return self
|