467 lines
15 KiB
Python
467 lines
15 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket 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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from OpenSSL import SSL
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from OpenSSL.SSL import VERIFY_NONE
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from synapse.api.errors import (
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CodeMessageException, SynapseError, Codes,
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)
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from synapse.util.logcontext import preserve_context_over_fn
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import synapse.metrics
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from synapse.http.endpoint import SpiderEndpoint
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from canonicaljson import encode_canonical_json
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from twisted.internet import defer, reactor, ssl, protocol
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from twisted.internet.endpoints import SSL4ClientEndpoint, TCP4ClientEndpoint
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from twisted.web.client import (
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BrowserLikeRedirectAgent, ContentDecoderAgent, GzipDecoder, Agent,
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readBody, FileBodyProducer, PartialDownloadError,
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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._newclient import ResponseDone
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from StringIO import StringIO
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import simplejson as json
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import logging
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import urllib
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logger = logging.getLogger(__name__)
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metrics = synapse.metrics.get_metrics_for(__name__)
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outgoing_requests_counter = metrics.register_counter(
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"requests",
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labels=["method"],
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)
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incoming_responses_counter = metrics.register_counter(
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"responses",
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labels=["method", "code"],
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)
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class SimpleHttpClient(object):
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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__(self, hs):
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self.hs = hs
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# The default context factory in Twisted 14.0.0 (which we require) is
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# BrowserLikePolicyForHTTPS which will do regular cert validation
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# 'like a browser'
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self.agent = Agent(
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reactor,
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connectTimeout=15,
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contextFactory=hs.get_http_client_context_factory()
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)
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self.user_agent = hs.version_string
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if hs.config.user_agent_suffix:
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self.user_agent = "%s %s" % (self.user_agent, hs.config.user_agent_suffix,)
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def request(self, method, uri, *args, **kwargs):
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# A small wrapper around self.agent.request() so we can easily attach
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# counters to it
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outgoing_requests_counter.inc(method)
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d = preserve_context_over_fn(
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self.agent.request,
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method, uri, *args, **kwargs
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)
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logger.info("Sending request %s %s", method, uri)
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def _cb(response):
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incoming_responses_counter.inc(method, response.code)
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logger.info(
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"Received response to %s %s: %s",
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method, uri, response.code
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)
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return response
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def _eb(failure):
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incoming_responses_counter.inc(method, "ERR")
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logger.info(
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"Error sending request to %s %s: %s %s",
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method, uri, failure.type, failure.getErrorMessage()
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)
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return failure
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d.addCallbacks(_cb, _eb)
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return d
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@defer.inlineCallbacks
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def post_urlencoded_get_json(self, uri, args={}):
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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 = urllib.urlencode(encode_urlencode_args(args), True)
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response = yield self.request(
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"POST",
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uri.encode("ascii"),
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headers=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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}),
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bodyProducer=FileBodyProducer(StringIO(query_bytes))
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)
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body = yield preserve_context_over_fn(readBody, response)
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defer.returnValue(json.loads(body))
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@defer.inlineCallbacks
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def post_json_get_json(self, uri, post_json):
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json_str = encode_canonical_json(post_json)
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logger.debug("HTTP POST %s -> %s", json_str, uri)
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response = yield self.request(
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"POST",
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uri.encode("ascii"),
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headers=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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}),
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bodyProducer=FileBodyProducer(StringIO(json_str))
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)
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body = yield preserve_context_over_fn(readBody, response)
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defer.returnValue(json.loads(body))
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@defer.inlineCallbacks
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def get_json(self, uri, args={}):
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""" Gets some json from the given URI.
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Args:
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uri (str): The URI to request, not including query parameters
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args (dict): A dictionary used to create query strings, defaults to
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None.
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**Note**: The value of each key is assumed to be an iterable
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and *not* a string.
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Returns:
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Deferred: Succeeds when we get *any* 2xx HTTP response, with the
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HTTP body as JSON.
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Raises:
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On a non-2xx HTTP response. The response body will be used as the
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error message.
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"""
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body = yield self.get_raw(uri, args)
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defer.returnValue(json.loads(body))
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@defer.inlineCallbacks
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def put_json(self, uri, json_body, args={}):
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""" Puts some json to the given URI.
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Args:
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uri (str): The URI to request, not including query parameters
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json_body (dict): The JSON to put in the HTTP body,
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args (dict): A dictionary used to create query strings, defaults to
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None.
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**Note**: The value of each key is assumed to be an iterable
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and *not* a string.
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Returns:
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Deferred: Succeeds when we get *any* 2xx HTTP response, with the
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HTTP body as JSON.
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Raises:
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On a non-2xx HTTP response.
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"""
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if len(args):
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query_bytes = urllib.urlencode(args, True)
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uri = "%s?%s" % (uri, query_bytes)
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json_str = encode_canonical_json(json_body)
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response = yield self.request(
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"PUT",
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uri.encode("ascii"),
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headers=Headers({
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b"User-Agent": [self.user_agent],
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"Content-Type": ["application/json"]
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}),
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bodyProducer=FileBodyProducer(StringIO(json_str))
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)
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body = yield preserve_context_over_fn(readBody, response)
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if 200 <= response.code < 300:
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defer.returnValue(json.loads(body))
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else:
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# NB: This is explicitly not json.loads(body)'d because the contract
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# of CodeMessageException is a *string* message. Callers can always
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# load it into JSON if they want.
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raise CodeMessageException(response.code, body)
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@defer.inlineCallbacks
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def get_raw(self, uri, args={}):
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""" Gets raw text from the given URI.
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Args:
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uri (str): The URI to request, not including query parameters
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args (dict): A dictionary used to create query strings, defaults to
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None.
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**Note**: The value of each key is assumed to be an iterable
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and *not* a string.
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Returns:
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Deferred: Succeeds when we get *any* 2xx HTTP response, with the
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HTTP body at text.
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Raises:
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On a non-2xx HTTP response. The response body will be used as the
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error message.
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"""
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if len(args):
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query_bytes = urllib.urlencode(args, True)
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uri = "%s?%s" % (uri, query_bytes)
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response = yield self.request(
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"GET",
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uri.encode("ascii"),
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headers=Headers({
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b"User-Agent": [self.user_agent],
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})
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)
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body = yield preserve_context_over_fn(readBody, response)
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if 200 <= response.code < 300:
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defer.returnValue(body)
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else:
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raise CodeMessageException(response.code, body)
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# XXX: FIXME: This is horribly copy-pasted from matrixfederationclient.
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# The two should be factored out.
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@defer.inlineCallbacks
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def get_file(self, url, output_stream, max_size=None):
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"""GETs a file from a given URL
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Args:
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url (str): The URL to GET
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output_stream (file): File to write the response body to.
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Returns:
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A (int,dict,string,int) tuple of the file length, dict of the response
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headers, absolute URI of the response and HTTP response code.
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"""
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response = yield self.request(
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"GET",
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url.encode("ascii"),
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headers=Headers({
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b"User-Agent": [self.user_agent],
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})
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)
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headers = dict(response.headers.getAllRawHeaders())
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if 'Content-Length' in headers and headers['Content-Length'] > max_size:
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logger.warn("Requested URL is too large > %r bytes" % (self.max_size,))
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raise SynapseError(
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502,
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"Requested file is too large > %r bytes" % (self.max_size,),
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Codes.TOO_LARGE,
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)
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if response.code > 299:
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logger.warn("Got %d when downloading %s" % (response.code, url))
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raise SynapseError(
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502,
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"Got error %d" % (response.code,),
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Codes.UNKNOWN,
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)
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# TODO: if our Content-Type is HTML or something, just read the first
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# N bytes into RAM rather than saving it all to disk only to read it
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# straight back in again
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try:
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length = yield preserve_context_over_fn(
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_readBodyToFile,
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response, output_stream, max_size
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)
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except Exception as e:
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logger.exception("Failed to download body")
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raise SynapseError(
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502,
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("Failed to download remote body: %s" % e),
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Codes.UNKNOWN,
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)
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defer.returnValue((length, headers, response.request.absoluteURI, response.code))
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# XXX: FIXME: This is horribly copy-pasted from matrixfederationclient.
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# The two should be factored out.
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class _ReadBodyToFileProtocol(protocol.Protocol):
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def __init__(self, stream, deferred, max_size):
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self.stream = stream
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self.deferred = deferred
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self.length = 0
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self.max_size = max_size
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def dataReceived(self, data):
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self.stream.write(data)
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self.length += len(data)
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if self.max_size is not None and self.length >= self.max_size:
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self.deferred.errback(SynapseError(
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502,
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"Requested file is too large > %r bytes" % (self.max_size,),
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Codes.TOO_LARGE,
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))
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self.deferred = defer.Deferred()
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self.transport.loseConnection()
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def connectionLost(self, reason):
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if reason.check(ResponseDone):
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self.deferred.callback(self.length)
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elif reason.check(PotentialDataLoss):
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# stolen from https://github.com/twisted/treq/pull/49/files
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# http://twistedmatrix.com/trac/ticket/4840
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self.deferred.callback(self.length)
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else:
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self.deferred.errback(reason)
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# XXX: FIXME: This is horribly copy-pasted from matrixfederationclient.
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# The two should be factored out.
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def _readBodyToFile(response, stream, max_size):
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d = defer.Deferred()
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response.deliverBody(_ReadBodyToFileProtocol(stream, d, max_size))
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return d
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class CaptchaServerHttpClient(SimpleHttpClient):
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"""
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Separate HTTP client for talking to google's captcha servers
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Only slightly special because accepts partial download responses
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used only by c/s api v1
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"""
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@defer.inlineCallbacks
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def post_urlencoded_get_raw(self, url, args={}):
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query_bytes = urllib.urlencode(encode_urlencode_args(args), True)
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response = yield self.request(
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"POST",
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url.encode("ascii"),
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bodyProducer=FileBodyProducer(StringIO(query_bytes)),
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headers=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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})
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)
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try:
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body = yield preserve_context_over_fn(readBody, response)
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defer.returnValue(body)
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except PartialDownloadError as e:
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# twisted dislikes google's response, no content length.
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defer.returnValue(e.response)
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class SpiderEndpointFactory(object):
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def __init__(self, hs):
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self.blacklist = hs.config.url_preview_ip_range_blacklist
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self.policyForHTTPS = hs.get_http_client_context_factory()
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def endpointForURI(self, uri):
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logger.info("Getting endpoint for %s", uri.toBytes())
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if uri.scheme == "http":
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return SpiderEndpoint(
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reactor, uri.host, uri.port, self.blacklist,
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endpoint=TCP4ClientEndpoint,
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endpoint_kw_args={
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'timeout': 15
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},
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)
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elif uri.scheme == "https":
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tlsPolicy = self.policyForHTTPS.creatorForNetloc(uri.host, uri.port)
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return SpiderEndpoint(
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reactor, uri.host, uri.port, self.blacklist,
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endpoint=SSL4ClientEndpoint,
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endpoint_kw_args={
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'sslContextFactory': tlsPolicy,
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'timeout': 15
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},
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)
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else:
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logger.warn("Can't get endpoint for unrecognised scheme %s", uri.scheme)
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class SpiderHttpClient(SimpleHttpClient):
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"""
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Separate HTTP client for spidering arbitrary URLs.
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Special in that it follows retries and has a UA that looks
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like a browser.
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used by the preview_url endpoint in the content repo.
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"""
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def __init__(self, hs):
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SimpleHttpClient.__init__(self, hs)
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# clobber the base class's agent and UA:
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self.agent = ContentDecoderAgent(
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BrowserLikeRedirectAgent(
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Agent.usingEndpointFactory(
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reactor,
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SpiderEndpointFactory(hs)
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)
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), [('gzip', GzipDecoder)]
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)
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# We could look like Chrome:
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# self.user_agent = ("Mozilla/5.0 (%s) (KHTML, like Gecko)
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# Chrome Safari" % hs.version_string)
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def encode_urlencode_args(args):
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return {k: encode_urlencode_arg(v) for k, v in args.items()}
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def encode_urlencode_arg(arg):
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if isinstance(arg, unicode):
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return arg.encode('utf-8')
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elif isinstance(arg, list):
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return [encode_urlencode_arg(i) for i in arg]
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else:
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return arg
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def _print_ex(e):
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if hasattr(e, "reasons") and e.reasons:
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for ex in e.reasons:
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_print_ex(ex)
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else:
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logger.exception(e)
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class InsecureInterceptableContextFactory(ssl.ContextFactory):
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"""
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Factory for PyOpenSSL SSL contexts which accepts any certificate for any domain.
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Do not use this since it allows an attacker to intercept your communications.
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"""
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def __init__(self):
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self._context = SSL.Context(SSL.SSLv23_METHOD)
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self._context.set_verify(VERIFY_NONE, lambda *_: None)
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def getContext(self, hostname, port):
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return self._context
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