306 lines
9.7 KiB
Python
306 lines
9.7 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 CodeMessageException
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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 canonicaljson import encode_canonical_json
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from twisted.internet import defer, reactor, ssl
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from twisted.web.client import (
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Agent, readBody, FileBodyProducer, PartialDownloadError,
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)
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from twisted.web.http_headers import Headers
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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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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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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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