495 lines
16 KiB
Python
495 lines
16 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2014-2016 OpenMarket Ltd
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
from OpenSSL import SSL
|
|
from OpenSSL.SSL import VERIFY_NONE
|
|
|
|
from synapse.api.errors import (
|
|
CodeMessageException, SynapseError, Codes,
|
|
)
|
|
from synapse.util.logcontext import preserve_context_over_fn
|
|
import synapse.metrics
|
|
from synapse.http.endpoint import SpiderEndpoint
|
|
|
|
from canonicaljson import encode_canonical_json
|
|
|
|
from twisted.internet import defer, reactor, ssl, protocol, task
|
|
from twisted.internet.endpoints import SSL4ClientEndpoint, TCP4ClientEndpoint
|
|
from twisted.web.client import (
|
|
BrowserLikeRedirectAgent, ContentDecoderAgent, GzipDecoder, Agent,
|
|
readBody, PartialDownloadError,
|
|
)
|
|
from twisted.web.client import FileBodyProducer as TwistedFileBodyProducer
|
|
from twisted.web.http import PotentialDataLoss
|
|
from twisted.web.http_headers import Headers
|
|
from twisted.web._newclient import ResponseDone
|
|
|
|
from StringIO import StringIO
|
|
|
|
import simplejson as json
|
|
import logging
|
|
import urllib
|
|
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
metrics = synapse.metrics.get_metrics_for(__name__)
|
|
|
|
outgoing_requests_counter = metrics.register_counter(
|
|
"requests",
|
|
labels=["method"],
|
|
)
|
|
incoming_responses_counter = metrics.register_counter(
|
|
"responses",
|
|
labels=["method", "code"],
|
|
)
|
|
|
|
|
|
class SimpleHttpClient(object):
|
|
"""
|
|
A simple, no-frills HTTP client with methods that wrap up common ways of
|
|
using HTTP in Matrix
|
|
"""
|
|
def __init__(self, hs):
|
|
self.hs = hs
|
|
# The default context factory in Twisted 14.0.0 (which we require) is
|
|
# BrowserLikePolicyForHTTPS which will do regular cert validation
|
|
# 'like a browser'
|
|
self.agent = Agent(
|
|
reactor,
|
|
connectTimeout=15,
|
|
contextFactory=hs.get_http_client_context_factory()
|
|
)
|
|
self.user_agent = hs.version_string
|
|
if hs.config.user_agent_suffix:
|
|
self.user_agent = "%s %s" % (self.user_agent, hs.config.user_agent_suffix,)
|
|
|
|
def request(self, method, uri, *args, **kwargs):
|
|
# A small wrapper around self.agent.request() so we can easily attach
|
|
# counters to it
|
|
outgoing_requests_counter.inc(method)
|
|
d = preserve_context_over_fn(
|
|
self.agent.request,
|
|
method, uri, *args, **kwargs
|
|
)
|
|
|
|
logger.info("Sending request %s %s", method, uri)
|
|
|
|
def _cb(response):
|
|
incoming_responses_counter.inc(method, response.code)
|
|
logger.info(
|
|
"Received response to %s %s: %s",
|
|
method, uri, response.code
|
|
)
|
|
return response
|
|
|
|
def _eb(failure):
|
|
incoming_responses_counter.inc(method, "ERR")
|
|
logger.info(
|
|
"Error sending request to %s %s: %s %s",
|
|
method, uri, failure.type, failure.getErrorMessage()
|
|
)
|
|
return failure
|
|
|
|
d.addCallbacks(_cb, _eb)
|
|
|
|
return d
|
|
|
|
@defer.inlineCallbacks
|
|
def post_urlencoded_get_json(self, uri, args={}):
|
|
# TODO: Do we ever want to log message contents?
|
|
logger.debug("post_urlencoded_get_json args: %s", args)
|
|
|
|
query_bytes = urllib.urlencode(encode_urlencode_args(args), True)
|
|
|
|
response = yield self.request(
|
|
"POST",
|
|
uri.encode("ascii"),
|
|
headers=Headers({
|
|
b"Content-Type": [b"application/x-www-form-urlencoded"],
|
|
b"User-Agent": [self.user_agent],
|
|
}),
|
|
bodyProducer=FileBodyProducer(StringIO(query_bytes))
|
|
)
|
|
|
|
body = yield preserve_context_over_fn(readBody, response)
|
|
|
|
defer.returnValue(json.loads(body))
|
|
|
|
@defer.inlineCallbacks
|
|
def post_json_get_json(self, uri, post_json):
|
|
json_str = encode_canonical_json(post_json)
|
|
|
|
logger.debug("HTTP POST %s -> %s", json_str, uri)
|
|
|
|
response = yield self.request(
|
|
"POST",
|
|
uri.encode("ascii"),
|
|
headers=Headers({
|
|
b"Content-Type": [b"application/json"],
|
|
b"User-Agent": [self.user_agent],
|
|
}),
|
|
bodyProducer=FileBodyProducer(StringIO(json_str))
|
|
)
|
|
|
|
body = yield preserve_context_over_fn(readBody, response)
|
|
|
|
defer.returnValue(json.loads(body))
|
|
|
|
@defer.inlineCallbacks
|
|
def get_json(self, uri, args={}):
|
|
""" Gets some json from the given URI.
|
|
|
|
Args:
|
|
uri (str): The URI to request, not including query parameters
|
|
args (dict): A dictionary used to create query strings, defaults to
|
|
None.
|
|
**Note**: The value of each key is assumed to be an iterable
|
|
and *not* a string.
|
|
Returns:
|
|
Deferred: Succeeds when we get *any* 2xx HTTP response, with the
|
|
HTTP body as JSON.
|
|
Raises:
|
|
On a non-2xx HTTP response. The response body will be used as the
|
|
error message.
|
|
"""
|
|
body = yield self.get_raw(uri, args)
|
|
defer.returnValue(json.loads(body))
|
|
|
|
@defer.inlineCallbacks
|
|
def put_json(self, uri, json_body, args={}):
|
|
""" Puts some json to the given URI.
|
|
|
|
Args:
|
|
uri (str): The URI to request, not including query parameters
|
|
json_body (dict): The JSON to put in the HTTP body,
|
|
args (dict): A dictionary used to create query strings, defaults to
|
|
None.
|
|
**Note**: The value of each key is assumed to be an iterable
|
|
and *not* a string.
|
|
Returns:
|
|
Deferred: Succeeds when we get *any* 2xx HTTP response, with the
|
|
HTTP body as JSON.
|
|
Raises:
|
|
On a non-2xx HTTP response.
|
|
"""
|
|
if len(args):
|
|
query_bytes = urllib.urlencode(args, True)
|
|
uri = "%s?%s" % (uri, query_bytes)
|
|
|
|
json_str = encode_canonical_json(json_body)
|
|
|
|
response = yield self.request(
|
|
"PUT",
|
|
uri.encode("ascii"),
|
|
headers=Headers({
|
|
b"User-Agent": [self.user_agent],
|
|
"Content-Type": ["application/json"]
|
|
}),
|
|
bodyProducer=FileBodyProducer(StringIO(json_str))
|
|
)
|
|
|
|
body = yield preserve_context_over_fn(readBody, response)
|
|
|
|
if 200 <= response.code < 300:
|
|
defer.returnValue(json.loads(body))
|
|
else:
|
|
# NB: This is explicitly not json.loads(body)'d because the contract
|
|
# of CodeMessageException is a *string* message. Callers can always
|
|
# load it into JSON if they want.
|
|
raise CodeMessageException(response.code, body)
|
|
|
|
@defer.inlineCallbacks
|
|
def get_raw(self, uri, args={}):
|
|
""" Gets raw text from the given URI.
|
|
|
|
Args:
|
|
uri (str): The URI to request, not including query parameters
|
|
args (dict): A dictionary used to create query strings, defaults to
|
|
None.
|
|
**Note**: The value of each key is assumed to be an iterable
|
|
and *not* a string.
|
|
Returns:
|
|
Deferred: Succeeds when we get *any* 2xx HTTP response, with the
|
|
HTTP body at text.
|
|
Raises:
|
|
On a non-2xx HTTP response. The response body will be used as the
|
|
error message.
|
|
"""
|
|
if len(args):
|
|
query_bytes = urllib.urlencode(args, True)
|
|
uri = "%s?%s" % (uri, query_bytes)
|
|
|
|
response = yield self.request(
|
|
"GET",
|
|
uri.encode("ascii"),
|
|
headers=Headers({
|
|
b"User-Agent": [self.user_agent],
|
|
})
|
|
)
|
|
|
|
body = yield preserve_context_over_fn(readBody, response)
|
|
|
|
if 200 <= response.code < 300:
|
|
defer.returnValue(body)
|
|
else:
|
|
raise CodeMessageException(response.code, body)
|
|
|
|
# XXX: FIXME: This is horribly copy-pasted from matrixfederationclient.
|
|
# The two should be factored out.
|
|
|
|
@defer.inlineCallbacks
|
|
def get_file(self, url, output_stream, max_size=None):
|
|
"""GETs a file from a given URL
|
|
Args:
|
|
url (str): The URL to GET
|
|
output_stream (file): File to write the response body to.
|
|
Returns:
|
|
A (int,dict,string,int) tuple of the file length, dict of the response
|
|
headers, absolute URI of the response and HTTP response code.
|
|
"""
|
|
|
|
response = yield self.request(
|
|
"GET",
|
|
url.encode("ascii"),
|
|
headers=Headers({
|
|
b"User-Agent": [self.user_agent],
|
|
})
|
|
)
|
|
|
|
headers = dict(response.headers.getAllRawHeaders())
|
|
|
|
if 'Content-Length' in headers and headers['Content-Length'] > max_size:
|
|
logger.warn("Requested URL is too large > %r bytes" % (self.max_size,))
|
|
raise SynapseError(
|
|
502,
|
|
"Requested file is too large > %r bytes" % (self.max_size,),
|
|
Codes.TOO_LARGE,
|
|
)
|
|
|
|
if response.code > 299:
|
|
logger.warn("Got %d when downloading %s" % (response.code, url))
|
|
raise SynapseError(
|
|
502,
|
|
"Got error %d" % (response.code,),
|
|
Codes.UNKNOWN,
|
|
)
|
|
|
|
# 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:
|
|
length = yield preserve_context_over_fn(
|
|
_readBodyToFile,
|
|
response, output_stream, max_size
|
|
)
|
|
except Exception as e:
|
|
logger.exception("Failed to download body")
|
|
raise SynapseError(
|
|
502,
|
|
("Failed to download remote body: %s" % e),
|
|
Codes.UNKNOWN,
|
|
)
|
|
|
|
defer.returnValue((length, headers, response.request.absoluteURI, response.code))
|
|
|
|
|
|
# XXX: FIXME: This is horribly copy-pasted from matrixfederationclient.
|
|
# The two should be factored out.
|
|
|
|
class _ReadBodyToFileProtocol(protocol.Protocol):
|
|
def __init__(self, stream, deferred, max_size):
|
|
self.stream = stream
|
|
self.deferred = deferred
|
|
self.length = 0
|
|
self.max_size = max_size
|
|
|
|
def dataReceived(self, data):
|
|
self.stream.write(data)
|
|
self.length += len(data)
|
|
if self.max_size is not None and self.length >= self.max_size:
|
|
self.deferred.errback(SynapseError(
|
|
502,
|
|
"Requested file is too large > %r bytes" % (self.max_size,),
|
|
Codes.TOO_LARGE,
|
|
))
|
|
self.deferred = defer.Deferred()
|
|
self.transport.loseConnection()
|
|
|
|
def connectionLost(self, reason):
|
|
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)
|
|
|
|
|
|
# XXX: FIXME: This is horribly copy-pasted from matrixfederationclient.
|
|
# The two should be factored out.
|
|
|
|
def _readBodyToFile(response, stream, max_size):
|
|
d = defer.Deferred()
|
|
response.deliverBody(_ReadBodyToFileProtocol(stream, d, max_size))
|
|
return d
|
|
|
|
|
|
class CaptchaServerHttpClient(SimpleHttpClient):
|
|
"""
|
|
Separate HTTP client for talking to google's captcha servers
|
|
Only slightly special because accepts partial download responses
|
|
|
|
used only by c/s api v1
|
|
"""
|
|
|
|
@defer.inlineCallbacks
|
|
def post_urlencoded_get_raw(self, url, args={}):
|
|
query_bytes = urllib.urlencode(encode_urlencode_args(args), True)
|
|
|
|
response = yield self.request(
|
|
"POST",
|
|
url.encode("ascii"),
|
|
bodyProducer=FileBodyProducer(StringIO(query_bytes)),
|
|
headers=Headers({
|
|
b"Content-Type": [b"application/x-www-form-urlencoded"],
|
|
b"User-Agent": [self.user_agent],
|
|
})
|
|
)
|
|
|
|
try:
|
|
body = yield preserve_context_over_fn(readBody, response)
|
|
defer.returnValue(body)
|
|
except PartialDownloadError as e:
|
|
# twisted dislikes google's response, no content length.
|
|
defer.returnValue(e.response)
|
|
|
|
|
|
class SpiderEndpointFactory(object):
|
|
def __init__(self, hs):
|
|
self.blacklist = hs.config.url_preview_ip_range_blacklist
|
|
self.whitelist = hs.config.url_preview_ip_range_whitelist
|
|
self.policyForHTTPS = hs.get_http_client_context_factory()
|
|
|
|
def endpointForURI(self, uri):
|
|
logger.info("Getting endpoint for %s", uri.toBytes())
|
|
if uri.scheme == "http":
|
|
return SpiderEndpoint(
|
|
reactor, uri.host, uri.port, self.blacklist, self.whitelist,
|
|
endpoint=TCP4ClientEndpoint,
|
|
endpoint_kw_args={
|
|
'timeout': 15
|
|
},
|
|
)
|
|
elif uri.scheme == "https":
|
|
tlsPolicy = self.policyForHTTPS.creatorForNetloc(uri.host, uri.port)
|
|
return SpiderEndpoint(
|
|
reactor, uri.host, uri.port, self.blacklist, self.whitelist,
|
|
endpoint=SSL4ClientEndpoint,
|
|
endpoint_kw_args={
|
|
'sslContextFactory': tlsPolicy,
|
|
'timeout': 15
|
|
},
|
|
)
|
|
else:
|
|
logger.warn("Can't get endpoint for unrecognised scheme %s", uri.scheme)
|
|
|
|
|
|
class SpiderHttpClient(SimpleHttpClient):
|
|
"""
|
|
Separate HTTP client for spidering arbitrary URLs.
|
|
Special in that it follows retries and has a UA that looks
|
|
like a browser.
|
|
|
|
used by the preview_url endpoint in the content repo.
|
|
"""
|
|
def __init__(self, hs):
|
|
SimpleHttpClient.__init__(self, hs)
|
|
# clobber the base class's agent and UA:
|
|
self.agent = ContentDecoderAgent(
|
|
BrowserLikeRedirectAgent(
|
|
Agent.usingEndpointFactory(
|
|
reactor,
|
|
SpiderEndpointFactory(hs)
|
|
)
|
|
), [('gzip', GzipDecoder)]
|
|
)
|
|
# We could look like Chrome:
|
|
# self.user_agent = ("Mozilla/5.0 (%s) (KHTML, like Gecko)
|
|
# Chrome Safari" % hs.version_string)
|
|
|
|
|
|
def encode_urlencode_args(args):
|
|
return {k: encode_urlencode_arg(v) for k, v in args.items()}
|
|
|
|
|
|
def encode_urlencode_arg(arg):
|
|
if isinstance(arg, unicode):
|
|
return arg.encode('utf-8')
|
|
elif isinstance(arg, list):
|
|
return [encode_urlencode_arg(i) for i in arg]
|
|
else:
|
|
return arg
|
|
|
|
|
|
def _print_ex(e):
|
|
if hasattr(e, "reasons") and e.reasons:
|
|
for ex in e.reasons:
|
|
_print_ex(ex)
|
|
else:
|
|
logger.exception(e)
|
|
|
|
|
|
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):
|
|
self._context = SSL.Context(SSL.SSLv23_METHOD)
|
|
self._context.set_verify(VERIFY_NONE, lambda *_: None)
|
|
|
|
def getContext(self, hostname=None, port=None):
|
|
return self._context
|
|
|
|
def creatorForNetloc(self, hostname, port):
|
|
return self
|
|
|
|
|
|
class FileBodyProducer(TwistedFileBodyProducer):
|
|
"""Workaround for https://twistedmatrix.com/trac/ticket/8473
|
|
|
|
We override the pauseProducing and resumeProducing methods in twisted's
|
|
FileBodyProducer so that they do not raise exceptions if the task has
|
|
already completed.
|
|
"""
|
|
|
|
def pauseProducing(self):
|
|
try:
|
|
super(FileBodyProducer, self).pauseProducing()
|
|
except task.TaskDone:
|
|
# task has already completed
|
|
pass
|
|
|
|
def resumeProducing(self):
|
|
try:
|
|
super(FileBodyProducer, self).resumeProducing()
|
|
except task.NotPaused:
|
|
# task was not paused (probably because it had already completed)
|
|
pass
|