synapse-product/synapse/federation/transport/server.py

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# -*- coding: utf-8 -*-
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# Copyright 2014, 2015 OpenMarket Ltd
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#
# 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.
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from twisted.internet import defer
from synapse.api.urls import FEDERATION_PREFIX as PREFIX
from synapse.api.errors import Codes, SynapseError
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from synapse.util.logutils import log_function
import functools
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import logging
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import simplejson as json
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import re
logger = logging.getLogger(__name__)
class TransportLayerServer(object):
"""Handles incoming federation HTTP requests"""
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# A method just so we can pass 'self' as the authenticator to the Servlets
@defer.inlineCallbacks
def authenticate_request(self, request):
json_request = {
"method": request.method,
"uri": request.uri,
"destination": self.server_name,
"signatures": {},
}
content = None
origin = None
if request.method in ["PUT", "POST"]:
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# TODO: Handle other method types? other content types?
try:
content_bytes = request.content.read()
content = json.loads(content_bytes)
json_request["content"] = content
except:
raise SynapseError(400, "Unable to parse JSON", Codes.BAD_JSON)
def parse_auth_header(header_str):
try:
params = auth.split(" ")[1].split(",")
param_dict = dict(kv.split("=") for kv in params)
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def strip_quotes(value):
if value.startswith("\""):
return value[1:-1]
else:
return value
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origin = strip_quotes(param_dict["origin"])
key = strip_quotes(param_dict["key"])
sig = strip_quotes(param_dict["sig"])
return (origin, key, sig)
except:
raise SynapseError(
400, "Malformed Authorization header", Codes.UNAUTHORIZED
)
auth_headers = request.requestHeaders.getRawHeaders(b"Authorization")
if not auth_headers:
raise SynapseError(
401, "Missing Authorization headers", Codes.UNAUTHORIZED,
)
for auth in auth_headers:
if auth.startswith("X-Matrix"):
(origin, key, sig) = parse_auth_header(auth)
json_request["origin"] = origin
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json_request["signatures"].setdefault(origin, {})[key] = sig
if not json_request["signatures"]:
raise SynapseError(
401, "Missing Authorization headers", Codes.UNAUTHORIZED,
)
yield self.keyring.verify_json_for_server(origin, json_request)
logger.info("Request from %s", origin)
defer.returnValue((origin, content))
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@log_function
def register_received_handler(self, handler):
""" Register a handler that will be fired when we receive data.
Args:
handler (TransportReceivedHandler)
"""
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FederationSendServlet(
handler,
authenticator=self,
ratelimiter=self.ratelimiter,
server_name=self.server_name,
).register(self.server)
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@log_function
def register_request_handler(self, handler):
""" Register a handler that will be fired when we get asked for data.
Args:
handler (TransportRequestHandler)
"""
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for servletclass in SERVLET_CLASSES:
servletclass(
handler,
authenticator=self,
ratelimiter=self.ratelimiter,
).register(self.server)
class BaseFederationServlet(object):
def __init__(self, handler, authenticator, ratelimiter):
self.handler = handler
self.authenticator = authenticator
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self.ratelimiter = ratelimiter
def _wrap(self, code):
authenticator = self.authenticator
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ratelimiter = self.ratelimiter
@defer.inlineCallbacks
@functools.wraps(code)
def new_code(request, *args, **kwargs):
try:
(origin, content) = yield authenticator.authenticate_request(request)
with ratelimiter.ratelimit(origin) as d:
yield d
response = yield code(
origin, content, request.args, *args, **kwargs
)
except:
logger.exception("authenticate_request failed")
raise
defer.returnValue(response)
# Extra logic that functools.wraps() doesn't finish
new_code.__self__ = code.__self__
return new_code
def register(self, server):
pattern = re.compile("^" + PREFIX + self.PATH + "$")
for method in ("GET", "PUT", "POST"):
code = getattr(self, "on_%s" % (method), None)
if code is None:
continue
server.register_path(method, pattern, self._wrap(code))
class FederationSendServlet(BaseFederationServlet):
PATH = "/send/([^/]*)/"
def __init__(self, handler, server_name, **kwargs):
super(FederationSendServlet, self).__init__(handler, **kwargs)
self.server_name = server_name
# This is when someone is trying to send us a bunch of data.
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@defer.inlineCallbacks
def on_PUT(self, origin, content, query, transaction_id):
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""" Called on PUT /send/<transaction_id>/
Args:
request (twisted.web.http.Request): The HTTP request.
transaction_id (str): The transaction_id associated with this
request. This is *not* None.
Returns:
Deferred: Results in a tuple of `(code, response)`, where
`response` is a python dict to be converted into JSON that is
used as the response body.
"""
# Parse the request
try:
transaction_data = content
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logger.debug(
"Decoded %s: %s",
transaction_id, str(transaction_data)
)
logger.info(
"Received txn %s from %s. (PDUs: %d, EDUs: %d, failures: %d)",
transaction_id, origin,
len(transaction_data.get("pdus", [])),
len(transaction_data.get("edus", [])),
len(transaction_data.get("failures", [])),
)
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# We should ideally be getting this from the security layer.
# origin = body["origin"]
# Add some extra data to the transaction dict that isn't included
# in the request body.
transaction_data.update(
transaction_id=transaction_id,
destination=self.server_name
)
except Exception as e:
logger.exception(e)
defer.returnValue((400, {"error": "Invalid transaction"}))
return
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try:
code, response = yield self.handler.on_incoming_transaction(
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transaction_data
)
except:
logger.exception("on_incoming_transaction failed")
raise
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defer.returnValue((code, response))
class FederationPullServlet(BaseFederationServlet):
PATH = "/pull/"
# This is for when someone asks us for everything since version X
def on_GET(self, origin, content, query):
return self.handler.on_pull_request(query["origin"][0], query["v"])
class FederationEventServlet(BaseFederationServlet):
PATH = "/event/([^/]*)/"
# This is when someone asks for a data item for a given server data_id pair.
def on_GET(self, origin, content, query, event_id):
return self.handler.on_pdu_request(origin, event_id)
class FederationStateServlet(BaseFederationServlet):
PATH = "/state/([^/]*)/"
# This is when someone asks for all data for a given context.
def on_GET(self, origin, content, query, context):
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return self.handler.on_context_state_request(
origin,
context,
query.get("event_id", [None])[0],
)
class FederationBackfillServlet(BaseFederationServlet):
PATH = "/backfill/([^/]*)/"
def on_GET(self, origin, content, query, context):
versions = query["v"]
limits = query["limit"]
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if not limits:
return defer.succeed((400, {"error": "Did not include limit param"}))
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limit = int(limits[-1])
return self.handler.on_backfill_request(origin, context, versions, limit)
class FederationQueryServlet(BaseFederationServlet):
PATH = "/query/([^/]*)"
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# This is when we receive a server-server Query
def on_GET(self, origin, content, query, query_type):
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return self.handler.on_query_request(
query_type,
{k: v[0].decode("utf-8") for k, v in query.items()}
)
class FederationMakeJoinServlet(BaseFederationServlet):
PATH = "/make_join/([^/]*)/([^/]*)"
@defer.inlineCallbacks
def on_GET(self, origin, content, query, context, user_id):
content = yield self.handler.on_make_join_request(context, user_id)
defer.returnValue((200, content))
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class FederationEventAuthServlet(BaseFederationServlet):
PATH = "/event_auth/([^/]*)/([^/]*)"
def on_GET(self, origin, content, query, context, event_id):
return self.handler.on_event_auth(origin, context, event_id)
class FederationSendJoinServlet(BaseFederationServlet):
PATH = "/send_join/([^/]*)/([^/]*)"
@defer.inlineCallbacks
def on_PUT(self, origin, content, query, context, event_id):
# TODO(paul): assert that context/event_id parsed from path actually
# match those given in content
content = yield self.handler.on_send_join_request(origin, content)
defer.returnValue((200, content))
class FederationInviteServlet(BaseFederationServlet):
PATH = "/invite/([^/]*)/([^/]*)"
@defer.inlineCallbacks
def on_PUT(self, origin, content, query, context, event_id):
# TODO(paul): assert that context/event_id parsed from path actually
# match those given in content
content = yield self.handler.on_invite_request(origin, content)
defer.returnValue((200, content))
class FederationQueryAuthServlet(BaseFederationServlet):
PATH = "/query_auth/([^/]*)/([^/]*)"
@defer.inlineCallbacks
def on_POST(self, origin, content, query, context, event_id):
new_content = yield self.handler.on_query_auth_request(
origin, content, event_id
)
defer.returnValue((200, new_content))
class FederationGetMissingEventsServlet(BaseFederationServlet):
# TODO(paul): Why does this path alone end with "/?" optional?
PATH = "/get_missing_events/([^/]*)/?"
@defer.inlineCallbacks
def on_POST(self, origin, content, query, room_id):
limit = int(content.get("limit", 10))
min_depth = int(content.get("min_depth", 0))
earliest_events = content.get("earliest_events", [])
latest_events = content.get("latest_events", [])
content = yield self.handler.on_get_missing_events(
origin,
room_id=room_id,
earliest_events=earliest_events,
latest_events=latest_events,
min_depth=min_depth,
limit=limit,
)
defer.returnValue((200, content))
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SERVLET_CLASSES = (
FederationPullServlet,
FederationEventServlet,
FederationStateServlet,
FederationBackfillServlet,
FederationQueryServlet,
FederationMakeJoinServlet,
FederationEventServlet,
FederationSendJoinServlet,
FederationInviteServlet,
FederationQueryAuthServlet,
FederationGetMissingEventsServlet,
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FederationEventAuthServlet,
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)