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