420 lines
15 KiB
Python
420 lines
15 KiB
Python
# -*- coding: utf-8 -*-
|
|
# Copyright 2014-2016 OpenMarket Ltd
|
|
# Copyright 2018 New Vector 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 synapse.api.errors import (
|
|
cs_exception, SynapseError, CodeMessageException, UnrecognizedRequestError, Codes
|
|
)
|
|
from synapse.http.request_metrics import (
|
|
requests_counter,
|
|
)
|
|
from synapse.util.logcontext import LoggingContext, PreserveLoggingContext
|
|
from synapse.util.caches import intern_dict
|
|
from synapse.util.metrics import Measure
|
|
import synapse.metrics
|
|
import synapse.events
|
|
|
|
from canonicaljson import (
|
|
encode_canonical_json, encode_pretty_printed_json
|
|
)
|
|
|
|
from twisted.internet import defer
|
|
from twisted.python import failure
|
|
from twisted.web import server, resource
|
|
from twisted.web.server import NOT_DONE_YET
|
|
from twisted.web.util import redirectTo
|
|
|
|
import collections
|
|
import logging
|
|
import urllib
|
|
import simplejson
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
def wrap_json_request_handler(h):
|
|
"""Wraps a request handler method with exception handling.
|
|
|
|
Also adds logging as per wrap_request_handler_with_logging.
|
|
|
|
The handler method must have a signature of "handle_foo(self, request)",
|
|
where "self" must have a "clock" attribute (and "request" must be a
|
|
SynapseRequest).
|
|
|
|
The handler must return a deferred. If the deferred succeeds we assume that
|
|
a response has been sent. If the deferred fails with a SynapseError we use
|
|
it to send a JSON response with the appropriate HTTP reponse code. If the
|
|
deferred fails with any other type of error we send a 500 reponse.
|
|
"""
|
|
|
|
@defer.inlineCallbacks
|
|
def wrapped_request_handler(self, request):
|
|
try:
|
|
yield h(self, request)
|
|
except CodeMessageException as e:
|
|
code = e.code
|
|
if isinstance(e, SynapseError):
|
|
logger.info(
|
|
"%s SynapseError: %s - %s", request, code, e.msg
|
|
)
|
|
else:
|
|
logger.exception(e)
|
|
respond_with_json(
|
|
request, code, cs_exception(e), send_cors=True,
|
|
pretty_print=_request_user_agent_is_curl(request),
|
|
)
|
|
|
|
except Exception:
|
|
# failure.Failure() fishes the original Failure out
|
|
# of our stack, and thus gives us a sensible stack
|
|
# trace.
|
|
f = failure.Failure()
|
|
logger.error(
|
|
"Failed handle request via %r: %r: %s",
|
|
h,
|
|
request,
|
|
f.getTraceback().rstrip(),
|
|
)
|
|
respond_with_json(
|
|
request,
|
|
500,
|
|
{
|
|
"error": "Internal server error",
|
|
"errcode": Codes.UNKNOWN,
|
|
},
|
|
send_cors=True,
|
|
pretty_print=_request_user_agent_is_curl(request),
|
|
)
|
|
|
|
return wrap_request_handler_with_logging(wrapped_request_handler)
|
|
|
|
|
|
def wrap_request_handler_with_logging(h):
|
|
"""Wraps a request handler to provide logging and metrics
|
|
|
|
The handler method must have a signature of "handle_foo(self, request)",
|
|
where "self" must have a "clock" attribute (and "request" must be a
|
|
SynapseRequest).
|
|
|
|
As well as calling `request.processing` (which will log the response and
|
|
duration for this request), the wrapped request handler will insert the
|
|
request id into the logging context.
|
|
"""
|
|
@defer.inlineCallbacks
|
|
def wrapped_request_handler(self, request):
|
|
"""
|
|
Args:
|
|
self:
|
|
request (synapse.http.site.SynapseRequest):
|
|
"""
|
|
|
|
request_id = request.get_request_id()
|
|
with LoggingContext(request_id) as request_context:
|
|
request_context.request = request_id
|
|
with Measure(self.clock, "wrapped_request_handler"):
|
|
# we start the request metrics timer here with an initial stab
|
|
# at the servlet name. For most requests that name will be
|
|
# JsonResource (or a subclass), and JsonResource._async_render
|
|
# will update it once it picks a servlet.
|
|
servlet_name = self.__class__.__name__
|
|
with request.processing(servlet_name):
|
|
with PreserveLoggingContext(request_context):
|
|
d = h(self, request)
|
|
|
|
# record the arrival of the request *after*
|
|
# dispatching to the handler, so that the handler
|
|
# can update the servlet name in the request
|
|
# metrics
|
|
requests_counter.inc(request.method,
|
|
request.request_metrics.name)
|
|
yield d
|
|
return wrapped_request_handler
|
|
|
|
|
|
class HttpServer(object):
|
|
""" Interface for registering callbacks on a HTTP server
|
|
"""
|
|
|
|
def register_paths(self, method, path_patterns, callback):
|
|
""" Register a callback that gets fired if we receive a http request
|
|
with the given method for a path that matches the given regex.
|
|
|
|
If the regex contains groups these gets passed to the calback via
|
|
an unpacked tuple.
|
|
|
|
Args:
|
|
method (str): The method to listen to.
|
|
path_patterns (list<SRE_Pattern>): The regex used to match requests.
|
|
callback (function): The function to fire if we receive a matched
|
|
request. The first argument will be the request object and
|
|
subsequent arguments will be any matched groups from the regex.
|
|
This should return a tuple of (code, response).
|
|
"""
|
|
pass
|
|
|
|
|
|
class JsonResource(HttpServer, resource.Resource):
|
|
""" This implements the HttpServer interface and provides JSON support for
|
|
Resources.
|
|
|
|
Register callbacks via register_paths()
|
|
|
|
Callbacks can return a tuple of status code and a dict in which case the
|
|
the dict will automatically be sent to the client as a JSON object.
|
|
|
|
The JsonResource is primarily intended for returning JSON, but callbacks
|
|
may send something other than JSON, they may do so by using the methods
|
|
on the request object and instead returning None.
|
|
"""
|
|
|
|
isLeaf = True
|
|
|
|
_PathEntry = collections.namedtuple("_PathEntry", ["pattern", "callback"])
|
|
|
|
def __init__(self, hs, canonical_json=True):
|
|
resource.Resource.__init__(self)
|
|
|
|
self.canonical_json = canonical_json
|
|
self.clock = hs.get_clock()
|
|
self.path_regexs = {}
|
|
self.hs = hs
|
|
|
|
def register_paths(self, method, path_patterns, callback):
|
|
for path_pattern in path_patterns:
|
|
logger.debug("Registering for %s %s", method, path_pattern.pattern)
|
|
self.path_regexs.setdefault(method, []).append(
|
|
self._PathEntry(path_pattern, callback)
|
|
)
|
|
|
|
def render(self, request):
|
|
""" This gets called by twisted every time someone sends us a request.
|
|
"""
|
|
self._async_render(request)
|
|
return server.NOT_DONE_YET
|
|
|
|
@wrap_json_request_handler
|
|
@defer.inlineCallbacks
|
|
def _async_render(self, request):
|
|
""" This gets called from render() every time someone sends us a request.
|
|
This checks if anyone has registered a callback for that method and
|
|
path.
|
|
"""
|
|
callback, group_dict = self._get_handler_for_request(request)
|
|
|
|
servlet_instance = getattr(callback, "__self__", None)
|
|
if servlet_instance is not None:
|
|
servlet_classname = servlet_instance.__class__.__name__
|
|
else:
|
|
servlet_classname = "%r" % callback
|
|
request.request_metrics.name = servlet_classname
|
|
|
|
# Now trigger the callback. If it returns a response, we send it
|
|
# here. If it throws an exception, that is handled by the wrapper
|
|
# installed by @request_handler.
|
|
|
|
kwargs = intern_dict({
|
|
name: urllib.unquote(value).decode("UTF-8") if value else value
|
|
for name, value in group_dict.items()
|
|
})
|
|
|
|
callback_return = yield callback(request, **kwargs)
|
|
if callback_return is not None:
|
|
code, response = callback_return
|
|
self._send_response(request, code, response)
|
|
|
|
def _get_handler_for_request(self, request):
|
|
"""Finds a callback method to handle the given request
|
|
|
|
Args:
|
|
request (twisted.web.http.Request):
|
|
|
|
Returns:
|
|
Tuple[Callable, dict[str, str]]: callback method, and the dict
|
|
mapping keys to path components as specified in the handler's
|
|
path match regexp.
|
|
|
|
The callback will normally be a method registered via
|
|
register_paths, so will return (possibly via Deferred) either
|
|
None, or a tuple of (http code, response body).
|
|
"""
|
|
if request.method == b"OPTIONS":
|
|
return _options_handler, {}
|
|
|
|
# Loop through all the registered callbacks to check if the method
|
|
# and path regex match
|
|
for path_entry in self.path_regexs.get(request.method, []):
|
|
m = path_entry.pattern.match(request.path)
|
|
if m:
|
|
# We found a match!
|
|
return path_entry.callback, m.groupdict()
|
|
|
|
# Huh. No one wanted to handle that? Fiiiiiine. Send 400.
|
|
return _unrecognised_request_handler, {}
|
|
|
|
def _send_response(self, request, code, response_json_object,
|
|
response_code_message=None):
|
|
# TODO: Only enable CORS for the requests that need it.
|
|
respond_with_json(
|
|
request, code, response_json_object,
|
|
send_cors=True,
|
|
response_code_message=response_code_message,
|
|
pretty_print=_request_user_agent_is_curl(request),
|
|
canonical_json=self.canonical_json,
|
|
)
|
|
|
|
|
|
def _options_handler(request):
|
|
"""Request handler for OPTIONS requests
|
|
|
|
This is a request handler suitable for return from
|
|
_get_handler_for_request. It returns a 200 and an empty body.
|
|
|
|
Args:
|
|
request (twisted.web.http.Request):
|
|
|
|
Returns:
|
|
Tuple[int, dict]: http code, response body.
|
|
"""
|
|
return 200, {}
|
|
|
|
|
|
def _unrecognised_request_handler(request):
|
|
"""Request handler for unrecognised requests
|
|
|
|
This is a request handler suitable for return from
|
|
_get_handler_for_request. It actually just raises an
|
|
UnrecognizedRequestError.
|
|
|
|
Args:
|
|
request (twisted.web.http.Request):
|
|
"""
|
|
raise UnrecognizedRequestError()
|
|
|
|
|
|
class RootRedirect(resource.Resource):
|
|
"""Redirects the root '/' path to another path."""
|
|
|
|
def __init__(self, path):
|
|
resource.Resource.__init__(self)
|
|
self.url = path
|
|
|
|
def render_GET(self, request):
|
|
return redirectTo(self.url, request)
|
|
|
|
def getChild(self, name, request):
|
|
if len(name) == 0:
|
|
return self # select ourselves as the child to render
|
|
return resource.Resource.getChild(self, name, request)
|
|
|
|
|
|
def respond_with_json(request, code, json_object, send_cors=False,
|
|
response_code_message=None, pretty_print=False,
|
|
canonical_json=True):
|
|
# could alternatively use request.notifyFinish() and flip a flag when
|
|
# the Deferred fires, but since the flag is RIGHT THERE it seems like
|
|
# a waste.
|
|
if request._disconnected:
|
|
logger.warn(
|
|
"Not sending response to request %s, already disconnected.",
|
|
request)
|
|
return
|
|
|
|
if pretty_print:
|
|
json_bytes = encode_pretty_printed_json(json_object) + "\n"
|
|
else:
|
|
if canonical_json or synapse.events.USE_FROZEN_DICTS:
|
|
json_bytes = encode_canonical_json(json_object)
|
|
else:
|
|
json_bytes = simplejson.dumps(json_object)
|
|
|
|
return respond_with_json_bytes(
|
|
request, code, json_bytes,
|
|
send_cors=send_cors,
|
|
response_code_message=response_code_message,
|
|
)
|
|
|
|
|
|
def respond_with_json_bytes(request, code, json_bytes, send_cors=False,
|
|
response_code_message=None):
|
|
"""Sends encoded JSON in response to the given request.
|
|
|
|
Args:
|
|
request (twisted.web.http.Request): The http request to respond to.
|
|
code (int): The HTTP response code.
|
|
json_bytes (bytes): The json bytes to use as the response body.
|
|
send_cors (bool): Whether to send Cross-Origin Resource Sharing headers
|
|
http://www.w3.org/TR/cors/
|
|
Returns:
|
|
twisted.web.server.NOT_DONE_YET"""
|
|
|
|
request.setResponseCode(code, message=response_code_message)
|
|
request.setHeader(b"Content-Type", b"application/json")
|
|
request.setHeader(b"Content-Length", b"%d" % (len(json_bytes),))
|
|
request.setHeader(b"Cache-Control", b"no-cache, no-store, must-revalidate")
|
|
|
|
if send_cors:
|
|
set_cors_headers(request)
|
|
|
|
request.write(json_bytes)
|
|
finish_request(request)
|
|
return NOT_DONE_YET
|
|
|
|
|
|
def set_cors_headers(request):
|
|
"""Set the CORs headers so that javascript running in a web browsers can
|
|
use this API
|
|
|
|
Args:
|
|
request (twisted.web.http.Request): The http request to add CORs to.
|
|
"""
|
|
request.setHeader("Access-Control-Allow-Origin", "*")
|
|
request.setHeader(
|
|
"Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS"
|
|
)
|
|
request.setHeader(
|
|
"Access-Control-Allow-Headers",
|
|
"Origin, X-Requested-With, Content-Type, Accept, Authorization"
|
|
)
|
|
|
|
|
|
def finish_request(request):
|
|
""" Finish writing the response to the request.
|
|
|
|
Twisted throws a RuntimeException if the connection closed before the
|
|
response was written but doesn't provide a convenient or reliable way to
|
|
determine if the connection was closed. So we catch and log the RuntimeException
|
|
|
|
You might think that ``request.notifyFinish`` could be used to tell if the
|
|
request was finished. However the deferred it returns won't fire if the
|
|
connection was already closed, meaning we'd have to have called the method
|
|
right at the start of the request. By the time we want to write the response
|
|
it will already be too late.
|
|
"""
|
|
try:
|
|
request.finish()
|
|
except RuntimeError as e:
|
|
logger.info("Connection disconnected before response was written: %r", e)
|
|
|
|
|
|
def _request_user_agent_is_curl(request):
|
|
user_agents = request.requestHeaders.getRawHeaders(
|
|
b"User-Agent", default=[]
|
|
)
|
|
for user_agent in user_agents:
|
|
if b"curl" in user_agent:
|
|
return True
|
|
return False
|