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fa7dc889f1
We really shouldn't be sending all CodeMessageExceptions back over the C-S API; it will include things like 401s which we shouldn't proxy. That means that we need to explicitly turn a few HttpResponseExceptions into SynapseErrors in the federation layer. The effect of the latter is that the matrix errcode will get passed through correctly to calling clients, which might help with some of the random M_UNKNOWN errors when trying to join rooms.
376 lines
12 KiB
Python
376 lines
12 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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"""Contains exceptions and error codes."""
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import logging
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from six import iteritems
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from six.moves import http_client
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from canonicaljson import json
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logger = logging.getLogger(__name__)
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class Codes(object):
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UNRECOGNIZED = "M_UNRECOGNIZED"
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UNAUTHORIZED = "M_UNAUTHORIZED"
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FORBIDDEN = "M_FORBIDDEN"
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BAD_JSON = "M_BAD_JSON"
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NOT_JSON = "M_NOT_JSON"
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USER_IN_USE = "M_USER_IN_USE"
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ROOM_IN_USE = "M_ROOM_IN_USE"
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BAD_PAGINATION = "M_BAD_PAGINATION"
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BAD_STATE = "M_BAD_STATE"
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UNKNOWN = "M_UNKNOWN"
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NOT_FOUND = "M_NOT_FOUND"
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MISSING_TOKEN = "M_MISSING_TOKEN"
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UNKNOWN_TOKEN = "M_UNKNOWN_TOKEN"
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GUEST_ACCESS_FORBIDDEN = "M_GUEST_ACCESS_FORBIDDEN"
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LIMIT_EXCEEDED = "M_LIMIT_EXCEEDED"
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CAPTCHA_NEEDED = "M_CAPTCHA_NEEDED"
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CAPTCHA_INVALID = "M_CAPTCHA_INVALID"
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MISSING_PARAM = "M_MISSING_PARAM"
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INVALID_PARAM = "M_INVALID_PARAM"
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TOO_LARGE = "M_TOO_LARGE"
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EXCLUSIVE = "M_EXCLUSIVE"
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THREEPID_AUTH_FAILED = "M_THREEPID_AUTH_FAILED"
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THREEPID_IN_USE = "M_THREEPID_IN_USE"
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THREEPID_NOT_FOUND = "M_THREEPID_NOT_FOUND"
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THREEPID_DENIED = "M_THREEPID_DENIED"
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INVALID_USERNAME = "M_INVALID_USERNAME"
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SERVER_NOT_TRUSTED = "M_SERVER_NOT_TRUSTED"
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CONSENT_NOT_GIVEN = "M_CONSENT_NOT_GIVEN"
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CANNOT_LEAVE_SERVER_NOTICE_ROOM = "M_CANNOT_LEAVE_SERVER_NOTICE_ROOM"
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class CodeMessageException(RuntimeError):
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"""An exception with integer code and message string attributes.
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Attributes:
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code (int): HTTP error code
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msg (str): string describing the error
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"""
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def __init__(self, code, msg):
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super(CodeMessageException, self).__init__("%d: %s" % (code, msg))
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self.code = code
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self.msg = msg
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class MatrixCodeMessageException(CodeMessageException):
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"""An error from a general matrix endpoint, eg. from a proxied Matrix API call.
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Attributes:
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errcode (str): Matrix error code e.g 'M_FORBIDDEN'
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"""
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def __init__(self, code, msg, errcode=Codes.UNKNOWN):
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super(MatrixCodeMessageException, self).__init__(code, msg)
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self.errcode = errcode
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class SynapseError(CodeMessageException):
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"""A base exception type for matrix errors which have an errcode and error
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message (as well as an HTTP status code).
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Attributes:
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errcode (str): Matrix error code e.g 'M_FORBIDDEN'
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"""
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def __init__(self, code, msg, errcode=Codes.UNKNOWN):
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"""Constructs a synapse error.
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Args:
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code (int): The integer error code (an HTTP response code)
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msg (str): The human-readable error message.
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errcode (str): The matrix error code e.g 'M_FORBIDDEN'
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"""
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super(SynapseError, self).__init__(code, msg)
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self.errcode = errcode
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def error_dict(self):
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return cs_error(
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self.msg,
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self.errcode,
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)
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@classmethod
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def from_http_response_exception(cls, err):
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"""Make a SynapseError based on an HTTPResponseException
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This is useful when a proxied request has failed, and we need to
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decide how to map the failure onto a matrix error to send back to the
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client.
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An attempt is made to parse the body of the http response as a matrix
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error. If that succeeds, the errcode and error message from the body
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are used as the errcode and error message in the new synapse error.
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Otherwise, the errcode is set to M_UNKNOWN, and the error message is
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set to the reason code from the HTTP response.
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Args:
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err (HttpResponseException):
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Returns:
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SynapseError:
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"""
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# try to parse the body as json, to get better errcode/msg, but
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# default to M_UNKNOWN with the HTTP status as the error text
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try:
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j = json.loads(err.response)
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except ValueError:
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j = {}
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errcode = j.get('errcode', Codes.UNKNOWN)
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errmsg = j.get('error', err.msg)
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res = SynapseError(err.code, errmsg, errcode)
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return res
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class ConsentNotGivenError(SynapseError):
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"""The error returned to the client when the user has not consented to the
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privacy policy.
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"""
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def __init__(self, msg, consent_uri):
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"""Constructs a ConsentNotGivenError
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Args:
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msg (str): The human-readable error message
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consent_url (str): The URL where the user can give their consent
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"""
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super(ConsentNotGivenError, self).__init__(
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code=http_client.FORBIDDEN,
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msg=msg,
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errcode=Codes.CONSENT_NOT_GIVEN
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)
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self._consent_uri = consent_uri
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def error_dict(self):
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return cs_error(
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self.msg,
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self.errcode,
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consent_uri=self._consent_uri
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)
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class RegistrationError(SynapseError):
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"""An error raised when a registration event fails."""
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pass
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class FederationDeniedError(SynapseError):
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"""An error raised when the server tries to federate with a server which
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is not on its federation whitelist.
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Attributes:
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destination (str): The destination which has been denied
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"""
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def __init__(self, destination):
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"""Raised by federation client or server to indicate that we are
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are deliberately not attempting to contact a given server because it is
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not on our federation whitelist.
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Args:
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destination (str): the domain in question
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"""
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self.destination = destination
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super(FederationDeniedError, self).__init__(
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code=403,
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msg="Federation denied with %s." % (self.destination,),
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errcode=Codes.FORBIDDEN,
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)
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class InteractiveAuthIncompleteError(Exception):
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"""An error raised when UI auth is not yet complete
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(This indicates we should return a 401 with 'result' as the body)
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Attributes:
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result (dict): the server response to the request, which should be
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passed back to the client
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"""
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def __init__(self, result):
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super(InteractiveAuthIncompleteError, self).__init__(
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"Interactive auth not yet complete",
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)
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self.result = result
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class UnrecognizedRequestError(SynapseError):
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"""An error indicating we don't understand the request you're trying to make"""
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def __init__(self, *args, **kwargs):
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if "errcode" not in kwargs:
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kwargs["errcode"] = Codes.UNRECOGNIZED
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message = None
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if len(args) == 0:
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message = "Unrecognized request"
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else:
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message = args[0]
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super(UnrecognizedRequestError, self).__init__(
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400,
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message,
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**kwargs
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)
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class NotFoundError(SynapseError):
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"""An error indicating we can't find the thing you asked for"""
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def __init__(self, msg="Not found", errcode=Codes.NOT_FOUND):
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super(NotFoundError, self).__init__(
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404,
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msg,
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errcode=errcode
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)
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class AuthError(SynapseError):
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"""An error raised when there was a problem authorising an event."""
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def __init__(self, *args, **kwargs):
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if "errcode" not in kwargs:
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kwargs["errcode"] = Codes.FORBIDDEN
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super(AuthError, self).__init__(*args, **kwargs)
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class EventSizeError(SynapseError):
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"""An error raised when an event is too big."""
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def __init__(self, *args, **kwargs):
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if "errcode" not in kwargs:
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kwargs["errcode"] = Codes.TOO_LARGE
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super(EventSizeError, self).__init__(413, *args, **kwargs)
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class EventStreamError(SynapseError):
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"""An error raised when there a problem with the event stream."""
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def __init__(self, *args, **kwargs):
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if "errcode" not in kwargs:
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kwargs["errcode"] = Codes.BAD_PAGINATION
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super(EventStreamError, self).__init__(*args, **kwargs)
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class LoginError(SynapseError):
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"""An error raised when there was a problem logging in."""
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pass
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class StoreError(SynapseError):
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"""An error raised when there was a problem storing some data."""
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pass
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class InvalidCaptchaError(SynapseError):
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def __init__(self, code=400, msg="Invalid captcha.", error_url=None,
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errcode=Codes.CAPTCHA_INVALID):
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super(InvalidCaptchaError, self).__init__(code, msg, errcode)
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self.error_url = error_url
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def error_dict(self):
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return cs_error(
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self.msg,
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self.errcode,
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error_url=self.error_url,
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)
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class LimitExceededError(SynapseError):
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"""A client has sent too many requests and is being throttled.
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"""
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def __init__(self, code=429, msg="Too Many Requests", retry_after_ms=None,
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errcode=Codes.LIMIT_EXCEEDED):
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super(LimitExceededError, self).__init__(code, msg, errcode)
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self.retry_after_ms = retry_after_ms
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def error_dict(self):
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return cs_error(
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self.msg,
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self.errcode,
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retry_after_ms=self.retry_after_ms,
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)
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def cs_error(msg, code=Codes.UNKNOWN, **kwargs):
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""" Utility method for constructing an error response for client-server
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interactions.
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Args:
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msg (str): The error message.
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code (str): The error code.
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kwargs : Additional keys to add to the response.
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Returns:
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A dict representing the error response JSON.
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"""
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err = {"error": msg, "errcode": code}
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for key, value in iteritems(kwargs):
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err[key] = value
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return err
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class FederationError(RuntimeError):
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""" This class is used to inform remote home servers about erroneous
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PDUs they sent us.
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FATAL: The remote server could not interpret the source event.
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(e.g., it was missing a required field)
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ERROR: The remote server interpreted the event, but it failed some other
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check (e.g. auth)
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WARN: The remote server accepted the event, but believes some part of it
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is wrong (e.g., it referred to an invalid event)
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"""
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def __init__(self, level, code, reason, affected, source=None):
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if level not in ["FATAL", "ERROR", "WARN"]:
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raise ValueError("Level is not valid: %s" % (level,))
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self.level = level
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self.code = code
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self.reason = reason
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self.affected = affected
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self.source = source
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msg = "%s %s: %s" % (level, code, reason,)
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super(FederationError, self).__init__(msg)
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def get_dict(self):
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return {
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"level": self.level,
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"code": self.code,
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"reason": self.reason,
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"affected": self.affected,
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"source": self.source if self.source else self.affected,
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}
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class HttpResponseException(CodeMessageException):
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"""
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Represents an HTTP-level failure of an outbound request
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Attributes:
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response (str): body of response
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"""
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def __init__(self, code, msg, response):
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"""
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Args:
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code (int): HTTP status code
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msg (str): reason phrase from HTTP response status line
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response (str): body of response
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"""
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super(HttpResponseException, self).__init__(code, msg)
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self.response = response
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