forked-synapse/synapse/http/servlet.py

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# -*- coding: utf-8 -*-
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# 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.
""" This module contains base REST classes for constructing REST servlets. """
import logging
from canonicaljson import json
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from synapse.api.errors import Codes, SynapseError
logger = logging.getLogger(__name__)
def parse_integer(request, name, default=None, required=False):
"""Parse an integer parameter from the request string
Args:
request: the twisted HTTP request.
name (bytes/unicode): the name of the query parameter.
default (int|None): value to use if the parameter is absent, defaults
to None.
required (bool): whether to raise a 400 SynapseError if the
parameter is absent, defaults to False.
Returns:
int|None: An int value or the default.
Raises:
SynapseError: if the parameter is absent and required, or if the
parameter is present and not an integer.
"""
return parse_integer_from_args(request.args, name, default, required)
def parse_integer_from_args(args, name, default=None, required=False):
if not isinstance(name, bytes):
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name = name.encode("ascii")
if name in args:
try:
return int(args[name][0])
except Exception:
message = "Query parameter %r must be an integer" % (name,)
raise SynapseError(400, message, errcode=Codes.INVALID_PARAM)
else:
if required:
message = "Missing integer query parameter %r" % (name,)
raise SynapseError(400, message, errcode=Codes.MISSING_PARAM)
else:
return default
def parse_boolean(request, name, default=None, required=False):
"""Parse a boolean parameter from the request query string
Args:
request: the twisted HTTP request.
name (bytes/unicode): the name of the query parameter.
default (bool|None): value to use if the parameter is absent, defaults
to None.
required (bool): whether to raise a 400 SynapseError if the
parameter is absent, defaults to False.
Returns:
bool|None: A bool value or the default.
Raises:
SynapseError: if the parameter is absent and required, or if the
parameter is present and not one of "true" or "false".
"""
return parse_boolean_from_args(request.args, name, default, required)
def parse_boolean_from_args(args, name, default=None, required=False):
if not isinstance(name, bytes):
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name = name.encode("ascii")
if name in args:
try:
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return {b"true": True, b"false": False}[args[name][0]]
except Exception:
message = (
"Boolean query parameter %r must be one of ['true', 'false']"
) % (name,)
raise SynapseError(400, message)
else:
if required:
message = "Missing boolean query parameter %r" % (name,)
raise SynapseError(400, message, errcode=Codes.MISSING_PARAM)
else:
return default
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def parse_string(
request,
name,
default=None,
required=False,
allowed_values=None,
param_type="string",
encoding="ascii",
):
"""
Parse a string parameter from the request query string.
If encoding is not None, the content of the query param will be
decoded to Unicode using the encoding, otherwise it will be encoded
Args:
request: the twisted HTTP request.
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name (bytes|unicode): the name of the query parameter.
default (bytes|unicode|None): value to use if the parameter is absent,
defaults to None. Must be bytes if encoding is None.
required (bool): whether to raise a 400 SynapseError if the
parameter is absent, defaults to False.
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allowed_values (list[bytes|unicode]): List of allowed values for the
string, or None if any value is allowed, defaults to None. Must be
the same type as name, if given.
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encoding (str|None): The encoding to decode the string content with.
Returns:
bytes/unicode|None: A string value or the default. Unicode if encoding
was given, bytes otherwise.
Raises:
SynapseError if the parameter is absent and required, or if the
parameter is present, must be one of a list of allowed values and
is not one of those allowed values.
"""
return parse_string_from_args(
request.args, name, default, required, allowed_values, param_type, encoding
)
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def parse_string_from_args(
args,
name,
default=None,
required=False,
allowed_values=None,
param_type="string",
encoding="ascii",
):
if not isinstance(name, bytes):
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name = name.encode("ascii")
if name in args:
value = args[name][0]
if encoding:
try:
value = value.decode(encoding)
except ValueError:
raise SynapseError(
400, "Query parameter %r must be %s" % (name, encoding)
)
if allowed_values is not None and value not in allowed_values:
message = "Query parameter %r must be one of [%s]" % (
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name,
", ".join(repr(v) for v in allowed_values),
)
raise SynapseError(400, message)
else:
return value
else:
if required:
message = "Missing %s query parameter %r" % (param_type, name)
raise SynapseError(400, message, errcode=Codes.MISSING_PARAM)
else:
if encoding and isinstance(default, bytes):
return default.decode(encoding)
return default
def parse_json_value_from_request(request, allow_empty_body=False):
"""Parse a JSON value from the body of a twisted HTTP request.
Args:
request: the twisted HTTP request.
allow_empty_body (bool): if True, an empty body will be accepted and
turned into None
Returns:
The JSON value.
Raises:
SynapseError if the request body couldn't be decoded as JSON.
"""
try:
content_bytes = request.content.read()
except Exception:
raise SynapseError(400, "Error reading JSON content.")
if not content_bytes and allow_empty_body:
return None
# Decode to Unicode so that simplejson will return Unicode strings on
# Python 2
try:
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content_unicode = content_bytes.decode("utf8")
except UnicodeDecodeError:
logger.warning("Unable to decode UTF-8")
raise SynapseError(400, "Content not JSON.", errcode=Codes.NOT_JSON)
try:
content = json.loads(content_unicode)
except Exception as e:
logger.warning("Unable to parse JSON: %s", e)
raise SynapseError(400, "Content not JSON.", errcode=Codes.NOT_JSON)
return content
def parse_json_object_from_request(request, allow_empty_body=False):
"""Parse a JSON object from the body of a twisted HTTP request.
Args:
request: the twisted HTTP request.
allow_empty_body (bool): if True, an empty body will be accepted and
turned into an empty dict.
Raises:
SynapseError if the request body couldn't be decoded as JSON or
if it wasn't a JSON object.
"""
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content = parse_json_value_from_request(request, allow_empty_body=allow_empty_body)
if allow_empty_body and content is None:
return {}
if type(content) != dict:
message = "Content must be a JSON object."
raise SynapseError(400, message, errcode=Codes.BAD_JSON)
return content
def assert_params_in_dict(body, required):
absent = []
for k in required:
if k not in body:
absent.append(k)
if len(absent) > 0:
raise SynapseError(400, "Missing params: %r" % absent, Codes.MISSING_PARAM)
class RestServlet(object):
""" A Synapse REST Servlet.
An implementing class can either provide its own custom 'register' method,
or use the automatic pattern handling provided by the base class.
To use this latter, the implementing class instead provides a `PATTERN`
class attribute containing a pre-compiled regular expression. The automatic
register method will then use this method to register any of the following
instance methods associated with the corresponding HTTP method:
on_GET
on_PUT
on_POST
on_DELETE
on_OPTIONS
Automatically handles turning CodeMessageExceptions thrown by these methods
into the appropriate HTTP response.
"""
def register(self, http_server):
""" Register this servlet with the given HTTP server. """
if hasattr(self, "PATTERNS"):
patterns = self.PATTERNS
for method in ("GET", "PUT", "POST", "OPTIONS", "DELETE"):
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if hasattr(self, "on_%s" % (method,)):
servlet_classname = self.__class__.__name__
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method_handler = getattr(self, "on_%s" % (method,))
Add basic opentracing support (#5544) * Configure and initialise tracer Includes config options for the tracer and sets up JaegerClient. * Scope manager using LogContexts We piggy-back our tracer scopes by using log context. The current log context gives us the current scope. If new scope is created we create a stack of scopes in the context. * jaeger is a dependency now * Carrier inject and extraction for Twisted Headers * Trace federation requests on the way in and out. The span is created in _started_processing and closed in _finished_processing because we need a meaningful log context. * Create logcontext for new scope. Instead of having a stack of scopes in a logcontext we create a new context for a new scope if the current logcontext already has a scope. * Remove scope from logcontext if logcontext is top level * Disable tracer if not configured * typo * Remove dependence on jaeger internals * bools * Set service name * :Explicitely state that the tracer is disabled * Black is the new black * Newsfile * Code style * Use the new config setup. * Generate config. * Copyright * Rename config to opentracing * Remove user whitelisting * Empty whitelist by default * User ConfigError instead of RuntimeError * Use isinstance * Use tag constants for opentracing. * Remove debug comment and no need to explicitely record error * Two errors a "s(c)entry" * Docstrings! * Remove debugging brainslip * Homeserver Whitlisting * Better opentracing config comment * linting * Inclue worker name in service_name * Make opentracing an optional dependency * Neater config retreival * Clean up dummy tags * Instantiate tracing as object instead of global class * Inlcude opentracing as a homeserver member. * Thread opentracing to the request level * Reference opetnracing through hs * Instantiate dummy opentracin g for tests. * About to revert, just keeping the unfinished changes just in case * Revert back to global state, commit number: 9ce4a3d9067bf9889b86c360c05ac88618b85c4f * Use class level methods in tracerutils * Start and stop requests spans in a place where we have access to the authenticated entity * Seen it, isort it * Make sure to close the active span. * I'm getting black and blue from this. * Logger formatting Co-Authored-By: Erik Johnston <erik@matrix.org> * Outdated comment * Import opentracing at the top * Return a contextmanager * Start tracing client requests from the servlet * Return noop context manager if not tracing * Explicitely say that these are federation requests * Include servlet name in client requests * Use context manager * Move opentracing to logging/ * Seen it, isort it again! * Ignore twisted return exceptions on context exit * Escape the scope * Scopes should be entered to make them useful. * Nicer decorator names * Just one init, init? * Don't need to close something that isn't open * Docs make you smarter
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http_server.register_paths(
method, patterns, method_handler, servlet_classname
Add basic opentracing support (#5544) * Configure and initialise tracer Includes config options for the tracer and sets up JaegerClient. * Scope manager using LogContexts We piggy-back our tracer scopes by using log context. The current log context gives us the current scope. If new scope is created we create a stack of scopes in the context. * jaeger is a dependency now * Carrier inject and extraction for Twisted Headers * Trace federation requests on the way in and out. The span is created in _started_processing and closed in _finished_processing because we need a meaningful log context. * Create logcontext for new scope. Instead of having a stack of scopes in a logcontext we create a new context for a new scope if the current logcontext already has a scope. * Remove scope from logcontext if logcontext is top level * Disable tracer if not configured * typo * Remove dependence on jaeger internals * bools * Set service name * :Explicitely state that the tracer is disabled * Black is the new black * Newsfile * Code style * Use the new config setup. * Generate config. * Copyright * Rename config to opentracing * Remove user whitelisting * Empty whitelist by default * User ConfigError instead of RuntimeError * Use isinstance * Use tag constants for opentracing. * Remove debug comment and no need to explicitely record error * Two errors a "s(c)entry" * Docstrings! * Remove debugging brainslip * Homeserver Whitlisting * Better opentracing config comment * linting * Inclue worker name in service_name * Make opentracing an optional dependency * Neater config retreival * Clean up dummy tags * Instantiate tracing as object instead of global class * Inlcude opentracing as a homeserver member. * Thread opentracing to the request level * Reference opetnracing through hs * Instantiate dummy opentracin g for tests. * About to revert, just keeping the unfinished changes just in case * Revert back to global state, commit number: 9ce4a3d9067bf9889b86c360c05ac88618b85c4f * Use class level methods in tracerutils * Start and stop requests spans in a place where we have access to the authenticated entity * Seen it, isort it * Make sure to close the active span. * I'm getting black and blue from this. * Logger formatting Co-Authored-By: Erik Johnston <erik@matrix.org> * Outdated comment * Import opentracing at the top * Return a contextmanager * Start tracing client requests from the servlet * Return noop context manager if not tracing * Explicitely say that these are federation requests * Include servlet name in client requests * Use context manager * Move opentracing to logging/ * Seen it, isort it again! * Ignore twisted return exceptions on context exit * Escape the scope * Scopes should be entered to make them useful. * Nicer decorator names * Just one init, init? * Don't need to close something that isn't open * Docs make you smarter
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)
else:
raise NotImplementedError("RestServlet must register something.")