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114 lines
4.0 KiB
Python
114 lines
4.0 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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""" This module contains base REST classes for constructing REST servlets. """
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from synapse.api.errors import SynapseError
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import logging
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logger = logging.getLogger(__name__)
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class RestServlet(object):
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""" A Synapse REST Servlet.
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An implementing class can either provide its own custom 'register' method,
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or use the automatic pattern handling provided by the base class.
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To use this latter, the implementing class instead provides a `PATTERN`
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class attribute containing a pre-compiled regular expression. The automatic
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register method will then use this method to register any of the following
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instance methods associated with the corresponding HTTP method:
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on_GET
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on_PUT
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on_POST
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on_DELETE
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on_OPTIONS
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Automatically handles turning CodeMessageExceptions thrown by these methods
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into the appropriate HTTP response.
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"""
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def register(self, http_server):
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""" Register this servlet with the given HTTP server. """
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if hasattr(self, "PATTERN"):
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pattern = self.PATTERN
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for method in ("GET", "PUT", "POST", "OPTIONS", "DELETE"):
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if hasattr(self, "on_%s" % (method,)):
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method_handler = getattr(self, "on_%s" % (method,))
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http_server.register_path(method, pattern, method_handler)
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else:
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raise NotImplementedError("RestServlet must register something.")
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@staticmethod
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def parse_integer(request, name, default=None, required=False):
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if name in request.args:
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try:
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return int(request.args[name][0])
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except:
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message = "Query parameter %r must be an integer" % (name,)
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raise SynapseError(400, message)
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else:
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if required:
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message = "Missing integer query parameter %r" % (name,)
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raise SynapseError(400, message)
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else:
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return default
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@staticmethod
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def parse_boolean(request, name, default=None, required=False):
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if name in request.args:
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try:
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return {
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"true": True,
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"false": False,
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}[request.args[name][0]]
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except:
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message = (
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"Boolean query parameter %r must be one of"
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" ['true', 'false']"
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) % (name,)
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raise SynapseError(400, message)
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else:
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if required:
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message = "Missing boolean query parameter %r" % (name,)
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raise SynapseError(400, message)
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else:
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return default
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@staticmethod
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def parse_string(request, name, default=None, required=False,
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allowed_values=None, param_type="string"):
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if name in request.args:
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value = request.args[name][0]
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if allowed_values is not None and value not in allowed_values:
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message = "Query parameter %r must be one of [%s]" % (
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name, ", ".join(repr(v) for v in allowed_values)
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)
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raise SynapseError(message)
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else:
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return value
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else:
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if required:
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message = "Missing %s query parameter %r" % (param_type, name)
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raise SynapseError(400, message)
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else:
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return default
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