diff options
Diffstat (limited to '')
| -rw-r--r-- | synapse/http/servlet.py | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/synapse/http/servlet.py b/synapse/http/servlet.py new file mode 100644 index 0000000000..a4eb6c817c --- /dev/null +++ b/synapse/http/servlet.py @@ -0,0 +1,113 @@ +# -*- coding: utf-8 -*- +# Copyright 2014, 2015 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. """ + +from synapse.api.errors import SynapseError + +import logging + + +logger = logging.getLogger(__name__) + + +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, "PATTERN"): + pattern = self.PATTERN + + for method in ("GET", "PUT", "POST", "OPTIONS", "DELETE"): + if hasattr(self, "on_%s" % (method)): + method_handler = getattr(self, "on_%s" % (method)) + http_server.register_path(method, pattern, method_handler) + else: + raise NotImplementedError("RestServlet must register something.") + + @staticmethod + def parse_integer(request, name, default=None, required=False): + if name in request.args: + try: + return int(request.args[name][0]) + except: + message = "Query parameter %r must be an integer" % (name,) + raise SynapseError(400, message) + else: + if required: + message = "Missing integer query parameter %r" % (name,) + raise SynapseError(400, message) + else: + return default + + @staticmethod + def parse_boolean(request, name, default=None, required=False): + if name in request.args: + try: + return { + "true": True, + "false": False, + }[request.args[name][0]] + except: + 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) + else: + return default + + @staticmethod + def parse_string(request, name, default=None, required=False, + allowed_values=None, param_type="string"): + if name in request.args: + value = request.args[name][0] + if allowed_values is not None and value not in allowed_values: + message = "Query parameter %r must be one of [%s]" % ( + name, ", ".join(repr(v) for v in allowed_values) + ) + raise SynapseError(message) + else: + return value + else: + if required: + message = "Missing %s query parameter %r" % (param_type, name) + raise SynapseError(400, message) + else: + return default |