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# Copyright 2017 gRPC authors.
#
# 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.
"""Interceptor that ensures a specific header is present."""
import grpc
def _unary_unary_rpc_terminator(code, details):
def terminate(ignored_request, context):
context.abort(code, details)
return grpc.unary_unary_rpc_method_handler(terminate)
class RequestHeaderValidatorInterceptor(grpc.ServerInterceptor):
def __init__(self, header, value, code, details):
self._header = header
self._value = value
self._terminator = _unary_unary_rpc_terminator(code, details)
def intercept_service(self, continuation, handler_call_details):
if (self._header,
self._value) in handler_call_details.invocation_metadata:
return continuation(handler_call_details)
else:
return self._terminator
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