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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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106 lines
3.4 KiB
106 lines
3.4 KiB
# Copyright 2020 The gRPC Authors |
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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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"""Server of the Python AsyncIO example of customizing authentication mechanism.""" |
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import argparse |
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import asyncio |
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import logging |
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from typing import Awaitable, Callable, Tuple |
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import _credentials |
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import grpc |
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helloworld_pb2, helloworld_pb2_grpc = grpc.protos_and_services( |
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"helloworld.proto" |
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) |
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_LOGGER = logging.getLogger(__name__) |
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_LOGGER.setLevel(logging.INFO) |
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_LISTEN_ADDRESS_TEMPLATE = "localhost:%d" |
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_SIGNATURE_HEADER_KEY = "x-signature" |
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class SignatureValidationInterceptor(grpc.aio.ServerInterceptor): |
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def __init__(self): |
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def abort(ignored_request, context: grpc.aio.ServicerContext) -> None: |
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context.abort(grpc.StatusCode.UNAUTHENTICATED, "Invalid signature") |
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self._abort_handler = grpc.unary_unary_rpc_method_handler(abort) |
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async def intercept_service( |
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self, |
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continuation: Callable[ |
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[grpc.HandlerCallDetails], Awaitable[grpc.RpcMethodHandler] |
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], |
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handler_call_details: grpc.HandlerCallDetails, |
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) -> grpc.RpcMethodHandler: |
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# Example HandlerCallDetails object: |
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# _HandlerCallDetails( |
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# method=u'/helloworld.Greeter/SayHello', |
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# invocation_metadata=...) |
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method_name = handler_call_details.method.split("/")[-1] |
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expected_metadata = (_SIGNATURE_HEADER_KEY, method_name[::-1]) |
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if expected_metadata in handler_call_details.invocation_metadata: |
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return await continuation(handler_call_details) |
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else: |
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return self._abort_handler |
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class SimpleGreeter(helloworld_pb2_grpc.GreeterServicer): |
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async def SayHello( |
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self, request: helloworld_pb2.HelloRequest, unused_context |
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) -> helloworld_pb2.HelloReply: |
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return helloworld_pb2.HelloReply(message="Hello, %s!" % request.name) |
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async def run_server(port: int) -> Tuple[grpc.aio.Server, int]: |
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# Bind interceptor to server |
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server = grpc.aio.server(interceptors=(SignatureValidationInterceptor(),)) |
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helloworld_pb2_grpc.add_GreeterServicer_to_server(SimpleGreeter(), server) |
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# Loading credentials |
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server_credentials = grpc.ssl_server_credentials( |
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( |
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( |
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_credentials.SERVER_CERTIFICATE_KEY, |
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_credentials.SERVER_CERTIFICATE, |
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), |
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) |
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) |
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# Pass down credentials |
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port = server.add_secure_port( |
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_LISTEN_ADDRESS_TEMPLATE % port, server_credentials |
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) |
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await server.start() |
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return server, port |
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async def main() -> None: |
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parser = argparse.ArgumentParser() |
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parser.add_argument( |
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"--port", nargs="?", type=int, default=50051, help="the listening port" |
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) |
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args = parser.parse_args() |
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server, port = await run_server(args.port) |
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logging.info("Server is listening at port :%d", port) |
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await server.wait_for_termination() |
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if __name__ == "__main__": |
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logging.basicConfig(level=logging.INFO) |
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asyncio.run(main())
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