Vert.x gRPC JWT Authentication Shim

This project contains PR #49 classes to provide a shim JWT support in Vert.x gRPC.

It is not recommended to use this project without understanding what classes will be patched.

The poc-grpc-vertx-server (shim branch) project contains a PoC which demonstrates how this shim can be used.

Usage - Server

The #callHandler method can be used to setup handlers for methods which require authentication or which are public and don't require authentication.

    JWTAuthOptions jwtConfig = new JWTAuthOptions()
        .setKeyStore(new KeyStoreOptions().setPath(keystorePath.toString())
        .setPassword(keystorePassword)
        .setType("jceks"));

    JWTAuth jwtAuth = JWTAuth.create(vertx, jwtConfig);

    JWTGrpcServer jwtServer = JWTGrpcServer.create(vertx, jwtAuth);

    jwtServer.callHandler(GreeterGrpc.getSayHelloMethod(), true, request -> {
        User user = request.user();
        request.handler(hello -> {
            log.info("Server got hello request with name {} from {}", hello.getName(), user.subject());
            GrpcServerResponse<HelloRequest, HelloReply> response = request.response();
            HelloReply reply = HelloReply.newBuilder()
                .setMessage("Reply with " + hello.getName())
                .build();
            response.end(reply);
        });
    });

    server = vertx.createHttpServer(new HttpServerOptions().setPort(0)
			.setHost("localhost")).requestHandler(jwtServer);

Usage - Client

The client will send credentials to the server if those have been provided by setting a JWT via #withCredentials.

    String token = …
    JWTGrpcClient client = JWTGrpcClient.create(vertx).withCredentials(new TokenCredentials(token));
	this.socket = SocketAddress.inetSocketAddress(port, host);

	Future<HelloReply> reply = client.request(socket, GreeterGrpc.getSayHelloMethod()).compose(request -> {
		    request.end(HelloRequest
			    .newBuilder()
				.setName(name)
				.build());

		return request.response()
			.compose(GrpcClientResponse::last);
        });