io.deephaven.grpc.AbstractMtlsClientCertificateInterceptor Maven / Gradle / Ivy

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Utility project to make x509 client cert available in grpc calls on the server

There is a newer version: 0.36.1

/*
 * Copyright 2022 Deephaven Data Labs
 *
 * 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.
 */
package io.deephaven.grpc;

import io.grpc.Context;
import io.grpc.Contexts;
import io.grpc.Metadata;
import io.grpc.ServerCall;
import io.grpc.ServerCallHandler;
import io.grpc.ServerInterceptor;

import java.security.cert.X509Certificate;
import java.util.List;
import java.util.Optional;

/**
 * Base class for server implementations to offer their own hook to read the current certificates
 */
public abstract class AbstractMtlsClientCertificateInterceptor implements ServerInterceptor {
    @Override
    public  ServerCall.Listener interceptCall(ServerCall call, Metadata headers,
            ServerCallHandler next) {
        return getTransportCertificates(call)
                .map(x509Certificates -> Contexts.interceptCall(
                        Context.current().withValue(MTlsCertificate.CLIENT_CERTIFICATES, x509Certificates),
                        call,
                        headers,
                        next))
                .orElseGet(() -> next.startCall(call, headers));
    }

    protected abstract  Optional> getTransportCertificates(
            ServerCall call);
}