io.micronaut.http.server.netty.ssl.HttpRequestCertificateHandler Maven / Gradle / Ivy

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/*
 * Copyright 2017-2020 original 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
 *
 * https://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.micronaut.http.server.netty.ssl;

import io.micronaut.core.annotation.Internal;
import io.micronaut.http.HttpAttributes;
import io.micronaut.http.HttpMessage;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.ssl.SslHandler;

import javax.net.ssl.SSLPeerUnverifiedException;
import java.security.cert.Certificate;
import java.util.Optional;

/**
 * Adds the certificate to the decoded request.
 *
 * @author James Kleeh
 * @author Björn Heinrichs
 * @since 1.3.0
 */
@ChannelHandler.Sharable
@Internal
public class HttpRequestCertificateHandler extends ChannelInboundHandlerAdapter {

    @Override
    public void channelRead(final ChannelHandlerContext ctx, final Object msg) throws Exception {
        if (msg instanceof HttpMessage) {
            HttpMessage request = (HttpMessage) msg;
            Optional certificate = getCertificate(ctx.pipeline().get(SslHandler.class));

            if (certificate.isPresent()) {
                request.setAttribute(HttpAttributes.X509_CERTIFICATE, certificate.get());
            } else {
                request.removeAttribute(HttpAttributes.X509_CERTIFICATE, Certificate.class);
            }
            super.channelRead(ctx, msg);
        }
    }

    private static Optional getCertificate(final SslHandler handler) {
        if (handler == null) {
            return Optional.empty();
        }
        try {
            return Optional.of(
                    handler.engine().getSession().getPeerCertificates()[0]
            );
        } catch (SSLPeerUnverifiedException ex) {
            return Optional.empty();
        }
    }
}