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Servlet 3 filter for HTTP request and response logging

There is a newer version: 1.5.1

package org.zalando.logbook.servlet;

/*
 * #%L
 * Logbook: Servlet
 * %%
 * Copyright (C) 2015 Zalando SE
 * %%
 * 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.
 * #L%
 */

import org.zalando.logbook.Correlator;
import org.zalando.logbook.Logbook;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Optional;

import static org.zalando.logbook.servlet.Attributes.CORRELATOR;

final class SecurityStrategy implements Strategy {

    @Override
    public void doFilter(final Logbook logbook, final HttpServletRequest httpRequest,
            final HttpServletResponse httpResponse, final FilterChain chain) throws ServletException, IOException {

        final RemoteRequest request = new RemoteRequest(httpRequest);
        final String protocolVersion = request.getProtocolVersion();
        final LocalResponse response = new LocalResponse(httpResponse, protocolVersion);

        chain.doFilter(request, response);

        if (isUnauthorized(response)) {
            final Optional correlator;

            if (isFirstRequest(request)) {
                correlator = logbook.write(new UnauthorizedRawHttpRequest(request));
            } else {
                correlator = readCorrelator(request);
            }

            if (correlator.isPresent()) {
                correlator.get().write(response);
            }
        }
    }

    private boolean isUnauthorized(final HttpServletResponse response) {
        return response.getStatus() == 401;
    }

    private Optional readCorrelator(final RemoteRequest request) {
        return Optional.ofNullable(request.getAttribute(CORRELATOR)).map(Correlator.class::cast);
    }

}