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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 com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.UnmodifiableIterator;
import com.google.common.io.ByteArrayDataOutput;
import com.google.common.io.ByteStreams;
import org.zalando.logbook.HttpRequest;
import org.zalando.logbook.Origin;
import org.zalando.logbook.RawHttpRequest;

import javax.annotation.Nullable;
import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.Optional;

import static com.google.common.base.MoreObjects.firstNonNull;
import static com.google.common.collect.Iterators.addAll;
import static com.google.common.collect.Iterators.forEnumeration;
import static com.google.common.collect.Multimaps.unmodifiableListMultimap;
import static java.nio.charset.StandardCharsets.ISO_8859_1;

final class RemoteRequest extends HttpServletRequestWrapper implements RawHttpRequest, HttpRequest {

    private final ByteArrayDataOutput output = ByteStreams.newDataOutput();
    
    /**
     * Null until we successfully intercepted it.
     */
    @Nullable
    private byte[] body;

    RemoteRequest(final HttpServletRequest request) {
        super(request);
    }

    @Override
    public String getProtocolVersion() {
        return getProtocol();
    }

    @Override
    public Origin getOrigin() {
        return Origin.REMOTE;
    }

    @Override
    public String getRemote() {
        return getRemoteAddr();
    }

    @Override
    public String getHost() {
        return getServerName();
    }

    @Override
    public int getPort() {
        return getServerPort();
    }

    @Override
    public String getPath() {
        return getRequestURI();
    }

    @Override
    public String getQuery() {
        return firstNonNull(getQueryString(), "");
    }

    @Override
    public ListMultimap getHeaders() {
        final ListMultimap headers = Headers.create();
        final UnmodifiableIterator names = forEnumeration(getHeaderNames());

        while (names.hasNext()) {
            final String name = names.next();
            addAll(headers.get(name), forEnumeration(getHeaders(name)));
        }

        return unmodifiableListMultimap(headers);
    }

    @Override
    public String getContentType() {
        return firstNonNull(super.getContentType(), "");
    }

    @Override
    public Charset getCharset() {
        return Optional.ofNullable(getCharacterEncoding()).map(Charset::forName).orElse(ISO_8859_1);
    }

    @Override
    public HttpRequest withBody() throws IOException {
        final ServletInputStream stream = getInputStream();
        final byte[] bytes = ByteStreams.toByteArray(stream);
        output.write(bytes);
        this.body = bytes;

        return this;
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        return body == null ?
                super.getInputStream() :
                new ServletInputStreamAdapter(new ByteArrayInputStream(body));
    }

    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(getInputStream(), getCharset()));
    }

    @Override
    public byte[] getBody() {
        return body;
    }

    @VisibleForTesting
    ByteArrayDataOutput getOutput() {
        return output;
    }

}