| /* |
| * ==================================================================== |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| package org.apache.hc.core5.http.nio.entity; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.hc.core5.concurrent.FutureCallback; |
| import org.apache.hc.core5.http.EntityDetails; |
| import org.apache.hc.core5.http.Header; |
| import org.apache.hc.core5.http.HttpException; |
| import org.apache.hc.core5.http.nio.AsyncEntityConsumer; |
| import org.apache.hc.core5.http.nio.CapacityChannel; |
| import org.apache.hc.core5.util.Args; |
| |
| /** |
| * {@link AsyncEntityConsumer} decorator that calculates a digest hash from |
| * the data stream content and keeps the list of trailers received with |
| * the data stream. |
| * |
| * @since 5.0 |
| */ |
| public class DigestingEntityConsumer<T> implements AsyncEntityConsumer<T> { |
| |
| private final AsyncEntityConsumer<T> wrapped; |
| private final List<Header> trailers; |
| private final MessageDigest digester; |
| |
| private volatile byte[] digest; |
| |
| public DigestingEntityConsumer( |
| final String algo, |
| final AsyncEntityConsumer<T> wrapped) throws NoSuchAlgorithmException { |
| this.wrapped = Args.notNull(wrapped, "Entity consumer"); |
| this.trailers = new ArrayList<>(); |
| this.digester = MessageDigest.getInstance(algo); |
| } |
| |
| @Override |
| public void streamStart( |
| final EntityDetails entityDetails, |
| final FutureCallback<T> resultCallback) throws IOException, HttpException { |
| wrapped.streamStart(entityDetails, resultCallback); |
| } |
| |
| @Override |
| public void updateCapacity(final CapacityChannel capacityChannel) throws IOException { |
| wrapped.updateCapacity(capacityChannel); |
| } |
| |
| @Override |
| public void consume(final ByteBuffer src) throws IOException { |
| src.mark(); |
| digester.update(src); |
| src.reset(); |
| wrapped.consume(src); |
| } |
| |
| @Override |
| public void streamEnd(final List<? extends Header> trailers) throws HttpException, IOException { |
| if (trailers != null) { |
| this.trailers.addAll(trailers); |
| } |
| digest = digester.digest(); |
| wrapped.streamEnd(trailers); |
| } |
| |
| @Override |
| public void failed(final Exception cause) { |
| wrapped.failed(cause); |
| } |
| |
| @Override |
| public T getContent() { |
| return wrapped.getContent(); |
| } |
| |
| @Override |
| public void releaseResources() { |
| wrapped.releaseResources(); |
| } |
| |
| /** |
| * List of trailers sent with the data stream. |
| * |
| * @return the list of trailers sent with the data stream |
| */ |
| public List<Header> getTrailers() { |
| return trailers != null ? new ArrayList<>(trailers) : null; |
| } |
| |
| /** |
| * Returns digest hash. |
| * |
| * @return the digest hash value. |
| */ |
| public byte[] getDigest() { |
| return digest; |
| } |
| |
| } |