| /* |
| * ==================================================================== |
| * 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.LinkedHashSet; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.apache.hc.core5.http.Header; |
| import org.apache.hc.core5.http.message.BasicHeader; |
| import org.apache.hc.core5.http.nio.AsyncEntityProducer; |
| import org.apache.hc.core5.http.nio.DataStreamChannel; |
| import org.apache.hc.core5.util.Args; |
| import org.apache.hc.core5.util.TextUtils; |
| |
| /** |
| * {@link AsyncEntityProducer} decorator that calculates a digest hash from |
| * the data stream content and appends its value to the list of trailers. |
| * |
| * @since 5.0 |
| */ |
| public class DigestingEntityProducer implements AsyncEntityProducer { |
| |
| private final AsyncEntityProducer wrapped; |
| private final MessageDigest digester; |
| |
| private volatile byte[] digest; |
| |
| public DigestingEntityProducer( |
| final String algo, |
| final AsyncEntityProducer wrapped) { |
| this.wrapped = Args.notNull(wrapped, "Entity consumer"); |
| try { |
| this.digester = MessageDigest.getInstance(algo); |
| } catch (final NoSuchAlgorithmException ex) { |
| throw new IllegalArgumentException("Unsupported digest algorithm: " + algo); |
| } |
| } |
| |
| @Override |
| public boolean isRepeatable() { |
| return wrapped.isRepeatable(); |
| } |
| |
| @Override |
| public long getContentLength() { |
| return wrapped.getContentLength(); |
| } |
| |
| @Override |
| public String getContentType() { |
| return wrapped.getContentType(); |
| } |
| |
| @Override |
| public String getContentEncoding() { |
| return wrapped.getContentEncoding(); |
| } |
| |
| @Override |
| public boolean isChunked() { |
| return wrapped.isChunked(); |
| } |
| |
| @Override |
| public Set<String> getTrailerNames() { |
| final Set<String> allNames = new LinkedHashSet<>(); |
| final Set<String> names = wrapped.getTrailerNames(); |
| if (names != null) { |
| allNames.addAll(names); |
| } |
| allNames.add("digest-algo"); |
| allNames.add("digest"); |
| return allNames; |
| } |
| |
| @Override |
| public int available() { |
| return wrapped.available(); |
| } |
| |
| @Override |
| public void produce(final DataStreamChannel channel) throws IOException { |
| wrapped.produce(new DataStreamChannel() { |
| |
| @Override |
| public void requestOutput() { |
| channel.requestOutput(); |
| } |
| |
| @Override |
| public int write(final ByteBuffer src) throws IOException { |
| final ByteBuffer dup = src.duplicate(); |
| final int writtenBytes = channel.write(src); |
| if (writtenBytes > 0) { |
| dup.limit(dup.position() + writtenBytes); |
| digester.update(dup); |
| } |
| return writtenBytes; |
| } |
| |
| @Override |
| public void endStream(final List<? extends Header> trailers) throws IOException { |
| digest = digester.digest(); |
| final List<Header> allTrailers = new ArrayList<>(); |
| if (trailers != null) { |
| allTrailers.addAll(trailers); |
| } |
| allTrailers.add(new BasicHeader("digest-algo", digester.getAlgorithm())); |
| allTrailers.add(new BasicHeader("digest", TextUtils.toHexString(digest))); |
| channel.endStream(allTrailers); |
| } |
| |
| @Override |
| public void endStream() throws IOException { |
| endStream(null); |
| } |
| |
| }); |
| } |
| |
| @Override |
| public void failed(final Exception cause) { |
| wrapped.failed(cause); |
| } |
| |
| @Override |
| public void releaseResources() { |
| wrapped.releaseResources(); |
| } |
| |
| /** |
| * Returns digest hash. |
| * |
| * @return the digest hash value. |
| */ |
| public byte[] getDigest() { |
| return digest; |
| } |
| |
| } |