src/main/java/org/takes/rs/RsGzip.java
/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2024 Yegor Bugayenko
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package org.takes.rs;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.zip.GZIPOutputStream;
import lombok.EqualsAndHashCode;
import lombok.ToString;
import org.takes.Response;
/**
* Response compressed with GZIP, according to RFC 1952.
*
* <p>The class is immutable and thread-safe.
*
* @since 0.10
*/
@ToString(of = "origin")
@EqualsAndHashCode
public final class RsGzip implements Response {
/**
* Original response.
*/
private final Response origin;
/**
* Compressed and cached response.
*/
private final List<Response> zipped;
/**
* Ctor.
* @param res Original response
*/
public RsGzip(final Response res) {
this.zipped = new CopyOnWriteArrayList<>();
this.origin = res;
}
@Override
public Iterable<String> head() throws IOException {
return this.make().head();
}
@Override
public InputStream body() throws IOException {
return this.make().body();
}
/**
* Make a response.
* @return Response just made
* @throws IOException If fails
*/
private Response make() throws IOException {
if (this.zipped.isEmpty()) {
this.zipped.add(
new RsWithHeader(
new RsWithBody(
this.origin,
RsGzip.gzip(this.origin.body())
),
"Content-Encoding",
"gzip"
)
);
}
return this.zipped.get(0);
}
/**
* Gzip input stream.
* @param input Input stream
* @return New input stream
* @throws IOException If fails
*/
private static byte[] gzip(final InputStream input)
throws IOException {
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
final byte[] buf = new byte[4096];
final OutputStream gzip = new GZIPOutputStream(baos);
try {
while (true) {
final int len = input.read(buf);
if (len < 0) {
break;
}
gzip.write(buf, 0, len);
}
} finally {
gzip.close();
input.close();
}
return baos.toByteArray();
}
}