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/*
* Copyright 2012 The Netty Project
*
* The Netty Project 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:
*
* https://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.
*/
package io.netty.handler.codec.http;
import java.util.HashMap;
import java.util.Map;
import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.embedded.EmbeddedChannel;
import io.netty.handler.codec.MessageToByteEncoder;
import io.netty.handler.codec.compression.Brotli;
import io.netty.handler.codec.compression.BrotliEncoder;
import io.netty.handler.codec.compression.BrotliOptions;
import io.netty.handler.codec.compression.CompressionOptions;
import io.netty.handler.codec.compression.DeflateOptions;
import io.netty.handler.codec.compression.GzipOptions;
import io.netty.handler.codec.compression.StandardCompressionOptions;
import io.netty.handler.codec.compression.ZlibCodecFactory;
import io.netty.handler.codec.compression.ZlibEncoder;
import io.netty.handler.codec.compression.ZlibWrapper;
import io.netty.handler.codec.compression.Zstd;
import io.netty.handler.codec.compression.ZstdEncoder;
import io.netty.handler.codec.compression.ZstdOptions;
import io.netty.util.internal.ObjectUtil;
/**
* Compresses an {@link HttpMessage} and an {@link HttpContent} in {@code gzip} or
* {@code deflate} encoding while respecting the {@code "Accept-Encoding"} header.
* If there is no matching encoding, no compression is done. For more
* information on how this handler modifies the message, please refer to
* {@link HttpContentEncoder}.
*/
public class HttpContentCompressor extends HttpContentEncoder {
private final boolean supportsCompressionOptions;
private final BrotliOptions brotliOptions;
private final GzipOptions gzipOptions;
private final DeflateOptions deflateOptions;
private final ZstdOptions zstdOptions;
private final int compressionLevel;
private final int windowBits;
private final int memLevel;
private final int contentSizeThreshold;
private ChannelHandlerContext ctx;
private final Map factories;
/**
* Creates a new handler with the default compression level (6),
* default window size (15) and default memory level (8).
*/
public HttpContentCompressor() {
this(6);
}
/**
* Creates a new handler with the specified compression level, default
* window size (15) and default memory level (8).
*
* @param compressionLevel
* {@code 1} yields the fastest compression and {@code 9} yields the
* best compression. {@code 0} means no compression. The default
* compression level is {@code 6}.
*/
@Deprecated
public HttpContentCompressor(int compressionLevel) {
this(compressionLevel, 15, 8, 0);
}
/**
* Creates a new handler with the specified compression level, window size,
* and memory level..
*
* @param compressionLevel
* {@code 1} yields the fastest compression and {@code 9} yields the
* best compression. {@code 0} means no compression. The default
* compression level is {@code 6}.
* @param windowBits
* The base two logarithm of the size of the history buffer. The
* value should be in the range {@code 9} to {@code 15} inclusive.
* Larger values result in better compression at the expense of
* memory usage. The default value is {@code 15}.
* @param memLevel
* How much memory should be allocated for the internal compression
* state. {@code 1} uses minimum memory and {@code 9} uses maximum
* memory. Larger values result in better and faster compression
* at the expense of memory usage. The default value is {@code 8}
*/
@Deprecated
public HttpContentCompressor(int compressionLevel, int windowBits, int memLevel) {
this(compressionLevel, windowBits, memLevel, 0);
}
/**
* Creates a new handler with the specified compression level, window size,
* and memory level..
*
* @param compressionLevel
* {@code 1} yields the fastest compression and {@code 9} yields the
* best compression. {@code 0} means no compression. The default
* compression level is {@code 6}.
* @param windowBits
* The base two logarithm of the size of the history buffer. The
* value should be in the range {@code 9} to {@code 15} inclusive.
* Larger values result in better compression at the expense of
* memory usage. The default value is {@code 15}.
* @param memLevel
* How much memory should be allocated for the internal compression
* state. {@code 1} uses minimum memory and {@code 9} uses maximum
* memory. Larger values result in better and faster compression
* at the expense of memory usage. The default value is {@code 8}
* @param contentSizeThreshold
* The response body is compressed when the size of the response
* body exceeds the threshold. The value should be a non negative
* number. {@code 0} will enable compression for all responses.
*/
@Deprecated
public HttpContentCompressor(int compressionLevel, int windowBits, int memLevel, int contentSizeThreshold) {
this.compressionLevel = ObjectUtil.checkInRange(compressionLevel, 0, 9, "compressionLevel");
this.windowBits = ObjectUtil.checkInRange(windowBits, 9, 15, "windowBits");
this.memLevel = ObjectUtil.checkInRange(memLevel, 1, 9, "memLevel");
this.contentSizeThreshold = ObjectUtil.checkPositiveOrZero(contentSizeThreshold, "contentSizeThreshold");
this.brotliOptions = null;
this.gzipOptions = null;
this.deflateOptions = null;
this.zstdOptions = null;
this.factories = null;
this.supportsCompressionOptions = false;
}
/**
* Create a new {@link HttpContentCompressor} Instance with specified
* {@link CompressionOptions}s and contentSizeThreshold set to {@code 0}
*
* @param compressionOptions {@link CompressionOptions} or {@code null} if the default
* should be used.
*/
public HttpContentCompressor(CompressionOptions... compressionOptions) {
this(0, compressionOptions);
}
/**
* Create a new {@link HttpContentCompressor} instance with specified
* {@link CompressionOptions}s
*
* @param contentSizeThreshold
* The response body is compressed when the size of the response
* body exceeds the threshold. The value should be a non negative
* number. {@code 0} will enable compression for all responses.
* @param compressionOptions {@link CompressionOptions} or {@code null}
* if the default should be used.
*/
public HttpContentCompressor(int contentSizeThreshold, CompressionOptions... compressionOptions) {
this.contentSizeThreshold = ObjectUtil.checkPositiveOrZero(contentSizeThreshold, "contentSizeThreshold");
BrotliOptions brotliOptions = null;
GzipOptions gzipOptions = null;
DeflateOptions deflateOptions = null;
ZstdOptions zstdOptions = null;
if (compressionOptions == null || compressionOptions.length == 0) {
brotliOptions = Brotli.isAvailable() ? StandardCompressionOptions.brotli() : null;
gzipOptions = StandardCompressionOptions.gzip();
deflateOptions = StandardCompressionOptions.deflate();
zstdOptions = Zstd.isAvailable() ? StandardCompressionOptions.zstd() : null;
} else {
ObjectUtil.deepCheckNotNull("compressionOptions", compressionOptions);
for (CompressionOptions compressionOption : compressionOptions) {
// BrotliOptions' class initialization depends on Brotli classes being on the classpath.
// The Brotli.isAvailable check ensures that BrotliOptions will only get instantiated if Brotli is
// on the classpath.
// This results in the static analysis of native-image identifying the instanceof BrotliOptions check
// and thus BrotliOptions itself as unreachable, enabling native-image to link all classes
// at build time and not complain about the missing Brotli classes.
if (Brotli.isAvailable() && compressionOption instanceof BrotliOptions) {
brotliOptions = (BrotliOptions) compressionOption;
} else if (compressionOption instanceof GzipOptions) {
gzipOptions = (GzipOptions) compressionOption;
} else if (compressionOption instanceof DeflateOptions) {
deflateOptions = (DeflateOptions) compressionOption;
} else if (compressionOption instanceof ZstdOptions) {
zstdOptions = (ZstdOptions) compressionOption;
} else {
throw new IllegalArgumentException("Unsupported " + CompressionOptions.class.getSimpleName() +
": " + compressionOption);
}
}
}
this.gzipOptions = gzipOptions;
this.deflateOptions = deflateOptions;
this.brotliOptions = brotliOptions;
this.zstdOptions = zstdOptions;
this.factories = new HashMap();
if (this.gzipOptions != null) {
this.factories.put("gzip", new GzipEncoderFactory());
}
if (this.deflateOptions != null) {
this.factories.put("deflate", new DeflateEncoderFactory());
}
if (Brotli.isAvailable() && this.brotliOptions != null) {
this.factories.put("br", new BrEncoderFactory());
}
if (this.zstdOptions != null) {
this.factories.put("zstd", new ZstdEncoderFactory());
}
this.compressionLevel = -1;
this.windowBits = -1;
this.memLevel = -1;
supportsCompressionOptions = true;
}
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
this.ctx = ctx;
}
@Override
protected Result beginEncode(HttpResponse httpResponse, String acceptEncoding) throws Exception {
if (this.contentSizeThreshold > 0) {
if (httpResponse instanceof HttpContent &&
((HttpContent) httpResponse).content().readableBytes() < contentSizeThreshold) {
return null;
}
}
String contentEncoding = httpResponse.headers().get(HttpHeaderNames.CONTENT_ENCODING);
if (contentEncoding != null) {
// Content-Encoding was set, either as something specific or as the IDENTITY encoding
// Therefore, we should NOT encode here
return null;
}
if (supportsCompressionOptions) {
String targetContentEncoding = determineEncoding(acceptEncoding);
if (targetContentEncoding == null) {
return null;
}
CompressionEncoderFactory encoderFactory = factories.get(targetContentEncoding);
if (encoderFactory == null) {
throw new Error();
}
return new Result(targetContentEncoding,
new EmbeddedChannel(ctx.channel().id(), ctx.channel().metadata().hasDisconnect(),
ctx.channel().config(), encoderFactory.createEncoder()));
} else {
ZlibWrapper wrapper = determineWrapper(acceptEncoding);
if (wrapper == null) {
return null;
}
String targetContentEncoding;
switch (wrapper) {
case GZIP:
targetContentEncoding = "gzip";
break;
case ZLIB:
targetContentEncoding = "deflate";
break;
default:
throw new Error();
}
return new Result(
targetContentEncoding,
new EmbeddedChannel(ctx.channel().id(), ctx.channel().metadata().hasDisconnect(),
ctx.channel().config(), ZlibCodecFactory.newZlibEncoder(
wrapper, compressionLevel, windowBits, memLevel)));
}
}
@SuppressWarnings("FloatingPointEquality")
protected String determineEncoding(String acceptEncoding) {
float starQ = -1.0f;
float brQ = -1.0f;
float zstdQ = -1.0f;
float gzipQ = -1.0f;
float deflateQ = -1.0f;
for (String encoding : acceptEncoding.split(",")) {
float q = 1.0f;
int equalsPos = encoding.indexOf('=');
if (equalsPos != -1) {
try {
q = Float.parseFloat(encoding.substring(equalsPos + 1));
} catch (NumberFormatException e) {
// Ignore encoding
q = 0.0f;
}
}
if (encoding.contains("*")) {
starQ = q;
} else if (encoding.contains("br") && q > brQ) {
brQ = q;
} else if (encoding.contains("zstd") && q > zstdQ) {
zstdQ = q;
} else if (encoding.contains("gzip") && q > gzipQ) {
gzipQ = q;
} else if (encoding.contains("deflate") && q > deflateQ) {
deflateQ = q;
}
}
if (brQ > 0.0f || zstdQ > 0.0f || gzipQ > 0.0f || deflateQ > 0.0f) {
if (brQ != -1.0f && brQ >= zstdQ && this.brotliOptions != null) {
return "br";
} else if (zstdQ != -1.0f && zstdQ >= gzipQ && this.zstdOptions != null) {
return "zstd";
} else if (gzipQ != -1.0f && gzipQ >= deflateQ && this.gzipOptions != null) {
return "gzip";
} else if (deflateQ != -1.0f && this.deflateOptions != null) {
return "deflate";
}
}
if (starQ > 0.0f) {
if (brQ == -1.0f && this.brotliOptions != null) {
return "br";
}
if (zstdQ == -1.0f && this.zstdOptions != null) {
return "zstd";
}
if (gzipQ == -1.0f && this.gzipOptions != null) {
return "gzip";
}
if (deflateQ == -1.0f && this.deflateOptions != null) {
return "deflate";
}
}
return null;
}
@Deprecated
@SuppressWarnings("FloatingPointEquality")
protected ZlibWrapper determineWrapper(String acceptEncoding) {
float starQ = -1.0f;
float gzipQ = -1.0f;
float deflateQ = -1.0f;
for (String encoding : acceptEncoding.split(",")) {
float q = 1.0f;
int equalsPos = encoding.indexOf('=');
if (equalsPos != -1) {
try {
q = Float.parseFloat(encoding.substring(equalsPos + 1));
} catch (NumberFormatException e) {
// Ignore encoding
q = 0.0f;
}
}
if (encoding.contains("*")) {
starQ = q;
} else if (encoding.contains("gzip") && q > gzipQ) {
gzipQ = q;
} else if (encoding.contains("deflate") && q > deflateQ) {
deflateQ = q;
}
}
if (gzipQ > 0.0f || deflateQ > 0.0f) {
if (gzipQ >= deflateQ) {
return ZlibWrapper.GZIP;
} else {
return ZlibWrapper.ZLIB;
}
}
if (starQ > 0.0f) {
if (gzipQ == -1.0f) {
return ZlibWrapper.GZIP;
}
if (deflateQ == -1.0f) {
return ZlibWrapper.ZLIB;
}
}
return null;
}
/**
* Compression Encoder Factory that creates {@link ZlibEncoder}s
* used to compress http content for gzip content encoding
*/
private final class GzipEncoderFactory implements CompressionEncoderFactory {
@Override
public MessageToByteEncoder createEncoder() {
return ZlibCodecFactory.newZlibEncoder(
ZlibWrapper.GZIP, gzipOptions.compressionLevel(),
gzipOptions.windowBits(), gzipOptions.memLevel());
}
}
/**
* Compression Encoder Factory that creates {@link ZlibEncoder}s
* used to compress http content for deflate content encoding
*/
private final class DeflateEncoderFactory implements CompressionEncoderFactory {
@Override
public MessageToByteEncoder createEncoder() {
return ZlibCodecFactory.newZlibEncoder(
ZlibWrapper.ZLIB, deflateOptions.compressionLevel(),
deflateOptions.windowBits(), deflateOptions.memLevel());
}
}
/**
* Compression Encoder Factory that creates {@link BrotliEncoder}s
* used to compress http content for br content encoding
*/
private final class BrEncoderFactory implements CompressionEncoderFactory {
@Override
public MessageToByteEncoder createEncoder() {
return new BrotliEncoder(brotliOptions.parameters());
}
}
/**
* Compression Encoder Factory for create {@link ZstdEncoder}
* used to compress http content for zstd content encoding
*/
private final class ZstdEncoderFactory implements CompressionEncoderFactory {
@Override
public MessageToByteEncoder createEncoder() {
return new ZstdEncoder(zstdOptions.compressionLevel(),
zstdOptions.blockSize(), zstdOptions.maxEncodeSize());
}
}
}
