org.springframework.boot.web.embedded.netty.CompressionCustomizer Maven / Gradle / Ivy
/*
* Copyright 2012-2019 the original author or authors.
*
* 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
*
* 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 org.springframework.boot.web.embedded.netty;
import java.util.Arrays;
import java.util.List;
import java.util.function.BiPredicate;
import java.util.stream.Collectors;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpHeaders;
import reactor.netty.http.server.HttpServer;
import reactor.netty.http.server.HttpServerRequest;
import reactor.netty.http.server.HttpServerResponse;
import org.springframework.boot.web.server.Compression;
import org.springframework.util.InvalidMimeTypeException;
import org.springframework.util.MimeType;
import org.springframework.util.MimeTypeUtils;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
/**
* Configure the HTTP compression on a Reactor Netty request/response handler.
*
* @author Stephane Maldini
* @author Phillip Webb
* @author Brian Clozel
*/
final class CompressionCustomizer implements NettyServerCustomizer {
private static final CompressionPredicate ALWAYS_COMPRESS = (request, response) -> true;
private final Compression compression;
CompressionCustomizer(Compression compression) {
this.compression = compression;
}
@Override
public HttpServer apply(HttpServer server) {
if (!this.compression.getMinResponseSize().isNegative()) {
server = server.compress((int) this.compression.getMinResponseSize().toBytes());
}
CompressionPredicate mimeTypes = getMimeTypesPredicate(this.compression.getMimeTypes());
CompressionPredicate excludedUserAgents = getExcludedUserAgentsPredicate(
this.compression.getExcludedUserAgents());
server = server.compress(mimeTypes.and(excludedUserAgents));
return server;
}
private CompressionPredicate getMimeTypesPredicate(String[] mimeTypeValues) {
if (ObjectUtils.isEmpty(mimeTypeValues)) {
return ALWAYS_COMPRESS;
}
List mimeTypes = Arrays.stream(mimeTypeValues).map(MimeTypeUtils::parseMimeType)
.collect(Collectors.toList());
return (request, response) -> {
String contentType = response.responseHeaders().get(HttpHeaderNames.CONTENT_TYPE);
if (StringUtils.isEmpty(contentType)) {
return false;
}
try {
MimeType contentMimeType = MimeTypeUtils.parseMimeType(contentType);
return mimeTypes.stream().anyMatch((candidate) -> candidate.isCompatibleWith(contentMimeType));
}
catch (InvalidMimeTypeException ex) {
return false;
}
};
}
private CompressionPredicate getExcludedUserAgentsPredicate(String[] excludedUserAgents) {
if (ObjectUtils.isEmpty(excludedUserAgents)) {
return ALWAYS_COMPRESS;
}
return (request, response) -> {
HttpHeaders headers = request.requestHeaders();
return Arrays.stream(excludedUserAgents)
.noneMatch((candidate) -> headers.contains(HttpHeaderNames.USER_AGENT, candidate, true));
};
}
private interface CompressionPredicate extends BiPredicate {
}
}