io.undertow.server.handlers.resource.PreCompressedResourceSupplier Maven / Gradle / Ivy
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* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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
*
* 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.
*/
package io.undertow.server.handlers.resource;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.nio.file.Path;
import java.util.Date;
import java.util.List;
import java.util.Map;
import io.undertow.io.IoCallback;
import io.undertow.io.Sender;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.CopyOnWriteMap;
import io.undertow.util.ETag;
import io.undertow.util.Headers;
import io.undertow.util.MimeMappings;
import io.undertow.util.QValueParser;
/**
* A resource supplier that allows pre-compressed resources to be served if the client accepts the request.
*
* This is done by checking for the existence of a pre-compressed file, and if it exists and the
* client supports the encoding then the resource is returned for the pre compressed file
*
* @author Stuart Douglas
*/
public class PreCompressedResourceSupplier implements ResourceSupplier {
private final ResourceManager resourceManager;
private final Map encodingMap = new CopyOnWriteMap<>();
public PreCompressedResourceSupplier(ResourceManager resourceManager) {
this.resourceManager = resourceManager;
}
@Override
public Resource getResource(HttpServerExchange exchange, String path) throws IOException {
Resource originalResource = resourceManager.getResource(path);
if(exchange.getRequestHeaders().contains(Headers.RANGE)) {
//we don't use serve pre compressed resources for range requests
return originalResource;
}
Resource resource = getEncodedResource(exchange, path, originalResource);
if(resource == null) {
return originalResource;
}
return resource;
}
private Resource getEncodedResource(final HttpServerExchange exchange, String path, Resource originalResource) throws IOException {
final List res = exchange.getRequestHeaders().get(Headers.ACCEPT_ENCODING);
if (res == null || res.isEmpty()) {
return null;
}
final List> found = QValueParser.parse(res);
for (List result : found) {
for (final QValueParser.QValueResult value : result) {
String extension = encodingMap.get(value.getValue());
if(extension != null) {
String newPath = path + extension;
Resource resource = resourceManager.getResource(newPath);
if(resource != null && !resource.isDirectory()) {
return new Resource() {
@Override
public String getPath() {
return resource.getPath();
}
@Override
public Date getLastModified() {
return resource.getLastModified();
}
@Override
public String getLastModifiedString() {
return resource.getLastModifiedString();
}
@Override
public ETag getETag() {
return resource.getETag();
}
@Override
public String getName() {
return resource.getName();
}
@Override
public boolean isDirectory() {
return false;
}
@Override
public List list() {
return resource.list();
}
@Override
public String getContentType(MimeMappings mimeMappings) {
return originalResource.getContentType(mimeMappings);
}
@Override
public void serve(Sender sender, HttpServerExchange exchange, IoCallback completionCallback) {
exchange.getResponseHeaders().put(Headers.CONTENT_ENCODING, value.getValue());
resource.serve(sender, exchange, completionCallback);
}
@Override
public Long getContentLength() {
return resource.getContentLength();
}
@Override
public String getCacheKey() {
return resource.getCacheKey();
}
@Override
public File getFile() {
return resource.getFile();
}
@Override
public Path getFilePath() {
return resource.getFilePath();
}
@Override
public File getResourceManagerRoot() {
return resource.getResourceManagerRoot();
}
@Override
public Path getResourceManagerRootPath() {
return resource.getResourceManagerRootPath();
}
@Override
public URL getUrl() {
return resource.getUrl();
}
};
}
}
}
}
return null;
}
public PreCompressedResourceSupplier addEncoding(String encoding, String extension) {
encodingMap.put(encoding, extension);
return this;
}
public PreCompressedResourceSupplier removeEncoding(String encoding) {
encodingMap.remove(encoding);
return this;
}
}