/* * This file is part of Alpine. * * 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. * * SPDX-License-Identifier: Apache-2.0 * Copyright (c) Steve Springett. All Rights Reserved. */ package alpine.filters; import javax.validation.constraints.NotNull; import javax.ws.rs.WebApplicationException; import javax.ws.rs.core.Context; import javax.ws.rs.core.HttpHeaders; import javax.ws.rs.ext.Provider; import javax.ws.rs.ext.ReaderInterceptor; import javax.ws.rs.ext.ReaderInterceptorContext; import javax.ws.rs.ext.WriterInterceptor; import javax.ws.rs.ext.WriterInterceptorContext; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.List; import java.util.zip.GZIPInputStream; import java.util.zip.GZIPOutputStream; /** * Provides a way to gzip the response if the client can accept a gzip response. * * @author Steve Springett * @since 1.0.0 */ @Provider public class GZipInterceptor implements ReaderInterceptor, WriterInterceptor { private final HttpHeaders httpHeaders; /** * Constructor. * @param httpHeaders the The HttpHeaders */ public GZipInterceptor(@Context @NotNull HttpHeaders httpHeaders) { this.httpHeaders = httpHeaders; } @Override public Object aroundReadFrom(ReaderInterceptorContext context) throws IOException, WebApplicationException { final List<String> header = context.getHeaders().get(HttpHeaders.CONTENT_ENCODING); if (header != null && header.contains("gzip")) { // DO NOT CLOSE STREAMS final InputStream contentInputSteam = context.getInputStream(); final GZIPInputStream gzipInputStream = new GZIPInputStream(contentInputSteam); context.setInputStream(gzipInputStream); } return context.proceed(); } @Override public void aroundWriteTo(WriterInterceptorContext context) throws IOException, WebApplicationException { final List<String> requestHeader = httpHeaders.getRequestHeader(HttpHeaders.ACCEPT_ENCODING); if (requestHeader != null && requestHeader.contains("gzip")) { // DO NOT CLOSE STREAMS final OutputStream contextOutputStream = context.getOutputStream(); final GZIPOutputStream gzipOutputStream = new GZIPOutputStream(contextOutputStream); context.setOutputStream(gzipOutputStream); context.getHeaders().add(HttpHeaders.CONTENT_ENCODING, "gzip"); } context.proceed(); } }