001/* 002 * Copyright 2002-2018 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.web.reactive.accept; 018 019import java.util.List; 020 021import org.springframework.http.InvalidMediaTypeException; 022import org.springframework.http.MediaType; 023import org.springframework.util.CollectionUtils; 024import org.springframework.web.server.NotAcceptableStatusException; 025import org.springframework.web.server.ServerWebExchange; 026 027/** 028 * Resolver that looks at the 'Accept' header of the request. 029 * 030 * @author Rossen Stoyanchev 031 * @since 5.0 032 */ 033public class HeaderContentTypeResolver implements RequestedContentTypeResolver { 034 035 @Override 036 public List<MediaType> resolveMediaTypes(ServerWebExchange exchange) throws NotAcceptableStatusException { 037 try { 038 List<MediaType> mediaTypes = exchange.getRequest().getHeaders().getAccept(); 039 MediaType.sortBySpecificityAndQuality(mediaTypes); 040 return (!CollectionUtils.isEmpty(mediaTypes) ? mediaTypes : MEDIA_TYPE_ALL_LIST); 041 } 042 catch (InvalidMediaTypeException ex) { 043 String value = exchange.getRequest().getHeaders().getFirst("Accept"); 044 throw new NotAcceptableStatusException( 045 "Could not parse 'Accept' header [" + value + "]: " + ex.getMessage()); 046 } 047 } 048 049}