com.aspectran.web.activity.request.RequestHeaderParser Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2023 The Aspectran Project
*
* 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 com.aspectran.web.activity.request;
import com.aspectran.core.adapter.RequestAdapter;
import com.aspectran.core.lang.NonNull;
import com.aspectran.web.support.http.HttpHeaders;
import com.aspectran.web.support.http.HttpMediaTypeNotAcceptableException;
import com.aspectran.web.support.http.InvalidMediaTypeException;
import com.aspectran.web.support.http.MediaType;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
/**
* Provides convenient methods to parse the request headers.
*
* @since 6.2.0
*/
public class RequestHeaderParser {
/**
* A singleton list with {@link MediaType#ALL} that is returned from
* {@link #resolveAcceptContentTypes} when no specific media types are requested.
*/
public static final List MEDIA_TYPE_ALL_LIST = Collections.singletonList(MediaType.ALL);
private RequestHeaderParser() {
}
@NonNull
public static List resolveAcceptContentTypes(RequestAdapter requestAdapter)
throws HttpMediaTypeNotAcceptableException {
Collection acceptHeaderValues = requestAdapter.getHeaderValues(HttpHeaders.ACCEPT);
if (acceptHeaderValues == null || acceptHeaderValues.isEmpty()) {
return MEDIA_TYPE_ALL_LIST;
}
List headerValues = new ArrayList<>(acceptHeaderValues);
try {
List mediaTypes = MediaType.parseMediaTypes(headerValues);
MediaType.sortBySpecificityAndQuality(mediaTypes);
if (mediaTypes != null && !mediaTypes.isEmpty()) {
return mediaTypes;
} else {
return MEDIA_TYPE_ALL_LIST;
}
} catch (InvalidMediaTypeException e) {
throw new HttpMediaTypeNotAcceptableException(
"Could not parse 'Accept' header " + headerValues + ": " + e.getMessage());
}
}
}