de.escalon.hypermedia.spring.ForwardedHeader Maven / Gradle / Ivy
/*
* Copyright 2014 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
*
* 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 de.escalon.hypermedia.spring;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* Copied over from original impl in spring-hateoas to support AffordanceBuilder.getBuilder.
*
* Value object to partially implement the {@literal Forwarded} header defined in RFC 7239.
*
* @author Oliver Gierke
* @see http://tools.ietf.org/html/rfc7239
*/
class ForwardedHeader {
public static String NAME = "Forwarded";
private static final ForwardedHeader NO_HEADER = new ForwardedHeader(Collections. emptyMap());
private final Map elements;
private ForwardedHeader(Map elements) {
this.elements = elements;
}
/**
* Creates a new {@link ForwardedHeader} from the given source.
*
* @param source can be {@literal null}.
* @return
*/
public static ForwardedHeader of(String source) {
if (!StringUtils.hasText(source)) {
return NO_HEADER;
}
Map elements = new HashMap();
for (String part : source.split(";")) {
String[] keyValue = part.split("=");
if (keyValue.length != 2) {
continue;
}
elements.put(keyValue[0].trim(), keyValue[1].trim());
}
Assert.notNull(elements, "Forwarded elements must not be null!");
Assert.isTrue(!elements.isEmpty(), "At least one forwarded element needs to be present!");
return new ForwardedHeader(elements);
}
/**
* Returns the value defined for the {@code proto} parameter of the header.
*
* @return
*/
public String getProto() {
return elements.get("proto");
}
/**
* Returns the value defined for the {@code host} parameter of the header.
*
* @return
*/
public String getHost() {
return elements.get("host");
}
}