/*
* JBoss, Home of Professional Open Source.
* 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.attribute;
import io.undertow.server.
HttpServerExchange;
import io.undertow.util.
HeaderValues;
import io.undertow.util.
HttpString;
/**
* A response header
*
* @author Stuart Douglas
*/
public class
ResponseHeaderAttribute implements
ExchangeAttribute {
private final
HttpString responseHeader;
public
ResponseHeaderAttribute(final
HttpString responseHeader) {
this.
responseHeader =
responseHeader;
}
@
Override
public
String readAttribute(final
HttpServerExchange exchange) {
HeaderValues header =
exchange.
getResponseHeaders().
get(
responseHeader);
if (
header == null) {
return null;
} else if(
header.
size() == 1) {
return
header.
getFirst();
}
StringBuilder sb = new
StringBuilder();
sb.
append("[");
for (int
i = 0;
i <
header.
size(); ++
i) {
if (
i != 0) {
sb.
append(", ");
}
sb.
append(
header.
get(
i));
}
sb.
append("]");
return
sb.
toString();
}
@
Override
public void
writeAttribute(final
HttpServerExchange exchange, final
String newValue) throws
ReadOnlyAttributeException {
exchange.
getResponseHeaders().
put(
responseHeader,
newValue);
}
public static final class
Builder implements
ExchangeAttributeBuilder {
@
Override
public
String name() {
return "Response header";
}
@
Override
public
ExchangeAttribute build(final
String token) {
if (
token.
startsWith("%{o,") &&
token.
endsWith("}")) {
final
HttpString headerName =
HttpString.
tryFromString(
token.
substring(4,
token.
length() - 1));
return new
ResponseHeaderAttribute(
headerName);
}
return null;
}
@
Override
public int
priority() {
return 0;
}
}
}