/*
* 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.server.handlers;
import io.undertow.
UndertowMessages;
import io.undertow.attribute.
ExchangeAttribute;
import io.undertow.attribute.
ExchangeAttributes;
import io.undertow.server.
HandlerWrapper;
import io.undertow.server.
HttpHandler;
import io.undertow.server.
HttpServerExchange;
import io.undertow.server.handlers.builder.
HandlerBuilder;
import io.undertow.util.
HttpString;
import java.util.
HashMap;
import java.util.
HashSet;
import java.util.
Map;
import java.util.
Set;
/**
* Set a fixed response header.
*
* @author Stuart Douglas
*/
public class
SetHeaderHandler implements
HttpHandler {
private final
HttpString header;
private final
ExchangeAttribute value;
private final
HttpHandler next;
public
SetHeaderHandler(final
String header, final
String value) {
if(
value == null) {
throw
UndertowMessages.
MESSAGES.
argumentCannotBeNull("value");
}
if(
header == null) {
throw
UndertowMessages.
MESSAGES.
argumentCannotBeNull("header");
}
this.
next =
ResponseCodeHandler.
HANDLE_404;
this.
value =
ExchangeAttributes.
constant(
value);
this.
header = new
HttpString(
header);
}
public
SetHeaderHandler(final
HttpHandler next, final
String header, final
ExchangeAttribute value) {
if(
value == null) {
throw
UndertowMessages.
MESSAGES.
argumentCannotBeNull("value");
}
if(
header == null) {
throw
UndertowMessages.
MESSAGES.
argumentCannotBeNull("header");
}
if(
next == null) {
throw
UndertowMessages.
MESSAGES.
argumentCannotBeNull("next");
}
this.
next =
next;
this.
value =
value;
this.
header = new
HttpString(
header);
}
public
SetHeaderHandler(final
HttpHandler next, final
String header, final
String value) {
if(
value == null) {
throw
UndertowMessages.
MESSAGES.
argumentCannotBeNull("value");
}
if(
header == null) {
throw
UndertowMessages.
MESSAGES.
argumentCannotBeNull("header");
}
if(
next == null) {
throw
UndertowMessages.
MESSAGES.
argumentCannotBeNull("next");
}
this.
next =
next;
this.
value =
ExchangeAttributes.
constant(
value);
this.
header = new
HttpString(
header);
}
@
Override
public void
handleRequest(final
HttpServerExchange exchange) throws
Exception {
exchange.
getResponseHeaders().
put(
header,
value.
readAttribute(
exchange));
next.
handleRequest(
exchange);
}
public
ExchangeAttribute getValue() {
return
value;
}
public
HttpString getHeader() {
return
header;
}
public static class
Builder implements
HandlerBuilder {
@
Override
public
String name() {
return "header";
}
@
Override
public
Map<
String,
Class<?>>
parameters() {
Map<
String,
Class<?>>
parameters = new
HashMap<>();
parameters.
put("header",
String.class);
parameters.
put("value",
ExchangeAttribute.class);
return
parameters;
}
@
Override
public
Set<
String>
requiredParameters() {
final
Set<
String>
req = new
HashSet<>();
req.
add("value");
req.
add("header");
return
req;
}
@
Override
public
String defaultParameter() {
return null;
}
@
Override
public
HandlerWrapper build(final
Map<
String,
Object>
config) {
final
ExchangeAttribute value = (
ExchangeAttribute)
config.
get("value");
final
String header = (
String)
config.
get("header");
return new
HandlerWrapper() {
@
Override
public
HttpHandler wrap(
HttpHandler handler) {
return new
SetHeaderHandler(
handler,
header,
value);
}
};
}
}
}