io.undertow.attribute.RequestHeaderAttribute Maven / Gradle / Ivy
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* 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 request header
*
* @author Stuart Douglas
*/
public class RequestHeaderAttribute implements ExchangeAttribute {
private final HttpString requestHeader;
public RequestHeaderAttribute(final HttpString requestHeader) {
this.requestHeader = requestHeader;
}
@Override
public String readAttribute(final HttpServerExchange exchange) {
HeaderValues header = exchange.getRequestHeaders().get(requestHeader);
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.getRequestHeaders().put(requestHeader, newValue);
}
@Override
public String toString() {
return "%{i," + requestHeader + "}";
}
public static final class Builder implements ExchangeAttributeBuilder {
@Override
public String name() {
return "Request header";
}
@Override
public ExchangeAttribute build(final String token) {
if (token.startsWith("%{i,") && token.endsWith("}")) {
final HttpString headerName = HttpString.tryFromString(token.substring(4, token.length() - 1));
return new RequestHeaderAttribute(headerName);
}
return null;
}
@Override
public int priority() {
return 0;
}
}
}