io.undertow.server.handlers.builder.RewriteHandlerBuilder Maven / Gradle / Ivy
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* 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.builder;
import io.undertow.attribute.ConstantExchangeAttribute;
import io.undertow.attribute.ExchangeAttribute;
import io.undertow.attribute.ExchangeAttributes;
import io.undertow.attribute.ReadOnlyAttributeException;
import io.undertow.server.HandlerWrapper;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.server.handlers.SetAttributeHandler;
import io.undertow.UndertowLogger;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
/**
* @author Stuart Douglas
*/
public class RewriteHandlerBuilder implements HandlerBuilder {
@Override
public String name() {
return "rewrite";
}
@Override
public Map> parameters() {
return Collections.>singletonMap("value", ExchangeAttribute.class);
}
@Override
public Set requiredParameters() {
return Collections.singleton("value");
}
@Override
public String defaultParameter() {
return "value";
}
@Override
public HandlerWrapper build(final Map config) {
final ExchangeAttribute configValue = (ExchangeAttribute) config.get("value");
ExchangeAttribute tmpValue = null;
if(configValue instanceof ConstantExchangeAttribute) {
tmpValue = new ConstantExchangeAttribute(normalize(configValue.readAttribute(null)));
} else {
tmpValue = new ExchangeAttribute() {
@Override
public String readAttribute(HttpServerExchange exchange) {
return normalize(configValue.readAttribute(exchange));
}
@Override
public void writeAttribute(HttpServerExchange exchange, String newValue) throws ReadOnlyAttributeException {
throw new ReadOnlyAttributeException("constant", newValue);
}
public String toString() {
return "NDA";
};
};
}
final ExchangeAttribute value = tmpValue;
return new HandlerWrapper() {
@Override
public HttpHandler wrap(HttpHandler handler) {
return new SetAttributeHandler(handler, ExchangeAttributes.relativePath(), value){
@Override
public void handleRequest(HttpServerExchange exchange) throws Exception {
UndertowLogger.PREDICATE_LOGGER.debugf("Request rewritten to [%s] for %s.", getValue().readAttribute(exchange), exchange);
super.handleRequest(exchange);
}
@Override
public String toString() {
return "rewrite( '" + getValue().toString() + "' )";
}
};
}
};
}
private String normalize(final String readAttribute) {
if (readAttribute.startsWith("/")) {
return readAttribute;
} else {
return "/" + readAttribute;
}
}
}
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