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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.server.handlers;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import io.undertow.attribute.ExchangeAttribute;
import io.undertow.attribute.ExchangeAttributeParser;
import io.undertow.attribute.ExchangeAttributes;
import io.undertow.attribute.NullAttribute;
import io.undertow.attribute.ReadOnlyAttributeException;
import io.undertow.server.HandlerWrapper;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.server.ResponseCommitListener;
import io.undertow.server.handlers.builder.HandlerBuilder;
/**
* Handler that can set an arbitrary attribute on the exchange. Both the attribute and the
* value to set are expressed as exchange attributes.
*
*
* @author Stuart Douglas
*/
public class SetAttributeHandler implements HttpHandler {
private final HttpHandler next;
private final ExchangeAttribute attribute;
private final ExchangeAttribute value;
private final boolean preCommit;
public SetAttributeHandler(HttpHandler next, ExchangeAttribute attribute, ExchangeAttribute value) {
this(next, attribute, value, false);
}
public SetAttributeHandler(HttpHandler next, final String attribute, final String value) {
this.next = next;
ExchangeAttributeParser parser = ExchangeAttributes.parser(getClass().getClassLoader());
this.attribute = parser.parseSingleToken(attribute);
this.value = parser.parse(value);
this.preCommit = false;
}
public SetAttributeHandler(HttpHandler next, final String attribute, final String value, final ClassLoader classLoader) {
this.next = next;
ExchangeAttributeParser parser = ExchangeAttributes.parser(classLoader);
this.attribute = parser.parseSingleToken(attribute);
this.value = parser.parse(value);
this.preCommit = false;
}
public SetAttributeHandler(HttpHandler next, ExchangeAttribute attribute, ExchangeAttribute value, boolean preCommit) {
this.next = next;
this.attribute = attribute;
this.value = value;
this.preCommit = preCommit;
}
public SetAttributeHandler(HttpHandler next, final String attribute, final String value, boolean preCommit) {
this.next = next;
this.preCommit = preCommit;
ExchangeAttributeParser parser = ExchangeAttributes.parser(getClass().getClassLoader());
this.attribute = parser.parseSingleToken(attribute);
this.value = parser.parse(value);
}
public SetAttributeHandler(HttpHandler next, final String attribute, final String value, final ClassLoader classLoader, boolean preCommit) {
this.next = next;
this.preCommit = preCommit;
ExchangeAttributeParser parser = ExchangeAttributes.parser(classLoader);
this.attribute = parser.parseSingleToken(attribute);
this.value = parser.parse(value);
}
public ExchangeAttribute getValue() {
return value;
}
@Override
public String toString() {
return "set( attribute='" + attribute.toString() + "', value='" + value.toString() + "' )";
}
@Override
public void handleRequest(HttpServerExchange exchange) throws Exception {
if(preCommit) {
exchange.addResponseCommitListener(new ResponseCommitListener() {
@Override
public void beforeCommit(HttpServerExchange exchange) {
try {
attribute.writeAttribute(exchange, value.readAttribute(exchange));
} catch (ReadOnlyAttributeException e) {
throw new RuntimeException(e);
}
}
});
} else {
attribute.writeAttribute(exchange, value.readAttribute(exchange));
}
next.handleRequest(exchange);
}
public static class Builder implements HandlerBuilder {
@Override
public String name() {
return "set";
}
@Override
public Map> parameters() {
Map> parameters = new HashMap<>();
parameters.put("value", ExchangeAttribute.class);
parameters.put("attribute", ExchangeAttribute.class);
parameters.put("pre-commit", Boolean.class);
return parameters;
}
@Override
public Set requiredParameters() {
final Set req = new HashSet<>();
req.add("value");
req.add("attribute");
return req;
}
@Override
public String defaultParameter() {
return null;
}
@Override
public HandlerWrapper build(final Map config) {
final ExchangeAttribute value = (ExchangeAttribute) config.get("value");
final ExchangeAttribute attribute = (ExchangeAttribute) config.get("attribute");
final Boolean preCommit = (Boolean) config.get("pre-commit");
return new HandlerWrapper() {
@Override
public HttpHandler wrap(HttpHandler handler) {
return new SetAttributeHandler(handler, attribute, value, preCommit == null ? false : preCommit);
}
};
}
}
public static class ClearBuilder implements HandlerBuilder {
@Override
public String name() {
return "clear";
}
@Override
public Map> parameters() {
Map> parameters = new HashMap<>();
parameters.put("attribute", ExchangeAttribute.class);
parameters.put("pre-commit", Boolean.class);
return parameters;
}
@Override
public Set requiredParameters() {
final Set req = new HashSet<>();
req.add("attribute");
return req;
}
@Override
public String defaultParameter() {
return "attribute";
}
@Override
public HandlerWrapper build(final Map config) {
final ExchangeAttribute attribute = (ExchangeAttribute) config.get("attribute");
final Boolean preCommit = (Boolean) config.get("pre-commit");
return new HandlerWrapper() {
@Override
public HttpHandler wrap(HttpHandler handler) {
return new SetAttributeHandler(handler, attribute, NullAttribute.INSTANCE, preCommit == null ? false : preCommit);
}
};
}
}
}
