/*
* 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);
}
@
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<
String,
Class<?>>
parameters() {
Map<
String,
Class<?>>
parameters = new
HashMap<>();
parameters.
put("value",
ExchangeAttribute.class);
parameters.
put("attribute",
ExchangeAttribute.class);
parameters.
put("pre-commit",
Boolean.class);
return
parameters;
}
@
Override
public
Set<
String>
requiredParameters() {
final
Set<
String>
req = new
HashSet<>();
req.
add("value");
req.
add("attribute");
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
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<
String,
Class<?>>
parameters() {
Map<
String,
Class<?>>
parameters = new
HashMap<>();
parameters.
put("attribute",
ExchangeAttribute.class);
parameters.
put("pre-commit",
Boolean.class);
return
parameters;
}
@
Override
public
Set<
String>
requiredParameters() {
final
Set<
String>
req = new
HashSet<>();
req.
add("attribute");
return
req;
}
@
Override
public
String defaultParameter() {
return "attribute";
}
@
Override
public
HandlerWrapper build(final
Map<
String,
Object>
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);
}
};
}
}
}