io.undertow.attribute.QuotingExchangeAttribute 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.attribute;
import io.undertow.server.HttpServerExchange;
/**
* Exchange attribute that wraps string attributes in quotes.
*
* This is mostly used
*
* @author Stuart Douglas
*/
public class QuotingExchangeAttribute implements ExchangeAttribute {
private final ExchangeAttribute exchangeAttribute;
public static final ExchangeAttributeWrapper WRAPPER = new Wrapper();
public QuotingExchangeAttribute(ExchangeAttribute exchangeAttribute) {
this.exchangeAttribute = exchangeAttribute;
}
@Override
public String readAttribute(HttpServerExchange exchange) {
String svalue = exchangeAttribute.readAttribute(exchange);
// Does the value contain a " ? If so must encode it
if (svalue == null || "-".equals(svalue) || svalue.isEmpty()) {
return "-";
}
/* Wrap all quotes in double quotes. */
StringBuilder buffer = new StringBuilder(svalue.length() + 2);
buffer.append('\'');
int i = 0;
while (i < svalue.length()) {
int j = svalue.indexOf('\'', i);
if (j == -1) {
buffer.append(svalue.substring(i));
i = svalue.length();
} else {
buffer.append(svalue.substring(i, j + 1));
buffer.append('"');
i = j + 2;
}
}
buffer.append('\'');
return buffer.toString();
}
@Override
public void writeAttribute(HttpServerExchange exchange, String newValue) throws ReadOnlyAttributeException {
throw new ReadOnlyAttributeException();
}
public static class Wrapper implements ExchangeAttributeWrapper {
@Override
public ExchangeAttribute wrap(final ExchangeAttribute attribute) {
return new QuotingExchangeAttribute(attribute);
}
}
}