io.undertow.attribute.StoredResponse 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 java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import io.undertow.UndertowLogger;
import io.undertow.conduits.StoredResponseStreamSinkConduit;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.HeaderMap;
import io.undertow.util.Headers;
/**
* @author Stuart Douglas
*/
public class StoredResponse implements ExchangeAttribute {
public static final ExchangeAttribute INSTANCE = new StoredResponse();
private StoredResponse() {
}
@Override
public String readAttribute(HttpServerExchange exchange) {
byte[] data = exchange.getAttachment(StoredResponseStreamSinkConduit.RESPONSE);
if(data == null) {
return null;
}
String charset = extractCharset(exchange.getResponseHeaders());
if(charset == null) {
return null;
}
try {
return new String(data, charset);
} catch (UnsupportedEncodingException e) {
UndertowLogger.ROOT_LOGGER.debugf(e,"Could not decode response body using charset %s", charset);
return null;
}
}
private String extractCharset(HeaderMap headers) {
String contentType = headers.getFirst(Headers.CONTENT_TYPE);
if (contentType != null) {
String value = Headers.extractQuotedValueFromHeader(contentType, "charset");
if (value != null) {
return value;
}
//if it is text we default to ISO_8859_1
if(contentType.startsWith("text/")) {
return StandardCharsets.ISO_8859_1.displayName();
}
return null;
}
return null;
}
@Override
public void writeAttribute(HttpServerExchange exchange, String newValue) throws ReadOnlyAttributeException {
throw new ReadOnlyAttributeException("Stored Response", newValue);
}
@Override
public String toString() {
return "%{STORED_RESPONSE}";
}
public static class Builder implements ExchangeAttributeBuilder {
@Override
public String name() {
return "Stored Response";
}
@Override
public ExchangeAttribute build(final String token) {
if (token.equals("%{STORED_RESPONSE}")) {
return INSTANCE;
}
return null;
}
@Override
public int priority() {
return 0;
}
}
}