io.undertow.server.handlers.DisableCacheHandler Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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package io.undertow.server.handlers;

import java.util.Collections;
import java.util.Map;
import java.util.Set;

import io.undertow.server.HandlerWrapper;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.server.handlers.builder.HandlerBuilder;
import io.undertow.util.Headers;

/**
 *
 * Handler that disables response caching by browsers and proxies.
 *
 *
 * @author Stuart Douglas
 */
public class DisableCacheHandler implements HttpHandler {

    private final HttpHandler next;

    public DisableCacheHandler(HttpHandler next) {
        this.next = next;
    }

    @Override
    public void handleRequest(HttpServerExchange exchange) throws Exception {
        exchange.getResponseHeaders().add(Headers.CACHE_CONTROL, "no-cache, no-store, must-revalidate");
        exchange.getResponseHeaders().add(Headers.PRAGMA, "no-cache");
        exchange.getResponseHeaders().add(Headers.EXPIRES, "0");
        next.handleRequest(exchange);
    }

    @Override
    public String toString() {
        return "disable-cache()";
    }

    public static class Builder implements HandlerBuilder {

        @Override
        public String name() {
            return "disable-cache";
        }

        @Override
        public Map> parameters() {
            return Collections.emptyMap();
        }

        @Override
        public Set requiredParameters() {
            return Collections.emptySet();
        }

        @Override
        public String defaultParameter() {
            return null;
        }

        @Override
        public HandlerWrapper build(Map config) {
            return new Wrapper();
        }

    }

    private static class Wrapper implements HandlerWrapper {
        @Override
        public HttpHandler wrap(HttpHandler handler) {
            return new DisableCacheHandler(handler);
        }
    }
}