/*
 * 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.servlet.handlers.security;

import io.undertow.security.api.SecurityContext;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.servlet.handlers.ServletRequestContext;
import io.undertow.util.StatusCodes;

This is the final HttpHandler in the security chain, it's purpose is to act as a barrier at the end of the chain to ensure authenticate is called after the mechanisms have been associated with the context and the constraint checked. This handler uses the Servlet HttpServletResponse.sendError(int) method to make sure the correct error page is displayed. 
Author:
Darran Lofthouse/**
 * This is the final {@link io.undertow.server.HttpHandler} in the security chain, it's purpose is to act as a barrier at the end of the chain to
 * ensure authenticate is called after the mechanisms have been associated with the context and the constraint checked.
 *
 * This handler uses the Servlet {@link javax.servlet.http.HttpServletResponse#sendError(int)} method to make
 * sure the correct error page is displayed.
 *
 * @author <a href="mailto:darran.lofthouse@jboss.com">Darran Lofthouse</a>
 */
public class ServletAuthenticationCallHandler implements HttpHandler {

    private final HttpHandler next;

    public ServletAuthenticationCallHandler(final HttpHandler next) {
        this.next = next;
    }

    
Only allow the request through if successfully authenticated or if authentication is not required.
See Also:
handleRequest.handleRequest(HttpServerExchange)/**
     * Only allow the request through if successfully authenticated or if authentication is not required.
     *
     * @see io.undertow.server.HttpHandler#handleRequest(io.undertow.server.HttpServerExchange)
     */
    @Override
    public void handleRequest(final HttpServerExchange exchange) throws Exception {
        if(exchange.isInIoThread()) {
            exchange.dispatch(this);
            return;
        }
        SecurityContext context = exchange.getSecurityContext();
        if (context.authenticate()) {
            if(!exchange.isComplete()) {
               next.handleRequest(exchange);
            }
        } else {
            if(exchange.getStatusCode() >= StatusCodes.BAD_REQUEST && !exchange.isComplete()) {
                ServletRequestContext src = exchange.getAttachment(ServletRequestContext.ATTACHMENT_KEY);
                src.getOriginalResponse().sendError(exchange.getStatusCode());
            } else {
                exchange.endExchange();
            }
        }
    }

}