/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2012 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.security.handlers;

import io.undertow.security.api.AuthenticationMode;
import io.undertow.security.api.SecurityContext;
import io.undertow.security.idm.IdentityManager;
import io.undertow.security.impl.SecurityContextImpl;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;

/**
 * The security handler responsible for attaching the SecurityContext to the current {@link HttpServerExchange}.
 *
 * This handler is called early in the processing of the incoming request, subsequently supported authentication mechanisms will
 * be added to the context, a decision will then be made if authentication is required or optional and the associated mechanisms
 * will be called.
 *
 * In addition to the HTTPExchange authentication state can also be associated with the
 * {@link io.undertow.server.protocol.http.HttpServerConnection} and with the {@link io.undertow.server.session.Session} however this is
 * mechanism specific so it is down to the actual mechanisms to decide if there is state that can be re-used.
 *
 * @author <a href="mailto:darran.lofthouse@jboss.com">Darran Lofthouse</a>
 */
public class SecurityInitialHandler implements HttpHandler {

    private final AuthenticationMode authenticationMode;
    private final IdentityManager identityManager;
    private final HttpHandler next;
    private final String programaticMechName;

    public SecurityInitialHandler(final AuthenticationMode authenticationMode, final IdentityManager identityManager,
            final String programaticMechName, final HttpHandler next) {
        this.authenticationMode = authenticationMode;
        this.identityManager = identityManager;
        this.programaticMechName = programaticMechName;
        this.next = next;
    }

    public SecurityInitialHandler(final AuthenticationMode authenticationMode, final IdentityManager identityManager,
            final HttpHandler next) {
        this(authenticationMode, identityManager, null, next);
    }

    /**
     * @see io.undertow.server.HttpHandler#handleRequest(io.undertow.server.HttpServerExchange)
     */
    @Override
    public void handleRequest(HttpServerExchange exchange) throws Exception {
        SecurityContextImpl newContext = new SecurityContextImpl(exchange, authenticationMode, identityManager);
        if (programaticMechName != null) {
            newContext.setProgramaticMechName(programaticMechName);
        }
        exchange.putAttachment(SecurityContext.ATTACHMENT_KEY, newContext);
        next.handleRequest(exchange);
    }

}
