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/*
 * Licensed to the University Corporation for Advanced Internet Development, 
 * Inc. (UCAID) under one or more contributor license agreements.  See the 
 * NOTICE file distributed with this work for additional information regarding
 * copyright ownership. The UCAID licenses this file to You 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 org.opensaml.saml.saml1.profile.impl;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

import net.shibboleth.utilities.java.support.component.ComponentSupport;
import net.shibboleth.utilities.java.support.logic.Constraint;
import net.shibboleth.utilities.java.support.security.IdentifierGenerationStrategy;
import net.shibboleth.utilities.java.support.security.SecureRandomIdentifierGenerationStrategy;

import org.joda.time.DateTime;
import org.joda.time.chrono.ISOChronology;
import org.opensaml.core.xml.XMLObjectBuilderFactory;
import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
import org.opensaml.messaging.context.MessageContext;
import org.opensaml.profile.action.AbstractProfileAction;
import org.opensaml.profile.action.ActionSupport;
import org.opensaml.profile.action.EventIds;
import org.opensaml.profile.context.ProfileRequestContext;
import org.opensaml.saml.common.SAMLObjectBuilder;
import org.opensaml.saml.common.SAMLVersion;
import org.opensaml.saml.saml1.core.Response;
import org.opensaml.saml.saml1.core.Status;
import org.opensaml.saml.saml1.core.StatusCode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Function;

/**
 * Action that creates an empty {@link Response}, and sets it as the
 * message returned by {@link ProfileRequestContext#getOutboundMessageContext()}.
 * 
 * The {@link Status} is set to {@link StatusCode#SUCCESS} as a default assumption,
 * and this can be overridden by subsequent actions.
 * 
 * @event {@link EventIds#PROCEED_EVENT_ID}
 * @event {@link EventIds#INVALID_MSG_CTX}
 * @event {@link EventIds#INVALID_PROFILE_CTX}
 * 
 * @post ProfileRequestContext.getOutboundMessageContext().getMessage() != null
 */
public class AddResponseShell extends AbstractProfileAction {

    /** Class logger. */
    @Nonnull private Logger log = LoggerFactory.getLogger(AddResponseShell.class);

    /** Strategy used to locate the {@link IdentifierGenerationStrategy} to use. */
    @Nonnull private Function idGeneratorLookupStrategy;

    /** Overwrite an existing message? */
    private boolean overwriteExisting;
    
    /** The generator to use. */
    @Nullable private IdentifierGenerationStrategy idGenerator;
    
    /** Constructor. */
    public AddResponseShell() {
        // Default strategy is a 16-byte secure random source.
        idGeneratorLookupStrategy = new Function() {
            public IdentifierGenerationStrategy apply(ProfileRequestContext input) {
                return new SecureRandomIdentifierGenerationStrategy();
            }
        };
    }
    
    /**
     * Set whether to overwrite an existing message.
     * 
     * @param flag flag to set
     */
    public void setOverwriteExisting(final boolean flag) {
        ComponentSupport.ifInitializedThrowUnmodifiabledComponentException(this);
        
        overwriteExisting = flag;
    }
    
    /**
     * Set the strategy used to locate the {@link IdentifierGenerationStrategy} to use.
     * 
     * @param strategy lookup strategy
     */
    public void setIdentifierGeneratorLookupStrategy(
            @Nonnull final Function strategy) {
        ComponentSupport.ifInitializedThrowUnmodifiabledComponentException(this);

        idGeneratorLookupStrategy =
                Constraint.isNotNull(strategy, "IdentifierGenerationStrategy lookup strategy cannot be null");
    }
    
    /** {@inheritDoc} */
    @Override
    protected boolean doPreExecute(@Nonnull final ProfileRequestContext profileRequestContext) {
        
        final MessageContext outboundMessageCtx = profileRequestContext.getOutboundMessageContext();
        if (outboundMessageCtx == null) {
            log.debug("{} No outbound message context", getLogPrefix());
            ActionSupport.buildEvent(profileRequestContext, EventIds.INVALID_MSG_CTX);
            return false;
        } else if (!overwriteExisting && outboundMessageCtx.getMessage() != null) {
            log.debug("{} Outbound message context already contains a Response", getLogPrefix());
            ActionSupport.buildEvent(profileRequestContext, EventIds.INVALID_MSG_CTX);
            return false;
        }
        
        idGenerator = idGeneratorLookupStrategy.apply(profileRequestContext);
        if (idGenerator == null) {
            log.debug("{} No identifier generation strategy", getLogPrefix());
            ActionSupport.buildEvent(profileRequestContext, EventIds.INVALID_PROFILE_CTX);
            return false;
        }
        
        outboundMessageCtx.setMessage(null);
        
        return super.doPreExecute(profileRequestContext);
    }

    /** {@inheritDoc} */
    @Override
    protected void doExecute(@Nonnull final ProfileRequestContext profileRequestContext) {

        final XMLObjectBuilderFactory bf = XMLObjectProviderRegistrySupport.getBuilderFactory();
        final SAMLObjectBuilder statusCodeBuilder =
                (SAMLObjectBuilder) bf.getBuilderOrThrow(StatusCode.DEFAULT_ELEMENT_NAME);
        final SAMLObjectBuilder statusBuilder =
                (SAMLObjectBuilder) bf.getBuilderOrThrow(Status.DEFAULT_ELEMENT_NAME);
        final SAMLObjectBuilder responseBuilder =
                (SAMLObjectBuilder) bf.getBuilderOrThrow(Response.DEFAULT_ELEMENT_NAME);

        final StatusCode statusCode = statusCodeBuilder.buildObject();
        statusCode.setValue(StatusCode.SUCCESS);

        final Status status = statusBuilder.buildObject();
        status.setStatusCode(statusCode);

        final Response response = responseBuilder.buildObject();

        response.setID(idGenerator.generateIdentifier());
        response.setIssueInstant(new DateTime(ISOChronology.getInstanceUTC()));
        response.setStatus(status);
        response.setVersion(SAMLVersion.VERSION_11);

        profileRequestContext.getOutboundMessageContext().setMessage(response);
    }

}