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The OpenWS library provides a growing set of tools to work with web services at a low level. These tools include classes for creating and reading SOAP messages, transport-independent clients for connecting to web services, and various transports for use with those clients.
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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.ws.message.handler;

import org.opensaml.ws.message.MessageContext;
import org.opensaml.ws.message.decoder.BaseMessageDecoder;
import org.opensaml.ws.message.decoder.MessageDecodingException;
import org.opensaml.xml.parse.ParserPool;
import org.opensaml.xml.security.SecurityException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Base class for message decoders which are capable of processing the message context's inbound {@link HandlerChain}.
 */
public abstract class BaseHandlerChainAwareMessageDecoder extends BaseMessageDecoder implements HandlerChainAware {
    
    /** Class logger. */
    private final Logger log = LoggerFactory.getLogger(BaseHandlerChainAwareMessageDecoder.class);
    
    /**
     * Constructor.
     *
     */
    public BaseHandlerChainAwareMessageDecoder() {
        super();
    }

    /**
     * Constructor.
     *
     * @param pool parser pool used to deserialize messages
     */
    public BaseHandlerChainAwareMessageDecoder(ParserPool pool) {
        super(pool);
    }

    /** {@inheritDoc} */
    public void decode(MessageContext messageContext) throws MessageDecodingException, SecurityException {
        log.debug("Beginning to decode message from inbound transport of type: {}", messageContext
                .getInboundMessageTransport().getClass().getName());
        
        doDecode(messageContext);
        
        logDecodedMessage(messageContext);

        processPreSecurityInboundHandlerChain(messageContext);
        log.debug("Successfully processed pre-SecurityPolicy inbound handler chain.");
        
        processSecurityPolicy(messageContext);

        processPostSecurityInboundHandlerChain(messageContext);
        log.debug("Successfully processed post-SecurityPolicy inbound handler chain.");
        
        log.debug("Successfully decoded message.");
    }
    
    /**
     * Process the pre-SecurityPolicy inbound {@link HandlerChain} for the message context, if any.
     * 
     * @param messageContext the message context to process
     * @throws MessageDecodingException thrown if a handler indicates a problem handling the message
     */
    protected void processPreSecurityInboundHandlerChain(MessageContext messageContext)
            throws MessageDecodingException {
        HandlerChainResolver inboundHandlerChainResolver = messageContext.getPreSecurityInboundHandlerChainResolver();
        if (inboundHandlerChainResolver != null) {
            log.debug("Invoking pre-SecurityPolicy inbound handler chain on message context");
            try {
                for (HandlerChain inboundHandlerChain : inboundHandlerChainResolver.resolve(messageContext)) {
                    if (inboundHandlerChain != null) {
                        invokeHandlerChain(inboundHandlerChain, messageContext);
                    }
                }
            } catch (HandlerException e) {
                log.error("Encountered pre-SecurityPolicy HandlerException when decoding message: {}", e.getMessage());
                throw new MessageDecodingException("Pre-SecurityPolicy Handler exception while decoding message", e);
            }
        }
    }
    
    /**
     * Process the post-SecurityPolicy inbound {@link HandlerChain} for the message context, if any.
     * 
     * @param messageContext the message context to process
     * @throws MessageDecodingException thrown if a handler indicates a problem handling the message
     */
    protected void processPostSecurityInboundHandlerChain(MessageContext messageContext)
            throws MessageDecodingException {
        HandlerChainResolver inboundHandlerChainResolver = messageContext.getPostSecurityInboundHandlerChainResolver();
        if (inboundHandlerChainResolver != null) {
            log.debug("Invoking post-SecurityPolicy inbound handler chain on message context");
            try {
                for (HandlerChain inboundHandlerChain : inboundHandlerChainResolver.resolve(messageContext)) {
                    if (inboundHandlerChain != null) {
                        invokeHandlerChain(inboundHandlerChain, messageContext);
                    }
                }
            } catch (HandlerException e) {
                log.error("Encountered post-SecurityPolicy HandlerException when decoding message: {}", e.getMessage());
                throw new MessageDecodingException("Handler exception while decoding message", e);
            }
        }
    }
    
    /**
     * Invoke a handler chain on the specified message context.
     * 
     * @param handlerChain the handle chain to invoke
     * @param messageContext the message context to process
     * 
     * @throws HandlerException if handler chain encountered a problem handling the message context
     */
    protected void invokeHandlerChain(HandlerChain handlerChain, MessageContext messageContext)
            throws HandlerException {
        if (handlerChain != null && messageContext != null) {
            handlerChain.invoke(messageContext);
        }
    }

}