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Direct Project policy enablement engine
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/* 
Copyright (c) 2010, NHIN Direct Project
All rights reserved.

Authors:
   Greg Meyer      [email protected]
 
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer 
in the documentation and/or other materials provided with the distribution.  Neither the name of the The NHIN Direct Project (nhindirect.org). 
nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS 
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 
THE POSSIBILITY OF SUCH DAMAGE.
*/

package org.nhindirect.policy.x509;

import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;

import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.asn1.x509.GeneralNames;

import org.nhindirect.policy.PolicyProcessException;
import org.nhindirect.policy.PolicyRequiredException;
import org.nhindirect.policy.PolicyValueFactory;

/**
 * Subject alternative name extension field.
 * 
 * The policy value of this extension is returned as a collection of strings containing a concatenation of the name type and the actual name.  For example, an alt name of rfc822
 * would look like the following.
 * 

 * 
 *   rfc822:[email protected]
 * 
 * 

 * If the extension does not exist in the certificate, then the policy value returned by this class
 * evaluates to an empty collection.
 * 
 * @author Greg Meyer
 * @since 1.0
 */
public class SubjectAltNameExtensionField extends AbstractExtensionField> implements ExtensionField>
{

	private static final long serialVersionUID = -5981093598324156863L;

	/**
	 * Constructor
	 * @param required Indicates if the field is required to be present in the certificate to be compliant with the policy.
	 */	
	public SubjectAltNameExtensionField(boolean required)
	{
		super(required);
	}
	
	/**
	 * {@inheritDoc}
	 */
	@Override
	public void injectReferenceValue(X509Certificate value) throws PolicyProcessException
	{
		this.certificate = value;
		
		final ASN1Object exValue = getExtensionValue(value);
		
		if (exValue == null)
		{
			if (isRequired())
				throw new PolicyRequiredException("Extention " + getExtentionIdentifier().getDisplay() + " is marked as required by is not present.");
			else
			{
				final Collection emptyList = Collections.emptyList();
				this.policyValue = PolicyValueFactory.getInstance(emptyList);
				return;
			}
		}
		
		final Collection names = new ArrayList();
		
		final GeneralNames generalNames = GeneralNames.getInstance(exValue);
	
		for (GeneralName name : generalNames.getNames())
		{
			final GeneralNameType type = GeneralNameType.fromTag(name.getTagNo());
			if (type != null)
			{
				names.add(type.getDisplay() + ":" + name.getName().toString());
			}
		}
		
		this.policyValue = PolicyValueFactory.getInstance(names);
	}
	
	/**
	 * {@inheritDoc}
	 */
	@Override
	public ExtensionIdentifier getExtentionIdentifier() 
	{
		return ExtensionIdentifier.SUBJECT_ALT_NAME;
	}
}