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 * Licensed to the Apache Software Foundation (ASF) under one   *
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 * distributed with this work for additional information        *
 * regarding copyright ownership.  The ASF 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   *
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 * 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    *
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 * under the License.                                           *
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package org.apache.james.transport.matchers.smime;

import java.util.Collection;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;

import org.apache.mailet.GenericMatcher;
import org.apache.mailet.Mail;

/**
 * Checks if a mail is smime encrypted.
 * 
 */
public class IsSMIMEEncrypted extends GenericMatcher {

    /**
     * @see org.apache.mailet.Matcher#match(org.apache.mailet.Mail)
     */
    public Collection match(Mail mail) throws MessagingException {
        if (mail == null) return null;
        
        MimeMessage message = mail.getMessage();
        if (message == null) return null;
        
        if ((message.isMimeType("application/x-pkcs7-mime") 
                || message.isMimeType("application/pkcs7-mime")) && (message.getContentType().indexOf("smime-type=enveloped-data") != -1)) {
            return mail.getRecipients();
        } else return null;
    }

}