mitm.application.djigzo.james.matchers.MailVariableResolver.java Source code

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Here is the source code for mitm.application.djigzo.james.matchers.MailVariableResolver.java

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/*
 * Copyright (c) 2008-2011, Martijn Brinkers, Djigzo.
 * 
 * This file is part of Djigzo email encryption.
 *
 * Djigzo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License 
 * version 3, 19 November 2007 as published by the Free Software 
 * Foundation.
 *
 * Djigzo is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public 
 * License along with Djigzo. If not, see <http://www.gnu.org/licenses/>
 *
 * Additional permission under GNU AGPL version 3 section 7
 * 
 * If you modify this Program, or any covered work, by linking or 
 * combining it with aspectjrt.jar, aspectjweaver.jar, tyrex-1.0.3.jar, 
 * freemarker.jar, dom4j.jar, mx4j-jmx.jar, mx4j-tools.jar, 
 * spice-classman-1.0.jar, spice-loggerstore-0.5.jar, spice-salt-0.8.jar, 
 * spice-xmlpolicy-1.0.jar, saaj-api-1.3.jar, saaj-impl-1.3.jar, 
 * wsdl4j-1.6.1.jar (or modified versions of these libraries), 
 * containing parts covered by the terms of Eclipse Public License, 
 * tyrex license, freemarker license, dom4j license, mx4j license,
 * Spice Software License, Common Development and Distribution License
 * (CDDL), Common Public License (CPL) the licensors of this Program grant 
 * you additional permission to convey the resulting work.
 */
package mitm.application.djigzo.james.matchers;

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

import mitm.common.util.Check;
import net.sourceforge.jeval.VariableResolver;
import net.sourceforge.jeval.function.FunctionException;

import org.apache.commons.lang.StringUtils;
import org.apache.mailet.Mail;

/**
 * Helper class which is used by JEval to evaluate mail properties (like size etc.).
 * 
 * @author Martijn Brinkers
 *
 */
public class MailVariableResolver implements VariableResolver {
    /*
     * The property value used when the property value is null.
     */
    private static final String NULL_STRING = "'null'";

    private static final String MAIL_VAR_PREFIX = "mail.";
    private static final String SIZE = MAIL_VAR_PREFIX + "size";
    private static final String RECIPIENTS_SIZE = MAIL_VAR_PREFIX + "recipients.size";
    private static final String CONTENT_TYPE = MAIL_VAR_PREFIX + "message.contentType";
    private static final String MAIL_ATTRIBUTE_PREFIX = MAIL_VAR_PREFIX + "attribute.";

    /*
     * The mail from which properties are resolved from
     */
    private final Mail mail;

    public MailVariableResolver(Mail mail) {
        Check.notNull(mail, "mail");

        this.mail = mail;
    }

    /**
     * Returns the mail value of the mail variable. Returns null if the mail does not support a variable with the given name.
     */
    @Override
    public String resolveVariable(String variable) throws FunctionException {
        /*
         * Note: non numbers must be single quoted (ie. 'value')
         */
        try {
            /*
             * Mail vars should start with mail.
             */
            if (StringUtils.startsWithIgnoreCase(variable, MAIL_VAR_PREFIX)) {
                if (SIZE.equalsIgnoreCase(variable)) {
                    return Long.toString(mail.getMessageSize());
                } else if (RECIPIENTS_SIZE.equalsIgnoreCase(variable)) {
                    return Integer.toString(mail.getRecipients().size());
                } else if (CONTENT_TYPE.equalsIgnoreCase(variable)) {
                    MimeMessage message = mail.getMessage();

                    return message != null ? message.getContentType() : "";
                } else if (StringUtils.startsWithIgnoreCase(variable, MAIL_ATTRIBUTE_PREFIX)) {
                    /*
                     * Check to see whether Mail has an attribute with the name
                     */
                    String attrName = StringUtils.substringAfter(variable, MAIL_ATTRIBUTE_PREFIX);

                    if (StringUtils.isNotEmpty(variable)) {
                        Object attr = mail.getAttribute(attrName);

                        if (attr != null) {
                            return "'" + attr.toString() + "'";
                        }
                    }
                }

                return NULL_STRING;
            }

            return null;
        } catch (MessagingException e) {
            throw new FunctionException(e);
        }
    }
}