mitm.application.djigzo.impl.DefaultUserPreferencesSelector.java Source code

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Here is the source code for mitm.application.djigzo.impl.DefaultUserPreferencesSelector.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.impl;

import java.util.LinkedHashSet;
import java.util.Set;

import mitm.application.djigzo.DomainManager;
import mitm.application.djigzo.User;
import mitm.application.djigzo.UserPreferences;
import mitm.application.djigzo.UserPreferencesSelector;
import mitm.common.mail.EmailAddressUtils;
import mitm.common.util.Check;
import mitm.common.util.DomainUtils;

import org.apache.commons.lang.StringUtils;

/**
 * UserPreferencesSelector that selects the UserPreferences based on the domain of the email address. 
 * 
 * @author Martijn Brinkers
 *
 */
public class DefaultUserPreferencesSelector implements UserPreferencesSelector {
    private final DomainManager domainManager;

    public DefaultUserPreferencesSelector(DomainManager domainManager) {
        Check.notNull(domainManager, "domainManager");

        this.domainManager = domainManager;
    }

    /**
     * Returns a ordered (possibly empty) set of UserPreferences that match the domain of the user. A domain
     * is first matched against the wildcard domain (eg. *.example.com) and then matched agains the fully 
     * qualified domain (example.com). 
     */
    @Override
    public Set<UserPreferences> select(User user) {
        Set<UserPreferences> selected = new LinkedHashSet<UserPreferences>();

        String domain = EmailAddressUtils.getDomain(user.getEmail());

        if (StringUtils.isNotEmpty(domain)) {
            UserPreferences wildcardPreferences = domainManager.getDomainPreferences("*." + domain);

            if (wildcardPreferences == null) {
                /*
                 * Check if there is a wildcard for one level up
                 */
                String upperDomain = DomainUtils.getUpperLevelDomain(domain);

                if (StringUtils.isNotEmpty(upperDomain)) {
                    wildcardPreferences = domainManager.getDomainPreferences("*." + upperDomain);
                }
            }

            /*
             * Get the prefs of the domain itself (if present)
             */
            UserPreferences domainPreferences = domainManager.getDomainPreferences(domain);

            /* 
             * add the preferences from least specific to most specific. A wildcard domain is less
             * specific than a non wildcard domain.
             */
            if (wildcardPreferences != null) {
                selected.add(wildcardPreferences);
            }

            if (domainPreferences != null) {
                selected.add(domainPreferences);
            }
        }

        return selected;
    }
}