package votorola.a.diff.harvest.auth;// Copyright 2011-2012. Christian Weilbach.  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Votorola Software"), to deal in the Votorola Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicence, and/or sell copies of the Votorola Software, and to permit persons to whom the Votorola Software is furnished to do so, subject to the following conditions: The preceding copyright notice and this permission notice shall be included in all copies or substantial portions of the Votorola Software. THE VOTOROLA SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE VOTOROLA SOFTWARE OR THE USE OR OTHER DEALINGS IN THE VOTOROLA SOFTWARE.

import votorola.a.diff.harvest.cache.AuthDiffMessage;
import votorola.a.diff.harvest.cache.DiffMessage;
import votorola.a.diff.harvest.cache.HarvestCache;
import votorola.g.lang.ThreadSafe;

/**
 * This is a trivial authenticator, which author and addressee as email.
 * 
 * @see HarvestCache
 */
public @ThreadSafe
class BasicAuthenticator implements Authenticator {

    /**
     * While officially the local part of mail (before at-sign) is
     * case-sensitive some mail providers (e.g. gmx.de) change lower-case mails
     * to first letter upper case. Since authentication is not crucial for
     * system services here, we therefore match everything by lowercase.
     */
    public AuthDiffMessage verify(final DiffMessage dmsg) throws Exception {
        final String sender = dmsg.message().mc().sender().toLowerCase();
        final String aMail = dmsg.draftPair().aCore().person().email().toLowerCase();
        final String bMail = dmsg.draftPair().bCore().person().email().toLowerCase();

        if (aMail.equals(sender)) {
            return AuthDiffMessage.create(dmsg, aMail, bMail, "a");
        } else if (bMail.equals(sender)) {
            return AuthDiffMessage.create(dmsg, bMail, aMail, "b");
        } else
            return null;
    }

}