org.apache.james.transport.matchers.SenderHostIs.java Source code

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package org.apache.james.transport.matchers;

import java.util.Collection;
import java.util.Locale;

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

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableSet;

/**
 * <p>Checkes the sender's displayed domain name against a supplied list.</p>
 *
 * <p>Sample configuration:</p>
 * <pre><code>
 * &lt;mailet match="SenderHostIs=domain.com" class="ToProcessor"&gt;
 *   &lt;processor> spam &lt;/processor&gt;
 * &lt;/mailet&gt;
 * </code></pre>
 *
 * @version 1.0.0, 2002-09-10
 */
public class SenderHostIs extends GenericMatcher {

    private Collection<String> senderHosts;

    public void init() {
        String condition = getCondition();
        Preconditions.checkNotNull(condition, "'condition' should not be null");

        senderHosts = parseDomainsList(condition);
    }

    @VisibleForTesting
    Collection<String> parseDomainsList(String condition) {
        return ImmutableSet.copyOf(Splitter.onPattern("(, |,| )").omitEmptyStrings().split(condition));
    }

    /**
     * Takes the message and checks the sender (if there is one) against
     * the vector of host names.
     *
     * Returns the collection of recipients if there's a match.
     *
     * @param mail the mail being processed
     */
    public Collection<MailAddress> match(Mail mail) {
        try {
            if (mail.getSender() != null
                    && senderHosts.contains(mail.getSender().getDomain().toLowerCase(Locale.US))) {
                return mail.getRecipients();
            }
        } catch (Exception e) {
            log(e.getMessage());
        }

        return null; //No match.
    }
}