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Sieve.java
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Sieve.java
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/****************************************************************
* Licensed to the Apache Software Foundation (ASF) under one *
* or more contributor license agreements. See the NOTICE file *
* 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 *
* *
* http://www.apache.org/licenses/LICENSE-2.0 *
* *
* Unless required by applicable law or agreed to in writing, *
* 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 *
* specific language governing permissions and limitations *
* under the License. *
****************************************************************/
package org.apache.james.transport.mailets;
import java.util.ArrayList;
import java.util.List;
import javax.inject.Inject;
import javax.mail.MessagingException;
import org.apache.commons.logging.Log;
import org.apache.james.mailbox.model.MailboxConstants;
import org.apache.james.sieverepository.api.SieveRepository;
import org.apache.james.transport.mailets.delivery.MailStore;
import org.apache.james.transport.mailets.jsieve.CommonsLoggingAdapter;
import org.apache.james.transport.mailets.jsieve.ResourceLocator;
import org.apache.james.transport.mailets.jsieve.delivery.SieveExecutor;
import org.apache.james.transport.mailets.jsieve.delivery.SievePoster;
import org.apache.james.user.api.UsersRepository;
import org.apache.james.user.api.UsersRepositoryException;
import org.apache.mailet.Mail;
import org.apache.mailet.MailAddress;
import org.apache.mailet.base.GenericMailet;
import com.google.common.base.Predicate;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableList;
/**
* Execute Sieve scripts for incoming emails, and set the result of the execution as attributes of the mail
*/
public class Sieve extends GenericMailet {
private final UsersRepository usersRepository;
private final ResourceLocator resourceLocator;
private SieveExecutor sieveExecutor;
@Inject
public Sieve(UsersRepository usersRepository, SieveRepository sieveRepository) throws MessagingException {
this(usersRepository, new ResourceLocator(sieveRepository, usersRepository));
}
public Sieve(UsersRepository usersRepository, ResourceLocator resourceLocator) throws MessagingException {
this.usersRepository = usersRepository;
this.resourceLocator = resourceLocator;
}
@Override
public String getMailetInfo() {
return "Sieve Mailet";
}
@Override
public void init() throws MessagingException {
Log log = CommonsLoggingAdapter.builder()
.wrappedLogger(getMailetContext().getLogger())
.quiet(getInitParameter("quiet", false))
.verbose(getInitParameter("verbose", false))
.build();
sieveExecutor = SieveExecutor.builder()
.resourceLocator(resourceLocator)
.mailetContext(getMailetContext())
.log(log)
.sievePoster(new SievePoster(usersRepository, MailboxConstants.INBOX))
.build();
}
@Override
public void service(Mail mail) throws MessagingException {
List<MailAddress> recipientsWithSuccessfulSieveExecution = executeRetrieveSuccess(mail);
mail.setRecipients(keepNonDiscardedRecipients(mail, recipientsWithSuccessfulSieveExecution));
}
private List<MailAddress> executeRetrieveSuccess(Mail mail) throws MessagingException {
ImmutableList.Builder<MailAddress> recipientsWithSuccessfulSieveExecution = ImmutableList.builder();
for(MailAddress recipient: mail.getRecipients()) {
if (sieveExecutor.execute(recipient, mail)) {
recipientsWithSuccessfulSieveExecution.add(recipient);
}
}
return recipientsWithSuccessfulSieveExecution.build();
}
private ImmutableList<MailAddress> keepNonDiscardedRecipients(Mail mail, final List<MailAddress> recipientsWithSuccessfulSieveExecution) {
final List<MailAddress> discardedRecipients = retrieveDiscardedRecipients(mail);
return FluentIterable.from(mail.getRecipients())
.filter(discardPredicate(discardedRecipients, recipientsWithSuccessfulSieveExecution))
.toList();
}
private Predicate<MailAddress> discardPredicate(final List<MailAddress> discardedAddressList, final List<MailAddress> discardeableAddressList) {
return new Predicate<MailAddress>() {
@Override
public boolean apply(MailAddress input) {
return !discardeableAddressList.contains(input) || !discardedAddressList.contains(input);
}
};
}
private List<MailAddress> retrieveDiscardedRecipients(Mail mail) {
final List<MailAddress> discardedRecipients = new ArrayList<MailAddress>();
for(MailAddress recipient: mail.getRecipients()) {
if (isDiscarded(mail, recipient)) {
discardedRecipients.add(recipient);
}
}
return discardedRecipients;
}
private boolean isDiscarded(Mail mail, MailAddress recipient) {
return !(mail.getAttribute(MailStore.DELIVERY_PATH_PREFIX + retrieveUser(recipient)) instanceof String);
}
private String retrieveUser(MailAddress recipient) {
try {
return usersRepository.getUser(recipient);
} catch (UsersRepositoryException e) {
log("Can not retrieve username for mail address " + recipient.asPrettyString(), e);
return recipient.asString();
}
}
}