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| * distributed with this work for additional information * |
| * regarding copyright ownership. The ASF licenses this file * |
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| * "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 * |
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| * Unless required by applicable law or agreed to in writing, * |
| * software distributed under the License is distributed on an * |
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| * specific language governing permissions and limitations * |
| * under the License. * |
| ****************************************************************/ |
| |
| package org.apache.james.transport.mailets; |
| |
| import java.util.Collection; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Optional; |
| import java.util.Set; |
| import java.util.function.Function; |
| import java.util.function.Supplier; |
| import java.util.stream.Collectors; |
| import java.util.stream.Stream; |
| |
| import javax.mail.MessagingException; |
| |
| import org.apache.commons.lang3.NotImplementedException; |
| import org.apache.commons.lang3.tuple.Pair; |
| import org.apache.james.core.Domain; |
| import org.apache.james.core.MailAddress; |
| import org.apache.james.domainlist.api.DomainList; |
| import org.apache.james.domainlist.api.DomainListException; |
| import org.apache.james.lifecycle.api.LifecycleUtil; |
| import org.apache.james.rrt.api.RecipientRewriteTable; |
| import org.apache.james.rrt.api.RecipientRewriteTable.ErrorMappingException; |
| import org.apache.james.rrt.api.RecipientRewriteTableException; |
| import org.apache.james.rrt.lib.Mapping; |
| import org.apache.james.rrt.lib.Mappings; |
| import org.apache.james.server.core.MailImpl; |
| import org.apache.james.util.MemoizedSupplier; |
| import org.apache.mailet.DsnParameters; |
| import org.apache.mailet.DsnParameters.RecipientDsnParameters; |
| import org.apache.mailet.Mail; |
| import org.apache.mailet.MailetContext; |
| import org.apache.mailet.ProcessingState; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.github.fge.lambdas.Throwing; |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.ImmutableList; |
| import com.google.common.collect.ImmutableListMultimap; |
| import com.google.common.collect.ImmutableMap; |
| import com.google.common.collect.ImmutableSet; |
| |
| public class RecipientRewriteTableProcessor { |
| private static final Logger LOGGER = LoggerFactory.getLogger(RecipientRewriteTableProcessor.class); |
| |
| private static class Decision { |
| private final MailAddress originalAddress; |
| private final RrtExecutionResult executionResult; |
| |
| private Decision(MailAddress originalAddress, RrtExecutionResult executionResult) { |
| this.originalAddress = originalAddress; |
| this.executionResult = executionResult; |
| } |
| |
| MailAddress originalAddress() { |
| return originalAddress; |
| } |
| |
| RrtExecutionResult executionResult() { |
| return executionResult; |
| } |
| |
| DsnParameters applyOnDsnParameters(DsnParameters dsnParameters) { |
| ImmutableMap<MailAddress, RecipientDsnParameters> rcptParameters = dsnParameters.getRcptParameters(); |
| |
| Optional<RecipientDsnParameters> originalRcptParameter = Optional.ofNullable(rcptParameters.get(originalAddress)); |
| |
| return originalRcptParameter.map(parameters -> { |
| Map<MailAddress, RecipientDsnParameters> newRcptParameters = executionResult.getNewRecipients().stream() |
| .map(newRcpt -> Pair.of(newRcpt, parameters)) |
| .collect(ImmutableMap.toImmutableMap(Pair::getKey, Pair::getValue)); |
| Map<MailAddress, RecipientDsnParameters> rcptParametersWithoutOriginal = rcptParameters.entrySet().stream() |
| .filter(rcpt -> !rcpt.getKey().equals(originalAddress)) |
| .collect(ImmutableMap.toImmutableMap(Map.Entry::getKey, Map.Entry::getValue)); |
| |
| return dsnParameters.withRcptParameters(ImmutableMap.<MailAddress, RecipientDsnParameters>builder() |
| .putAll(rcptParametersWithoutOriginal) |
| .putAll(newRcptParameters) |
| .build()); |
| }).orElse(dsnParameters); |
| } |
| } |
| |
| private static class RrtExecutionResult { |
| private static RrtExecutionResult empty() { |
| return new RrtExecutionResult(ImmutableSet.of(), ImmutableSet.of()); |
| } |
| |
| private static RrtExecutionResult error(MailAddress mailAddress) { |
| return new RrtExecutionResult(ImmutableSet.of(), ImmutableSet.of(mailAddress)); |
| } |
| |
| private static RrtExecutionResult success(MailAddress mailAddress) { |
| return new RrtExecutionResult(ImmutableSet.of(mailAddress), ImmutableSet.of()); |
| } |
| |
| private static RrtExecutionResult success(List<MailAddress> mailAddresses) { |
| return new RrtExecutionResult(ImmutableSet.copyOf(mailAddresses), ImmutableSet.of()); |
| } |
| |
| private static RrtExecutionResult merge(RrtExecutionResult result1, RrtExecutionResult result2) { |
| return new RrtExecutionResult( |
| ImmutableSet.<MailAddress>builder() |
| .addAll(result1.getNewRecipients()) |
| .addAll(result2.getNewRecipients()) |
| .build(), |
| ImmutableSet.<MailAddress>builder() |
| .addAll(result1.getRecipientWithError()) |
| .addAll(result2.getRecipientWithError()) |
| .build()); |
| } |
| |
| private final ImmutableSet<MailAddress> newRecipients; |
| private final ImmutableSet<MailAddress> recipientWithError; |
| |
| public RrtExecutionResult(ImmutableSet<MailAddress> newRecipients, ImmutableSet<MailAddress> recipientWithError) { |
| this.newRecipients = newRecipients; |
| this.recipientWithError = recipientWithError; |
| } |
| |
| public Set<MailAddress> getNewRecipients() { |
| return newRecipients; |
| } |
| |
| public Set<MailAddress> getRecipientWithError() { |
| return recipientWithError; |
| } |
| |
| } |
| |
| private final RecipientRewriteTable virtualTableStore; |
| private final MailetContext mailetContext; |
| private final Supplier<Domain> defaultDomainSupplier; |
| private final ProcessingState errorProcessor; |
| |
| public RecipientRewriteTableProcessor(RecipientRewriteTable virtualTableStore, DomainList domainList, MailetContext mailetContext, ProcessingState errorProcessor) { |
| this.virtualTableStore = virtualTableStore; |
| this.mailetContext = mailetContext; |
| this.defaultDomainSupplier = MemoizedSupplier.of( |
| Throwing.supplier(() -> getDefaultDomain(domainList)).sneakyThrow()); |
| this.errorProcessor = errorProcessor; |
| } |
| |
| public RecipientRewriteTableProcessor(RecipientRewriteTable virtualTableStore, DomainList domainList, MailetContext mailetContext) { |
| this(virtualTableStore, domainList, mailetContext, new ProcessingState(Mail.ERROR)); |
| } |
| |
| private Domain getDefaultDomain(DomainList domainList) throws MessagingException { |
| try { |
| return domainList.getDefaultDomain(); |
| } catch (DomainListException e) { |
| throw new MessagingException("Unable to access DomainList", e); |
| } |
| } |
| |
| public void processMail(Mail mail) throws MessagingException { |
| List<Decision> decisions = executeRrtFor(mail); |
| |
| applyDecisionsOnMailRecipients(mail, decisions); |
| applyDecisionOnDSNParameters(mail, decisions); |
| } |
| |
| private void applyDecisionOnDSNParameters(Mail mail, List<Decision> decisions) { |
| mail.dsnParameters() |
| .map(dsnParameters -> decisions.stream() |
| .reduce(dsnParameters, (parameters, decision) -> decision.applyOnDsnParameters(parameters), (a, b) -> { |
| throw new NotImplementedException("No combiner needed as we are not in a multi-threaded environment"); |
| })) |
| .ifPresent(mail::setDsnParameters); |
| } |
| |
| private void applyDecisionsOnMailRecipients(Mail mail, List<Decision> decisions) throws MessagingException { |
| RrtExecutionResult executionResults = decisions.stream() |
| .map(Decision::executionResult) |
| .reduce(RrtExecutionResult.empty(), RrtExecutionResult::merge); |
| |
| if (!executionResults.recipientWithError.isEmpty()) { |
| MailImpl newMail = MailImpl.builder() |
| .name(mail.getName()) |
| .sender(mail.getMaybeSender()) |
| .addRecipients(executionResults.recipientWithError) |
| .mimeMessage(mail.getMessage()) |
| .state(errorProcessor.getValue()) |
| .build(); |
| mailetContext.sendMail(newMail); |
| LifecycleUtil.dispose(newMail); |
| } |
| |
| if (executionResults.newRecipients.isEmpty()) { |
| mail.setState(Mail.GHOST); |
| } |
| |
| mail.setRecipients(executionResults.newRecipients); |
| } |
| |
| private List<Decision> executeRrtFor(Mail mail) { |
| Function<MailAddress, Decision> convertToMappingData = recipient -> { |
| Preconditions.checkNotNull(recipient); |
| |
| return executeRrtForRecipient(mail, recipient); |
| }; |
| |
| return mail.getRecipients() |
| .stream() |
| .map(convertToMappingData) |
| .collect(ImmutableList.toImmutableList()); |
| } |
| |
| private Decision executeRrtForRecipient(Mail mail, MailAddress recipient) { |
| try { |
| Mappings mappings = virtualTableStore.getResolvedMappings(recipient.getLocalPart(), recipient.getDomain()); |
| |
| if (mappings != null && !mappings.isEmpty()) { |
| List<MailAddress> newMailAddresses = handleMappings(mappings, mail, recipient); |
| return new Decision(recipient, RrtExecutionResult.success(newMailAddresses)); |
| } |
| return new Decision(recipient, RrtExecutionResult.success(recipient)); |
| } catch (ErrorMappingException | RecipientRewriteTableException e) { |
| LOGGER.warn("Could not rewrite recipient {}", recipient, e); |
| return new Decision(recipient, RrtExecutionResult.error(recipient)); |
| } |
| } |
| |
| @VisibleForTesting |
| List<MailAddress> handleMappings(Mappings mappings, Mail mail, MailAddress recipient) { |
| boolean isLocal = true; |
| Map<Boolean, List<MailAddress>> mailAddressSplit = splitRemoteMailAddresses(mappings); |
| |
| forwardToRemoteAddress(mail, recipient, mailAddressSplit.get(!isLocal)); |
| |
| return mailAddressSplit.get(isLocal); |
| } |
| |
| private ImmutableMap<Boolean, List<MailAddress>> splitRemoteMailAddresses(Mappings mappings) { |
| return mailAddressesPerDomain(mappings) |
| .collect(Collectors.partitioningBy(entry -> mailetContext.isLocalServer(entry.getKey()))) |
| .entrySet() |
| .stream() |
| .collect(ImmutableMap.toImmutableMap( |
| Map.Entry::getKey, |
| entry -> entry.getValue() |
| .stream() |
| .flatMap(domainEntry -> domainEntry.getValue().stream()) |
| .collect(ImmutableList.toImmutableList()))); |
| } |
| |
| private Stream<Map.Entry<Domain, Collection<MailAddress>>> mailAddressesPerDomain(Mappings mappings) { |
| return mappings.asStream() |
| .map(mapping -> mapping.appendDomainIfNone(defaultDomainSupplier)) |
| .map(Mapping::asMailAddress) |
| .flatMap(Optional::stream) |
| .collect(ImmutableListMultimap.toImmutableListMultimap( |
| MailAddress::getDomain, Function.identity())) |
| .asMap() |
| .entrySet() |
| .stream(); |
| } |
| |
| private void forwardToRemoteAddress(Mail mail, MailAddress recipient, Collection<MailAddress> remoteRecipients) { |
| if (!remoteRecipients.isEmpty()) { |
| Mail duplicate = null; |
| try { |
| duplicate = mail.duplicate(); |
| duplicate.setRecipients(ImmutableList.copyOf(remoteRecipients)); |
| mailetContext.sendMail(duplicate); |
| LOGGER.info("Mail for {} forwarded to {}", recipient, remoteRecipients); |
| } catch (MessagingException ex) { |
| LOGGER.warn("Error forwarding mail to {}", remoteRecipients); |
| } finally { |
| LifecycleUtil.dispose(duplicate); |
| } |
| } |
| } |
| |
| } |