org.apache.james.jmap.methods.GetMessagesMethod.java Source code

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package org.apache.james.jmap.methods;

import java.util.List;
import java.util.Optional;
import java.util.function.Function;
import java.util.stream.Stream;

import javax.inject.Inject;

import org.apache.commons.lang.NotImplementedException;
import org.apache.james.jmap.json.FieldNamePropertyFilter;
import org.apache.james.jmap.model.ClientId;
import org.apache.james.jmap.model.GetMessagesRequest;
import org.apache.james.jmap.model.GetMessagesResponse;
import org.apache.james.jmap.model.Message;
import org.apache.james.jmap.model.MessageFactory;
import org.apache.james.jmap.model.MessageFactory.MetaDataWithContent;
import org.apache.james.jmap.model.MessageId;
import org.apache.james.jmap.model.MessageProperties;
import org.apache.james.jmap.model.MessageProperties.HeaderProperty;
import org.apache.james.mailbox.MailboxManager;
import org.apache.james.mailbox.MailboxSession;
import org.apache.james.mailbox.MessageManager;
import org.apache.james.mailbox.model.FetchGroupImpl;
import org.apache.james.mailbox.model.MailboxPath;
import org.apache.james.mailbox.model.MessageResultIterator;
import org.apache.james.util.streams.Iterators;

import com.fasterxml.jackson.databind.ser.PropertyFilter;
import com.fasterxml.jackson.databind.ser.impl.SimpleFilterProvider;
import com.github.fge.lambdas.Throwing;
import com.github.fge.lambdas.functions.ThrowingFunction;
import com.github.steveash.guavate.Guavate;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableSet;

public class GetMessagesMethod implements Method {

    public static final String HEADERS_FILTER = "headersFilter";
    private static final Method.Request.Name METHOD_NAME = Method.Request.name("getMessages");
    private static final Method.Response.Name RESPONSE_NAME = Method.Response.name("messages");
    private final MailboxManager mailboxManager;
    private final MessageFactory messageFactory;

    @Inject
    @VisibleForTesting
    GetMessagesMethod(MailboxManager mailboxManager, MessageFactory messageFactory) {
        this.mailboxManager = mailboxManager;
        this.messageFactory = messageFactory;
    }

    @Override
    public Method.Request.Name requestHandled() {
        return METHOD_NAME;
    }

    @Override
    public Class<? extends JmapRequest> requestType() {
        return GetMessagesRequest.class;
    }

    @Override
    public Stream<JmapResponse> process(JmapRequest request, ClientId clientId, MailboxSession mailboxSession) {
        Preconditions.checkNotNull(request);
        Preconditions.checkNotNull(mailboxSession);
        Preconditions.checkArgument(request instanceof GetMessagesRequest);
        GetMessagesRequest getMessagesRequest = (GetMessagesRequest) request;
        MessageProperties outputProperties = getMessagesRequest.getProperties().toOutputProperties();
        return Stream.of(JmapResponse.builder().clientId(clientId)
                .response(getMessagesResponse(mailboxSession, getMessagesRequest)).responseName(RESPONSE_NAME)
                .properties(outputProperties.getOptionalMessageProperties())
                .filterProvider(buildOptionalHeadersFilteringFilterProvider(outputProperties)).build());
    }

    private Optional<SimpleFilterProvider> buildOptionalHeadersFilteringFilterProvider(
            MessageProperties properties) {
        return properties.getOptionalHeadersProperties().map(this::buildHeadersPropertyFilter)
                .map(propertyFilter -> new SimpleFilterProvider().addFilter(HEADERS_FILTER, propertyFilter));
    }

    private PropertyFilter buildHeadersPropertyFilter(ImmutableSet<HeaderProperty> headerProperties) {
        return new FieldNamePropertyFilter(
                (fieldName) -> headerProperties.contains(HeaderProperty.fromFieldName(fieldName)));
    }

    private GetMessagesResponse getMessagesResponse(MailboxSession mailboxSession,
            GetMessagesRequest getMessagesRequest) {
        getMessagesRequest.getAccountId().ifPresent(GetMessagesMethod::notImplemented);

        Function<MessageId, Stream<MetaDataWithContent>> loadMessages = loadMessage(mailboxSession);
        Function<MetaDataWithContent, Message> convertToJmapMessage = Throwing
                .function(messageFactory::fromMetaDataWithContent).sneakyThrow();

        List<Message> result = getMessagesRequest.getIds().stream().flatMap(loadMessages).map(convertToJmapMessage)
                .collect(Guavate.toImmutableList());

        return GetMessagesResponse.builder().messages(result).expectedMessageIds(getMessagesRequest.getIds())
                .build();
    }

    private static void notImplemented(String input) {
        throw new NotImplementedException();
    }

    private Function<MessageId, Stream<MetaDataWithContent>> loadMessage(MailboxSession mailboxSession) {
        ThrowingFunction<MessageId, Stream<MetaDataWithContent>> toMetaDataWithContentStream = (
                MessageId messageId) -> {
            MailboxPath mailboxPath = messageId.getMailboxPath();
            MessageManager messageManager = mailboxManager.getMailbox(mailboxPath, mailboxSession);
            MessageResultIterator messageResultIterator = messageManager.getMessages(messageId.getUidAsRange(),
                    FetchGroupImpl.FULL_CONTENT, mailboxSession);
            return Iterators.toStream(messageResultIterator)
                    .map(Throwing.function(MetaDataWithContent::builderFromMessageResult).sneakyThrow())
                    .map(builder -> builder.mailboxId(messageManager.getId()))
                    .map(builder -> builder.messageId(messageId)).map(MetaDataWithContent.Builder::build);
        };
        return Throwing.function(toMetaDataWithContentStream).sneakyThrow();
    }
}