server/protocols/jmap-draft/src/main/java/org/apache/james/jmap/draft/model/EnvelopeUtils.java

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package org.apache.james.jmap.draft.model;

import java.util.List;
import java.util.stream.Stream;

import org.apache.james.core.MailAddress;
import org.apache.james.core.MaybeSender;
import org.apache.james.jmap.model.Emailer;
import org.apache.james.jmap.model.message.view.MessageFullView;
import org.apache.james.server.core.Envelope;
import org.apache.james.util.StreamUtils;

import com.google.common.collect.ImmutableSet;

public class EnvelopeUtils {
    public static Envelope fromMessage(MessageFullView jmapMessage) {
        MaybeSender sender = MaybeSender.of(jmapMessage.getFrom()
            .map(Emailer::toMailAddress)
            .orElseThrow(() -> new RuntimeException("Sender is mandatory")));

        Stream<MailAddress> to = emailersToMailAddresses(jmapMessage.getTo());
        Stream<MailAddress> cc = emailersToMailAddresses(jmapMessage.getCc());
        Stream<MailAddress> bcc = emailersToMailAddresses(jmapMessage.getBcc());

        return new Envelope(sender,
            StreamUtils.flatten(Stream.of(to, cc, bcc))
                .collect(ImmutableSet.toImmutableSet()));
    }

    private static Stream<MailAddress> emailersToMailAddresses(List<Emailer> emailers) {
        return emailers.stream()
            .map(Emailer::toMailAddress);
    }
}