org.apache.james.jmap.methods.RequestHandler Maven / Gradle / Ivy

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package org.apache.james.jmap.methods;

import java.io.IOException;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import javax.inject.Inject;

import org.apache.commons.lang.NotImplementedException;
import org.apache.james.jmap.model.AuthenticatedProtocolRequest;
import org.apache.james.jmap.model.ProtocolResponse;
import org.apache.james.mailbox.MailboxSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class RequestHandler {

    private static final Logger LOGGER = LoggerFactory.getLogger(RequestHandler.class);

    private final JmapRequestParser jmapRequestParser;
    private final JmapResponseWriter jmapResponseWriter;
    private final Map methods;

    @Inject
    public RequestHandler(Set methods, JmapRequestParser jmapRequestParser, JmapResponseWriter jmapResponseWriter) {
        this.jmapRequestParser = jmapRequestParser;
        this.jmapResponseWriter = jmapResponseWriter;
        this.methods = methods.stream()
                .collect(Collectors.toMap(Method::requestHandled, Function.identity()));
    }

    public Stream handle(AuthenticatedProtocolRequest request) {
        return Optional.ofNullable(methods.get(request.getMethodName()))
                        .map(extractAndProcess(request))
                        .map(jmapResponseWriter::formatMethodResponse)
                        .orElseThrow(() -> new IllegalStateException("unknown method"));
    }
    
    private Function> extractAndProcess(AuthenticatedProtocolRequest request) {
        MailboxSession mailboxSession = request.getMailboxSession();
        return (Method method) -> {
                    try {
                        JmapRequest jmapRequest = jmapRequestParser.extractJmapRequest(request, method.requestType());
                        return method.process(jmapRequest, request.getClientId(), mailboxSession);
                    } catch (IOException e) {
                        LOGGER.error("Error occured while parsing the request.", e);
                        if (e.getCause() instanceof NotImplementedException) {
                            return errorNotImplemented(request);
                        }
                        return error(request, ErrorResponse.builder()
                                                        .type("invalidArguments")
                                                        .description(e.getMessage())
                                                        .build());
                    } catch (NotImplementedException e) {
                        return errorNotImplemented(request);
                    }
                };
    }

    private Stream errorNotImplemented(AuthenticatedProtocolRequest request) {
        return Stream.of(
                JmapResponse.builder()
                    .clientId(request.getClientId())
                    .error("Not yet implemented")
                    .build());
    }

    private Stream error(AuthenticatedProtocolRequest request, ErrorResponse error) {
        return Stream.of(
                JmapResponse.builder()
                    .clientId(request.getClientId())
                    .error(error)
                    .build());
    }
}