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package org.apache.james.jmap.draft.methods;
import java.io.Closeable;
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 jakarta.inject.Inject;
import org.apache.james.core.Username;
import org.apache.james.jmap.draft.exceptions.JmapFieldNotSupportedException;
import org.apache.james.jmap.draft.model.AuthenticatedRequest;
import org.apache.james.jmap.methods.ErrorResponse;
import org.apache.james.jmap.methods.JmapResponse;
import org.apache.james.jmap.methods.JmapResponseWriter;
import org.apache.james.jmap.methods.Method;
import org.apache.james.jmap.model.InvocationResponse;
import org.apache.james.mailbox.MailboxSession;
import org.apache.james.util.MDCBuilder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
public class RequestHandler {
private static final Logger LOGGER = LoggerFactory.getLogger(RequestHandler.class);
private final JmapRequestParser jmapRequestParser;
private final JmapResponseWriter jmapResponseWriter;
private final Map<Method.Request.Name, Method> methods;
@Inject
public RequestHandler(Set<Method> methods, JmapRequestParser jmapRequestParser, JmapResponseWriter jmapResponseWriter) {
this.jmapRequestParser = jmapRequestParser;
this.jmapResponseWriter = jmapResponseWriter;
this.methods = methods.stream()
.collect(Collectors.toMap(Method::requestHandled, Function.identity()));
}
public Flux<InvocationResponse> handle(AuthenticatedRequest request) {
Optional<MailboxSession> mailboxSession = Optional.ofNullable(request.getMailboxSession());
try (Closeable closeable =
MDCBuilder.create()
.addToContextIfPresent(MDCBuilder.USER, mailboxSession.map(MailboxSession::getUser).map(Username::asString))
.addToContextIfPresent(MDCBuilder.SESSION_ID, mailboxSession.map(MailboxSession::getSessionId)
.map(MailboxSession.SessionId::getValue)
.map(l -> Long.toString(l)))
.addToContext(MDCBuilder.ACTION, request.getMethodName().getName())
.build()) {
return Optional.ofNullable(methods.get(request.getMethodName()))
.map(extractAndProcess(request))
.map(jmapResponseWriter::formatMethodResponse)
.orElseThrow(() -> new IllegalStateException("unknown method " + request.getMethodName()));
} catch (IOException e) {
throw new RuntimeException(e);
}
}
private Function<Method, Flux<JmapResponse>> extractAndProcess(AuthenticatedRequest request) {
MailboxSession mailboxSession = request.getMailboxSession();
return (Method method) ->
Mono.fromCallable(() -> jmapRequestParser.extractJmapRequest(request, method.requestType()))
.flatMapMany(jmapRequest -> method.process(jmapRequest, request.getMethodCallId(), mailboxSession))
.onErrorResume(JmapFieldNotSupportedException.class, e -> errorNotImplemented(e, request))
.onErrorResume(
e -> e.getCause() instanceof JmapFieldNotSupportedException,
e -> errorNotImplemented((JmapFieldNotSupportedException) e.getCause(), request))
.onErrorResume(IOException.class, e -> error(request, generateInvalidArgumentError(e.getMessage())));
}
public ErrorResponse generateInvalidArgumentError(String description) {
return ErrorResponse.builder()
.type("invalidArguments")
.description(description)
.build();
}
private Flux<JmapResponse> errorNotImplemented(JmapFieldNotSupportedException error, AuthenticatedRequest request) {
return Flux.just(
JmapResponse.builder()
.methodCallId(request.getMethodCallId())
.error(generateInvalidArgumentError("The field '" + error.getField() + "' of '" + error.getIssuer() + "' is not supported"))
.build());
}
private Flux<JmapResponse> error(AuthenticatedRequest request, ErrorResponse error) {
return Flux.just(
JmapResponse.builder()
.methodCallId(request.getMethodCallId())
.error(error)
.build());
}
}