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DittoMessageMapper.java
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DittoMessageMapper.java
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/*
* Copyright (c) 2017 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.connectivity.service.mapping;
import static java.util.Collections.singletonList;
import java.util.List;
import org.eclipse.ditto.base.model.common.DittoConstants;
import org.eclipse.ditto.base.model.exceptions.DittoJsonException;
import org.eclipse.ditto.base.model.headers.DittoHeaders;
import org.eclipse.ditto.connectivity.api.ExternalMessage;
import org.eclipse.ditto.connectivity.api.ExternalMessageFactory;
import org.eclipse.ditto.connectivity.model.ConnectivityModelFactory;
import org.eclipse.ditto.connectivity.model.MappingContext;
import org.eclipse.ditto.json.JsonFactory;
import org.eclipse.ditto.json.JsonObject;
import org.eclipse.ditto.protocol.Adaptable;
import org.eclipse.ditto.protocol.JsonifiableAdaptable;
import org.eclipse.ditto.protocol.ProtocolFactory;
import com.typesafe.config.Config;
import akka.actor.ActorSystem;
/**
* A message mapper implementation for the Ditto Protocol.
* Expect messages to contain a JSON serialized Ditto Protocol message.
*/
public final class DittoMessageMapper extends AbstractMessageMapper {
/**
* The alias of this mapper.
*/
public static final String ALIAS = "Ditto";
static final JsonObject DEFAULT_OPTIONS = JsonObject.newBuilder()
.set(MessageMapperConfiguration.CONTENT_TYPE_BLOCKLIST,
String.join(",", "application/vnd.eclipse-hono-empty-notification",
"application/vnd.eclipse-hono-device-provisioning-notification",
"application/vnd.eclipse-hono-dc-notification+json",
"application/vnd.eclipse-hono-delivery-failure-notification+json"
))
.build();
/**
* The context representing this mapper
*/
public static final MappingContext CONTEXT = ConnectivityModelFactory.newMappingContextBuilder(
DittoMessageMapper.class.getCanonicalName(),
DEFAULT_OPTIONS)
.build();
/**
* Constructs a new instance of DittoMessageMapper extension.
*
* @param actorSystem the actor system in which to load the extension.
* @param config the configuration for this extension.
*/
public DittoMessageMapper(final ActorSystem actorSystem, final Config config) {
super(actorSystem, config);
}
private DittoMessageMapper(final DittoMessageMapper copyFromMapper) {
super(copyFromMapper);
}
@Override
public String getAlias() {
return ALIAS;
}
@Override
public boolean isConfigurationMandatory() {
return false;
}
@Override
public MessageMapper createNewMapperInstance() {
return new DittoMessageMapper(this);
}
@Override
public List<Adaptable> map(final ExternalMessage message) {
final String payload = extractPayloadAsString(message);
final JsonifiableAdaptable jsonifiableAdaptable = DittoJsonException.wrapJsonRuntimeException(() ->
ProtocolFactory.jsonifiableAdaptableFromJson(JsonFactory.newObject(payload))
);
final DittoHeaders mergedHeaders = jsonifiableAdaptable.getDittoHeaders();
return singletonList(
ProtocolFactory.newAdaptableBuilder(jsonifiableAdaptable).withHeaders(mergedHeaders).build());
}
@Override
public DittoHeaders getAdditionalInboundHeaders(final ExternalMessage message) {
return DittoHeaders.empty();
}
@Override
public List<ExternalMessage> map(final Adaptable adaptable) {
return List.of(ExternalMessageFactory.newExternalMessageBuilder(getExternalDittoHeaders(adaptable))
.withTopicPath(adaptable.getTopicPath())
.withText(getJsonString(adaptable))
.asResponse(isResponse(adaptable))
.asError(isError(adaptable))
.build());
}
private static DittoHeaders getExternalDittoHeaders(final Adaptable adaptable) {
return DittoHeaders.newBuilder()
.contentType(DittoConstants.DITTO_PROTOCOL_CONTENT_TYPE)
.correlationId(adaptable.getDittoHeaders().getCorrelationId().orElse(null))
.build();
}
private static String getJsonString(final Adaptable adaptable) {
final var jsonifiableAdaptable = ProtocolFactory.wrapAsJsonifiableAdaptable(adaptable);
return jsonifiableAdaptable.toJsonString();
}
@Override
public JsonObject getDefaultOptions() {
return DEFAULT_OPTIONS;
}
@Override
public String toString() {
return getClass().getSimpleName() + " [" + super.toString() + "]";
}
}