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CloudEventsMapper.java
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CloudEventsMapper.java
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/*
* Copyright (c) 2022 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.io.UnsupportedEncodingException;
import java.util.*;
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.internal.utils.akka.logging.DittoLogger;
import org.eclipse.ditto.internal.utils.akka.logging.DittoLoggerFactory;
import org.eclipse.ditto.json.*;
import org.eclipse.ditto.protocol.Adaptable;
import org.eclipse.ditto.protocol.JsonifiableAdaptable;
import org.eclipse.ditto.protocol.ProtocolFactory;
/**
* A message mapper implementation for the Mapping incoming CloudEvents to Ditto Protocol.
*/
@PayloadMapper(
alias = {
"CloudEvents",
// legacy full qualified name
"org.eclipse.ditto.connectivity.service.mapping.CloudEventsMapper"
})
public final class CloudEventsMapper extends AbstractMessageMapper {
static final String CE_ID = "ce-id";
static final String CE_TYPE = "ce-type";
static final String CE_SOURCE = "ce-source";
static final String CE_TIME = "ce-time";
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(
CloudEventsMapper.class.getCanonicalName(), DEFAULT_OPTIONS)
.build();
final String SPECVERSION = "specversion";
final String ID = "id";
final String SOURCE = "source";
final String TYPE = "type";
public String base64decoding(final String base64Message) throws UnsupportedEncodingException {
byte[] messageByte = Base64.getDecoder().decode(base64Message);
String decodedString = new String(messageByte);
return decodedString;
}
boolean validatePayload(String payload) {
Map<String, Object> incomingMessagePayload = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
final JsonObject jsonObject = JsonFactory.newObject(payload);
List<JsonKey> key = jsonObject.getKeys();
for (JsonKey keyIterator : key) {
Object value = jsonObject.getValue(keyIterator).orElse(null);
if (value != null) {
incomingMessagePayload.put(keyIterator.toString(), value);
}
}
if (incomingMessagePayload.get("specversion") == null
|| incomingMessagePayload.get("id") == null
|| incomingMessagePayload.get("source") == null
|| incomingMessagePayload.get("type") == null) {
return false;
} else {
return true;
}
}
private JsonifiableAdaptable extractData(final String message)
throws UnsupportedEncodingException {
final JsonObject payloadJson = JsonFactory.newObject(message);
if (payloadJson.getValue("data_base64").isPresent()) {
String base64Data = payloadJson.getValue("data_base64").orElse(null).asString();
String decodedData = base64decoding(base64Data);
final JsonifiableAdaptable decodedJsonifiableAdaptable =
DittoJsonException.wrapJsonRuntimeException(
() ->
ProtocolFactory.jsonifiableAdaptableFromJson(JsonFactory.newObject(decodedData)));
return decodedJsonifiableAdaptable;
} else {
String data = payloadJson.getValue("data").get().toString();
return DittoJsonException.wrapJsonRuntimeException(
() -> ProtocolFactory.jsonifiableAdaptableFromJson(JsonFactory.newObject(data)));
}
}
@Override
public List<Adaptable> map(final ExternalMessage message) {
// extract message as String
final String payload = extractPayloadAsString(message);
if (validatePayload(payload)) {
try {
JsonifiableAdaptable adaptable = extractData(payload);
return singletonList(ProtocolFactory.newAdaptableBuilder(adaptable).build());
} catch (Throwable e) {
e.printStackTrace();
}
}
return null;
}
@Override
public DittoHeaders getAdditionalInboundHeaders(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;
}
}