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/*
* ============LICENSE_START=======================================================
* BBS-RELOCATION-CPE-AUTHENTICATION-HANDLER
* ================================================================================
* Copyright (C) 2019 NOKIA Intellectual Property. All rights reserved.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
* ============LICENSE_END=========================================================
*/
package org.onap.bbs.event.processor.utilities;
import static org.onap.bbs.event.processor.utilities.CommonEventFields.COMMON_EVENT_HEADER;
import static org.onap.bbs.event.processor.utilities.CommonEventFields.COMMON_FORMAT;
import static org.onap.bbs.event.processor.utilities.CommonEventFields.CORRELATION_ID;
import static org.onap.bbs.event.processor.utilities.CommonEventFields.EVENT;
import static org.onap.bbs.event.processor.utilities.CommonEventFields.SOURCE_NAME;
import static org.onap.bbs.event.processor.utilities.CpeAuthenticationEventFields.ADDITIONAL_FIELDS;
import static org.onap.bbs.event.processor.utilities.CpeAuthenticationEventFields.NEW_AUTHENTICATION_STATE;
import static org.onap.bbs.event.processor.utilities.CpeAuthenticationEventFields.OLD_AUTHENTICATION_STATE;
import static org.onap.bbs.event.processor.utilities.CpeAuthenticationEventFields.RGW_MAC_ADDRESS;
import static org.onap.bbs.event.processor.utilities.CpeAuthenticationEventFields.STATE_CHANGE_FIELDS;
import static org.onap.bbs.event.processor.utilities.CpeAuthenticationEventFields.STATE_INTERFACE;
import static org.onap.bbs.event.processor.utilities.CpeAuthenticationEventFields.SW_VERSION;
import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import java.util.Optional;
import java.util.stream.StreamSupport;
import org.onap.bbs.event.processor.exceptions.DmaapException;
import org.onap.bbs.event.processor.model.CpeAuthenticationConsumerDmaapModel;
import org.onap.bbs.event.processor.model.ImmutableCpeAuthenticationConsumerDmaapModel;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.StringUtils;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
public class CpeAuthenticationDmaapConsumerJsonParser {
private static final Logger LOGGER = LoggerFactory.getLogger(CpeAuthenticationDmaapConsumerJsonParser.class);
private static final Gson gson = new Gson();
private static final String CPE_AUTHENTICATION_DUMPING_TEMPLATE = "%n{"
+ "\"" + CORRELATION_ID + COMMON_FORMAT + ","
+ "\"" + OLD_AUTHENTICATION_STATE + COMMON_FORMAT + ","
+ "\"" + NEW_AUTHENTICATION_STATE + COMMON_FORMAT + ","
+ "\"" + STATE_INTERFACE + COMMON_FORMAT + ","
+ "\"" + RGW_MAC_ADDRESS + COMMON_FORMAT + ","
+ "\"" + SW_VERSION + COMMON_FORMAT
+ "}";
private String pnfSourceName;
private String oldAuthenticationStatus;
private String newAuthenticationStatus;
private String stateInterface;
private String rgwMacAddress;
private String swVersion;
/**
* Translates a response from DMaaP to a reactive {@link CpeAuthenticationConsumerDmaapModel} model.
* @param dmaapResponse Response from DMaaP
* @return CPE Authentication Consumer DMaaP reactive model
*/
public Flux<CpeAuthenticationConsumerDmaapModel> extractModelFromDmaap(Mono<JsonElement> dmaapResponse) {
return dmaapResponse
.flatMapMany(this::createTargetFlux);
}
private Flux<CpeAuthenticationConsumerDmaapModel> createTargetFlux(JsonElement jsonElement) {
if (jsonElement.isJsonObject()) {
return doCreateTargetFlux(Flux.defer(() -> Flux.just(jsonElement.getAsJsonObject())));
}
return doCreateTargetFlux(
Flux.defer(() -> Flux.fromStream(StreamSupport.stream(jsonElement.getAsJsonArray().spliterator(), false)
.map(jsonElementFromArray -> getJsonObjectFromAnArray(jsonElementFromArray)
.orElseGet(JsonObject::new)))));
}
private Flux<CpeAuthenticationConsumerDmaapModel> doCreateTargetFlux(Flux<JsonObject> jsonObject) {
return jsonObject
.flatMap(this::transform)
.onErrorResume(exception -> exception instanceof DmaapException, e -> Mono.empty());
}
private Mono<CpeAuthenticationConsumerDmaapModel> transform(JsonObject dmaapResponseJsonObject) {
LOGGER.trace("Event from DMaaP to be parsed: \n{}", gson.toJson(dmaapResponseJsonObject));
if (!containsProperHeaders(dmaapResponseJsonObject)) {
LOGGER.warn("Incorrect CPE Authentication JSON event - missing headers");
return Mono.empty();
}
JsonObject commonEventHeader = dmaapResponseJsonObject.getAsJsonObject(EVENT)
.getAsJsonObject(COMMON_EVENT_HEADER);
JsonObject stateChangeFields = dmaapResponseJsonObject.getAsJsonObject(EVENT)
.getAsJsonObject(STATE_CHANGE_FIELDS);
pnfSourceName = getValueFromJson(commonEventHeader, SOURCE_NAME);
oldAuthenticationStatus = getValueFromJson(stateChangeFields, OLD_AUTHENTICATION_STATE);
newAuthenticationStatus = getValueFromJson(stateChangeFields, NEW_AUTHENTICATION_STATE);
stateInterface = getValueFromJson(stateChangeFields, STATE_INTERFACE);
if (stateChangeFields.has(ADDITIONAL_FIELDS)) {
JsonObject additionalFields = stateChangeFields.getAsJsonObject(ADDITIONAL_FIELDS);
rgwMacAddress = getValueFromJson(additionalFields, RGW_MAC_ADDRESS);
swVersion = getValueFromJson(additionalFields, SW_VERSION);
}
if (StringUtils.isEmpty(pnfSourceName)
|| authenticationStatusMissing(oldAuthenticationStatus)
|| authenticationStatusMissing(newAuthenticationStatus)) {
String incorrectEvent = dumpJsonData();
LOGGER.warn("Incorrect CPE Authentication JSON event: {}", incorrectEvent);
return Mono.empty();
}
return Mono.just(ImmutableCpeAuthenticationConsumerDmaapModel.builder()
.correlationId(pnfSourceName)
.oldAuthenticationState(oldAuthenticationStatus)
.newAuthenticationState(newAuthenticationStatus)
.stateInterface(stateInterface)
.rgwMacAddress(rgwMacAddress)
.swVersion(swVersion)
.build());
}
private boolean authenticationStatusMissing(String authenticationStatus) {
return StringUtils.isEmpty(authenticationStatus);
}
private boolean containsProperHeaders(JsonObject jsonObject) {
return jsonObject.has(EVENT) && jsonObject.getAsJsonObject(EVENT).has(COMMON_EVENT_HEADER)
&& jsonObject.getAsJsonObject(EVENT).has(STATE_CHANGE_FIELDS);
}
private String dumpJsonData() {
return String.format(CPE_AUTHENTICATION_DUMPING_TEMPLATE,
pnfSourceName,
oldAuthenticationStatus,
newAuthenticationStatus,
stateInterface,
rgwMacAddress,
swVersion
);
}
Optional<JsonObject> getJsonObjectFromAnArray(JsonElement element) {
JsonParser jsonParser = new JsonParser();
return element.isJsonPrimitive() ? Optional.of(jsonParser.parse(element.getAsString()).getAsJsonObject())
: Optional.of(jsonParser.parse(element.toString()).getAsJsonObject());
}
private String getValueFromJson(JsonObject jsonObject, String jsonKey) {
return jsonObject.has(jsonKey) ? jsonObject.get(jsonKey).getAsString() : "";
}
}
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