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/**
 * ============LICENSE_START=======================================================
 * org.onap.aai
 * ================================================================================
 * Copyright © 2017-2018 AT&T 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.aai.interceptors.post;

import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
import com.google.gson.JsonObject;
import org.onap.aai.interceptors.AAIContainerFilter;
import org.onap.aai.interceptors.AAIHeaderProperties;
import org.onap.aai.logging.ErrorLogHelper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.env.Environment;

import javax.annotation.Priority;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ContainerResponseFilter;
import java.io.IOException;
import java.util.Objects;
import java.util.Optional;

@Priority(AAIResponseFilterPriority.RESPONSE_TRANS_LOGGING)
public class ResponseTransactionLogging extends AAIContainerFilter implements ContainerResponseFilter {

    private static final EELFLogger TRANSACTION_LOGGER = EELFManager.getInstance()
            .getLogger(ResponseTransactionLogging.class);

    @Autowired
    private HttpServletResponse httpServletResponse;

    @Autowired
    private Environment env;

    @Override
    public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext)
            throws IOException {

        this.transLogging(requestContext, responseContext);

    }

    private void transLogging(ContainerRequestContext requestContext, ContainerResponseContext responseContext) {

        String logValue = env.getProperty("aai.transaction.logging");
        String getValue = env.getProperty("aai.transaction.logging.get");
        String postValue = env.getProperty("aai.transaction.logging.post");

        String transId = requestContext.getHeaderString(AAIHeaderProperties.TRANSACTION_ID);
        String fromAppId = requestContext.getHeaderString(AAIHeaderProperties.FROM_APP_ID);
        String fullUri = requestContext.getUriInfo().getRequestUri().toString();
        String requestTs = (String) requestContext.getProperty(AAIHeaderProperties.AAI_REQUEST_TS);

        String httpMethod = requestContext.getMethod();

        String status = Integer.toString(responseContext.getStatus());

        String request = (String) requestContext.getProperty(AAIHeaderProperties.AAI_REQUEST);
        String response = this.getResponseString(responseContext);

        if (!Boolean.parseBoolean(logValue)) {
        } else if (!Boolean.parseBoolean(getValue) && "GET".equals(httpMethod)) {
        } else if (!Boolean.parseBoolean(postValue) && "POST".equals(httpMethod)) {
        } else {

            JsonObject logEntry = new JsonObject();
            logEntry.addProperty("transactionId", transId);
            logEntry.addProperty("status", status);
            logEntry.addProperty("rqstDate", requestTs);
            logEntry.addProperty("respDate", this.genDate());
            logEntry.addProperty("sourceId", fromAppId + ":" + transId);
            logEntry.addProperty("resourceId", fullUri);
            logEntry.addProperty("resourceType", httpMethod);
            logEntry.addProperty("rqstBuf", Objects.toString(request, ""));
            logEntry.addProperty("respBuf", Objects.toString(response, ""));

            try {
                TRANSACTION_LOGGER.debug(logEntry.toString());
            } catch (Exception e) {
                ErrorLogHelper.logError("AAI_4000", "Exception writing transaction log.");
            }
        }

    }

    private String getResponseString(ContainerResponseContext responseContext) {
        JsonObject response = new JsonObject();
        response.addProperty("ID", responseContext.getHeaderString(AAIHeaderProperties.AAI_TX_ID));
        response.addProperty("Content-Type", this.httpServletResponse.getContentType());
        response.addProperty("Response-Code", responseContext.getStatus());
        response.addProperty("Headers", responseContext.getHeaders().toString());
        Optional<Object> entityOptional = Optional.ofNullable(responseContext.getEntity());
        if (entityOptional.isPresent()) {
            response.addProperty("Entity", entityOptional.get().toString());
        } else {
            response.addProperty("Entity", "");
        }
        return response.toString();
    }

}