/*
    * Copyright 2018 the original author or authors.
    *
    *  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.
   */
  
  package org.openehealth.ipf.commons.ihe.fhir;
  
  import ca.uhn.fhir.rest.api.RestOperationTypeEnum;
  import ca.uhn.fhir.rest.api.server.RequestDetails;
  import ca.uhn.fhir.rest.server.exceptions.BaseServerResponseException;
  import ca.uhn.fhir.rest.server.interceptor.InterceptorAdapter;
  import ca.uhn.fhir.rest.server.servlet.ServletRequestDetails;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  /**
   * Track the {@link RequestDetails} and make it available to downstream processing. This
   * needs to be thread local, because the request details are normally not forwarded to
   * the resource provider methods.
   *
   * @author Christian Ohr
   * @since 3.5
   */
  public class RequestDetailProvider extends InterceptorAdapter {
  
      private static ThreadLocal<RequestDetails> requestDetails = new ThreadLocal<>();
  
      public static RequestDetails getRequestDetails() {
          return requestDetails.get();
      }
  
      @Override
      public void incomingRequestPreHandled(RestOperationTypeEnum operation, ActionRequestDetails processedRequest) {
          requestDetails.set(processedRequest.getRequestDetails());
      }
  
      @Override
      public void processingCompletedNormally(ServletRequestDetails theRequestDetails) {
          requestDetails.set(null);
      }
  
      @Override
      public boolean handleException(RequestDetails theRequestDetails,
                                     BaseServerResponseException theException,
                                     HttpServletRequest theServletRequest,
                                     HttpServletResponse theServletResponse) {
          requestDetails.set(null);
          return true;
      }
  
  }