EventDataFetcher.java

/*
 * Licensed to The Apereo Foundation under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 *
 * The Apereo Foundation licenses this file to you under the Educational
 * Community 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://opensource.org/licenses/ecl2.txt
 *
 * 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.opencastproject.graphql.datafetcher.event;

import org.opencastproject.elasticsearch.api.SearchIndexException;
import org.opencastproject.elasticsearch.api.SearchResult;
import org.opencastproject.elasticsearch.index.ElasticsearchIndex;
import org.opencastproject.elasticsearch.index.objects.event.Event;
import org.opencastproject.elasticsearch.index.objects.event.EventSearchQuery;
import org.opencastproject.graphql.datafetcher.ContextDataFetcher;
import org.opencastproject.graphql.event.GqlEvent;
import org.opencastproject.graphql.exception.GraphQLRuntimeException;
import org.opencastproject.graphql.exception.OpencastErrorType;
import org.opencastproject.graphql.execution.context.OpencastContext;
import org.opencastproject.security.api.SecurityService;

import java.util.Objects;

import graphql.schema.DataFetchingEnvironment;

/**
 * The EventDataFetcher class implements the ContextDataFetcher interface with GqlEvent as the generic type.
 * This class is used to fetch event data in a GraphQL context.
 * <p>
 * If the requested event is not found, a null value is returned.
 */
public class EventDataFetcher implements ContextDataFetcher<GqlEvent> {

  private final String eventId;

  public EventDataFetcher(String eventId) {
    Objects.requireNonNull(eventId, "Event identifier must not be null.");
    this.eventId = eventId;
  }

  @Override
  public GqlEvent get(OpencastContext opencastContext, DataFetchingEnvironment dataFetchingEnvironment) {
    SecurityService securityService = opencastContext.getService(SecurityService.class);
    ElasticsearchIndex searchIndex = opencastContext.getService(ElasticsearchIndex.class);
    var config = opencastContext.getConfiguration();
    try {
      SearchResult<Event> result = searchIndex.getByQuery(
          new EventSearchQuery(securityService.getOrganization().getId(), securityService.getUser())
              .withIdentifier(eventId)
      );
      if (result.getDocumentCount() == 0) {
        return null;
      } else if (result.getDocumentCount() == 1) {
        Event event = result.getItems()[0].getSource();
        event.updatePreview(config.eventPreviewSubtype());
        return new GqlEvent(result.getItems()[0].getSource());
      }
      throw new GraphQLRuntimeException(
          "Multiple events found with the same identifier",
          OpencastErrorType.InternalError
      );
    } catch (SearchIndexException e) {
      throw new GraphQLRuntimeException(OpencastErrorType.InternalError, e);
    }
  }

}