content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.apache.cassandra.sidecar.acl.authentication;
  
  import java.util.ArrayList;
  import java.util.List;
  
  import io.vertx.core.json.JsonArray;
  import io.vertx.core.json.JsonObject;
  import org.apache.cassandra.sidecar.acl.IdentityToRoleCache;
  
  /**
   * {@link JwtRoleProcessor} implementation.
   */
  public class JwtRoleProcessorImpl implements JwtRoleProcessor
  {
      private static final String SUB_KEY = "sub";
      private static final String IDENTITY_KEY = "identity";
      private static final String IDENTITIES_KEY = "identities";
      private final IdentityToRoleCache identityToRoleCache;
  
      public JwtRoleProcessorImpl(IdentityToRoleCache identityToRoleCache)
      {
          this.identityToRoleCache = identityToRoleCache;
      }
  
      @Override
      public List<String> processRoles(JsonObject decodedToken)
      {
          String identity;
          if ((identity = decodedToken.getString(IDENTITY_KEY)) != null || (identity = decodedToken.getString(SUB_KEY)) != null)
          {
              String role = identityToRoleCache.get(identity);
              return role != null ? List.of(role) : List.of();
          }
  
          JsonArray identityKeyArray = decodedToken.getJsonArray(IDENTITIES_KEY);
          List<String> roles = new ArrayList<>();
          if (identityKeyArray != null)
          {
              // noinspection unchecked
              for (String i : (List<String>) identityKeyArray.getList())
              {
                  String roleFromIdentity = identityToRoleCache.get(i);
                  if (roleFromIdentity != null)
                  {
                      roles.add(roleFromIdentity);
                  }
              }
          }
          return List.copyOf(roles);
      }
  }
  