content: /*
   * Copyright 2010-2025 Hyland Software, Inc. and its affiliates.
   *
   * 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.activiti.core.common.spring.security;
  
  import java.security.Principal;
  import java.util.Optional;
  import org.activiti.api.runtime.shared.security.PrincipalIdentityProvider;
  import org.springframework.security.core.Authentication;
  
  public class AuthenticationPrincipalIdentityProvider implements PrincipalIdentityProvider {
  
      private static final String EMPTY_ANONYMOUS_USER_ID = "";
  
      @Override
      public String getUserId(Principal principal) {
          return Optional.of(principal)
              .filter(Authentication.class::isInstance)
              .map(Authentication.class::cast)
              .map(this::getUserId)
              .orElseThrow(this::securityException);
      }
  
      protected String getUserId(Authentication authentication) {
          return Optional.ofNullable(authentication.getName()).orElseGet(this::getAnonymousUserId);
      }
  
      protected String getAnonymousUserId() {
          return EMPTY_ANONYMOUS_USER_ID;
      }
  
      protected SecurityException securityException() {
          return new SecurityException("Invalid principal authentication object instance");
      }
  }
  