content: /*
   * Copyright 2017-2025 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.cloud.security.feign;
  
  import java.util.Optional;
  import org.springframework.security.oauth2.client.OAuth2AuthorizeRequest;
  import org.springframework.security.oauth2.client.OAuth2AuthorizedClient;
  import org.springframework.security.oauth2.client.OAuth2AuthorizedClientManager;
  import org.springframework.security.oauth2.client.registration.ClientRegistration;
  import org.springframework.security.oauth2.core.OAuth2AccessToken;
  
  /**
   * Feign request interceptor for forwarding the bearer token
   */
  public class ClientCredentialsAuthRequestInterceptor implements AuthTokenRequestInterceptor {
  
      private final OAuth2AuthorizedClientManager authorizedClientManager;
      private final ClientRegistration clientRegistration;
  
      public ClientCredentialsAuthRequestInterceptor(
          OAuth2AuthorizedClientManager authorizedClientManager,
          ClientRegistration clientRegistration
      ) {
          this.authorizedClientManager = authorizedClientManager;
          this.clientRegistration = clientRegistration;
      }
  
      @Override
      public Optional<String> getToken() {
          OAuth2AuthorizeRequest oAuth2AuthorizeRequest = OAuth2AuthorizeRequest
              .withClientRegistrationId(clientRegistration.getRegistrationId())
              .principal("activiti")
              .build();
  
          OAuth2AuthorizedClient client = authorizedClientManager.authorize(oAuth2AuthorizeRequest);
          OAuth2AccessToken accessToken = client.getAccessToken();
          return Optional.of(accessToken.getTokenValue());
      }
  }
  