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.services.identity.keycloak.validator;
  
  import org.activiti.cloud.services.common.security.jwt.validator.ValidationCheck;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.security.oauth2.jwt.Jwt;
  
  public class RealmValidationCheck implements ValidationCheck {
  
      protected static final Logger LOGGER = LoggerFactory.getLogger(RealmValidationCheck.class);
      private String authServerUrl;
      private final String realm;
  
      public RealmValidationCheck(String authServerUrl, String realm) {
          this.authServerUrl = authServerUrl;
          this.realm = realm;
      }
  
      @Override
      public boolean isValid(Jwt accessToken) {
          String realmUrl = this.getRealmUrl();
          if (accessToken.getIssuer() != null && !realmUrl.equals(accessToken.getIssuer().toString())) {
              LOGGER.error(
                  "Invalid token issuer. Expected '" + realmUrl + "', but was '" + accessToken.getIssuer() + "'"
              );
              return false;
          }
  
          return true;
      }
  
      public String getRealmUrl() {
          return String.format("%s/realms/%s", authServerUrl, realm);
      }
  }
  