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.camel.component.grpc.auth.jwt;
  
  import com.auth0.jwt.JWT;
  import com.auth0.jwt.algorithms.Algorithm;
  import com.auth0.jwt.exceptions.JWTCreationException;
  
  /**
   * JSON Web Token credentials generator helper
   */
  public final class JwtHelper {
      private JwtHelper() {
      }
  
      public static String createJwtToken(JwtAlgorithm algorithmName, String secret, String issuer, String subject) {
          try {
              Algorithm algorithm = selectAlgorithm(algorithmName, secret);
              return JWT.create().withIssuer(issuer).withSubject(subject).sign(algorithm);
          } catch (JWTCreationException e) {
              throw new IllegalArgumentException("Unable to create JWT token", e);
          }
      }
  
      public static Algorithm selectAlgorithm(JwtAlgorithm algorithmName, String secret)
              throws IllegalArgumentException {
          switch (algorithmName) {
              case HMAC256:
                  return Algorithm.HMAC256(secret);
              case HMAC384:
                  return Algorithm.HMAC384(secret);
              case HMAC512:
                  return Algorithm.HMAC512(secret);
              default:
                  throw new IllegalArgumentException("JWT algorithm " + algorithmName + " not implemented");
          }
      }
  }
  