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 com.alibaba.cloudapp.api.gateway.authentication;
  
  import com.alibaba.cloudapp.exeption.CloudAppException;
  import org.springframework.http.HttpRequest;
  import org.springframework.util.StringUtils;
  
  public class APIKeyAuthorizer implements Authorizer {
  
      private static final String API_KEY_HEADER = "X-API-KEY";
  
      private final String apiKey;
      private final String apiKeyHeader;
  
      public APIKeyAuthorizer(String apiKey) {
          this(apiKey, API_KEY_HEADER);
      }
  
      public APIKeyAuthorizer(String apiKey, String apiKeyHeader) {
          this.apiKey = apiKey;
          if(StringUtils.hasText(apiKeyHeader)) {
              this.apiKeyHeader = apiKeyHeader;
          } else {
              this.apiKeyHeader = API_KEY_HEADER;
          }
      }
  
      @Override
      public void applyAuthorization(HttpRequest request) throws CloudAppException {
          if (apiKey == null || apiKey.isEmpty()) {
              throw new CloudAppException("API key is not set", "CloudApp.ApiKeyNotSet");
          }
  
          request.getHeaders().add(apiKeyHeader, apiKey);
      }
  
      public String getHeaderName() {
          return apiKeyHeader;
      }
  }
  
  