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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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.atlas.web.service;
  
  import com.google.common.base.Charsets;
  import org.apache.commons.lang.StringUtils;
  import org.apache.curator.framework.AuthInfo;
  import org.apache.zookeeper.ZooDefs;
  import org.apache.zookeeper.data.ACL;
  import org.apache.zookeeper.data.Id;
  
  import static com.google.common.base.Preconditions.checkArgument;
  
  /**
   * A class that parses configuration strings into Zookeeper ACL and Auth values.
   */
  public class AtlasZookeeperSecurityProperties {
      private AtlasZookeeperSecurityProperties() {
          // to block instantiation
      }
  
      public static ACL parseAcl(String aclString, ACL defaultAcl) {
          if (StringUtils.isEmpty(aclString)) {
              return defaultAcl;
          }
  
          return parseAcl(aclString);
      }
  
      /**
       * Get an {@link ACL} by parsing input string.
       * @param aclString A string of the form scheme:id
       * @return {@link ACL} with the perms set to {@link ZooDefs.Perms#ALL} and scheme and id
       *          taken from configuration values.
       */
      public static ACL parseAcl(String aclString) {
          String[] aclComponents = getComponents(aclString, "acl", "scheme:id");
  
          return new ACL(ZooDefs.Perms.ALL, new Id(aclComponents[0], aclComponents[1]));
      }
  
      /**
       * Get an {@link AuthInfo} by parsing input string.
       * @param authString A string of the form scheme:authString
       * @return {@link AuthInfo} with the scheme and auth taken from configuration values.
       */
      public static AuthInfo parseAuth(String authString) {
          String[] authComponents = getComponents(authString, "authString", "scheme:authString");
  
          return new AuthInfo(authComponents[0], authComponents[1].getBytes(Charsets.UTF_8));
      }
  
      private static String[] getComponents(String securityString, String variableName, String formatExample) {
          checkArgument(!StringUtils.isEmpty(securityString), String.format("%s cannot be null or empty. Needs to be of form %s", variableName, formatExample));
  
          String[] aclComponents = securityString.split(":", 2);
  
          if (aclComponents.length != 2) {
              throw new IllegalArgumentException(String.format("Invalid %s string. Needs to be of form %s", variableName, formatExample));
          }
  
          return aclComponents;
      }
  }
  