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.cassandra.cql3;
  
  import java.util.Optional;
  
  import org.apache.cassandra.auth.PasswordAuthenticator;
  import org.apache.cassandra.auth.RoleOptions;
  
  import static org.apache.cassandra.utils.LocalizeString.toLowerCaseLocalized;
  
  /**
   * Obfuscates passwords in a given string
   */
  public class PasswordObfuscator
  {
      public static final String OBFUSCATION_TOKEN = "*******";
      public static final String PASSWORD_TOKEN = toLowerCaseLocalized(PasswordAuthenticator.PASSWORD_KEY);
  
      /**
       * Obfuscates everything after the first appearance password token
       * 
       * @param sourceString The query to obfuscate
       * @return The obfuscated query
       */
      public static String obfuscate(String sourceString)
      {
          if (null == sourceString)
              return null;
  
          int passwordTokenStartIndex = toLowerCaseLocalized(sourceString).indexOf(PASSWORD_TOKEN);
          if (passwordTokenStartIndex < 0)
              return sourceString;
  
          return sourceString.substring(0, passwordTokenStartIndex + PASSWORD_TOKEN.length()) + " " + OBFUSCATION_TOKEN;
      }
  
      /**
       * Obfuscates the password in a query
       * 
       * @param query The query whose password to obfuscate
       * @param opts The options containing the password to obfuscate
       * @return The query with obfuscated password
       */
      public static String obfuscate(String query, RoleOptions opts)
      {
          if (opts == null || query == null || query.isEmpty())
              return query;
  
          Optional<String> pass = opts.getPassword();
          if (!pass.isPresent() || pass.get().isEmpty())
              pass = opts.getHashedPassword();
          if (!pass.isPresent() || pass.get().isEmpty())
              return query;
  
          // Regular expression:
          //  - Match new line and case insensitive (?si), and PASSWORD_TOKEN with greedy mode up to the start of the actual password and group it.
          //  - Quote the password between \Q and \E so any potential special characters are ignored
          //  - Replace the match with the grouped data + the obfuscated token
          return query.replaceAll("((?si)"+ PASSWORD_TOKEN + ".+?)\\Q" + pass.get() + "\\E",
                                  "$1" + PasswordObfuscator.OBFUSCATION_TOKEN);
      }
  }
  