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.ambari.server.security.authorization;
  
  import java.util.Arrays;
  
  import org.apache.commons.lang.StringUtils;
  
  /**
   * Represents an Ambari user name
   */
  public class UserName {
    private static final char[] FORBIDDEN_CHARS = {'<', '>', '&', '|', '\\', '`'};
    private final String userName;
  
    /**
     * Creates a UserName from the given string
     */
    public static UserName fromString(String userName) {
      return new UserName(validated(userName));
    }
  
    private static String validated(String userName) {
      if (StringUtils.isBlank(userName)) {
        throw new IllegalArgumentException("Username cannot be empty");
      }
      rejectIfContainsAnyOf(userName, FORBIDDEN_CHARS);
      return userName;
    }
  
    private static void rejectIfContainsAnyOf(String name, char[] forbiddenChars) {
      for (char each : forbiddenChars) {
        if (name.contains(Character.toString(each))) {
          throw new IllegalArgumentException("Invalid username: " + name + " Avoid characters " + Arrays.toString(forbiddenChars));
        }
      }
    }
  
    private UserName(String userName) {
      this.userName = userName;
    }
  
    @Override
    public String toString() {
      return userName;
    }
  
    @Override
    public boolean equals(Object o) {
      if (this == o) return true;
      if (o == null || getClass() != o.getClass()) return false;
      UserName userName1 = (UserName) o;
      return userName.equals(userName1.userName);
    }
  
    @Override
    public int hashCode() {
      return userName.hashCode();
    }
  }
  