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.arrow.driver.jdbc.authentication;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Properties;
  import org.apache.arrow.driver.jdbc.utils.ArrowFlightConnectionConfigImpl;
  import org.apache.arrow.flight.CallStatus;
  import org.apache.arrow.flight.auth2.BasicCallHeaderAuthenticator;
  import org.apache.arrow.flight.auth2.CallHeaderAuthenticator;
  import org.apache.arrow.flight.auth2.GeneratedBearerTokenAuthenticator;
  
  public class UserPasswordAuthentication implements Authentication {
  
    private final Map<String, String> validCredentials;
  
    public UserPasswordAuthentication(Map<String, String> validCredentials) {
      this.validCredentials = validCredentials;
    }
  
    private String getCredentials(String key) {
      return validCredentials.getOrDefault(key, null);
    }
  
    @Override
    public CallHeaderAuthenticator authenticate() {
      return new GeneratedBearerTokenAuthenticator(
          new BasicCallHeaderAuthenticator(
              (username, password) -> {
                if (validCredentials.containsKey(username)
                    && getCredentials(username).equals(password)) {
                  return () -> username;
                }
                throw CallStatus.UNAUTHENTICATED
                    .withDescription("Invalid credentials.")
                    .toRuntimeException();
              }));
    }
  
    @Override
    public void populateProperties(Properties properties) {
      validCredentials.forEach(
          (key, value) -> {
            properties.put(
                ArrowFlightConnectionConfigImpl.ArrowFlightConnectionProperty.USER.camelName(), key);
            properties.put(
                ArrowFlightConnectionConfigImpl.ArrowFlightConnectionProperty.PASSWORD.camelName(),
                value);
          });
    }
  
    public static class Builder {
      Map<String, String> credentials = new HashMap<>();
  
      public Builder user(String username, String password) {
        credentials.put(username, password);
        return this;
      }
  
      public UserPasswordAuthentication build() {
        return new UserPasswordAuthentication(credentials);
      }
    }
  }
  