/*
 * 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.flight.auth2;

import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.function.Consumer;
import org.apache.arrow.flight.CallHeaders;

/** Client credentials that use a username and password. */
public final class BasicAuthCredentialWriter implements Consumer<CallHeaders> {

  private final String name;
  private final String password;

  public BasicAuthCredentialWriter(String name, String password) {
    this.name = name;
    this.password = password;
  }

  @Override
  public void accept(CallHeaders outputHeaders) {
    outputHeaders.insert(
        Auth2Constants.AUTHORIZATION_HEADER,
        Auth2Constants.BASIC_PREFIX
            + Base64.getEncoder()
                .encodeToString(
                    String.format("%s:%s", name, password).getBytes(StandardCharsets.UTF_8)));
  }
}
