content: /**
   * Copyright (c) 2018-2019, Mihai Emil Andronache
   * All rights reserved.
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   * 1)Redistributions of source code must retain the above copyright notice,
   * this list of conditions and the following disclaimer.
   * 2)Redistributions in binary form must reproduce the above copyright notice,
   * this list of conditions and the following disclaimer in the documentation
   * and/or other materials provided with the distribution.
   * 3)Neither the name of docker-java-api nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   */
  package com.amihaiemil.docker;
  
  import java.nio.charset.StandardCharsets;
  import java.util.Base64;
  import java.util.function.Supplier;
  import javax.json.Json;
  
  /**
   * An {@link Auth} supporting bare user credentials.
   * @author George Aristy (george.aristy@gmail.com)
   * @version $Id: f78bb4f26d90e43e8b0051520e2a06b289537f43 $
   * @see <a href="https://docs.docker.com/engine/api/v1.35/#section/Authentication">Authentication</a>
   * @since 0.0.1
   */
  public final class Credentials implements Auth {
      /**
       * The base64-encoded JSON structure holding the credentials.
       */
      private final Supplier<String> encoded;
  
      /**
       * Ctor.
       * @param user The username.
       * @param pwd The user's password.
       * @param email The user's email address.
       * @param server Domain/IP without a protocol.
       * @checkstyle ParameterNumber (4 lines)
       */
      public Credentials(
          final String user, final String pwd,
          final String email, final String server
      ) {
          this.encoded = () -> Base64.getEncoder().encodeToString(
              Json.createObjectBuilder()
                  .add("username", user)
                  .add("password", pwd)
                  .add("email", email)
                  .add("serveraddress", server)
                  .build().toString()
                  .getBytes(StandardCharsets.UTF_8)
          );
      }
  
      @Override
      public String headerName() {
          return "X-Registry-Auth";
      }
    
      @Override
      public String encoded() {
          return this.encoded.get();
      }
  }
  