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The official Docusign eSignature JAVA client is based on version 2.1 of the Docusign REST API and provides libraries for JAVA application integration. It is recommended that you use this version of the library for new development.

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package com.docusign.esign.client.auth;

import com.docusign.esign.client.Pair;
import java.nio.charset.StandardCharsets;
import java.util.Base64;
import java.util.List;
import java.util.Map;

/** HttpBasicAuth class. */
public class HttpBasicAuth implements Authentication {
  private String username;
  private String password;

  /**
   * getUsername method.
   *
   * @return String
   */
  public String getUsername() {
    return username;
  }

  /**
   * setUsername method.
   *
   * @param username Sets username
   */
  public void setUsername(String username) {
    this.username = username;
  }

  /**
   * getPassword method.
   *
   * @return String
   */
  public String getPassword() {
    return password;
  }

  /**
   * setPassword method.
   *
   * @param password Sets password
   */
  public void setPassword(String password) {
    this.password = password;
  }

  /**
   * applyToParams method.
   *
   * @param queryParams The query params
   * @param headerParams The header params
   */
  @Override
  public void applyToParams(List queryParams, Map headerParams) {
    if (username == null && password == null) {
      return;
    }
    String str = (username == null ? "" : username) + ":" + (password == null ? "" : password);
    headerParams.put(
        "Authorization",
        "Basic " + Base64.getEncoder().encodeToString(str.getBytes(StandardCharsets.UTF_8)));
  }
}