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The official DocuSign eSignature JAVA client is based on version 2 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)));
  }
}