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A fresh implementation of the PayU API Client for Android

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package com.payu.sdk.api.http;

import com.squareup.okhttp.Credentials;
import com.squareup.okhttp.Request;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import okio.ByteString;

import static com.payu.sdk.api.constants.Headers.AUTHORIZATION_HEADER_NAME;
import static com.payu.sdk.api.constants.Headers.IF_MATCH_HEADER_NAME;

public abstract class PayUAuthenticator {

  private static final String ALGORITHM = "SHA-256";
  private static final String ENCODING = "UTF-8";
  private final String apiKey;
  private final String apiLogin;
  private final String fingerprint;

  public PayUAuthenticator(String apiLogin, String apiKey, String fingerprint) {
    this.apiLogin = apiLogin;
    this.apiKey = apiKey;
    this.fingerprint = fingerprint;
  }

  protected Request authRequest(Request.Builder requestBuilder) {
    AuthorizationHeader(requestBuilder);
    IfMatchHeader(requestBuilder);
    return requestBuilder.build();
  }

  private void AuthorizationHeader(Request.Builder requestBuilder) {
    requestBuilder.addHeader(AUTHORIZATION_HEADER_NAME, Credentials.basic(apiLogin, apiKey));
  }

  private void IfMatchHeader(Request.Builder requestBuilder) {
    requestBuilder.addHeader(IF_MATCH_HEADER_NAME, sha256Hex(fingerprint));
  }

  private String sha256Hex(String s) {
    try {
      MessageDigest messageDigest = MessageDigest.getInstance(ALGORITHM);
      byte[] sha256bytes = messageDigest.digest(s.getBytes(ENCODING));
      return ByteString.of(sha256bytes).hex();
    } catch (NoSuchAlgorithmException | UnsupportedEncodingException e) {
      throw new AssertionError(e);
    }
  }
}