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package org.scribe.services;

import javax.crypto.*;
import javax.crypto.spec.*;

import org.scribe.exceptions.*;
import org.scribe.utils.*;

/**
 * HMAC-SHA1 implementation of {@SignatureService}
 * 
 * @author Pablo Fernandez
 *
 */
public class HMACSha1SignatureService implements SignatureService
{
  private static final String EMPTY_STRING = "";
  private static final String CARRIAGE_RETURN = "\r\n";
  private static final String UTF8 = "UTF-8";
  private static final String HMAC_SHA1 = "HmacSHA1";
  private static final String METHOD = "HMAC-SHA1";

  /**
   * {@inheritDoc}
   */
  public String getSignature(String baseString, String apiSecret, String tokenSecret)
  {
    try
    {
      Preconditions.checkEmptyString(baseString, "Base string cant be null or empty string");
      Preconditions.checkEmptyString(apiSecret, "Api secret cant be null or empty string");
      return doSign(baseString, OAuthEncoder.encode(apiSecret) + '&' + OAuthEncoder.encode(tokenSecret));
    } 
    catch (Exception e)
    {
      throw new OAuthSignatureException(baseString, e);
    }
  }

  private String doSign(String toSign, String keyString) throws Exception
  {
    SecretKeySpec key = new SecretKeySpec((keyString).getBytes(UTF8), HMAC_SHA1);
    Mac mac = Mac.getInstance(HMAC_SHA1);
    mac.init(key);
    byte[] bytes = mac.doFinal(toSign.getBytes(UTF8));
    return bytesToBase64String(bytes).replace(CARRIAGE_RETURN, EMPTY_STRING);
  }

  private String bytesToBase64String(byte[] bytes)
  {
    return Base64Encoder.getInstance().encode(bytes);
  }

  /**
   * {@inheritDoc}
   */
  public String getSignatureMethod()
  {
    return METHOD;
  }
}