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package com.github.binarywang.wxpay.v3.auth;

import me.chanjar.weixin.common.error.WxRuntimeException;

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.Signature;
import java.security.SignatureException;
import java.util.Base64;

public class PrivateKeySigner implements Signer {
  private String certificateSerialNumber;

  private PrivateKey privateKey;

  public PrivateKeySigner(String serialNumber, PrivateKey privateKey) {
    this.certificateSerialNumber = serialNumber;
    this.privateKey = privateKey;
  }

  @Override
  public SignatureResult sign(byte[] message) {
    try {
      Signature sign = Signature.getInstance("SHA256withRSA");
      sign.initSign(privateKey);
      sign.update(message);

      return new SignatureResult(
          Base64.getEncoder().encodeToString(sign.sign()), certificateSerialNumber);
    } catch (NoSuchAlgorithmException e) {
      throw new WxRuntimeException("当前Java环境不支持SHA256withRSA", e);
    } catch (SignatureException e) {
      throw new WxRuntimeException("签名计算失败", e);
    } catch (InvalidKeyException e) {
      throw new WxRuntimeException("无效的私钥", e);
    }
  }
}