amk.sdk.deeplink.presenter.JwtTokenConfigPresenter Maven / Gradle / Ivy

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The AMK Deeplink SDK is a library for AMK's merchant that allow them to be able generate deeplink for their user to pay via AMK Bank app.

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package amk.sdk.deeplink.presenter;

import amk.sdk.deeplink.entity.model.AMKDLErrorCode;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;

import java.io.File;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.*;
import java.security.spec.EncodedKeySpec;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.Base64;
import java.util.Date;

import static amk.sdk.deeplink.exception.DeeplinkException.throwCustomerException;

public class JwtTokenConfigPresenter {

    private static final long JWT_TOKEN_VALIDITY = 300000;

    public static String generateJwtToken(String clientId, String privateKeyPath, String jwtAudience) throws Exception {
        long nowMillis = System.currentTimeMillis();
        Date now = new Date(nowMillis);
        long expired = nowMillis + JWT_TOKEN_VALIDITY;
        Date exp = new Date(expired);
        return Jwts.builder()
                .setIssuer(clientId)
                .setAudience(jwtAudience)
                .setIssuedAt(now)
                .setExpiration(exp)
                // RS256 with privateKey
                .signWith(SignatureAlgorithm.RS256, getPrivateKey(privateKeyPath))
                .compact();

    }

    private static PrivateKey getPrivateKey(String fileName) throws Exception {

        File file = new File(fileName);
        if (!file.exists()) throwCustomerException(AMKDLErrorCode.FILE_NOT_EXIST);

        String privateKeyString = new String(Files.readAllBytes(Paths.get(fileName)));
        String replacePrivateKeyString = privateKeyString
                .replaceAll(System.lineSeparator(), "")
                .replace("-----BEGIN RSA PRIVATE KEY-----", "")
                .replace("-----END RSA PRIVATE KEY-----", "")
                .replace("-----BEGIN PRIVATE KEY-----", "")
                .replace("-----END PRIVATE KEY-----", "");
        KeyFactory fact = KeyFactory.getInstance("RSA");
        byte[] bytes = Base64.getDecoder().decode(replacePrivateKeyString.getBytes(StandardCharsets.UTF_8));
        EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(bytes);
        return fact.generatePrivate(keySpec);
    }
}