jwtauthentication.java

package openin.assignment.config;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import java.util.Date;

@Component
public class jwtTokenprovider {

	
	@Value("${app.jwtSecret}")
    private String jwtSecret;

    @Value("${app.jwtExpirationInMs}")
    private int jwtExpirationInMs;

    public String generateToken(Long userId) {
        Date now = new Date();
        Date expiryDate = new Date(now.getTime() + jwtExpirationInMs);

        return jwts.builder()
                .setSubject(Long.toString(userId))
                .setIssuedAt(now)
                .setExpiration(expiryDate)
                .signWith(SignatureAlgorithm.HS512, jwtSecret)
                .compact();
    }

    public Long getUserIdFromToken(String token) {
        Claims claims = jwts.parser()
                .setSigningKey(jwtSecret)
                .parseClaimsJws(token)
                .getBody();

        return Long.parseLong(claims.getSubject());
    }

    public boolean validateToken(String authToken) {
        try {
            jwts.parser().setSigningKey(jwtSecret).parseClaimsJws(authToken);
            return true;
        } catch (Exception ex) {
            return false;
        }
    }
	
	
}