D-Net

package eu.dnetlib.openaire.rest.security;

import javax.xml.bind.DatatypeConverter;

import io.jsonwebtoken.*;

import java.io.UnsupportedEncodingException;

import java.util.Date;

/**

 * Created by kiatrop on 10/4/2017.

 */

public class JWTValidator {

    public static boolean isValid(String token) {

        //String subject = "my-very-secret";

        try {

            //This line will throw an exception if it is not a signed JWS (as expected)

            Claims claims = Jwts.parser()

                .setSigningKey(DatatypeConverter.parseBase64Binary("my-very-secret"))

                .parseClaimsJws(token).getBody();

            System.out.println("Id: " + claims.get("userId"));

            System.out.println("Subject: " + claims.getSubject());

            System.out.println("Fullname: " + claims.get("fullname"));

            System.out.println("Email: " + claims.get("email"));

            System.out.println("Role: " + claims.get("role"));

            System.out.println("Expiration: " + claims.getExpiration());

            Jws jwtClaims = Jwts.parser().setSigningKey("my-very-secret").parseClaimsJws(token);

            return true;

        } catch (SignatureException e) {

            System.out.println("Either calculating a signature or verifying an existing signature of a JWT failed");

            return false;

        } catch(PrematureJwtException e) {

            System.out.println("A JWT was accepted before it is allowed to be accessed and must be rejected");

            return false;

        } catch(ClaimJwtException e){

            System.out.println("After a validation of a JWT claim failed");

            return false;

        } catch(MalformedJwtException e){

            System.out.println("A JWT was not correctly constructed and should be rejected");

            return false;

        } catch(UnsupportedJwtException e){

            System.out.println("Receiving a JWT in a particular format/configuration that does not match the format expected by the application");

            return false;

        }

    }

    public static void main(String[] args) {

        // valid (isValid("eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJBcmdpcm8iLCJmdWxsbmFtZSI6IkFyZ2lybyBLb2tvZ2lhbmFraSIsInVzZXJJZCI6IjgiLCJlbWFpbCI6ImFyZ2lyb0BnbWFpbC5jb20iLCJyb2xlIjoyLCJleHAiOjE0OTIwMDEyMzN9.u2xTTyjF6_n60yiz-Pfj72TQIaVNRgxt7Qe8w_AxoTBulKuiq6ldzZHDvgcef2jsA12TFRgfIyfXhsTj-04P5A"))

        // not valid "eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJBcmdpcm8iLCJmdWxsbmFtZSI6IkFyZ2lybyBLb2tvZ2lhbmFraSIsInVzZXJJZCI6IjgiLCJlbWFpbCI6ImFyZ2lyb0BnbWFpbC5jb20iLCJyb2xlIjoyLCJleHAiOjE0OTE5ODk2Njh9.JUiFGEverBVbo3eXlV2nX265cwNTYH1EJGZT0IcGyY31WUDHiGmtnTY-NwZsy0R93irVhAzVhTlmZI_DSRQ"

        if (isValid("eyJhbGciOiJIUzUxMiJ9.eyJzdWIiOiJBcmdpcm8iLCJmdWxsbmFtZSI6IkFyZ2lybyBLb2tvZ2lhbmFraSIsInVzZXJJZCI6IjgiLCJlbWFpbCI6ImFyZ2lyb0BnbWFpbC5jb20iLCJyb2xlIjoyLCJleHAiOjE0OTIwMDc4ODl9.xGad45dRe_lwOJYuD_zZXHYWqeOQkXuRFWdBbkGDK2bMGRDdkcfLoEpUopm9OB2GVgkJHmFp0tbMkBSPSTBwhw"))

            System.out.println("Valid");

        else

            System.out.println("Not Valid");

    }

}