Source Code jwt service service for spring boot (1 Viewer)

[bilal boudad]

package com.JVJ_pj.user.security;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.io.Decoders;
import io.jsonwebtoken.security.Keys;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.stereotype.Service;

import java.security.Key;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import java.util.function.Function;

@Service

public class JwtService {
    @Value("${application.security.jwt.expiration}")
    private long jwtExpiration ;

    @Value("${application.security.jwt.secret-key}")
    private String secretKey ;


    public String extractUsername(String token) {
        return  extractClaim(token, Claims::getSubject);
    }
  public  <T> T extractClaim(String token, Function<Claims,T> claimResolver){
   final Claims claims = extractAllClaims(token);
   return  claimResolver.apply(claims);
  }

    private Claims extractAllClaims(String token) {
        return Jwts
                .parserBuilder()
                .setSigningKey(getSignInKey())
                .build()
                .parseClaimsJws(token)
                .getBody()
                ;

    }

    public String generateToken(UserDetails userDetails){
        return generateToken(new HashMap<>(),userDetails);
    }

    public String generateToken(Map <String, Object> claims, UserDetails userDetails) {

        return buildToken(claims,userDetails,jwtExpiration);
    }

    private String buildToken(Map<String, Object> extractclaims, UserDetails userDetails, long jwtExpiration) {
        var authorities = userDetails.getAuthorities()
                .stream()
                .map(GrantedAuthority::getAuthority)
                .toList();
        return Jwts
                .builder()
                .setClaims(extractclaims)
                .setSubject(userDetails.getUsername())
                .setIssuedAt(new Date(System.currentTimeMillis()))
                .setExpiration(new Date(System.currentTimeMillis() + jwtExpiration))
                .claim("authorities",authorities)
                .signWith(getSignInKey())
                .compact()
                ;

    }
    public boolean isTokenValid(String token, UserDetails userDetails){
        final String username=extractUsername(token);
        return  (username.equals(userDetails.getUsername()))&& !isTokenExpired(token);
    }

    private boolean isTokenExpired(String token) {
        return extractExpiration(token).before(new Date());
    }

    private Date extractExpiration(String token) {
        return  extractClaim(token,Claims::getExpiration);
    }


    private Key getSignInKey() {
        byte[] KeyBytes = Decoders.BASE64.decode(secretKey);
        return Keys.hmacShaKeyFor(KeyBytes);
    }
}

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[bilal boudad]

io.jsonwebtoken.Claims