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jwt helper

Programmation Expliquer En WOLOF answered on August 18, 2022 Popularity 7/10 Helpfulness 5/10

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package com.javainuse.config;

import java.io.Serializable;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.function.Function;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.stereotype.Component;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;

@Component
public class JwtTokenUtil implements Serializable {

	private static final long serialVersionUID = -2550185165626007488L;

	public static final long JWT_TOKEN_VALIDITY = 5 * 60 * 60;

	@Value("${jwt.secret}")
	private String secret;

	//retrieve username from jwt token
	public String getUsernameFromToken(String token) {
		return getClaimFromToken(token, Claims::getSubject);
	}

	//retrieve expiration date from jwt token
	public Date getExpirationDateFromToken(String token) {
		return getClaimFromToken(token, Claims::getExpiration);
	}

	public <T> T getClaimFromToken(String token, Function<Claims, T> claimsResolver) {
		final Claims claims = getAllClaimsFromToken(token);
		return claimsResolver.apply(claims);
	}
    //for retrieveing any information from token we will need the secret key
	private Claims getAllClaimsFromToken(String token) {
		return Jwts.parser().setSigningKey(secret).parseClaimsJws(token).getBody();
	}

	//check if the token has expired
	private Boolean isTokenExpired(String token) {
		final Date expiration = getExpirationDateFromToken(token);
		return expiration.before(new Date());
	}

	//generate token for user
	public String generateToken(UserDetails userDetails) {
		Map<String, Object> claims = new HashMap<>();
		return doGenerateToken(claims, userDetails.getUsername());
	}

	//while creating the token -
	//1. Define  claims of the token, like Issuer, Expiration, Subject, and the ID
	//2. Sign the JWT using the HS512 algorithm and secret key.
	//3. According to JWS Compact Serialization(https://tools.ietf.org/html/draft-ietf-jose-json-web-signature-41#section-3.1)
	//   compaction of the JWT to a URL-safe string 
	private String doGenerateToken(Map<String, Object> claims, String subject) {

		return Jwts.builder().setClaims(claims).setSubject(subject).setIssuedAt(new Date(System.currentTimeMillis()))
				.setExpiration(new Date(System.currentTimeMillis() + JWT_TOKEN_VALIDITY * 1000))
				.signWith(SignatureAlgorithm.HS512, secret).compact();
	}

	//validate token
	public Boolean validateToken(String token, UserDetails userDetails) {
		final String username = getUsernameFromToken(token);
		return (username.equals(userDetails.getUsername()) && !isTokenExpired(token));
	}
}

Popularity 7/10 Helpfulness 5/10 Language whatever

Source: www.javainuse.com

Tags: helper jwt whatever

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Contributed on Aug 18 2022

Programmation Expliquer En WOLOF

0 Answers Avg Quality 2/10

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@Component
public class JwtAuthHelper {

	private final Key key;

	public JwtAuthHelper(@Value("${jwt.secret.key}") String secretKey) {
		key = Keys.hmacShaKeyFor(secretKey.getBytes(StandardCharsets.UTF_8));
	}

	public String generateJwtAuthToken(String subject, Map<String, Object> claims) {
		return Jwts.builder().setSubject(subject).addClaims(claims)
				.setExpiration(Date.from(Instant.now().plus(5, ChronoUnit.MINUTES))).signWith(key).compact();
	}

	public Map<String, Object> parseClaims(String token) {

		return Jwts.parserBuilder().setSigningKey(key).build().parseClaimsJws(token).getBody();

	}
}

Popularity 9/10 Helpfulness 1/10 Language whatever

Source: yuthads.blogspot.com

Tags: whatever helper

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Contributed on Aug 25 2022

GPLAY

0 Answers Avg Quality 2/10

jwt helper

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