feat(security): creado componente JwtTokenProvider para generación, validación y…

feat(security): creado componente JwtTokenProvider para generación, validación y autenticación del token

src/main/java/com/example/apprecetas/security/jwt/JwtTokenProvider.java

+package com.example.apprecetas.security.jwt;
+
+import io.jsonwebtoken.Jwts;
+import io.jsonwebtoken.SignatureAlgorithm;
+import io.jsonwebtoken.security.Keys;
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.core.Authentication;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.stereotype.Component;
+
+import javax.crypto.SecretKey;
+import java.time.Instant;
+import java.time.temporal.ChronoUnit;
+import java.util.Date;
+
+@Component
+@RequiredArgsConstructor
+public class JwtTokenProvider {
+
+    private final UserDetailsService userDetailsService;
+
+    private final SecretKey secretKey = Keys.secretKeyFor(SignatureAlgorithm.HS256);
+
+    public String generateToken(String username) {
+        long jwtExpirationMs = 3600000; // 1 hora en milisegundos
+        return Jwts.builder()
+                .subject(username)
+                .issuedAt(new Date())
+                .expiration(Date.from(Instant.now().plus(jwtExpirationMs, ChronoUnit.MILLIS)))
+                .signWith(secretKey)
+                .compact();
+    }
+
+    public boolean validateToken(String token) {
+        try {
+            Jwts.parser().verifyWith(secretKey).build().parseSignedClaims(token);
+            return true;
+        } catch (Exception e) {
+            return false;
+        }
+    }
+
+    public String getUsernameFromToken(String token) {
+        return Jwts.parser()
+                .verifyWith(secretKey)
+                .build()
+                .parseSignedClaims(token)
+                .getPayload()
+                .getSubject();
+    }
+
+    public Authentication getAuthentication(String token) {
+        String username = getUsernameFromToken(token);
+        UserDetails userDetails = userDetailsService.loadUserByUsername(username);
+        return new UsernamePasswordAuthenticationToken(userDetails, null, userDetails.getAuthorities());
+    }
+
+}