spring security config v1

src/main/java/fr/eni/demo/bll/JwtService.java

@@ -0,0 +1,40 @@
+package fr.eni.demo.bll;
+
+import io.jsonwebtoken.JwtException;
+import io.jsonwebtoken.Jwts;
+import io.jsonwebtoken.SignatureAlgorithm;
+import io.jsonwebtoken.security.Keys;
+import org.springframework.stereotype.Service;
+
+import java.security.Key;
+import java.util.Date;
+
+@Service
+public class JwtService {
+
+    private static final long EXPIRATION_TIME = 86400000; // 1j
+    private final Key key = Keys.secretKeyFor(SignatureAlgorithm.HS256);
+
+    public String generateToken(String username) {
+        return Jwts.builder()
+                .setSubject(username)
+                .setIssuedAt(new Date())
+                .setExpiration(new Date(System.currentTimeMillis() + EXPIRATION_TIME))
+                .signWith(key)
+                .compact();
+    }
+
+    public String extractUsername(String token) {
+        return Jwts.parserBuilder().setSigningKey(key).build()
+                .parseClaimsJws(token).getBody().getSubject();
+    }
+
+    public boolean isTokenValid(String token) {
+        try {
+            Jwts.parserBuilder().setSigningKey(key).build().parseClaimsJws(token);
+            return true;
+        } catch (JwtException e) {
+            return false;
+        }
+    }
+}