add admin user logic

src/main/java/ru/soune/nocopy/adminpanel/util/JwtUtil.java

@@ -0,0 +1,64 @@
+package ru.soune.nocopy.adminpanel.util;
+
+import io.jsonwebtoken.Claims;
+import io.jsonwebtoken.Jwts;
+import io.jsonwebtoken.SignatureAlgorithm;
+import io.jsonwebtoken.security.Keys;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+
+import javax.crypto.SecretKey;
+import java.nio.charset.StandardCharsets;
+import java.util.Date;
+
+@Component
+public class JwtUtil {
+
+    @Value("${jwt.secret:Z29nb3Bvd2VycmFuZ2VydHVtYmF5YW1iZjMyNDIyMjh3aW5lcndpbmVy}")
+    private String secret;
+
+    @Value("${jwt.expiration:3600000}")
+    private Long expiration;
+
+    private SecretKey getSigningKey() {
+        return Keys.hmacShaKeyFor(secret.getBytes(StandardCharsets.UTF_8));
+    }
+
+    public String generateToken(String email, Long userId) {
+        return Jwts.builder()
+                .setSubject(email)
+                .claim("userId", userId)
+                .setIssuedAt(new Date())
+                .setExpiration(new Date(System.currentTimeMillis() + expiration))
+                .signWith(getSigningKey(), SignatureAlgorithm.HS256)
+                .compact();
+    }
+
+    public Claims extractClaims(String token) {
+        return Jwts.parser()
+                .setSigningKey(getSigningKey())
+                .build()
+                .parseClaimsJws(token)
+                .getBody();
+    }
+
+    public String extractEmail(String token) {
+        return extractClaims(token).getSubject();
+    }
+
+    public Long extractUserId(String token) {
+        return extractClaims(token).get("userId", Long.class);
+    }
+
+    public boolean isTokenExpired(String token) {
+        return extractClaims(token).getExpiration().before(new Date());
+    }
+
+    public boolean validateToken(String token) {
+        try {
+            return !isTokenExpired(token);
+        } catch (Exception e) {
+            return false;
+        }
+    }
+}