feat: Refactored Token Refresh

src/main/java/org/decepticons/linkshortener/api/security/jwt/JwtTokenUtil.java

@@ -11,6 +11,7 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.function.Function;
+import org.decepticons.linkshortener.api.exception.InvalidTokenException;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.security.core.userdetails.UserDetails;
 import org.springframework.stereotype.Component;
@@ -92,7 +93,7 @@ public boolean validateToken(
       final String username = extractUsername(token);
       return (username.equals(userDetails.getUsername())
           && !isTokenExpired(token));
-    } catch (JwtException | IllegalArgumentException e) {
+    } catch (InvalidTokenException e) {
       return false;
     }
   }
@@ -162,13 +163,17 @@ private String createToken(
    * @param token the JWT token
    * @return the claims
    */
-
   private Claims extractAllClaims(final String token) {
-    return Jwts.parserBuilder()
-        .setSigningKey(signingKey)
-        .build()
-        .parseClaimsJws(token)
-        .getBody();
+    try {
+      return Jwts.parserBuilder()
+              .setSigningKey(signingKey)
+              .build()
+              .parseClaimsJws(token)
+              .getBody();
+    } catch (JwtException | IllegalArgumentException ex) {
+      throw new InvalidTokenException(
+              "Invalid token provided during claims extraction.", ex);
+    }
   }
 
   /**

src/main/java/org/decepticons/linkshortener/api/v1/controller/unversioned/GlobalExceptionHandlerController.java

@@ -224,5 +224,25 @@ public ResponseEntity<Map<String, Object>> handleShortLinkOutOfDate(
     );
   }
 
+  /**
+   * Handles exceptions for bad login credentials.
+   *
+   * @param ex The BadCredentialsException instance.
+   * @return A ResponseEntity with an UNAUTHORIZED status.
+   */
+  @ExceptionHandler(
+          org.springframework.security.authentication
+                  .BadCredentialsException.class
+  )
+  public ResponseEntity<Map<String, Object>> handleBadCredentials(
+          final org.springframework.security.authentication
+                  .BadCredentialsException ex
+  ) {
+    return buildErrorResponseSecurity(
+            HttpStatus.UNAUTHORIZED,
+            "Invalid Credentials",
+            ex.getMessage());
+  }
+
 
 }