fixup! Add JWTAuthorizer Implementation.

Author: G8XSU

java/app/src/main/java/org/vss/auth/JwtAuthorizer.java

@@ -19,6 +19,8 @@ public class JwtAuthorizer implements Authorizer {
 	private final PublicKey publicKey;
 	private final JWTVerifier verifier;
 
+	public static final String BEARER_PREFIX = "Bearer ";
+
 	public JwtAuthorizer(String pemFormatPublicKey) throws Exception {
 		this.publicKey = loadPublicKey(pemFormatPublicKey);
 
@@ -31,12 +33,12 @@ public AuthResponse verify(HttpHeaders headers) throws AuthException {
 
 		try {
 			String authorizationHeader = headers.getHeaderString(HttpHeaders.AUTHORIZATION);
-			if (authorizationHeader == null || !authorizationHeader.startsWith("Bearer ")) {
+			if (authorizationHeader == null || !authorizationHeader.startsWith(BEARER_PREFIX)) {
 				throw new AuthException("Missing or invalid Authorization header.");
 			}
 
-			// Extract token by excluding 'Bearer '.
-			String token = authorizationHeader.substring(7);
+			// Extract token by excluding BEARER_PREFIX.
+			String token = authorizationHeader.substring(BEARER_PREFIX.length());
 
 			DecodedJWT jwt = verifier.verify(token);