pzampino commented on code in PR #562:
URL: https://github.com/apache/knox/pull/562#discussion_r855557121


##########
gateway-service-knoxtoken/src/main/java/org/apache/knox/gateway/service/knoxtoken/TokenResource.java:
##########
@@ -804,8 +804,11 @@ private Response getAuthenticationToken() {
         if (endpointPublicCert != null) {
           map.put(ENDPOINT_PUBLIC_CERT, endpointPublicCert);
         }
+
         final String passcode = UUID.randomUUID().toString();
-        map.put(PASSCODE, generatePasscodeField(tokenId, passcode));
+        if (tokenStateService != null && 
!tokenStateService.storeTokensInMemoryOnly()) {

Review Comment:
   This is where you could employ tokenStateService instanceof 
PersistentTokenStateService



##########
gateway-provider-security-jwt/src/test/java/org/apache/knox/gateway/provider/federation/TokenIDAsHTTPBasicCredsFederationFilterTest.java:
##########
@@ -372,6 +372,11 @@ public void start() throws ServiceLifecycleException {
         public void stop() throws ServiceLifecycleException {
         }
 
+        @Override
+        public boolean storeTokensInMemoryOnly() {

Review Comment:
   Rather than adding this method to all the implementations, I tend to think 
of these things in terms of  interfaces (e.g., PersistentTokenStateService).
   Then, the referencing code can check (tokenStateService instanceof 
PersistentTokenStore).
   Perhaps, the persistent implementations could extend an abstract 
PersistentTokenStateService class, which itself extends 
DefaultTokenStateService.



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