setup should run only once for a request

to avoid duplicate headers

Author: geoffreyfourmis

src/main/java/dev/sultanov/keycloak/multitenancy/resource/AbstractAdminResource.java

@@ -43,10 +43,9 @@ public abstract class AbstractAdminResource<T extends AdminAuth> {
     public AbstractAdminResource(KeycloakSession session) {
         this.session = session;
         this.realm = session.getContext().getRealm();
-        setup();
     }
 
-    private void setup() {
+    public final void setup() {
         setupAuth();
         setupEvents();
         setupProvider();

src/main/java/dev/sultanov/keycloak/multitenancy/resource/TenantsResourceProvider.java

@@ -18,7 +18,9 @@ public Object getResource() {
         if (request != null && "OPTIONS".equals(request.getHttpMethod())) {
             return new CorsResource(request);
         } else {
-            return new TenantsResource(session);
+            TenantsResource resource = new TenantsResource(session);
+            resource.setup();
+            return resource;
         }
     }