Fix accessible namespaces functionality under restrictive RBAC (#2138)

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

src/main/cluster.ts

@@ -399,6 +399,8 @@ export class Cluster implements ClusterModel, ClusterState {
     this.accessible = false;
     this.ready = false;
     this.activated = false;
+    this.allowedNamespaces = [];
+    this.accessibleNamespaces = [];
     this.resourceAccessStatuses.clear();
     this.pushState();
   }

src/renderer/components/context.ts

@@ -14,7 +14,22 @@ export const clusterContext: ClusterContext = {
   },
 
   get allNamespaces(): string[] {
-    return this.cluster?.allowedNamespaces ?? [];
+    if (!this.cluster) {
+      return [];
+    }
+
+    // user given list of namespaces
+    if (this.cluster?.accessibleNamespaces.length) {
+      return this.cluster.accessibleNamespaces;
+    }
+
+    if (namespaceStore.items.length > 0) {
+      // namespaces from kubernetes api
+      return namespaceStore.items.map((namespace) => namespace.getName());
+    } else {
+      // fallback to cluster resolved namespaces because we could not load list
+      return this.cluster.allowedNamespaces || [];
+    }
   },
 
   get contextNamespaces(): string[] {