NAT-402/integrate GUI with our custom OPA server

src/utils/policy.ts

+import { loadPolicy } from "@open-policy-agent/opa-wasm";
+
+
 export async function createPolicyCheck(user?: Partial<Oidc.Profile>) {
     if (!user) {
         return () => true;
     }
+
+    const opaBundletUrl = process.env.REACT_APP_OPA_BUNDLE_URL;
+
+    if (typeof opaBundletUrl === 'undefined') {
+        throw new Error('REACT_APP_OPA_BUNDLE_URL is not defined');
+    }
+
+    const policyResult = await fetch(opaBundletUrl);
+    const policyWasm = await policyResult.arrayBuffer();
     try {
+        const policy = await loadPolicy(policyWasm);
+
         function allowed(resource: string): boolean {
-            return true;
+            const input: any = {
+                resource: resource,
+                method: "GET",
+                ...user,
+            };
+
+            const resultSet = policy.evaluate(input);
+
+            if (resultSet == null || resultSet.length === 0) {
+                console.error("evaluation error", resultSet);
+                return false;
+            }
+
+            return resultSet[0].result;
         }
         return allowed;
     } catch {