Fix OIDC callback query params

- Value of namespace was getting stripped from the state query param
- Used native URL search param api to fetch the values

ui/app/routes/vault/cluster/oidc-callback.js

@@ -6,7 +6,18 @@ export default Route.extend({
     // left blank so we render the template immediately
   },
   afterModel() {
-    let { auth_path: path, code, state } = this.paramsFor(this.routeName);
+    let queryString = window.location.search;
+    // Check if url is encoded
+    if (this.containsEncodedComponents(queryString)) {
+      queryString = decodeURIComponent(queryString);
+    }
+    // Since state param can also contain namespace, fetch the values using native url api.
+    // For instance, state params value can be state=st_123456,ns=d4fq
+    // Ember paramsFor used to strip out the value after the "=" sign. In short ns value was not being passed along.
+    let urlParams = new URLSearchParams(queryString);
+    let state = urlParams.get('state'),
+      code = urlParams.get('code');
+    let { auth_path: path } = this.paramsFor(this.routeName);
     let { namespaceQueryParam: namespace } = this.paramsFor('vault.cluster');
     path = window.decodeURIComponent(path);
     const source = 'oidc-callback'; // required by event listener in auth-jwt component
@@ -17,4 +28,8 @@ export default Route.extend({
     this._super(...arguments);
     controller.set('pageContainer', document.querySelector('.page-container'));
   },
+  // Helper function to check if url is encoded
+  containsEncodedComponents(x) {
+    return decodeURI(x) !== decodeURIComponent(x);
+  },
 });