feat(widget): add restriction callback to restrict visibility and modification of widget kinds (#2658)

* feat(widget): add restriction callback to restrict visibility and modification of widget kinds

* fix: typecheck issue

* chore: address pull request feedback

packages/auth/permissions/index.ts

@@ -1,2 +1,3 @@
 export * from "./board-permissions";
 export * from "./integration-permissions";
+export * from "./widget-restriction";

packages/auth/permissions/widget-restriction.ts

@@ -0,0 +1,14 @@
+import type { Session } from "next-auth";
+
+import type { WidgetDefinition } from "../../widgets/src";
+import type { RestrictionLevel } from "../../widgets/src/definition";
+
+export const isWidgetRestricted = <TDefinition extends WidgetDefinition>(props: {
+  definition: TDefinition;
+  user: Session["user"] | null;
+  check: (level: RestrictionLevel) => boolean;
+}) => {
+  if (!("restrict" in props.definition)) return false;
+  if (props.definition.restrict === undefined) return false;
+  return props.check(props.definition.restrict({ user: props.user ?? null }));
+};