add context.tsx

packages/app/src/stores/context.tsx

@@ -0,0 +1,26 @@
+import { SWRResponse } from 'swr';
+import { pagePathUtils } from '@growi/core';
+
+import { IUser } from '../interfaces/user';
+
+import { useStaticSWR } from './use-static-swr';
+
+export const useCurrentUser = (currentUser?: IUser): SWRResponse<IUser, Error> => {
+  return useStaticSWR('currentUser', currentUser || null);
+};
+
+export const useCurrentPagePath = (currentPagePath?: string): SWRResponse<string, Error> => {
+  return useStaticSWR('currentPagePath', currentPagePath || null);
+};
+
+export const useIsSharedUser = (): SWRResponse<boolean, Error> => {
+  const { data: currentUser } = useCurrentUser();
+  const { data: currentPagePath } = useCurrentPagePath();
+
+  const isLoading = currentUser === undefined || currentPagePath === undefined;
+
+  const key = isLoading ? null : 'isSharedUser';
+  const value = !isLoading && currentUser == null && pagePathUtils.isSharedPage(currentPagePath);
+
+  return useStaticSWR(key, value);
+};