Merge pull request #517 from nextcloud/feat/init-later

feat: Initialize cached values later

Author: susnux

lib/requesttoken.ts

@@ -1,18 +1,31 @@
 import { subscribe } from '@nextcloud/event-bus'
 
-const tokenElement = document.getElementsByTagName('head')[0]
-let token = tokenElement ? tokenElement.getAttribute('data-requesttoken') : null
-
 export interface CsrfTokenObserver {
 	(token: string): void;
 }
 
+let token: string | null | undefined = undefined
 const observers: CsrfTokenObserver[] = []
 
+/**
+ * Get current request token
+ *
+ * @return {string|null} Current request token or null if not set
+ */
 export function getRequestToken(): string | null {
+	if (token === undefined) {
+		// Only on first load, try to get token from document
+		const tokenElement = document?.getElementsByTagName('head')[0]
+		token = tokenElement ? tokenElement.getAttribute('data-requesttoken') : null
+	}
 	return token
 }
 
+/**
+ * Add an observer which is called when the CSRF token changes
+ *
+ * @param observer The observer 
+ */
 export function onRequestTokenUpdate(observer: CsrfTokenObserver): void {
 	observers.push(observer)
 }

lib/user.ts

@@ -1,14 +1,8 @@
 /// <reference types="@nextcloud/typings" />
 
-declare var OC: Nextcloud.v16.OC
-	| Nextcloud.v17.OC
-	| Nextcloud.v18.OC
-	| Nextcloud.v19.OC
-	| Nextcloud.v20.OC
-	| Nextcloud.v21.OC
-	| Nextcloud.v22.OC
-	| Nextcloud.v20.OC
-	| Nextcloud.v24.OC;
+declare var OC: Nextcloud.v23.OC
+	| Nextcloud.v24.OC
+	| Nextcloud.v25.OC;
 
 const getAttribute = (el: HTMLHeadElement | undefined, attribute: string): string | null => {
 	if (el) {
@@ -18,13 +12,7 @@ const getAttribute = (el: HTMLHeadElement | undefined, attribute: string): strin
 	return null
 }
 
-const head = document.getElementsByTagName('head')[0]
-const uid = getAttribute(head, 'data-user')
-const displayName = getAttribute(head, 'data-user-displayname')
-
-const isAdmin = (typeof OC === 'undefined')
-	? false
-	: OC.isUserAdmin()
+let currentUser: NextcloudUser | null | undefined = undefined
 
 export interface NextcloudUser {
 	uid: string,
@@ -33,13 +21,27 @@ export interface NextcloudUser {
 }
 
 export function getCurrentUser(): NextcloudUser | null {
-	if (uid === null) {
+	if (currentUser !== undefined) {
+		return currentUser
+	}
+
+	const head = document?.getElementsByTagName('head')[0]
+	if (!head) {
 		return null
 	}
 
-	return {
+	// No user logged in so cache and return null
+	const uid = getAttribute(head, 'data-user')
+	if (uid === null) {
+		currentUser = null
+		return currentUser
+	}
+
+	currentUser = {
 		uid,
-		displayName,
-		isAdmin,
+		displayName: getAttribute(head, 'data-user-displayname'),
+		isAdmin: (typeof OC === 'undefined') ? false : OC.isUserAdmin(),
 	} as NextcloudUser
+
+	return currentUser
 }

test/request-token.test.js

@@ -12,7 +12,7 @@ describe('request token', () => {
     })
 
     test('updates token via event', () => {
-        expect(getRequestToken()).toBe(undefined)
+        expect(getRequestToken()).toBe(null)
     })
 
     test('find correct value', () => {