mirror of
https://github.com/bulwarkmail/webmail.git
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60 lines
2.3 KiB
TypeScript
60 lines
2.3 KiB
TypeScript
/**
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* The app shell for offline mode (#523): tells the service worker
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* (public/sw.js) to keep this build's pages and files while any account
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* keeps mail on this device, and to drop them when none does.
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*/
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import { apiFetch, withBasePath } from '@/lib/browser-navigation';
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import { currentBuildId, SW_SCOPE } from '@/lib/app-update';
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/** The app's pages kept for a start without the network. */
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const SHELL_PAGES = ['/', '/mail', '/settings', '/protocol/mailto', '/protocol/webcal', '/popout/compose', '/popout/message/_'];
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/**
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* The files of this tab's build. After a deploy the server lists the new
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* build's files: nothing then, rather than another build's files under this
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* build's name.
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*/
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export async function shellFiles(): Promise<string[]> {
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try {
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const res = await apiFetch('/api/offline/shell', { cache: 'no-store' });
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if (!res.ok) return [];
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const data = (await res.json()) as { files?: unknown; buildId?: unknown };
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if (data.buildId !== currentBuildId()) return [];
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return Array.isArray(data.files) ? data.files.filter((f): f is string => typeof f === 'string') : [];
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} catch {
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return [];
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}
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}
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async function activeWorker(): Promise<ServiceWorker | null> {
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if (typeof navigator === 'undefined' || !('serviceWorker' in navigator)) return null;
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try {
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const registration = await navigator.serviceWorker.getRegistration(SW_SCOPE);
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return registration?.active ?? navigator.serviceWorker.controller ?? null;
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} catch {
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return null;
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}
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}
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export async function tellServiceWorker(on: boolean): Promise<void> {
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const worker = await activeWorker();
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if (!worker) return;
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const files = on ? await shellFiles() : [];
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// Without this build's files (a deploy happened), not its pages either:
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// they would be the new build's.
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const urls = on && files.length > 0 ? [...SHELL_PAGES.map((p) => withBasePath(p)), ...files] : [];
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worker.postMessage({ type: 'offline-shell', on, urls, buildId: currentBuildId() });
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}
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/** The service worker's copies of the shell, from the page (also when no worker runs). */
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export async function deleteShellCaches(): Promise<void> {
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if (typeof caches === 'undefined') return;
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try {
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const keys = await caches.keys();
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await Promise.all(keys.filter((key) => key.startsWith('bulwark-shell-')).map((key) => caches.delete(key)));
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} catch {
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/* no Cache API */
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}
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}
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