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Linus Rath
e80f5ade81
Organisation > Devices now sets policy.json `organisation.devices`, each
switch off by default and scoped per domain or group:
- No downloads: attachments and files only preview (reader, conversation
view, Pro tab, list chips, .eml previews, the Files app). Download,
Download all, Open in new tab, Save to Files, drag-out, the browser's
PDF viewer (pdf.js instead) and media download controls go away.
- No export: no .eml export, View source, message drag-out, or folder and
account export; a running export stops and its file is deleted when
the switch turns on. Import stays.
- No printing: no Print buttons in mail, calendar and contacts; Ctrl+P
prints a note; the reader frame prints blank.
- No install prompt: no card, and the browser's own banner is held back.
- Watermark: the user's address and the date over the reader,
previews and every printout (mail, calendar, contacts, plugins).
A message follows its own account's policy; what isn't about one message
follows the strictest signed-in account. Every user path hides its
button, and the anchor and new-tab helpers refuse as a backstop
(lib/download-guard.ts), never the blob readers. The plugin APIs
`ui.downloadFile` and `ui.print` refuse too, and the office editor frame
loses `allow-downloads`.
Two assertions in components/mail/__tests__/blob-routing.test.tsx now
expect `{ kind: 'export' }` as the fifth argument of downloadBlob for an
.eml export: the export says what it is, so the backstop checks "No
export" rather than "No downloads" for it.
45 lines
2.0 KiB
TypeScript
45 lines
2.0 KiB
TypeScript
/**
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* Installed-app (PWA) display modes and what they break.
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*
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* In an installed web app, window.open(url, "_blank") is handed to the system
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* browser: a separate browsing context that cannot resolve the app's blob:
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* URLs, so the new window opens blank or errors (#865). Callers that would
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* open a blob: URL in a new window ask here first and show the file in-app
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* instead.
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*/
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import { downloadAllowedQuietly, type DownloadSubject } from "@/lib/download-guard";
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type StandaloneNavigator = Navigator & { standalone?: boolean };
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const APP_DISPLAY_MODES = ["standalone", "fullscreen", "window-controls-overlay"] as const;
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/** Whether the page runs as an installed app rather than in a browser tab. */
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export function isStandaloneDisplayMode(): boolean {
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if (typeof window === "undefined") return false;
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// iOS Safari home-screen apps report navigator.standalone and (on older
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// versions) no display-mode media feature at all.
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if ((window.navigator as StandaloneNavigator).standalone === true) return true;
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if (typeof window.matchMedia !== "function") return false;
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return APP_DISPLAY_MODES.some((mode) => window.matchMedia(`(display-mode: ${mode})`).matches);
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}
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/** Whether a new window could load this URL. Only blob: URLs in an installed app cannot. */
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export function canOpenUrlInNewWindow(url: string): boolean {
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return !url.startsWith("blob:") || !isStandaloneDisplayMode();
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}
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/**
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* Opens a preview URL in a new window when that window can load it. Returns
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* false without opening anything when it cannot, so the caller shows the
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* file in-app (or downloads it) instead of leaving the user a dead window.
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*/
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export function openPreviewInNewWindow(url: string, subject?: DownloadSubject): boolean {
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if (!canOpenUrlInNewWindow(url)) return false;
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// A file in a tab of its own can be saved from there: the same device
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// policy as a download. Refused, the caller previews it in the app.
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if (!downloadAllowedQuietly('attachment', subject)) return false;
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window.open(url, "_blank", "noopener,noreferrer");
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return true;
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}
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