Every plugin iframe loaded /plugin-sandbox, a force-dynamic Next page.
Each frame then fetched, parsed and hydrated Next's client router on top
of React and the runtime, and the server rendered the page once per
frame, one after another when a dozen plugins started together.
Sandboxed frames have opaque origins, so the browser's code cache never
helps, and they run on the host page's main thread: with 12 plugins
the frames took 2.5-3 s to come up after the app had loaded.
The sandbox routes now return a small HTML page with the UI kit's
stylesheet and the runtime as an ES module, both built ahead of time:
- `scripts/build-plugin-sandbox.mjs` bundles the runtime with esbuild
and compiles `plugin-kit.css` with the app's Tailwind setup into
`public/plugin-sandbox-assets/`, with a manifest. Named Tabler imports
are pointed at the icons' own files, so the full icon set stays in a
chunk that only loads for an icon name the kit doesn't ship.
- `npm run build`, `npm run dev`, the Dockerfile and the perf-guard
workflow run it before `next build`.
- `lib/plugin-sandbox/sandbox-document.ts` writes the page; proxy.ts
still sets the sandbox CSP and the script carries its nonce.
- The assets are served from public/ with CORS and immutable caching.
A frame on an idle page is ready in 255 ms instead of 362 ms, eleven at
once in 1.0 s instead of 2.1 s.
The inline sidebar apps hand their origins to the proxy through a
client-written cookie, which the proxy merges into `frame-src`. Any
same-site sibling host could set that cookie too. Over HTTPS the cookie
is now `__Host-bulwark_app_frame_origins`, which only this exact host
can set, and the proxy ignores the unprefixed name there. Plain HTTP
(local development) keeps the old name.
Paths the proxy skips (static files, `/_next`, `/api`) got no security
headers at all, so the not-found shell rendered for a missing
`/foo.html`, `/branding/x` or an unknown `/api` route could be framed
by any site. Skipped responses now carry `nosniff` and
`X-Frame-Options: DENY`, and non-API ones `frame-ancestors 'none'`;
API routes keep setting their own CSP.
The origin gate in the proxy only covered `/api/auth/*`. The JMAP
passthrough, `/api/settings`, `/api/wopi/launch`,
`/api/plugin-approval-status`, `/api/fetch-ical`, `/api/translate`,
`/api/caldav/discover`, `/api/calendar-agenda` and `/api/webdav` all act
with the session cookie and had no origin check. A page on a same-site
sibling origin receives SameSite=Lax cookies, so it could run arbitrary
JMAP as the signed-in user, including sharing mailboxes to a third
account.
The proxy now gates every `/api/` route except the WOPI file endpoints
the office editor calls server-to-server, and each of these handlers
checks again. The proxy also decides on the decoded path, so an escaped
spelling such as `/api/%61uth/session` no longer skips the gate.
The page CSP set font-src 'self', which blocked fonts referenced by
rendered email CSS (brand webfonts loaded over https). Allow https:/data:
for font-src. Email bodies render inside the sandboxed iframe, which keeps
its own stricter blocking-mode font-src for privacy.
The root (main)/layout renders <html> ABOVE the [locale] segment, so next-intl's
getLocale() returns the default locale there - emitting <html lang="en"> on every
page regardless of UI language (e.g. /de) and a hardcoded English <head>
description. Both are strong "translate this page" triggers in Chrome.
proxy.ts already exposes the nonce to server components via the
x-middleware-request-* mechanism; expose the request pathname the same way as
x-pathname, and have the root layout derive the locale from it (falling back to
getLocale() when the path has no locale segment) for both <html lang> and the
localized meta_description (new key in all 17 locales; the English value is
unchanged).
* Added account selection for protocol links when multiple connected accounts are available, including mailto: links
* Added support for handling mailto: links in an already-open PWA/session instead of always opening a new tab
* Added webcal: protocol handling for calendar links
* Added account selection for webcal: links when multiple calendar-capable accounts are connected
* Added an import-or-subscribe choice for detected webcal calendars
* Added protocol handler settings for registering mail and calendar handlers and choosing the open mode
* Added service worker/session coordination for passing protocol requests between browser/PWA contexts
* Added tests and translations for the new protocol handler flows
When localePrefix is 'always' (or 'as-needed' with a non-default locale),
paths like /en/settings already have the locale in the URL. Running them
through the next-intl middleware a second time can trigger rewrite loops,
especially when combined with a proxy basePath where the middleware's
detection of the 'current' path conflicts with the rewritten one.
Skip the intl middleware in this case — the path is already in the
canonical locale-prefixed form and no further rewriting is needed.
This makes NEXT_PUBLIC_LOCALE_PREFIX=always reliable for sub-path
deployments.
Linus Rath
Linus Rath
Kuan-Chieh Huang
Shuki Vaknin
dealerweb
Lucas Gaitzsch
Denis Teyssier
shuki