When an email contains a calendar invitation, the raw .ics MIME parts
(text/calendar, application/ics, application/icalendar) were showing
up in the attachment list alongside the calendar invitation banner,
which is confusing — the banner already provides the relevant UI.
Filter those MIME types out of the displayed attachment list whenever
the calendar invitation banner is active, reusing the existing
isCalendarMimeType utility from lib/calendar-invitation.ts.
Three issues addressed in sendImipReply, sendImipInvitation and
sendImipCancellation:
1. Line folding (RFC 5545 §3.1)
Add foldIcsLine() helper that wraps iCalendar content lines at
74 characters, inserting CRLF + SPACE as required by the spec.
Previously, long lines (e.g. ATTENDEE with a full CN and mailto
URI) could exceed the 75-octet limit and cause strict parsers to
silently reject the ICS.
2. MIME wrapper type (RFC 6047 §3 + CalConnect iMIP Best Practices)
Change bodyStructure from multipart/alternative to multipart/mixed.
The CalConnect interoperability guide recommends multipart/mixed as
the outer wrapper for messages carrying a text/calendar part; many
clients skip iTIP processing when they see multipart/alternative.
3. Calendar part metadata
Add charset=UTF-8 to the text/calendar Content-Type, disposition
inline, and a descriptive filename (reply.ics / invite.ics /
cancel.ics) to each outgoing calendar MIME part.
Note: Gmail-to-Gmail events are handled by Google's internal scheduling
API and cannot be updated via iMIP regardless of MIME structure. This
fix improves interoperability with Outlook, Thunderbird, Fastmail and
standard CalDAV servers.
Previously isCalendarMimeType was a module-private function in
lib/calendar-invitation.ts. Exporting it allows the email viewer
to reuse the same MIME type detection logic when filtering out
calendar attachments, avoiding duplication of the type set.
Reorganize the Branding section with subsections (App identity, Icons &
favicon, PWA appearance, Logos, Login page) and document the new variables
APP_SHORT_NAME, APP_DESCRIPTION, PWA_ICON_URL, PWA_THEME_COLOR and
PWA_BACKGROUND_COLOR.
- Add app/manifest.ts to serve /manifest.webmanifest dynamically at runtime
- Name, short_name, description, theme_color and background_color are read
from env vars (APP_NAME, APP_SHORT_NAME, APP_DESCRIPTION, PWA_THEME_COLOR,
PWA_BACKGROUND_COLOR) with Bulwark defaults as fallback
- Add /api/pwa-icon/[size] route that auto-generates 192x192 and 512x512 PNG
icons from PWA_ICON_URL (or FAVICON_URL as fallback) using Sharp; results
are cached in memory
- Remove static manifest: '/manifest.json' from layout metadata; Next.js
injects the link automatically from app/manifest.ts
- Fix pre-existing ESLint no-undef on RequestInit in browser-navigation.ts
