Wimsy

Wimsy is a cross-platform XMPP client built with Flutter.

It's early days. This was built almost entirely by Codex.

Platforms

Vaguely tested on:

• Linux
• Windows
• Android
• Web

Builds, but untested on:

• iOS
• macOS

Features

• Direct TLS (XEP-0368) and StartTLS with SRV discovery
• Stream Management (XEP-0198) with resumable sessions and ack handling
• MAM history sync and paging (XEP-0313 + XEP-0059)
• MUC join/leave + bookmarks (XEP-0045 + XEP-0048/Bookmarks 2)
• Audio/video calling over WebRTC (Jingle XEP-0166/0167 + JMI XEP-0353)
• MUJI group calls (XEP-0272)
• Chat states, receipts, and chat markers (XEP-0085, XEP-0184, XEP-0333)
• Message carbons (XEP-0280)
• Message corrections (XEP-0308)
• Message reactions (XEP-0444)
• Roster versioning (XEP-0237)
• Client State Indication (XEP-0352)
• PEP avatars (XEP-0084) with +notify; vcard-temp fallback (XEP-0054)
• Message Displayed Sync (XEP-0490) for unread tracking and notifications
• Blocking via privacy lists (XEP-0016)
• File transfer via HTTP Upload (XEP-0363) and IBB (XEP-0047)
• XEP-0066 OOB image rendering (partial)
• Presence state + custom status message
• Native notifications for incoming messages (desktop + Android)
• Console protocol traces for send/receive (when enabled)

Notes

• xmpp_stone is vendored locally in vendor/xmpp_stone to enforce StartTLS and surface XML traffic during debugging.
• macOS builds that use flutter_secure_storage require the keychain-access-groups entitlement (not com.apple.security.keychain-access-groups) to avoid -34018.

Linux build dependencies

The WebXDC webview uses WPE WebKit. On Ubuntu 26.04, configure the WPE APT repository used in .github/workflows/ci.yml (or build packages with linux/build-wpewebkit.sh), then install the development dependencies:

sudo apt-get install libwpewebkit-1.0-dev libwpe-1.0-dev libwpebackend-fdo-1.0-dev libsoup-3.0-dev
pkg-config --print-errors --cflags --libs wpe-webkit-2.0 wpe-1.0 wpebackend-fdo-1.0
flutter build linux --release

pkg-config --list-all and --modversion can report WPE WebKit even when dependencies listed in its Requires field are missing. Use the flags check above to expose missing development packages behind CMake's "WPE WebKit development files were not found" error. Older locally built WebKit development packages do not declare all these dependencies, so install them explicitly.

Android test login links

Android builds accept login links in either of these forms:

wimsy://login?jid=user%40example.com&password=test123&display_name=Test%20User
https://wimsy.im/login?jid=user%40example.com&password=test123&display_name=Test%20User

The link opens Wimsy and fills the JID, password, and display-name fields. The user must still tap Connect. Query parameter values must be URL-encoded. The web build includes /open-wimsy.html, which performs this custom-scheme handoff from a normal HTTPS URL. A connected web client can generate a same-origin handoff QR code from Export login to Android... in the presence menu.

Web deployment defaults

A deployment can pre-fill and enforce its WebTransport endpoint at compile time without changing the source:

flutter build web --release --no-web-resources-cdn \
  --dart-define=WIMSY_DEFAULT_JID=user@example.com \
  --dart-define=WIMSY_DEFAULT_WEBTRANSPORT_URL=https://xmpp.example.com/xmpp-webtransport \
  --dart-define=WIMSY_SERVER_CERTIFICATE_HASH=BASE64_SHA256_DIGEST

Always pass --no-web-resources-cdn when producing a deployable web build. This packages the Flutter renderer assets with the application instead of loading them from www.gstatic.com, so the deployed application is fully self-hosted.

For local web deployments, use tool/build_web.sh rather than invoking flutter build web directly. It assigns a build ID and creates update.json, which lets already-running and installed clients offer a reload when a newer build is deployed. An nginx configuration with appropriate cache headers and SPA routing is provided in deploy/nginx-wimsy.conf.

The certificate hash is the base64 encoding of the certificate's raw SHA-256 digest. When WIMSY_DEFAULT_WEBTRANSPORT_URL is non-empty, it overrides saved connection URLs and disables host-meta endpoint discovery for that web build.