35e9c9e1ea
Squashed commit of the following: commit bd9fd5cd3cf3f1301df18074c997ec537a81b4f5 Author: Elliu <elliu@hashi.re> Date: Sat Nov 15 15:32:18 2025 +0900 Revert "fix matrix / db resource cleanup on space unlink" This reverts commit ccc10564f1e33ab277bc15f360b8c65f2d0ea867. commit eec559293861305394770343d501389905fe1650 Author: Cadence Ember <cadence@disroot.org> Date: Sat Nov 8 13:01:59 2025 +1300 Dependency inject snow for testing commit b45eeb150e0702c201b8f710a3bdaa8e9f7d90be Author: Elliu <elliu@hashi.re> Date: Wed Nov 5 00:20:20 2025 +0900 manually revert 3597a3b: "Factorize some of the space link/unlink sanity checks" commit 0f2e575df21bf940e4780c30d2701da989f62471 Author: Elliu <elliu@hashi.re> Date: Wed Nov 5 00:04:38 2025 +0900 on unbriding room, also demote powel level of bridge user in matrix room commit ccc10564f1e33ab277bc15f360b8c65f2d0ea867 Author: Elliu <elliu@hashi.re> Date: Wed Nov 5 00:04:13 2025 +0900 fix matrix / db resource cleanup on space unlink commit f4c1ea7c7f7d5a265b84ce464cd8e9e26d934a32 Author: Elliu <elliu@hashi.re> Date: Tue Nov 4 23:54:41 2025 +0900 /unlink-space: properly leave guild and clean DB commit 5f0ec3b2c861cc8b9edc51389d6176c7a22a1135 Author: Cadence Ember <cadence@disroot.org> Date: Sun Nov 2 22:31:14 2025 +1300 Improve HTML to a state I'm happy with commit 16309f26b3dd72927e05454cee8c63504b447b7f Author: Elliu <elliu@hashi.re> Date: Sat Nov 1 22:24:51 2025 +0900 add tests from /unlink-space endpoint commit 5aff6f9048330a86eda3b2d1862f42df8d2bad84 Author: Elliu <elliu@hashi.re> Date: Sat Sep 6 20:05:18 2025 +0900 Add /api/unlink-space implementation commit dfc61594f68db4b52b3553ac7d3561ae9ce13b49 Author: Elliu <elliu@hashi.re> Date: Sat Sep 6 19:59:44 2025 +0900 Extract /api/unlink code to its own function commit 3597a3b5ce9dde3a9ddfe0853253bfda91a38335 Author: Elliu <elliu@hashi.re> Date: Sat Sep 6 19:28:42 2025 +0900 Factorize some of the space link/unlink sanity checks commit 05d788e26394106d9be24cef8b38f6c6f1e4c984 Author: Elliu <elliu@hashi.re> Date: Sat Sep 6 18:23:01 2025 +0900 Add button to unlink a space Co-authored-by: Cadence Ember <cadence@disroot.org>
Out Of Your Element
Modern Matrix-to-Discord appservice bridge, created by @cadence:cadence.moe
Why a new bridge?
- Modern: Supports new Discord features like replies, threads and stickers, and new Matrix features like edits, spaces and space membership.
- Efficient: Special attention has been given to memory usage, database indexes, disk footprint, runtime algorithms, and queries to the homeserver. Efficiency details.
- Reliable: Any errors on either side are notified on Matrix and can be retried. Messages sent during bridge downtime will still be bridged after it comes back up.
- Tested: A test suite and code coverage make sure all the logic and special cases work.
- Simple development: No build step (it's JavaScript, not TypeScript), minimal/lightweight dependencies, and abstraction only where necessary so that less background knowledge is required. No need to learn about Intents or library functions.
- No locking algorithm: Other bridges use a locking algorithm which is a source of frequent bugs. This bridge avoids the need for one.
- Latest API: Being on the latest Discord API version lets it access all features, without the risk of deprecated API versions being removed.
What works?
Most features you'd expect in both directions: messages, edits, deletions, formatting (including spoilers), reactions, custom emojis, custom emoji reactions, mentions, channel mentions, replies, threads, stickers (all formats: PNG, APNG, GIF, Lottie), attachments, spoiler attachments (compatible with most clients), embeds, URL previews, presence, discord.com hyperlinks, and more.
Metadata is also synced: people's names, avatars, usernames; channel names, icons, topics; spaces containing rooms; custom emoji lists. Syncing Matrix rooms, room icons, and topics is optional: you can keep them different from the Discord ones if you prefer.
I've also added some interesting features that I haven't seen in any other bridge:
- Members using the PluralKit bot each get their own persistent accounts
- Replies from PluralKit members are restyled into native Matrix replies
- Simulated user accounts are named @the_persons_username rather than @112233445566778899
- Matrix custom emojis from private rooms are still visible on Discord as a sprite sheet
- To save space, larger files from Discord are linked instead of reuploaded to Matrix (links don't expire)
For more information about features, see the user guide.
Caveats
- This bridge is not designed for puppetting.
- Direct Messaging is not supported until I figure out a good way of doing it.