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feat(api): implement MSC4143 RTC transports discovery endpoint #1442

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nex merged 5 commits from 0xnim/continuwuity:feat/msc4143-rtc-transports-endpoint into main 2026-02-24 01:00:58 +00:00
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0xnim commented 2026-02-23 08:18:58 +00:00
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Add dedicated GET /_matrix/client/v1/rtc/transports and GET /_matrix/client/unstable/org.matrix.msc4143/rtc/transports endpoints for MatrixRTC focus discovery (MSC4143), replacing the deprecated well-known approach.

Move RTC foci configuration from [global.well_known] into a new [global.matrix_rtc] config section with a foci field. Remove rtc_foci from the .well-known/matrix/client response. Update LiveKit setup documentation accordingly.

Closes #1431

This pull request implements the dedicated MatrixRTC transport discovery endpoints defined in MSC4143. Previously in the .well-known/matrix/client response under the org.matrix.msc4143.rtc_foci key, which is now considered deprecated. The new dedicated endpoints (/_matrix/client/v1/rtc/transports stable and /_matrix/client/unstable/org.matrix.msc4143/rtc/transports unstable) provide the same information through a proper client API route.

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Add dedicated `GET /_matrix/client/v1/rtc/transports` and `GET /_matrix/client/unstable/org.matrix.msc4143/rtc/transports` endpoints for MatrixRTC focus discovery (MSC4143), replacing the deprecated well-known approach. Move RTC foci configuration from `[global.well_known]` into a new `[global.matrix_rtc]` config section with a `foci` field. Remove `rtc_foci` from the `.well-known/matrix/client` response. Update LiveKit setup documentation accordingly. Closes #1431 <!-- In order to help reviewers know what your pull request does at a glance, you should ensure that 1. Your PR title is a short, single sentence describing what you changed 2. You have described in more detail what you have changed, why you have changed it, what the intended effect is, and why you think this will be beneficial to the project. If you have made any potentially strange/questionable design choices, but didn't feel they'd benefit from code comments, please don't mention them here - after opening your pull request, go to "files changed", and click on the "+" symbol in the line number gutter, and attach comments to the lines that you think would benefit from some clarification. --> This pull request implements the dedicated MatrixRTC transport discovery endpoints defined in MSC4143. Previously in the .well-known/matrix/client response under the org.matrix.msc4143.rtc_foci key, which is now considered deprecated. The new dedicated endpoints (`/_matrix/client/v1/rtc/transports` stable and `/_matrix/client/unstable/org.matrix.msc4143/rtc/transports` unstable) provide the same information through a proper client API route. <!-- Example: This pull request allows us to warp through time and space ten times faster than before by double-inverting the warp drive with hyperheated jump fluid, both making the drive faster and more efficient. This resolves the common issue where we have to wait more than 10 milliseconds to engage, use, and disengage the warp drive when travelling between galaxies. --> <!-- Fixes: #... --> <!-- Uncomment the above line(s) if your pull request fixes an issue or closes another pull request by superseding it. Replace `#...` with the issue/pr number, such as `#123`. --> **Pull request checklist:** <!-- You need to complete these before your PR can be considered. 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feat(api): implement MSC4143 RTC transports discovery endpoint
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Add dedicated \`GET /_matrix/client/v1/rtc/transports\` and \`GET /_matrix/client/unstable/org.matrix.msc4143/rtc/transports\` endpoints for MatrixRTC focus discovery (MSC4143), replacing the deprecated well-known approach.

Move RTC foci configuration from \`[global.well_known]\` into a new \`[global.matrix_rtc]\` config section with a \`foci\` field. Remove \`rtc_foci\` from the \`.well-known/matrix/client\` response. Update LiveKit setup documentation accordingly.

Closes #1431
chore(changelog): add news fragment for #1442
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Jade requested changes 2026-02-23 15:06:36 +00:00
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The main thing is compatibillity - at the moment this breaks compatibility with existing configurations and the currently released version of EC. Once that's done, I'm OK to merge

The main thing is compatibillity - at the moment this breaks compatibility with existing configurations and the currently released version of EC. Once that's done, I'm OK to merge
src/api/client/well_known.rs Outdated
@ -28,3 +28,3 @@
sliding_sync_proxy: Some(SlidingSyncProxyInfo { url: client_url }),
tile_server: None,
rtc_foci: services.config.well_known.rtc_focus_server_urls.clone(),
rtc_foci: vec![],
Jade commented 2026-02-23 14:35:06 +00:00
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Rather than removing this, it should be kept for a time until most clients stop using it

Rather than removing this, it should be kept for a time until most clients stop using it
Jade commented 2026-02-23 15:05:30 +00:00
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(Element Call hasn't released the version that replaces it, and they don't have a migration so we'll have to support both for a time)

(Element Call hasn't released the version that replaces it, and they don't have a migration so we'll have to support both for a time)
Jade commented 2026-02-23 15:35:19 +00:00
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I lie, they do include a fallback, but the version that uses the new endpoint hasn't been released yet

I lie, they do include a fallback, but the version that uses the new endpoint hasn't been released yet
0xnim marked this conversation as resolved
src/api/router.rs Outdated
@ -187,0 +191,4 @@
.route(
"/_matrix/client/unstable/org.matrix.msc4143/rtc/transports",
get(client::get_rtc_transports),
)
Jade commented 2026-02-23 15:04:45 +00:00
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Ideally should be a ruma route if you can pull that into ruwuma. If not, can fix later.

Ideally should be a ruma route if you can pull that into ruwuma. If not, can fix later.
0xnim commented 2026-02-23 19:21:49 +00:00
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@Jade is this good for ruwuma? continuwuation/ruwuma#48

@Jade is this good for ruwuma? continuwuation/ruwuma#48
0xnim marked this conversation as resolved
src/core/config/mod.rs Outdated
@ -2137,4 +2134,0 @@
///
/// default: []
#[serde(default = "default_rtc_focus_urls")]
pub rtc_focus_server_urls: Vec<RtcFocusInfo>,
Jade commented 2026-02-23 15:05:47 +00:00
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Can we keep compatibility with existing configs so people don't have to update their settings, even if it's just hiding this and using it as the default value for the new option?

Can we keep compatibility with existing configs so people don't have to update their settings, even if it's just hiding this and using it as the default value for the new option?
0xnim marked this conversation as resolved
nex added this to the next milestone 2026-02-23 16:00:24 +00:00
0xnim changed title from feat(api): implement MSC4143 RTC transports discovery endpoint to WIP: feat(api): implement MSC4143 RTC transports discovery endpoint 2026-02-23 17:51:13 +00:00
fix(api): restore backwards compatibility for RTC foci config
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7bb6317804
chore(deps): update ruwuma revision
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0xnim changed title from WIP: feat(api): implement MSC4143 RTC transports discovery endpoint to feat(api): implement MSC4143 RTC transports discovery endpoint 2026-02-23 23:00:51 +00:00
0xnim force-pushed feat/msc4143-rtc-transports-endpoint from cddb163f94
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to 1e6d95583c
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2026-02-23 23:01:17 +00:00 Compare
0xnim commented 2026-02-23 23:08:08 +00:00
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I need to change the fragment

I need to change the fragment
fixup! fix(api): restore backwards compatibility for RTC foci config
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763d9b3de8
nex approved these changes 2026-02-23 23:11:12 +00:00
nex merged commit 763d9b3de8 into main 2026-02-24 01:00:58 +00:00
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