feat: Add config option for livekit

This adds a new config option under `global.well_known` for livekit
server URLs.  It also updates the well_known client API endpoint to
return this list.

Closes #1355

conduwuit-example.toml

@@ -1820,6 +1820,19 @@
 #
 #support_mxid =
 
+# A list of MatrixRTC foci URLs which will be served as part of the
+# MSC4143 client endpoint at /.well-known/matrix/client.  If you're
+# setting up livekit, you'd want something like:
+# rtc_focus_server_urls = [
+#     { type = "livekit", server_url = "https://livekit.example.com" },
+# ]
+#
+# To disable, set this to be an empty vector (`[]`).
+#
+# Defaults to: []
+#
+#rtc_focus_server_urls =
+
 [global.blurhashing]
 
 # blurhashing x component, 4 is recommended by https://blurha.sh/

src/api/client/well_known.rs

@@ -27,6 +27,7 @@ pub(crate) async fn well_known_client(
 		identity_server: None,
 		sliding_sync_proxy: Some(SlidingSyncProxyInfo { url: client_url }),
 		tile_server: None,
+		rtc_foci: services.config.well_known.rtc_focus_server_urls.clone(),
 	})
 }
 

src/core/config/mod.rs

@@ -19,7 +19,7 @@ pub use figment::{Figment, value::Value as FigmentValue};
 use regex::RegexSet;
 use ruma::{
 	OwnedRoomId, OwnedRoomOrAliasId, OwnedServerName, OwnedUserId, RoomVersionId,
-	api::client::discovery::discover_support::ContactRole,
+	api::client::discovery::{discover_homeserver::RtcFocusInfo, discover_support::ContactRole},
 };
 use serde::{Deserialize, de::IgnoredAny};
 use url::Url;
@@ -2111,6 +2111,19 @@ pub struct WellKnownConfig {
 	/// If no email or mxid is specified, all of the server's admins will be
 	/// listed.
 	pub support_mxid: Option<OwnedUserId>,
+
+	/// A list of MatrixRTC foci URLs which will be served as part of the
+	/// MSC4143 client endpoint at /.well-known/matrix/client.  If you're
+	/// setting up livekit, you'd want something like:
+	/// rtc_focus_server_urls = [
+	///     { type = "livekit", server_url = "https://livekit.example.com" },
+	/// ]
+	///
+	/// To disable, set this to be an empty vector (`[]`).
+	///
+	/// Defaults to: []
+	#[serde(default = "default_rtc_focus_urls")]
+	pub rtc_focus_server_urls: Vec<RtcFocusInfo>,
 }
 
 #[derive(Clone, Copy, Debug, Deserialize, Default)]
@@ -2608,6 +2621,9 @@ fn default_rocksdb_stats_level() -> u8 { 1 }
 #[inline]
 pub fn default_default_room_version() -> RoomVersionId { RoomVersionId::V11 }
 
+#[must_use]
+pub fn default_rtc_focus_urls() -> Vec<RtcFocusInfo> { vec![] }
+
 fn default_ip_range_denylist() -> Vec<String> {
 	vec![
 		"127.0.0.0/8".to_owned(),