client-api: Add MSC2965 feature and m.authentication discovery

crates/ruma-client-api/CHANGELOG.md

@@ -16,6 +16,7 @@ Improvements:
 
 * Add unstable support for querying relating events (MSC2675)
 * Move `filter::RelationType` to `ruma_common::events::relations`
+* Add unstable support for discovering an OpenID Connect server (MSC2965)
 
 # 0.14.1
 

crates/ruma-client-api/Cargo.toml

@@ -26,6 +26,7 @@ unstable-msc2675 = []
 unstable-msc2676 = []
 unstable-msc2677 = []
 unstable-msc2918 = []
+unstable-msc2965 = []
 unstable-msc3316 = []
 unstable-msc3440 = []
 unstable-msc3488 = []

crates/ruma-client-api/src/discovery/discover_homeserver.rs

@@ -32,6 +32,11 @@ ruma_api! {
         #[cfg(feature = "unstable-msc3488")]
         #[serde(rename = "org.matrix.msc3488.tile_server", alias = "m.tile_server")]
         pub tile_server: Option<TileServerInfo>,
+
+        /// Information about the authentication server to connect to when using OpenID Connect.
+        #[cfg(feature = "unstable-msc2965")]
+        #[serde(rename = "m.authentication")]
+        pub authentication: Option<AuthenticationServerInfo>,
     }
 
     error: crate::Error
@@ -52,6 +57,8 @@ impl Response {
             identity_server: None,
             #[cfg(feature = "unstable-msc3488")]
             tile_server: None,
+            #[cfg(feature = "unstable-msc2965")]
+            authentication: None,
         }
     }
 }
@@ -104,3 +111,25 @@ impl TileServerInfo {
         Self { map_style_url }
     }
 }
+
+/// Information about a discovered authentication server.
+#[cfg(feature = "unstable-msc2965")]
+#[derive(Clone, Debug, Deserialize, Hash, Serialize)]
+#[cfg_attr(not(feature = "unstable-exhaustive-types"), non_exhaustive)]
+pub struct AuthenticationServerInfo {
+    /// The OIDC Provider that is trusted by the homeserver.
+    pub issuer: String,
+
+    /// The URL where the user is able to access the account management
+    /// capabilities of the OIDC Provider.
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub account: Option<String>,
+}
+
+#[cfg(feature = "unstable-msc2965")]
+impl AuthenticationServerInfo {
+    /// Creates an `AuthenticationServerInfo` with the given `issuer` and an optional `account.
+    pub fn new(issuer: String, account: Option<String>) -> Self {
+        Self { issuer, account }
+    }
+}