Add endpoint for getting supported login types

src/r0/session.rs

@@ -1,5 +1,6 @@
 //! Endpoints for user session management.
 
+pub mod get_login_types;
 pub mod login;
 pub mod logout;
 pub mod logout_all;

src/r0/session/get_login_types.rs

@@ -0,0 +1,32 @@
+//! [GET /_matrix/client/r0/login](https://matrix.org/docs/spec/client_server/r0.6.0#get-matrix-client-r0-login)
+
+use ruma_api::ruma_api;
+use serde::{Deserialize, Serialize};
+
+use super::login::LoginType;
+
+ruma_api! {
+    metadata {
+        description: "Gets the homeserver's supported login types to authenticate users. Clients should pick one of these and supply it as the type when logging in.",
+        method: GET,
+        name: "get_login_types",
+        path: "/_matrix/client/r0/login",
+        rate_limited: true,
+        requires_authentication: false,
+    }
+
+    request {}
+
+    response {
+        /// The homeserver's supported login types.
+        pub flows: Vec<LoginFlow>
+    }
+}
+
+/// A supported login type in a homeserver
+#[derive(Clone, Copy, Debug, Deserialize, Serialize)]
+pub struct LoginFlow {
+    /// The login type.
+    #[serde(rename = "type")]
+    pub login_type: LoginType,
+}