Add /account/whoami endpoint

src/r0/account.rs

@@ -5,3 +5,4 @@ pub mod deactivate;
 pub mod register;
 pub mod request_password_change_token;
 pub mod request_register_token;
+pub mod whoami;

src/r0/account/whoami.rs

@@ -0,0 +1,22 @@
+//! [GET /_matrix/client/r0/account/whoami](https://matrix.org/docs/spec/client_server/r0.4.0.html#get-matrix-client-r0-account-whoami)
+
+use ruma_api_macros::ruma_api;
+use serde::{Deserialize, Serialize};
+
+ruma_api! {
+    metadata {
+        description: "Get information about the owner of a given access token.",
+        method: GET,
+        name: "whoami",
+        path: "/_matrix/client/r0/account/whoami",
+        rate_limited: true,
+        requires_authentication: true,
+    }
+
+    request {}
+
+    response {
+        /// The id of the user that owns the access token.
+        pub user_id: String,
+    }
+}