api: Add identity service status endpoint

ruma-identity-service-api/src/lib.rs

@@ -1 +1,2 @@
 pub mod authentication;
+pub mod status;

ruma-identity-service-api/src/status.rs

@@ -0,0 +1,3 @@
+//! Endpoint to check the status of an identity server.
+
+pub mod v2;

ruma-identity-service-api/src/status/v2.rs

@@ -0,0 +1,34 @@
+//! [GET /_matrix/identity/v2](https://matrix.org/docs/spec/identity_service/r0.3.0#get-matrix-identity-v2)
+
+use ruma_api::ruma_api;
+
+ruma_api! {
+    metadata: {
+        description: "Checks that an identity server is available at this API endpoint.",
+        method: GET,
+        name: "status",
+        path: "/_matrix/identity/v2",
+        authentication: None,
+        rate_limited: false,
+    }
+
+    #[derive(Default)]
+    request: {}
+
+    #[derive(Default)]
+    response: {}
+}
+
+impl Request {
+    /// Creates an empty `Request`.
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+impl Response {
+    /// Creates an empty `Response`.
+    pub fn new() -> Self {
+        Self {}
+    }
+}