feat(spaces): hierarchy over federation

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/api/server_server.rs

@@ -28,6 +28,7 @@ use ruma::{
 			keys::{claim_keys, get_keys},
 			membership::{create_invite, create_join_event, prepare_join_event},
 			query::{get_profile_information, get_room_information},
+			space::get_hierarchy,
 			transactions::{
 				edu::{DeviceListUpdateContent, DirectDeviceContent, Edu, SigningKeyUpdateContent},
 				send_transaction_message,
@@ -1734,6 +1735,20 @@ pub async fn well_known_server_route() -> Result<impl IntoResponse> {
 	})))
 }
 
+/// # `GET /_matrix/federation/v1/hierarchy/{roomId}`
+///
+/// Gets the space tree in a depth-first manner to locate child rooms of a given
+/// space.
+pub async fn get_hierarchy_route(body: Ruma<get_hierarchy::v1::Request>) -> Result<get_hierarchy::v1::Response> {
+	let sender_servername = body.sender_servername.as_ref().expect("server is authenticated");
+
+	if services().rooms.metadata.exists(&body.room_id)? {
+		services().rooms.spaces.get_federation_hierarchy(&body.room_id, sender_servername, body.suggested_only).await
+	} else {
+		Err(Error::BadRequest(ErrorKind::NotFound, "Room does not exist."))
+	}
+}
+
 #[cfg(test)]
 mod tests {
 	use super::{add_port_to_hostname, get_ip_with_port, FedDest};