From 9a8d7bf4759ed3d9bab02c395ff9ab38285ada2b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?K=C3=A9vin=20Commaille?= <zecakeh@tedomum.fr>
Date: Mon, 20 Jun 2022 19:03:21 +0200
Subject: [PATCH] api: Get the default room version for a Matrix version

---
 crates/ruma-common/src/api/metadata.rs | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/crates/ruma-common/src/api/metadata.rs b/crates/ruma-common/src/api/metadata.rs
index 6be0d5ee..c7f233a8 100644
--- a/crates/ruma-common/src/api/metadata.rs
+++ b/crates/ruma-common/src/api/metadata.rs
@@ -6,6 +6,7 @@ use std::{
 use http::Method;
 
 use super::{error::UnknownVersionError, AuthScheme};
+use crate::RoomVersionId;
 
 /// Metadata about an API endpoint.
 #[derive(Clone, Debug)]
@@ -228,6 +229,20 @@ impl MatrixVersion {
             _ => Err(UnknownVersionError),
         }
     }
+
+    /// Get the default [`RoomVersionId`] for this `MatrixVersion`.
+    pub fn default_room_version(&self) -> RoomVersionId {
+        match self {
+            // <https://matrix.org/docs/spec/index.html#complete-list-of-room-versions>
+            MatrixVersion::V1_0
+            // <https://spec.matrix.org/v1.1/rooms/#complete-list-of-room-versions>
+            | MatrixVersion::V1_1
+            // <https://spec.matrix.org/v1.2/rooms/#complete-list-of-room-versions>
+            | MatrixVersion::V1_2 => RoomVersionId::V6,
+            // <https://spec.matrix.org/v1.3/rooms/#complete-list-of-room-versions>
+            MatrixVersion::V1_3 => RoomVersionId::V9,
+        }
+    }
 }
 
 impl Display for MatrixVersion {