ffi: Add binding for get_dm_room

bindings/matrix-sdk-ffi/src/client.rs

@@ -3,6 +3,7 @@ use std::sync::{Arc, RwLock};
 use anyhow::{anyhow, Context};
 use matrix_sdk::{
     media::{MediaFileHandle as SdkMediaFileHandle, MediaFormat, MediaRequest, MediaThumbnailSize},
+    room::Room as SdkRoom,
     ruma::{
         api::client::{
             account::whoami,
@@ -497,6 +498,13 @@ impl Client {
     pub fn rooms(&self) -> Vec<Arc<Room>> {
         self.client.rooms().into_iter().map(|room| Arc::new(Room::new(room))).collect()
     }
+
+    pub fn get_dm_room(&self, user_id: String) -> Result<Option<Arc<Room>>, ClientError> {
+        let user_id = UserId::parse(user_id)?;
+        let sdk_room = self.client.get_dm_room(&user_id).map(SdkRoom::Joined);
+        let dm = sdk_room.map(|room| Arc::new(Room::new(room)));
+        Ok(dm)
+    }
 }
 
 impl Client {

crates/matrix-sdk/src/encryption/mod.rs

@@ -339,7 +339,8 @@ impl Client {
         Ok(())
     }
 
-    fn get_dm_room(&self, user_id: &UserId) -> Option<room::Joined> {
+    /// Get the existing DM room with the given user, if any.
+    pub fn get_dm_room(&self, user_id: &UserId) -> Option<room::Joined> {
         let rooms = self.joined_rooms();
 
         // Find the room we share with the `user_id` and only with `user_id`