Can get the list of joined rooms by user

src/main.rs

@@ -57,6 +57,7 @@ async fn main() -> std::io::Result<()> {
             .route("/api", web::get().to(api::api_home))
             .route("/api", web::post().to(api::api_home))
             .route("/api/account/whoami", web::get().to(api::account::who_am_i))
+            .route("/api/room/joined", web::get().to(api::room::joined_rooms))
             .route("/api/room/{room_id}", web::get().to(api::room::info))
             .route(
                 "/api/media/{server_name}/{media_id}/download",

src/server/api/room.rs

@@ -2,11 +2,27 @@ use crate::extractors::client_auth::APIClientAuth;
 use crate::server::{HttpFailure, HttpResult};
 use crate::utils::matrix_utils::ApiMxcURI;
 use actix_web::{web, HttpResponse};
-use ruma::api::client::state;
+use ruma::api::client::{membership, state};
 use ruma::events::StateEventType;
 use ruma::{OwnedMxcUri, OwnedRoomId};
 use serde::de::DeserializeOwned;
 
+#[derive(serde::Serialize)]
+struct GetRoomsMembershipsResponse {
+    rooms: Vec<OwnedRoomId>,
+}
+
+/// Get the list of rooms the user has joined
+pub async fn joined_rooms(auth: APIClientAuth) -> HttpResult {
+    let res = auth
+        .send_request(membership::joined_rooms::v3::Request::default())
+        .await?;
+
+    Ok(HttpResponse::Ok().json(GetRoomsMembershipsResponse {
+        rooms: res.joined_rooms,
+    }))
+}
+
 #[derive(serde::Deserialize)]
 pub struct RoomIDInPath {
     room_id: OwnedRoomId,