Add a config option to show all local users in user directory, closes #260

src/api/client/user_directory.rs

@@ -1,6 +1,7 @@
 use axum::extract::State;
 use futures::{FutureExt, StreamExt, pin_mut};
 use ruma::{
+	UserId,
 	api::client::user_directory::search_users::{self},
 	events::room::join_rules::JoinRule,
 };
@@ -11,6 +12,7 @@ use tuwunel_core::{
 		stream::{BroadbandExt, ReadyExt},
 	},
 };
+use tuwunel_service::Services;
 
 use crate::Ruma;
 
@@ -42,45 +44,19 @@ pub(crate) async fn search_users_route(
 		.broad_filter_map(async |user_id| {
 			let display_name = services.users.displayname(&user_id).await.ok();
 
-			let user_id_matches = user_id
-				.as_str()
-				.to_lowercase()
-				.contains(&search_term);
-
-			let display_name_matches = display_name
-				.as_deref()
-				.map(str::to_lowercase)
-				.is_some_and(|display_name| display_name.contains(&search_term));
-
-			if !user_id_matches && !display_name_matches {
-				return None;
-			}
-
-			let user_in_public_room = services
-				.state_cache
-				.rooms_joined(&user_id)
-				.map(ToOwned::to_owned)
-				.broad_any(async |room_id| {
-					services
-						.state_accessor
-						.get_join_rules(&room_id)
-						.map(|rule| matches!(rule, JoinRule::Public))
-						.await
-				});
-
-			let user_sees_user = services
-				.state_cache
-				.user_sees_user(sender_user, &user_id);
-
-			pin_mut!(user_in_public_room, user_sees_user);
-			user_in_public_room
-				.or(user_sees_user)
-				.await
-				.then_some(search_users::v3::User {
-					user_id: user_id.clone(),
-					display_name,
-					avatar_url: services.users.avatar_url(&user_id).await.ok(),
-				})
+			should_show_user(
+				&services,
+				sender_user,
+				&user_id,
+				display_name.as_deref(),
+				&search_term,
+			)
+			.await
+			.then_some(search_users::v3::User {
+				user_id: user_id.clone(),
+				display_name,
+				avatar_url: services.users.avatar_url(&user_id).await.ok(),
+			})
 		});
 
 	pin_mut!(users);
@@ -89,3 +65,51 @@ pub(crate) async fn search_users_route(
 
 	Ok(search_users::v3::Response { results, limited })
 }
+
+async fn should_show_user(
+	services: &Services,
+	sender_user: &UserId,
+	target_user: &UserId,
+	target_display_name: Option<&str>,
+	search_term: &str,
+) -> bool {
+	let user_id_matches = target_user
+		.as_str()
+		.to_lowercase()
+		.contains(search_term);
+
+	let display_name_matches = target_display_name
+		.map(str::to_lowercase)
+		.is_some_and(|display_name| display_name.contains(search_term));
+
+	if !user_id_matches && !display_name_matches {
+		return false;
+	}
+
+	if services
+		.server
+		.config
+		.show_all_local_users_in_user_directory
+	{
+		return true;
+	}
+
+	let user_in_public_room = services
+		.state_cache
+		.rooms_joined(target_user)
+		.map(ToOwned::to_owned)
+		.broad_any(async |room_id| {
+			services
+				.state_accessor
+				.get_join_rules(&room_id)
+				.map(|rule| matches!(rule, JoinRule::Public))
+				.await
+		});
+
+	let user_sees_user = services
+		.state_cache
+		.user_sees_user(sender_user, target_user);
+
+	pin_mut!(user_in_public_room, user_sees_user);
+	user_in_public_room.or(user_sees_user).await
+}

src/core/config/mod.rs

@@ -674,6 +674,14 @@ pub struct Config {
 	#[serde(default = "true_fn")]
 	pub allow_unlisted_room_search_by_id: bool,
 
+	/// Show all local users in user directory. With this set to false, only
+	/// users in public rooms or those that share a room with the user making
+	/// the search will be shown.
+	///
+	/// default: false
+	#[serde(default)]
+	pub show_all_local_users_in_user_directory: bool,
+
 	/// Allow guests/unauthenticated users to access TURN credentials.
 	///
 	/// This is the equivalent of Synapse's `turn_allow_guests` config option.

tuwunel-example.toml

@@ -538,6 +538,12 @@
 #
 #allow_unlisted_room_search_by_id = true
 
+# Show all local users in user directory. With this set to false, only
+# users in public rooms or those that share a room with the user making
+# the search will be shown.
+#
+#show_all_local_users_in_user_directory = false
+
 # Allow guests/unauthenticated users to access TURN credentials.
 #
 # This is the equivalent of Synapse's `turn_allow_guests` config option.