feat(auth): add username sign-in mode and recovery kits (#3215)

fluxer_admin/src/middleware/account_identity.rs

@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: AGPL-3.0-or-later
+
+use crate::{
+    api::client::AdminApiClient, middleware::auth::AuthContext, state::AppState,
+    utils::user_tag::with_unique_usernames,
+};
+use axum::{
+    extract::{Request, State},
+    middleware::Next,
+    response::Response,
+};
+
+pub async fn scope_account_identity(
+    State(state): State<AppState>,
+    request: Request,
+    next: Next,
+) -> Response {
+    let Some(auth) = request.extensions().get::<AuthContext>() else {
+        return next.run(request).await;
+    };
+    let client = AdminApiClient::new(state.http_client(), state.config(), &auth.session);
+    let settings = state.account_identity_settings(&client).await;
+    let unique_usernames = settings.mode.is_username() || settings.tag_style.is_none();
+    with_unique_usernames(unique_usernames, next.run(request)).await
+}

fluxer_admin/src/middleware/mod.rs

@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: AGPL-3.0-or-later
 
+pub mod account_identity;
 pub mod auth;
 pub mod csrf;
 pub mod error_handler;