community: friends, two signed answers on one request carried over soulseek, one answer is only ever pending

src-tauri/src/slsk_link.rs

@@ -150,7 +150,7 @@ async fn send_pm(app: &tauri::AppHandle, to: &str, text: &str) -> Result<(), Str
 
 /// Ask `username` over Soulseek for their signed SoulStream ID and verify
 /// the answer. One PM out, one in, thirty seconds at most.
-async fn ask(app: &tauri::AppHandle, username: &str) -> Result<KnownLink, String> {
+pub(crate) async fn ask(app: &tauri::AppHandle, username: &str) -> Result<KnownLink, String> {
     let target = sl::normalize_username(username);
     if target.is_empty() {
         return Err("no username".into());
@@ -278,6 +278,21 @@ pub async fn intercept_pm(app: &tauri::AppHandle, from: &str, message: &str) ->
     false
 }
 
+/// A verified link for `username`, if this device holds one.
+pub(crate) fn known_link(app: &tauri::AppHandle, username: &str) -> Option<KnownLink> {
+    load(app)
+        .others
+        .get(&sl::normalize_username(username))
+        .cloned()
+}
+/// Keep a link another service verified (the friends handshake binds a
+/// request's key to its sender the same way the drawer's Ask does).
+pub(crate) fn remember(app: &tauri::AppHandle, link: KnownLink) {
+    let mut links = load(app);
+    links.others.insert(link.username_normalized.clone(), link);
+    let _ = save(app, &links);
+}
+
 // ---------------------------------------------------------------- commands
 
 #[tauri::command]