From 589af25b4513f7d731632765c9bacc73d7827786 Mon Sep 17 00:00:00 2001
From: Jannis Braun <151788261+TheZwiss@users.noreply.github.com>
Date: Fri, 27 Mar 2026 04:43:23 +0100
Subject: [PATCH] feat(federation): show toast on file_rejected federation
 event

---
 packages/web/src/hooks/useWebSocket.ts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/packages/web/src/hooks/useWebSocket.ts b/packages/web/src/hooks/useWebSocket.ts
index 54023d92..71e6baa8 100644
--- a/packages/web/src/hooks/useWebSocket.ts
+++ b/packages/web/src/hooks/useWebSocket.ts
@@ -605,6 +605,20 @@ function handleEvent(origin: string, event: ServerEvent): void {
       updateMessage(event.message as any);
       break;
 
+    case 'federation_file_rejected': {
+      const { addToast } = useUIStore.getState();
+      const users = event.affectedUsers;
+      if (users && users.length > 0) {
+        const parts = users.map(u => {
+          const limitMb = Math.round(u.limit / (1024 * 1024));
+          return `${u.username}'s instance (limit: ${limitMb} MB)`;
+        });
+        const msg = `File couldn't be cached on ${parts.join(' and ')}. They can still view it from yours.`;
+        addToast(msg, 'warning', 7000);
+      }
+      break;
+    }
+
     case 'dm_message_deleted':
       removeMessage(event.messageId, event.dmChannelId);
       break;