Sign nostr event from websocket

app/soapbox/actions/streaming.ts

@@ -95,7 +95,7 @@ const connectTimelineStream = (
       dispatch(disconnectTimeline(timelineId));
     },
 
-    onReceive(data: any) {
+    onReceive(websocket, data: any) {
       switch (data.event) {
         case 'update':
           dispatch(processTimelineUpdate(timelineId, JSON.parse(data.payload), accept));
@@ -181,6 +181,15 @@ const connectTimelineStream = (
         case 'marker':
           dispatch({ type: MARKER_FETCH_SUCCESS, marker: JSON.parse(data.payload) });
           break;
+        case 'nostr:signEvent':
+          (async () => {
+            const event = await window.nostr?.signEvent(JSON.parse(data.payload));
+
+            if (event) {
+              websocket.send(JSON.stringify({ event: 'nostr:event', payload: event }));
+            }
+          })();
+          break;
       }
     },
   };

app/soapbox/stream.ts

@@ -8,10 +8,18 @@ import type { AppDispatch, RootState } from 'soapbox/store';
 
 const randomIntUpTo = (max: number) => Math.floor(Math.random() * Math.floor(max));
 
+interface ConnectStreamCallbacks {
+  onConnect(): void
+  onDisconnect(): void
+  onReceive(websocket: WebSocket, data: unknown): void
+}
+
+type PollingRefreshFn = (dispatch: AppDispatch, done?: () => void) => void
+
 export function connectStream(
   path: string,
-  pollingRefresh: ((dispatch: AppDispatch, done?: () => void) => void) | null = null,
-  callbacks: (dispatch: AppDispatch, getState: () => RootState) => Record<string, any> = () => ({ onConnect() {}, onDisconnect() {}, onReceive() {} }),
+  pollingRefresh: PollingRefreshFn | null = null,
+  callbacks: (dispatch: AppDispatch, getState: () => RootState) => ConnectStreamCallbacks,
 ) {
   return (dispatch: AppDispatch, getState: () => RootState) => {
     const streamingAPIBaseURL = getState().instance.urls.get('streaming_api');
@@ -35,7 +43,7 @@ export function connectStream(
       }
     };
 
-    let subscription: WebSocketClient;
+    let subscription: WebSocket;
 
     // If the WebSocket fails to be created, don't crash the whole page,
     // just proceed without a subscription.
@@ -58,7 +66,7 @@ export function connectStream(
         },
 
         received(data) {
-          onReceive(data);
+          onReceive(subscription, data);
         },
 
         reconnected() {

app/soapbox/types/nostr.ts

@@ -0,0 +1,8 @@
+import type { Event, EventTemplate } from 'nostr-tools';
+
+interface Nostr {
+  getPublicKey(): Promise<string>
+  signEvent(event: EventTemplate): Promise<Event>
+}
+
+export default Nostr;

app/soapbox/types/window.d.ts

@@ -0,0 +1,7 @@
+import type Nostr from './nostr';
+
+declare global {
+  interface Window {
+    nostr?: Nostr
+  }
+}