Sync whiteboard images and add board ownership

packages/shared-types/src/control.ts

@@ -3,6 +3,7 @@ import type { RoomMode, RoomState } from "./room.js";
 export interface ModeSetEvent {
   type: "mode.set";
   mode: RoomMode;
+  ownerId?: string | null;
 }
 
 export interface PresenterSetEvent {

packages/shared-types/src/room.ts

@@ -16,6 +16,7 @@ export interface RoomState {
   roomName: string;
   mode: RoomMode;
   presenterId: string | null;
+  whiteboardOwnerId?: string | null;
   annotationsLocked: boolean;
   updatedAt: number;
 }

packages/shared-types/src/whiteboard.ts

@@ -6,14 +6,22 @@ export interface WhiteboardElement {
   [key: string]: unknown;
 }
 
+export interface WhiteboardFile {
+  id: string;
+  url: string;
+  mimeType: string;
+}
+
 export interface WhiteboardPatchEvent {
   type: "whiteboard.patch";
   elements: WhiteboardElement[];
+  files?: WhiteboardFile[];
 }
 
 export interface WhiteboardSnapshotEvent {
   type: "whiteboard.snapshot";
   elements: WhiteboardElement[];
+  files?: WhiteboardFile[];
   backgroundColor: string;
 }
 
@@ -48,6 +56,22 @@ export function mergeWhiteboardElements(
   return [...byId.values()];
 }
 
+export function mergeWhiteboardFiles(
+  current: WhiteboardFile[],
+  incoming: WhiteboardFile[]
+): WhiteboardFile[] {
+  const byId = new Map<string, WhiteboardFile>();
+  for (const file of current) {
+    byId.set(file.id, file);
+  }
+  for (const file of incoming) {
+    if (!byId.has(file.id)) {
+      byId.set(file.id, file);
+    }
+  }
+  return [...byId.values()];
+}
+
 function isNewerElement(candidate: WhiteboardElement, existing: WhiteboardElement): boolean {
   if (candidate.version !== existing.version) {
     return candidate.version > existing.version;