expose event handler

apps/server/src/collaboration/collaboration.handler.ts

@@ -0,0 +1,42 @@
+import { Injectable, Logger } from '@nestjs/common';
+import { Hocuspocus, Document } from '@hocuspocus/server';
+
+export type CollabEventHandlers = ReturnType<
+  CollaborationHandler['getHandlers']
+>;
+
+@Injectable()
+export class CollaborationHandler {
+  private readonly logger = new Logger(CollaborationHandler.name);
+
+  constructor() {}
+
+  getHandlers(hocuspocus: Hocuspocus) {
+    return {
+      alterState: async (documentName: string, payload: { pageId: string }) => {
+        // dummy
+        // this.logger.log('Processing', documentName, payload);
+        // await this.withYdocConnection(hocuspocus, documentName, {}, (doc) => {
+        //   const fragment = doc.getXmlFragment('default');
+        //});
+      },
+    };
+  }
+
+  async withYdocConnection(
+    hocuspocus: Hocuspocus,
+    documentName: string,
+    context: any = {},
+    fn: (doc: Document) => void,
+  ): Promise<void> {
+    const connection = await hocuspocus.openDirectConnection(
+      documentName,
+      context,
+    );
+    try {
+      await connection.transact(fn);
+    } finally {
+      await connection.disconnect();
+    }
+  }
+}