Collaborative editing (#1660)

server/commands/documentUpdater.js

@@ -0,0 +1,69 @@
+// @flow
+import { uniq } from "lodash";
+import { Node } from "prosemirror-model";
+import { schema, serializer } from "rich-markdown-editor";
+import { yDocToProsemirrorJSON } from "y-prosemirror";
+import * as Y from "yjs";
+import { Document, Event } from "../models";
+
+export default async function documentUpdater({
+  documentId,
+  ydoc,
+  userId,
+  done,
+}: {
+  documentId: string,
+  ydoc: Y.Doc,
+  userId: string,
+  done?: boolean,
+}) {
+  const document = await Document.findByPk(documentId);
+  const state = Y.encodeStateAsUpdate(ydoc);
+  const node = Node.fromJSON(schema, yDocToProsemirrorJSON(ydoc, "default"));
+  const text = serializer.serialize(node);
+
+  const isUnchanged = document.text === text;
+  const hasMultiplayerState = !!document.state;
+
+  if (isUnchanged && hasMultiplayerState) {
+    return;
+  }
+
+  // extract collaborators from doc user data
+  const pud = new Y.PermanentUserData(ydoc);
+  const pudIds = Array.from(pud.clients.values());
+  const existingIds = document.collaboratorIds;
+  const collaboratorIds = uniq([...pudIds, ...existingIds]);
+
+  await Document.scope("withUnpublished").update(
+    {
+      text,
+      state: Buffer.from(state),
+      updatedAt: isUnchanged ? document.updatedAt : new Date(),
+      lastModifiedById: isUnchanged ? document.lastModifiedById : userId,
+      collaboratorIds,
+    },
+    {
+      hooks: false,
+      where: {
+        id: documentId,
+      },
+    }
+  );
+
+  if (isUnchanged) {
+    return;
+  }
+
+  await Event.add({
+    name: "documents.update",
+    documentId: document.id,
+    collectionId: document.collectionId,
+    teamId: document.teamId,
+    actorId: userId,
+    data: {
+      multiplayer: true,
+      title: document.title,
+    },
+  });
+}