[WEB-1322] dev: conflict free pages collaboration (#4463)

* chore: pages realtime

* chore: empty binary response

* chore: added a ypy package

* feat: pages collaboration

* chore: update fetching logic

* chore: degrade ypy version

* chore: replace useEffect fetch logic with useSWR

* chore: move all the update logic to the page store

* refactor: remove react-hook-form

* chore: save description_html as well

* chore: migrate old data logic

* fix: added description_binary as field name

* fix: code cleanup

* refactor: create separate hook to handle page description

* fix: build errors

* chore: combine updates instead of using the whole document

* chore: removed ypy package

* chore: added conflict resolving logic to the client side

* chore: add a save changes button

* chore: add read-only validation

* chore: remove saving state information

* chore: added permission class

* chore: removed the migration file

* chore: corrected the model field

* chore: rename pageStore to page

* chore: update collaboration provider

* chore: add try catch to handle error

---------

Co-authored-by: NarayanBavisetti <narayan3119@gmail.com>

packages/editor/document-editor/src/utils/yjs.ts

@@ -0,0 +1,76 @@
+import { Schema } from "@tiptap/pm/model";
+import { prosemirrorJSONToYDoc } from "y-prosemirror";
+import * as Y from "yjs";
+
+const defaultSchema: Schema = new Schema({
+  nodes: {
+    text: {},
+    doc: { content: "text*" },
+  },
+});
+
+/**
+ * @description converts ProseMirror JSON to Yjs document
+ * @param document prosemirror JSON
+ * @param fieldName
+ * @param schema
+ * @returns {Y.Doc} Yjs document
+ */
+export const proseMirrorJSONToBinaryString = (
+  document: any,
+  fieldName: string | Array<string> = "default",
+  schema?: Schema
+): string => {
+  if (!document) {
+    throw new Error(
+      `You've passed an empty or invalid document to the Transformer. Make sure to pass ProseMirror-compatible JSON. Actually passed JSON: ${document}`
+    );
+  }
+
+  // allow a single field name
+  if (typeof fieldName === "string") {
+    const yDoc = prosemirrorJSONToYDoc(schema ?? defaultSchema, document, fieldName);
+    const docAsUint8Array = Y.encodeStateAsUpdate(yDoc);
+    const base64Doc = Buffer.from(docAsUint8Array).toString("base64");
+    return base64Doc;
+  }
+
+  const yDoc = new Y.Doc();
+
+  fieldName.forEach((field) => {
+    const update = Y.encodeStateAsUpdate(prosemirrorJSONToYDoc(schema ?? defaultSchema, document, field));
+
+    Y.applyUpdate(yDoc, update);
+  });
+
+  const docAsUint8Array = Y.encodeStateAsUpdate(yDoc);
+  const base64Doc = Buffer.from(docAsUint8Array).toString("base64");
+
+  return base64Doc;
+};
+
+/**
+ * @description apply updates to a doc and return the updated doc in base64(binary) format
+ * @param {Uint8Array} document
+ * @param {Uint8Array} updates
+ * @returns {string} base64(binary) form of the updated doc
+ */
+export const applyUpdates = (document: Uint8Array, updates: Uint8Array): string => {
+  const yDoc = new Y.Doc();
+  Y.applyUpdate(yDoc, document);
+  Y.applyUpdate(yDoc, updates);
+
+  const encodedDoc = Y.encodeStateAsUpdate(yDoc);
+  const base64Updates = Buffer.from(encodedDoc).toString("base64");
+  return base64Updates;
+};
+
+/**
+ * @description merge multiple updates into one single update
+ * @param {Uint8Array[]} updates
+ * @returns {Uint8Array} merged updates
+ */
+export const mergeUpdates = (updates: Uint8Array[]): Uint8Array => {
+  const mergedUpdates = Y.mergeUpdates(updates);
+  return mergedUpdates;
+};