13.6.3

Ytext cleanup 538 refactor

README.md

@@ -169,6 +169,9 @@ PORT=1234 node ./node_modules/y-websocket/bin/server.js
 ### Example: Observe types
 
 ```js
+import * as Y from 'yjs';
+
+const doc = new Y.Doc();
 const yarray = doc.getArray('my-array')
 yarray.observe(event => {
   console.log('yarray was modified')
@@ -753,6 +756,30 @@ currentState1 = Y.mergeUpdates([currentState1, diff2])
 currentState1 = Y.mergeUpdates([currentState1, diff1])
 ```
 
+#### Obfuscating Updates
+
+If one of your users runs into a weird bug (e.g. the rich-text editor throws
+error messages), then you don't have to request the full document from your
+user. Instead, they can obfuscate the document (i.e. replace the content with
+meaningless generated content) before sending it to you. Note that someone might
+still deduce the type of content by looking at the general structure of the
+document. But this is much better than requesting the original document.
+
+Obfuscated updates contain all the CRDT-related data that is required for
+merging. So it is safe to merge obfuscated updates.
+
+```javascript
+const ydoc = new Y.Doc()
+// perform some changes..
+ydoc.getText().insert(0, 'hello world')
+const update = Y.encodeStateAsUpdate(ydoc)
+// the below update contains scrambled data
+const obfuscatedUpdate = Y.obfuscateUpdate(update)
+const ydoc2 = new Y.Doc()
+Y.applyUpdate(ydoc2, obfuscatedUpdate)
+ydoc2.getText().toString() // => "00000000000"
+```
+
 #### Using V2 update format
 
 Yjs implements two update formats. By default you are using the V1 update format.

package-lock.json

@@ -1,15 +1,15 @@
 {
   "name": "yjs",
-  "version": "13.5.52",
+  "version": "13.6.3",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "yjs",
-      "version": "13.5.52",
+      "version": "13.6.3",
       "license": "MIT",
       "dependencies": {
-        "lib0": "^0.2.72"
+        "lib0": "^0.2.74"
       },
       "devDependencies": {
         "@rollup/plugin-commonjs": "^24.0.1",
@@ -2481,9 +2481,9 @@
       }
     },
     "node_modules/lib0": {
-      "version": "0.2.73",
+      "version": "0.2.74",
-      "resolved": "https://registry.npmjs.org/lib0/-/lib0-0.2.73.tgz",
+      "resolved": "https://registry.npmjs.org/lib0/-/lib0-0.2.74.tgz",
-      "integrity": "sha512-aJJIElCLWnHMcYZPtsM07QoSfHwpxCy4VUzBYGXFYEmh/h2QS5uZNbCCfL0CqnkOE30b7Tp9DVfjXag+3qzZjQ==",
+      "integrity": "sha512-roj9i46/JwG5ik5KNTkxP2IytlnrssAkD/OhlAVtE+GqectrdkfR+pttszVLrOzMDeXNs1MPt6yo66MUolWSiA==",
       "dependencies": {
         "isomorphic.js": "^0.2.4"
       },

package.json

@@ -1,6 +1,6 @@
 {
   "name": "yjs",
-  "version": "13.5.52",
+  "version": "13.6.3",
   "description": "Shared Editing Library",
   "main": "./dist/yjs.cjs",
   "module": "./dist/yjs.mjs",
@@ -75,7 +75,7 @@
   },
   "homepage": "https://docs.yjs.dev",
   "dependencies": {
-    "lib0": "^0.2.72"
+    "lib0": "^0.2.74"
   },
   "devDependencies": {
     "@rollup/plugin-commonjs": "^24.0.1",

src/index.js

@@ -90,7 +90,11 @@ export {
   diffUpdateV2,
   convertUpdateFormatV1ToV2,
   convertUpdateFormatV2ToV1,
-  UpdateEncoderV1
+  obfuscateUpdate,
+  obfuscateUpdateV2,
+  UpdateEncoderV1,
+  equalDeleteSets,
+  snapshotContainsUpdate
 } from './internals.js'
 
 const glo = /** @type {any} */ (typeof globalThis !== 'undefined'

src/types/YMap.js

@@ -206,9 +206,11 @@ export class YMap extends AbstractType {
 
   /**
    * Adds or updates an element with a specified key and value.
+   * @template {MapType} VAL
    *
    * @param {string} key The key of the element to add to this YMap
-   * @param {MapType} value The value of the element to add
+   * @param {VAL} value The value of the element to add
+   * @return {VAL}
    */
   set (key, value) {
     if (this.doc !== null) {

src/types/YText.js

@@ -476,6 +476,56 @@ export const cleanupYTextFormatting = type => {
   return res
 }
 
+/**
+ * This will be called by the transction once the event handlers are called to potentially cleanup
+ * formatting attributes.
+ *
+ * @param {Transaction} transaction
+ */
+export const cleanupYTextAfterTransaction = transaction => {
+  /**
+   * @type {Set<YText>}
+   */
+  const needFullCleanup = new Set()
+  // check if another formatting item was inserted
+  const doc = transaction.doc
+  for (const [client, afterClock] of transaction.afterState.entries()) {
+    const clock = transaction.beforeState.get(client) || 0
+    if (afterClock === clock) {
+      continue
+    }
+    iterateStructs(transaction, /** @type {Array<Item|GC>} */ (doc.store.clients.get(client)), clock, afterClock, item => {
+      if (
+        !item.deleted && /** @type {Item} */ (item).content.constructor === ContentFormat && item.constructor !== GC
+      ) {
+        needFullCleanup.add(/** @type {any} */ (item).parent)
+      }
+    })
+  }
+  // cleanup in a new transaction
+  transact(doc, (t) => {
+    iterateDeletedStructs(transaction, transaction.deleteSet, item => {
+      if (item instanceof GC || needFullCleanup.has(/** @type {YText} */ (item.parent))) {
+        return
+      }
+      const parent = /** @type {YText} */ (item.parent)
+      if (item.content.constructor === ContentFormat) {
+        needFullCleanup.add(parent)
+      } else {
+        // If no formatting attribute was inserted or deleted, we can make due with contextless
+        // formatting cleanups.
+        // Contextless: it is not necessary to compute currentAttributes for the affected position.
+        cleanupContextlessFormattingGap(t, item)
+      }
+    })
+    // If a formatting item was inserted, we simply clean the whole type.
+    // We need to compute currentAttributes for the current position anyway.
+    for (const yText of needFullCleanup) {
+      cleanupYTextFormatting(yText)
+    }
+  })
+}
+
 /**
  * @param {Transaction} transaction
  * @param {ItemTextListPosition} currPos
@@ -631,36 +681,39 @@ export class YTextEvent extends YEvent {
             /**
              * @type {any}
              */
-            let op
+            let op = null
             switch (action) {
               case 'delete':
-                op = { delete: deleteLen }
+                if (deleteLen > 0) {
+                  op = { delete: deleteLen }
+                }
                 deleteLen = 0
                 break
               case 'insert':
-                op = { insert }
+                if (typeof insert === 'object' || insert.length > 0) {
-                if (currentAttributes.size > 0) {
+                  op = { insert }
-                  op.attributes = {}
+                  if (currentAttributes.size > 0) {
-                  currentAttributes.forEach((value, key) => {
+                    op.attributes = {}
-                    if (value !== null) {
+                    currentAttributes.forEach((value, key) => {
-                      op.attributes[key] = value
+                      if (value !== null) {
-                    }
+                        op.attributes[key] = value
-                  })
+                      }
+                    })
+                  }
                 }
                 insert = ''
                 break
               case 'retain':
-                op = { retain }
+                if (retain > 0) {
-                if (Object.keys(attributes).length > 0) {
+                  op = { retain }
-                  op.attributes = {}
+                  if (!object.isEmpty(attributes)) {
-                  for (const key in attributes) {
+                    op.attributes = object.assign({}, attributes)
-                    op.attributes[key] = attributes[key]
                   }
                 }
                 retain = 0
                 break
             }
-            delta.push(op)
+            if (op) delta.push(op)
             action = null
           }
         }
@@ -856,55 +909,10 @@ export class YText extends AbstractType {
   _callObserver (transaction, parentSubs) {
     super._callObserver(transaction, parentSubs)
     const event = new YTextEvent(this, transaction, parentSubs)
-    const doc = transaction.doc
     callTypeObservers(this, transaction, event)
     // If a remote change happened, we try to cleanup potential formatting duplicates.
     if (!transaction.local) {
-      // check if another formatting item was inserted
+      transaction._needFormattingCleanup = true
-      let foundFormattingItem = false
-      for (const [client, afterClock] of transaction.afterState.entries()) {
-        const clock = transaction.beforeState.get(client) || 0
-        if (afterClock === clock) {
-          continue
-        }
-        iterateStructs(transaction, /** @type {Array<Item|GC>} */ (doc.store.clients.get(client)), clock, afterClock, item => {
-          if (!item.deleted && /** @type {Item} */ (item).content.constructor === ContentFormat) {
-            foundFormattingItem = true
-          }
-        })
-        if (foundFormattingItem) {
-          break
-        }
-      }
-      if (!foundFormattingItem) {
-        iterateDeletedStructs(transaction, transaction.deleteSet, item => {
-          if (item instanceof GC || foundFormattingItem) {
-            return
-          }
-          if (item.parent === this && item.content.constructor === ContentFormat) {
-            foundFormattingItem = true
-          }
-        })
-      }
-      transact(doc, (t) => {
-        if (foundFormattingItem) {
-          // If a formatting item was inserted, we simply clean the whole type.
-          // We need to compute currentAttributes for the current position anyway.
-          cleanupYTextFormatting(this)
-        } else {
-          // If no formatting attribute was inserted, we can make due with contextless
-          // formatting cleanups.
-          // Contextless: it is not necessary to compute currentAttributes for the affected position.
-          iterateDeletedStructs(t, t.deleteSet, item => {
-            if (item instanceof GC) {
-              return
-            }
-            if (item.parent === this) {
-              cleanupContextlessFormattingGap(t, item)
-            }
-          })
-        }
-      })
     }
   }
 

src/types/YXmlElement.js

@@ -1,3 +1,4 @@
+import * as object from 'lib0/object'
 
 import {
   YXmlFragment,
@@ -12,12 +13,18 @@ import {
   YXmlText, ContentType, AbstractType, UpdateDecoderV1, UpdateDecoderV2, UpdateEncoderV1, UpdateEncoderV2, Doc, Item // eslint-disable-line
 } from '../internals.js'
 
+/**
+ * @typedef {Object|number|null|Array<any>|string|Uint8Array|AbstractType<any>} ValueTypes
+ */
+
 /**
  * An YXmlElement imitates the behavior of a
  * {@link https://developer.mozilla.org/en-US/docs/Web/API/Element|Dom Element}.
  *
  * * An YXmlElement has attributes (key value pairs)
  * * An YXmlElement has childElements that must inherit from YXmlElement
+ *
+ * @template {{ [key: string]: ValueTypes }} [KV={ [key: string]: string }]
  */
 export class YXmlElement extends YXmlFragment {
   constructor (nodeName = 'UNDEFINED') {
@@ -73,14 +80,19 @@ export class YXmlElement extends YXmlFragment {
   }
 
   /**
-   * @return {YXmlElement}
+   * @return {YXmlElement<KV>}
    */
   clone () {
+    /**
+     * @type {YXmlElement<KV>}
+     */
     const el = new YXmlElement(this.nodeName)
     const attrs = this.getAttributes()
-    for (const key in attrs) {
+    object.forEach(attrs, (value, key) => {
-      el.setAttribute(key, attrs[key])
+      if (typeof value === 'string') {
-    }
+        el.setAttribute(key, value)
+      }
+    })
     // @ts-ignore
     el.insert(0, this.toArray().map(item => item instanceof AbstractType ? item.clone() : item))
     return el
@@ -116,7 +128,7 @@ export class YXmlElement extends YXmlFragment {
   /**
    * Removes an attribute from this YXmlElement.
    *
-   * @param {String} attributeName The attribute name that is to be removed.
+   * @param {string} attributeName The attribute name that is to be removed.
    *
    * @public
    */
@@ -133,8 +145,10 @@ export class YXmlElement extends YXmlFragment {
   /**
    * Sets or updates an attribute.
    *
-   * @param {String} attributeName The attribute name that is to be set.
+   * @template {keyof KV & string} KEY
-   * @param {String} attributeValue The attribute value that is to be set.
+   *
+   * @param {KEY} attributeName The attribute name that is to be set.
+   * @param {KV[KEY]} attributeValue The attribute value that is to be set.
    *
    * @public
    */
@@ -151,9 +165,11 @@ export class YXmlElement extends YXmlFragment {
   /**
    * Returns an attribute value that belongs to the attribute name.
    *
-   * @param {String} attributeName The attribute name that identifies the
+   * @template {keyof KV & string} KEY
+   *
+   * @param {KEY} attributeName The attribute name that identifies the
    *                               queried value.
-   * @return {String} The queried attribute value.
+   * @return {KV[KEY]|undefined} The queried attribute value.
    *
    * @public
    */
@@ -164,7 +180,7 @@ export class YXmlElement extends YXmlFragment {
   /**
    * Returns whether an attribute exists
    *
-   * @param {String} attributeName The attribute name to check for existence.
+   * @param {string} attributeName The attribute name to check for existence.
    * @return {boolean} whether the attribute exists.
    *
    * @public
@@ -176,12 +192,12 @@ export class YXmlElement extends YXmlFragment {
   /**
    * Returns all attribute name/value pairs in a JSON Object.
    *
-   * @return {Object<string, any>} A JSON Object that describes the attributes.
+   * @return {{ [Key in Extract<keyof KV,string>]?: KV[Key]}} A JSON Object that describes the attributes.
    *
    * @public
    */
   getAttributes () {
-    return typeMapGetAll(this)
+    return /** @type {any} */ (typeMapGetAll(this))
   }
 
   /**
@@ -203,7 +219,10 @@ export class YXmlElement extends YXmlFragment {
     const dom = _document.createElement(this.nodeName)
     const attrs = this.getAttributes()
     for (const key in attrs) {
-      dom.setAttribute(key, attrs[key])
+      const value = attrs[key]
+      if (typeof value === 'string') {
+        dom.setAttribute(key, value)
+      }
     }
     typeListForEach(this, yxml => {
       dom.appendChild(yxml.toDOM(_document, hooks, binding))

src/utils/DeleteSet.js

@@ -328,3 +328,23 @@ export const readAndApplyDeleteSet = (decoder, transaction, store) => {
   }
   return null
 }
+
+/**
+ * @param {DeleteSet} ds1
+ * @param {DeleteSet} ds2
+ */
+export const equalDeleteSets = (ds1, ds2) => {
+  if (ds1.clients.size !== ds2.clients.size) return false
+  ds1.clients.forEach((deleteItems1, client) => {
+    const deleteItems2 = /** @type {Array<import('../internals.js').DeleteItem>} */ (ds2.clients.get(client))
+    if (deleteItems2 === undefined || deleteItems1.length !== deleteItems2.length) return false
+    for (let i = 0; i < deleteItems1.length; i++) {
+      const di1 = deleteItems1[i]
+      const di2 = deleteItems2[i]
+      if (di1.clock !== di2.clock || di1.len !== di2.len) {
+        return false
+      }
+    }
+  })
+  return true
+}

src/utils/Snapshot.js

@@ -15,7 +15,10 @@ import {
   findIndexSS,
   UpdateEncoderV2,
   applyUpdateV2,
-  DSEncoderV1, DSEncoderV2, DSDecoderV1, DSDecoderV2, Transaction, Doc, DeleteSet, Item // eslint-disable-line
+  LazyStructReader,
+  equalDeleteSets,
+  UpdateDecoderV1, UpdateDecoderV2, DSEncoderV1, DSEncoderV2, DSDecoderV1, DSDecoderV2, Transaction, Doc, DeleteSet, Item, // eslint-disable-line
+  mergeDeleteSets
 } from '../internals.js'
 
 import * as map from 'lib0/map'
@@ -147,12 +150,20 @@ export const splitSnapshotAffectedStructs = (transaction, snapshot) => {
         getItemCleanStart(transaction, createID(client, clock))
       }
     })
-    iterateDeletedStructs(transaction, snapshot.ds, item => {})
+    iterateDeletedStructs(transaction, snapshot.ds, _item => {})
     meta.add(snapshot)
   }
 }
 
 /**
+ * @example
+ *  const ydoc = new Y.Doc({ gc: false })
+ *  ydoc.getText().insert(0, 'world!')
+ *  const snapshot = Y.snapshot(ydoc)
+ *  ydoc.getText().insert(0, 'hello ')
+ *  const restored = Y.createDocFromSnapshot(ydoc, snapshot)
+ *  assert(restored.getText().toString() === 'world!')
+ *
  * @param {Doc} originDoc
  * @param {Snapshot} snapshot
  * @param {Doc} [newDoc] Optionally, you may define the Yjs document that receives the data from originDoc
@@ -161,7 +172,7 @@ export const splitSnapshotAffectedStructs = (transaction, snapshot) => {
 export const createDocFromSnapshot = (originDoc, snapshot, newDoc = new Doc()) => {
   if (originDoc.gc) {
     // we should not try to restore a GC-ed document, because some of the restored items might have their content deleted
-    throw new Error('originDoc must not be garbage collected')
+    throw new Error('Garbage-collection must be disabled in `originDoc`!')
   }
   const { sv, ds } = snapshot
 
@@ -199,3 +210,28 @@ export const createDocFromSnapshot = (originDoc, snapshot, newDoc = new Doc()) =
   applyUpdateV2(newDoc, encoder.toUint8Array(), 'snapshot')
   return newDoc
 }
+
+/**
+ * @param {Snapshot} snapshot
+ * @param {Uint8Array} update
+ * @param {typeof UpdateDecoderV2 | typeof UpdateDecoderV1} [YDecoder]
+ */
+export const snapshotContainsUpdateV2 = (snapshot, update, YDecoder = UpdateDecoderV2) => {
+  const structs = []
+  const updateDecoder = new YDecoder(decoding.createDecoder(update))
+  const lazyDecoder = new LazyStructReader(updateDecoder, false)
+  for (let curr = lazyDecoder.curr; curr !== null; curr = lazyDecoder.next()) {
+    structs.push(curr)
+    if ((snapshot.sv.get(curr.id.client) || 0) < curr.id.clock + curr.length) {
+      return false
+    }
+  }
+  const mergedDS = mergeDeleteSets([snapshot.ds, readDeleteSet(updateDecoder)])
+  return equalDeleteSets(snapshot.ds, mergedDS)
+}
+
+/**
+ * @param {Snapshot} snapshot
+ * @param {Uint8Array} update
+ */
+export const snapshotContainsUpdate = (snapshot, update) => snapshotContainsUpdateV2(snapshot, update, UpdateDecoderV1)

src/utils/Transaction.js

@@ -11,6 +11,7 @@ import {
   Item,
   generateNewClientId,
   createID,
+  cleanupYTextAfterTransaction,
   UpdateEncoderV1, UpdateEncoderV2, GC, StructStore, AbstractType, AbstractStruct, YEvent, Doc // eslint-disable-line
 } from '../internals.js'
 
@@ -114,6 +115,10 @@ export class Transaction {
      * @type {Set<Doc>}
      */
     this.subdocsLoaded = new Set()
+    /**
+     * @type {boolean}
+     */
+    this._needFormattingCleanup = false
   }
 }
 
@@ -295,6 +300,9 @@ const cleanupTransactions = (transactionCleanups, i) => {
         fs.push(() => doc.emit('afterTransaction', [transaction, doc]))
       })
       callAll(fs, [])
+      if (transaction._needFormattingCleanup) {
+        cleanupYTextAfterTransaction(transaction)
+      }
     } finally {
       // Replace deleted items with ItemDeleted / GC.
       // This is where content is actually remove from the Yjs Doc.

src/utils/encoding.js

@@ -88,7 +88,7 @@ export const writeClientsStructs = (encoder, store, _sm) => {
       sm.set(client, clock)
     }
   })
-  getStateVector(store).forEach((clock, client) => {
+  getStateVector(store).forEach((_clock, client) => {
     if (!_sm.has(client)) {
       sm.set(client, 0)
     }
@@ -98,8 +98,7 @@ export const writeClientsStructs = (encoder, store, _sm) => {
   // Write items with higher client ids first
   // This heavily improves the conflict algorithm.
   array.from(sm.entries()).sort((a, b) => b[0] - a[0]).forEach(([client, clock]) => {
-    // @ts-ignore
+    writeStructs(encoder, /** @type {Array<GC|Item>} */ (store.clients.get(client)), client, clock)
-    writeStructs(encoder, store.clients.get(client), client, clock)
   })
 }
 

src/utils/updates.js

@@ -2,19 +2,40 @@
 import * as binary from 'lib0/binary'
 import * as decoding from 'lib0/decoding'
 import * as encoding from 'lib0/encoding'
+import * as error from 'lib0/error'
+import * as f from 'lib0/function'
 import * as logging from 'lib0/logging'
+import * as map from 'lib0/map'
 import * as math from 'lib0/math'
+import * as string from 'lib0/string'
+
 import {
+  ContentAny,
+  ContentBinary,
+  ContentDeleted,
+  ContentDoc,
+  ContentEmbed,
+  ContentFormat,
+  ContentJSON,
+  ContentString,
+  ContentType,
   createID,
-  readItemContent,
+  decodeStateVector,
-  readDeleteSet,
-  writeDeleteSet,
-  Skip,
-  mergeDeleteSets,
   DSEncoderV1,
   DSEncoderV2,
-  decodeStateVector,
+  GC,
-  Item, GC, UpdateDecoderV1, UpdateDecoderV2, UpdateEncoderV1, UpdateEncoderV2 // eslint-disable-line
+  Item,
+  mergeDeleteSets,
+  readDeleteSet,
+  readItemContent,
+  Skip,
+  UpdateDecoderV1,
+  UpdateDecoderV2,
+  UpdateEncoderV1,
+  UpdateEncoderV2,
+  writeDeleteSet,
+  YXmlElement,
+  YXmlHook
 } from '../internals.js'
 
 /**
@@ -552,17 +573,17 @@ const finishLazyStructWriting = (lazyWriter) => {
 
 /**
  * @param {Uint8Array} update
+ * @param {function(Item|GC|Skip):Item|GC|Skip} blockTransformer
  * @param {typeof UpdateDecoderV2 | typeof UpdateDecoderV1} YDecoder
  * @param {typeof UpdateEncoderV2 | typeof UpdateEncoderV1 } YEncoder
  */
-export const convertUpdateFormat = (update, YDecoder, YEncoder) => {
+export const convertUpdateFormat = (update, blockTransformer, YDecoder, YEncoder) => {
   const updateDecoder = new YDecoder(decoding.createDecoder(update))
   const lazyDecoder = new LazyStructReader(updateDecoder, false)
   const updateEncoder = new YEncoder()
   const lazyWriter = new LazyStructWriter(updateEncoder)
-
   for (let curr = lazyDecoder.curr; curr !== null; curr = lazyDecoder.next()) {
-    writeStructToLazyStructWriter(lazyWriter, curr, 0)
+    writeStructToLazyStructWriter(lazyWriter, blockTransformer(curr), 0)
   }
   finishLazyStructWriting(lazyWriter)
   const ds = readDeleteSet(updateDecoder)
@@ -571,11 +592,132 @@ export const convertUpdateFormat = (update, YDecoder, YEncoder) => {
 }
 
 /**
- * @param {Uint8Array} update
+ * @typedef {Object} ObfuscatorOptions
+ * @property {boolean} [ObfuscatorOptions.formatting=true]
+ * @property {boolean} [ObfuscatorOptions.subdocs=true]
+ * @property {boolean} [ObfuscatorOptions.yxml=true] Whether to obfuscate nodeName / hookName
  */
-export const convertUpdateFormatV1ToV2 = update => convertUpdateFormat(update, UpdateDecoderV1, UpdateEncoderV2)
+
+/**
+ * @param {ObfuscatorOptions} obfuscator
+ */
+const createObfuscator = ({ formatting = true, subdocs = true, yxml = true } = {}) => {
+  let i = 0
+  const mapKeyCache = map.create()
+  const nodeNameCache = map.create()
+  const formattingKeyCache = map.create()
+  const formattingValueCache = map.create()
+  formattingValueCache.set(null, null) // end of a formatting range should always be the end of a formatting range
+  /**
+   * @param {Item|GC|Skip} block
+   * @return {Item|GC|Skip}
+   */
+  return block => {
+    switch (block.constructor) {
+      case GC:
+      case Skip:
+        return block
+      case Item: {
+        const item = /** @type {Item} */ (block)
+        const content = item.content
+        switch (content.constructor) {
+          case ContentDeleted:
+            break
+          case ContentType: {
+            if (yxml) {
+              const type = /** @type {ContentType} */ (content).type
+              if (type instanceof YXmlElement) {
+                type.nodeName = map.setIfUndefined(nodeNameCache, type.nodeName, () => 'node-' + i)
+              }
+              if (type instanceof YXmlHook) {
+                type.hookName = map.setIfUndefined(nodeNameCache, type.hookName, () => 'hook-' + i)
+              }
+            }
+            break
+          }
+          case ContentAny: {
+            const c = /** @type {ContentAny} */ (content)
+            c.arr = c.arr.map(() => i)
+            break
+          }
+          case ContentBinary: {
+            const c = /** @type {ContentBinary} */ (content)
+            c.content = new Uint8Array([i])
+            break
+          }
+          case ContentDoc: {
+            const c = /** @type {ContentDoc} */ (content)
+            if (subdocs) {
+              c.opts = {}
+              c.doc.guid = i + ''
+            }
+            break
+          }
+          case ContentEmbed: {
+            const c = /** @type {ContentEmbed} */ (content)
+            c.embed = {}
+            break
+          }
+          case ContentFormat: {
+            const c = /** @type {ContentFormat} */ (content)
+            if (formatting) {
+              c.key = map.setIfUndefined(formattingKeyCache, c.key, () => i + '')
+              c.value = map.setIfUndefined(formattingValueCache, c.value, () => ({ i }))
+            }
+            break
+          }
+          case ContentJSON: {
+            const c = /** @type {ContentJSON} */ (content)
+            c.arr = c.arr.map(() => i)
+            break
+          }
+          case ContentString: {
+            const c = /** @type {ContentString} */ (content)
+            c.str = string.repeat((i % 10) + '', c.str.length)
+            break
+          }
+          default:
+            // unknown content type
+            error.unexpectedCase()
+        }
+        if (item.parentSub) {
+          item.parentSub = map.setIfUndefined(mapKeyCache, item.parentSub, () => i + '')
+        }
+        i++
+        return block
+      }
+      default:
+        // unknown block-type
+        error.unexpectedCase()
+    }
+  }
+}
+
+/**
+ * This function obfuscates the content of a Yjs update. This is useful to share
+ * buggy Yjs documents while significantly limiting the possibility that a
+ * developer can on the user. Note that it might still be possible to deduce
+ * some information by analyzing the "structure" of the document or by analyzing
+ * the typing behavior using the CRDT-related metadata that is still kept fully
+ * intact.
+ *
+ * @param {Uint8Array} update
+ * @param {ObfuscatorOptions} [opts]
+ */
+export const obfuscateUpdate = (update, opts) => convertUpdateFormat(update, createObfuscator(opts), UpdateDecoderV1, UpdateEncoderV1)
+
+/**
+ * @param {Uint8Array} update
+ * @param {ObfuscatorOptions} [opts]
+ */
+export const obfuscateUpdateV2 = (update, opts) => convertUpdateFormat(update, createObfuscator(opts), UpdateDecoderV2, UpdateEncoderV2)
 
 /**
  * @param {Uint8Array} update
  */
-export const convertUpdateFormatV2ToV1 = update => convertUpdateFormat(update, UpdateDecoderV2, UpdateEncoderV1)
+export const convertUpdateFormatV1ToV2 = update => convertUpdateFormat(update, f.id, UpdateDecoderV1, UpdateEncoderV2)
+
+/**
+ * @param {Uint8Array} update
+ */
+export const convertUpdateFormatV2ToV1 = update => convertUpdateFormat(update, f.id, UpdateDecoderV2, UpdateEncoderV1)

tests/snapshot.tests.js

@@ -3,9 +3,21 @@ import * as t from 'lib0/testing'
 import { init } from './testHelper.js'
 
 /**
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testBasicRestoreSnapshot = tc => {
+export const testBasic = _tc => {
+  const ydoc = new Y.Doc({ gc: false })
+  ydoc.getText().insert(0, 'world!')
+  const snapshot = Y.snapshot(ydoc)
+  ydoc.getText().insert(0, 'hello ')
+  const restored = Y.createDocFromSnapshot(ydoc, snapshot)
+  t.assert(restored.getText().toString() === 'world!')
+}
+
+/**
+ * @param {t.TestCase} _tc
+ */
+export const testBasicRestoreSnapshot = _tc => {
   const doc = new Y.Doc({ gc: false })
   doc.getArray('array').insert(0, ['hello'])
   const snap = Y.snapshot(doc)
@@ -18,9 +30,9 @@ export const testBasicRestoreSnapshot = tc => {
 }
 
 /**
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testEmptyRestoreSnapshot = tc => {
+export const testEmptyRestoreSnapshot = _tc => {
   const doc = new Y.Doc({ gc: false })
   const snap = Y.snapshot(doc)
   snap.sv.set(9999, 0)
@@ -38,9 +50,9 @@ export const testEmptyRestoreSnapshot = tc => {
 }
 
 /**
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testRestoreSnapshotWithSubType = tc => {
+export const testRestoreSnapshotWithSubType = _tc => {
   const doc = new Y.Doc({ gc: false })
   doc.getArray('array').insert(0, [new Y.Map()])
   const subMap = doc.getArray('array').get(0)
@@ -61,9 +73,9 @@ export const testRestoreSnapshotWithSubType = tc => {
 }
 
 /**
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testRestoreDeletedItem1 = tc => {
+export const testRestoreDeletedItem1 = _tc => {
   const doc = new Y.Doc({ gc: false })
   doc.getArray('array').insert(0, ['item1', 'item2'])
 
@@ -77,9 +89,9 @@ export const testRestoreDeletedItem1 = tc => {
 }
 
 /**
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testRestoreLeftItem = tc => {
+export const testRestoreLeftItem = _tc => {
   const doc = new Y.Doc({ gc: false })
   doc.getArray('array').insert(0, ['item1'])
   doc.getMap('map').set('test', 1)
@@ -95,9 +107,9 @@ export const testRestoreLeftItem = tc => {
 }
 
 /**
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testDeletedItemsBase = tc => {
+export const testDeletedItemsBase = _tc => {
   const doc = new Y.Doc({ gc: false })
   doc.getArray('array').insert(0, ['item1'])
   doc.getArray('array').delete(0)
@@ -111,9 +123,9 @@ export const testDeletedItemsBase = tc => {
 }
 
 /**
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testDeletedItems2 = tc => {
+export const testDeletedItems2 = _tc => {
   const doc = new Y.Doc({ gc: false })
   doc.getArray('array').insert(0, ['item1', 'item2', 'item3'])
   doc.getArray('array').delete(1)
@@ -169,3 +181,28 @@ export const testDependentChanges = tc => {
   const docRestored1 = Y.createDocFromSnapshot(array1.doc, snap)
   t.compare(docRestored1.getArray('array').toArray(), ['user1item1', 'user2item1'])
 }
+
+/**
+ * @param {t.TestCase} _tc
+ */
+export const testContainsUpdate = _tc => {
+  const ydoc = new Y.Doc()
+  /**
+   * @type {Array<Uint8Array>}
+   */
+  const updates = []
+  ydoc.on('update', update => {
+    updates.push(update)
+  })
+  const yarr = ydoc.getArray()
+  const snapshot1 = Y.snapshot(ydoc)
+  yarr.insert(0, [1])
+  const snapshot2 = Y.snapshot(ydoc)
+  yarr.delete(0, 1)
+  const snapshotFinal = Y.snapshot(ydoc)
+  t.assert(!Y.snapshotContainsUpdate(snapshot1, updates[0]))
+  t.assert(!Y.snapshotContainsUpdate(snapshot2, updates[1]))
+  t.assert(Y.snapshotContainsUpdate(snapshot2, updates[0]))
+  t.assert(Y.snapshotContainsUpdate(snapshotFinal, updates[0]))
+  t.assert(Y.snapshotContainsUpdate(snapshotFinal, updates[1]))
+}

tests/testHelper.js

@@ -356,8 +356,9 @@ export const compare = users => {
       return true
     })
     t.compare(Y.encodeStateVector(users[i]), Y.encodeStateVector(users[i + 1]))
-    compareDS(Y.createDeleteSetFromStructStore(users[i].store), Y.createDeleteSetFromStructStore(users[i + 1].store))
+    Y.equalDeleteSets(Y.createDeleteSetFromStructStore(users[i].store), Y.createDeleteSetFromStructStore(users[i + 1].store))
     compareStructStores(users[i].store, users[i + 1].store)
+    t.compare(Y.encodeSnapshot(Y.snapshot(users[i])), Y.encodeSnapshot(Y.snapshot(users[i + 1])))
   }
   users.map(u => u.destroy())
 }
@@ -412,25 +413,6 @@ export const compareStructStores = (ss1, ss2) => {
   }
 }
 
-/**
- * @param {import('../src/internals.js').DeleteSet} ds1
- * @param {import('../src/internals.js').DeleteSet} ds2
- */
-export const compareDS = (ds1, ds2) => {
-  t.assert(ds1.clients.size === ds2.clients.size)
-  ds1.clients.forEach((deleteItems1, client) => {
-    const deleteItems2 = /** @type {Array<import('../src/internals.js').DeleteItem>} */ (ds2.clients.get(client))
-    t.assert(deleteItems2 !== undefined && deleteItems1.length === deleteItems2.length)
-    for (let i = 0; i < deleteItems1.length; i++) {
-      const di1 = deleteItems1[i]
-      const di2 = deleteItems2[i]
-      if (di1.clock !== di2.clock || di1.len !== di2.len) {
-        t.fail('DeleteSets dont match')
-      }
-    }
-  })
-}
-
 /**
  * @template T
  * @callback InitTestObjectCallback

tests/updates.tests.js

@@ -4,6 +4,7 @@ import * as Y from '../src/index.js'
 import { readClientsStructRefs, readDeleteSet, UpdateDecoderV2, UpdateEncoderV2, writeDeleteSet } from '../src/internals.js'
 import * as encoding from 'lib0/encoding'
 import * as decoding from 'lib0/decoding'
+import * as object from 'lib0/object'
 
 /**
  * @typedef {Object} Enc
@@ -138,7 +139,6 @@ export const testKeyEncoding = tc => {
  */
 const checkUpdateCases = (ydoc, updates, enc, hasDeletes) => {
   const cases = []
-
   // Case 1: Simple case, simply merge everything
   cases.push(enc.mergeUpdates(updates))
 
@@ -304,3 +304,54 @@ export const testMergePendingUpdates = tc => {
   const yText5 = yDoc5.getText('textBlock')
   t.compareStrings(yText5.toString(), 'nenor')
 }
+
+/**
+ * @param {t.TestCase} tc
+ */
+export const testObfuscateUpdates = tc => {
+  const ydoc = new Y.Doc()
+  const ytext = ydoc.getText('text')
+  const ymap = ydoc.getMap('map')
+  const yarray = ydoc.getArray('array')
+  // test ytext
+  ytext.applyDelta([{ insert: 'text', attributes: { bold: true } }, { insert: { href: 'supersecreturl' } }])
+  // test ymap
+  ymap.set('key', 'secret1')
+  ymap.set('key', 'secret2')
+  // test yarray with subtype & subdoc
+  const subtype = new Y.XmlElement('secretnodename')
+  const subdoc = new Y.Doc({ guid: 'secret' })
+  subtype.setAttribute('attr', 'val')
+  yarray.insert(0, ['teststring', 42, subtype, subdoc])
+  // obfuscate the content and put it into a new document
+  const obfuscatedUpdate = Y.obfuscateUpdate(Y.encodeStateAsUpdate(ydoc))
+  const odoc = new Y.Doc()
+  Y.applyUpdate(odoc, obfuscatedUpdate)
+  const otext = odoc.getText('text')
+  const omap = odoc.getMap('map')
+  const oarray = odoc.getArray('array')
+  // test ytext
+  const delta = otext.toDelta()
+  t.assert(delta.length === 2)
+  t.assert(delta[0].insert !== 'text' && delta[0].insert.length === 4)
+  t.assert(object.length(delta[0].attributes) === 1)
+  t.assert(!object.hasProperty(delta[0].attributes, 'bold'))
+  t.assert(object.length(delta[1]) === 1)
+  t.assert(object.hasProperty(delta[1], 'insert'))
+  // test ymap
+  t.assert(omap.size === 1)
+  t.assert(!omap.has('key'))
+  // test yarray with subtype & subdoc
+  const result = oarray.toArray()
+  t.assert(result.length === 4)
+  t.assert(result[0] !== 'teststring')
+  t.assert(result[1] !== 42)
+  const osubtype = /** @type {Y.XmlElement} */ (result[2])
+  const osubdoc = result[3]
+  // test subtype
+  t.assert(osubtype.nodeName !== subtype.nodeName)
+  t.assert(object.length(osubtype.getAttributes()) === 1)
+  t.assert(osubtype.getAttribute('attr') === undefined)
+  // test subdoc
+  t.assert(osubdoc.guid !== subdoc.guid)
+}

tests/y-xml.tests.js

@@ -3,6 +3,33 @@ import * as Y from '../src/index.js'
 
 import * as t from 'lib0/testing'
 
+export const testCustomTypings = () => {
+  const ydoc = new Y.Doc()
+  const ymap = ydoc.getMap()
+  /**
+   * @type {Y.XmlElement<{ num: number, str: string, [k:string]: object|number|string }>}
+   */
+  const yxml = ymap.set('yxml', new Y.XmlElement('test'))
+  /**
+   * @type {number|undefined}
+   */
+  const num = yxml.getAttribute('num')
+  /**
+   * @type {string|undefined}
+   */
+  const str = yxml.getAttribute('str')
+  /**
+   * @type {object|number|string|undefined}
+   */
+  const dtrn = yxml.getAttribute('dtrn')
+  const attrs = yxml.getAttributes()
+  /**
+   * @type {object|number|string|undefined}
+   */
+  const any = attrs.shouldBeAny
+  console.log({ num, str, dtrn, attrs, any })
+}
+
 /**
  * @param {t.TestCase} tc
  */
@@ -92,9 +119,9 @@ export const testTreewalker = tc => {
 }
 
 /**
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testYtextAttributes = tc => {
+export const testYtextAttributes = _tc => {
   const ydoc = new Y.Doc()
   const ytext = /** @type {Y.XmlText} */ (ydoc.get('', Y.XmlText))
   ytext.observe(event => {
@@ -106,9 +133,9 @@ export const testYtextAttributes = tc => {
 }
 
 /**
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testSiblings = tc => {
+export const testSiblings = _tc => {
   const ydoc = new Y.Doc()
   const yxml = ydoc.getXmlFragment()
   const first = new Y.XmlText()
@@ -122,9 +149,9 @@ export const testSiblings = tc => {
 }
 
 /**
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testInsertafter = tc => {
+export const testInsertafter = _tc => {
   const ydoc = new Y.Doc()
   const yxml = ydoc.getXmlFragment()
   const first = new Y.XmlText()
@@ -152,9 +179,9 @@ export const testInsertafter = tc => {
 }
 
 /**
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testClone = tc => {
+export const testClone = _tc => {
   const ydoc = new Y.Doc()
   const yxml = ydoc.getXmlFragment()
   const first = new Y.XmlText('text')
@@ -170,9 +197,9 @@ export const testClone = tc => {
 }
 
 /**
- * @param {t.TestCase} tc
+ * @param {t.TestCase} _tc
  */
-export const testFormattingBug = tc => {
+export const testFormattingBug = _tc => {
   const ydoc = new Y.Doc()
   const yxml = /** @type {Y.XmlText} */ (ydoc.get('', Y.XmlText))
   const delta = [