fix: harden Protobuf Deserialization and Refactor Utilities (#1820)

* refactor: reorganize browser utility functions and improve buffer handling

* fix: harden protobuf deserialization and clean up code

* refactor: simplify data handling in GroupCipher and SenderKey classes

* fix: Ensure consistent Buffer hydration and remove redundant code

* refactor: update decodeAndHydrate calls to use proto types for improved type safety

src/Utils/chat-utils.ts

@@ -25,6 +25,7 @@ import { toNumber } from './generics'
 import type { ILogger } from './logger'
 import { LT_HASH_ANTI_TAMPERING } from './lt-hash'
 import { downloadContentFromMessage } from './messages-media'
+import { decodeAndHydrate } from './proto-utils'
 
 type FetchAppStateSyncKey = (keyId: string) => Promise<proto.Message.IAppStateSyncKeyData | null | undefined>
 
@@ -233,7 +234,7 @@ export const decodeSyncdMutations = async (
 		}
 
 		const result = aesDecrypt(encContent, key.valueEncryptionKey)
-		const syncAction = proto.SyncActionData.decode(result)
+		const syncAction = decodeAndHydrate(proto.SyncActionData, result)
 
 		if (validateMacs) {
 			const hmac = hmacSign(syncAction.index, key.indexKey)
@@ -327,9 +328,9 @@ export const extractSyncdPatches = async (result: BinaryNode, options: AxiosRequ
 					snapshotNode.content = Buffer.from(Object.values(snapshotNode.content))
 				}
 
-				const blobRef = proto.ExternalBlobReference.decode(snapshotNode.content as Buffer)
+				const blobRef = decodeAndHydrate(proto.ExternalBlobReference, snapshotNode.content as Buffer)
 				const data = await downloadExternalBlob(blobRef, options)
-				snapshot = proto.SyncdSnapshot.decode(data)
+				snapshot = decodeAndHydrate(proto.SyncdSnapshot, data)
 			}
 
 			for (let { content } of patches) {
@@ -338,7 +339,7 @@ export const extractSyncdPatches = async (result: BinaryNode, options: AxiosRequ
 						content = Buffer.from(Object.values(content))
 					}
 
-					const syncd = proto.SyncdPatch.decode(content as Uint8Array)
+					const syncd = decodeAndHydrate(proto.SyncdPatch, content as Uint8Array)
 					if (!syncd.version) {
 						syncd.version = { version: +collectionNode.attrs.version! + 1 }
 					}
@@ -366,7 +367,7 @@ export const downloadExternalBlob = async (blob: proto.IExternalBlobReference, o
 
 export const downloadExternalPatch = async (blob: proto.IExternalBlobReference, options: AxiosRequestConfig<{}>) => {
 	const buffer = await downloadExternalBlob(blob, options)
-	const syncData = proto.SyncdMutations.decode(buffer)
+	const syncData = decodeAndHydrate(proto.SyncdMutations, buffer)
 	return syncData
 }