sync block height validation

Author: irubido

packages/snap/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@chainsafe/webzjs-zcash-snap",
-  "version": "0.2.1",
+  "version": "0.2.2",
   "description": "Zcash Metmamask Snap that utilizes WebZjs.",
   "repository": {
     "type": "git",

packages/snap/snap.manifest.json

@@ -1,13 +1,13 @@
 {
-  "version": "0.2.1",
+  "version": "0.2.2",
   "description": "WebZjs Snap for demo wallet",
   "proposedName": "WebZjs Snap",
   "repository": {
     "type": "git",
     "url": "https://github.com/ChainSafe/WebZjs.git"
   },
   "source": {
-    "shasum": "qEgmDNiFc38+m/Ra1d5sOCSYmdAitT/Ghy6lVl21oDY=",
+    "shasum": "YsNLaFFSeBvE+cukvWF2qkh2PhTrCmU+H9gaEpVUr74=",
     "location": {
       "npm": {
         "filePath": "dist/bundle.js",

packages/snap/src/utils/setSyncBlockHeight.ts

@@ -5,12 +5,20 @@ export function setSyncBlockHeight(
   userInputCreationBlock: string | null,
   latestBlock: number,
 ): number {
+  //In case input was empty, default to latestBlock
   if (userInputCreationBlock === null) return latestBlock;
 
+  // Check if input is a valid number
+  if (!/^\d+$/.test(userInputCreationBlock)) return latestBlock;
+
   const customBirthdayBlock = Number(userInputCreationBlock);
 
+  // Check if custom block is higher than latest block
+  if (customBirthdayBlock > latestBlock) return latestBlock;
+
   const latestAcceptableSyncBlock = NU5_ACTIVATION;
 
+  //In case user entered older than acceptable block height
   return customBirthdayBlock > latestAcceptableSyncBlock
     ? customBirthdayBlock
     : latestAcceptableSyncBlock;