From 8ac16feabacc8cf7e5d58251ddcb813e87c06638 Mon Sep 17 00:00:00 2001
From: Sergej Sakac <sakacszergej@gmail.com>
Date: Tue, 12 Sep 2023 10:13:50 +0200
Subject: [PATCH] Additional checks when transferring

---
 src/consts/index.ts    |  4 ++--
 src/pages/transfer.tsx | 31 +++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/src/consts/index.ts b/src/consts/index.ts
index 50f1cbe..8cb52b8 100644
--- a/src/consts/index.ts
+++ b/src/consts/index.ts
@@ -1,7 +1,7 @@
 export type RELAY_CHAIN_OPTION = 'polkadot' | 'kusama';
 const RELAY_CHAIN_ENDPOINTS = {
-  polkadot: "wss://polkadot.api.onfinality.io/public-ws",
-  kusama: "wss://kusama.api.onfinality.io/public-ws"
+  polkadot: "wss://rpc.polkadot.io",
+  kusama: "wss://kusama-rpc.polkadot.io"
 };
 export const RELAY_CHAIN = (process.env.RELAY_CHAIN || 'polkadot') as RELAY_CHAIN_OPTION;
 export const RELAY_CHAIN_ENDPOINT = RELAY_CHAIN_ENDPOINTS[RELAY_CHAIN];
diff --git a/src/pages/transfer.tsx b/src/pages/transfer.tsx
index 6142a9e..957f2f2 100644
--- a/src/pages/transfer.tsx
+++ b/src/pages/transfer.tsx
@@ -236,6 +236,21 @@ const TransferPage = () => {
       return;
     }
 
+    if (amount === 0) {
+      toastError("Transfer amount must be greater than 0");
+      return;
+    }
+
+    if (Number.isNaN(amount)) {
+      toastError("Amount must be specified")
+      return;
+    }
+
+    if (countDecimalDigits(amount) > selectedAsset.decimals) {
+      toastError(`The asset can have only ${selectedAsset.decimals} decimals`);
+      return;
+    }
+
     if (sourceChainId === destChainId) {
       // Just do a simple token transfer.
       const api = await getApi(chains[sourceChainId].rpc);
@@ -316,6 +331,22 @@ const TransferPage = () => {
     setTransferring(false);
   };
 
+  const countDecimalDigits = (n: number): number => {
+    const numberStr = n.toString();
+
+    // Check for scientific notation
+    if (numberStr.includes('e')) {
+      const parts = numberStr.split('e');
+      const decimalPart = (parts[0].split('.')[1] || '').length;
+      const exponentPart = parseInt(parts[1], 10);
+      return decimalPart - exponentPart;
+    } else {
+      const decimalPart = (numberStr.split('.')[1] || '').length;
+      return decimalPart;
+    }
+  }
+
+
   const getParaIdFromXcmInterior = (xcmInterior: any): number => {
     if (xcmInterior.length > 1 && Object.hasOwn(xcmInterior[1], 'parachain')) {
       return xcmInterior[1].parachain;