feat/fix: add fee checker

Author: danwag06

src/hooks/useBsv.ts

@@ -78,7 +78,7 @@ export const useBsv = () => {
       const amount = request.reduce((a, r) => a + r.satAmount, 0);
 
       // Format in and outs
-      const utxos = await getUtxos(fromAddress);
+      const utxos: WocUtxo[] = await getUtxos(fromAddress);
 
       const script = P2PKHAddress.from_string(fromAddress)
         .get_locking_script()
@@ -100,6 +100,7 @@ export const useBsv = () => {
         (a: number, item: UTXO) => a + item.satoshis,
         0
       );
+
       if (totalSats < amount) {
         return { error: "insufficient-funds" };
       }
@@ -132,9 +133,9 @@ export const useBsv = () => {
         );
       }
 
-      // build txins from our UTXOs
+      // build txins from our inputs
       let idx = 0;
-      for (let u of fundingUtxos || []) {
+      for (let u of inputs || []) {
         const inTx = new TxIn(
           Buffer.from(u.txid, "hex"),
           u.vout,
@@ -161,6 +162,13 @@ export const useBsv = () => {
         idx++;
       }
 
+      // Fee checker
+      const finalSatsIn = tx.satoshis_in() ?? 0n;
+      const finalSatsOut = tx.satoshis_out() ?? 0n;
+      if (finalSatsIn - finalSatsOut > 500) {
+        return { error: "fee-to-high" };
+      }
+
       const txhex = tx.to_hex();
       const txid = await broadcastRawTx(txhex);
 

src/pages/BsvWallet.tsx

@@ -221,6 +221,8 @@ export const BsvWallet = (props: BsvWalletProps) => {
           ? "Invalid Password!"
           : sendRes.error === "insufficient-funds"
           ? "Insufficient Funds!"
+          : sendRes.error === "fee-to-high"
+          ? "Miner fee to high!"
           : "An unknown error has occurred! Try again.";
 
       addSnackbar(message, "error");

src/pages/requests/BsvSendRequest.tsx

@@ -124,6 +124,8 @@ export const BsvSendRequest = (props: BsvSendRequestProps) => {
           ? "Invalid Password!"
           : sendRes.error === "insufficient-funds"
           ? "Insufficient Funds!"
+          : sendRes.error === "fee-to-high"
+          ? "Miner fee to high!"
           : "An unknown error has occurred! Try again.";
 
       addSnackbar(message, "error");