feat: identify if a token is being approved and estimate gas for contract trxs

src/app/wallet/view.nim

@@ -265,14 +265,14 @@ QtObject:
     read = getAccountList
     notify = accountListChanged
   
-  proc estimateGas*(self: WalletView, from_addr: string, to: string, assetAddress: string, value: string): string {.slot.} =
+  proc estimateGas*(self: WalletView, from_addr: string, to: string, assetAddress: string, value: string, data: string = ""): string {.slot.} =
     var
       response: int
       success: bool
     if assetAddress != ZERO_ADDRESS and not assetAddress.isEmptyOrWhitespace:
       response = self.status.wallet.estimateTokenGas(from_addr, to, assetAddress, value, success)
     else:
-      response = self.status.wallet.estimateGas(from_addr, to, value, success)
+      response = self.status.wallet.estimateGas(from_addr, to, value, data, success)
     result = $(%* { "result": %response, "success": %success })
 
   proc transactionWasSent*(self: WalletView, txResult: string) {.signal.}
@@ -522,6 +522,16 @@ QtObject:
   proc isKnownTokenContract*(self: WalletView, address: string): bool {.slot.} =
     return self.status.wallet.getKnownTokenContract(parseAddress(address)) != nil
 
+  proc decodeTokenApproval*(self: WalletView, tokenAddress: string, data: string): string {.slot.} =
+    let amount = data[74..len(data)-1]
+    let token = getToken(tokenAddress)
+    
+    if(token != nil):
+      let amountDec = $hex2Token(amount, token.decimals)
+      return $(%* {"symbol": token.symbol, "amount": amountDec})
+    
+    return """{"error":"Unknown token address"}""";
+
   proc isHistoryFetched*(self: WalletView, address: string): bool {.slot.} =
     return self.currentTransactions.rowCount() > 0
 

src/status/libstatus/tokens.nim

@@ -1,4 +1,4 @@
-import json, chronicles, strformat, stint, strutils
+import json, chronicles, strformat, stint, strutils, sequtils
 import core, wallet
 import ./eth/contracts
 import web3/[ethtypes, conversions]
@@ -101,6 +101,9 @@ proc getTokensBalances*(accounts: openArray[string], tokens: openArray[string]):
     return %* {}
   response["result"]
 
+proc getToken*(tokenAddress: string): Erc20Contract =
+  getErc20Contracts().concat(getCustomTokens()).getErc20ContractByAddress(tokenAddress.parseAddress)
+
 proc getTokenBalance*(tokenAddress: string, account: string): string = 
   var postfixedAccount: string = account
   postfixedAccount.removePrefix("0x")

src/status/wallet.nim

@@ -70,10 +70,11 @@ proc buildTokenTransaction(self: WalletModel, source, to, assetAddress: Address,
 proc getKnownTokenContract*(self: WalletModel, address: Address): Erc20Contract =
   getErc20Contracts().concat(getCustomTokens()).getErc20ContractByAddress(address)
 
-proc estimateGas*(self: WalletModel, source, to, value: string, success: var bool): int =
+proc estimateGas*(self: WalletModel, source, to, value, data: string, success: var bool): int =
   var tx = transactions.buildTransaction(
     parseAddress(source),
-    eth2Wei(parseFloat(value), 18)
+    eth2Wei(parseFloat(value), 18),
+    data = data
   )
   tx.to = parseAddress(to).some
   let response = eth.estimateGas(tx, success)

ui/app/AppLayouts/Browser/BrowserLayout.qml

@@ -114,32 +114,32 @@ Rectangle {
                 }
             } else if (request.type === Constants.web3SendAsyncReadOnly &&
                        request.payload.method === "eth_sendTransaction") {
-                const sendDialog = sendTransactionModalComponent.createObject(browserWindow);
+                walletModel.setFocusedAccountByAddress(request.payload.params[0].from)
+                var acc = walletModel.focusedAccount
+                const value = utilsModel.wei2Token(request.payload.params[0].value, 18)
 
-                _walletModel.setFocusedAccountByAddress(request.payload.params[0].from)
-                var acc = _walletModel.focusedAccount
-                sendDialog.selectedAccount = {
+                const sendDialog = sendTransactionModalComponent.createObject(browserWindow, {
+                    trxData:request.payload.params[0].data,
+                    selectedAccount: {
                         name: acc.name,
                         address: request.payload.params[0].from,
                         iconColor: acc.iconColor,
                         assets: acc.assets
-                }
-                sendDialog.selectedRecipient = {
+                    },
+                    selectedRecipient: {
                         address: request.payload.params[0].to,
-                    identicon: _chatsModel.generateIdenticon(request.payload.params[0].to),
-                    name: _chatsModel.activeChannel.name,
+                        identicon: chatsModel.generateIdenticon(request.payload.params[0].to),
+                        name: chatsModel.activeChannel.name,
                         type: RecipientSelector.Type.Address
-                };
-                // TODO get this from data
-                sendDialog.selectedAsset = {
+                    },
+                    selectedAsset: {
                         name: "ETH",
                         symbol: "ETH",
                         address: Constants.zeroAddress
-                };
-                const value = _utilsModel.wei2Token(request.payload.params[0].value, 18)
-                sendDialog.selectedAmount = value
-                // TODO calculate that
-                sendDialog.selectedFiatAmount = "42";
+                    },
+                    selectedFiatAmount: "42", // TODO calculate that
+                    selectedAmount: value
+                });
 
                 // TODO change sendTransaction function to the postMessage one
                 sendDialog.sendTransaction = function (selectedGasLimit, selectedGasPrice, enteredPassword) {
@@ -180,6 +180,7 @@ Rectangle {
                     sendDialog.destroy()
                 }
 
+                sendDialog.estimateGas()
                 sendDialog.open();
                 walletModel.getGasPricePredictions()
             } else if (request.type === Constants.web3SendAsyncReadOnly && ["eth_sign", "personal_sign", "eth_signTypedData", "eth_signTypedData_v3"].indexOf(request.payload.method) > -1) {

ui/app/AppLayouts/Chat/ChatColumn/ChatComponents/SignTransactionModal.qml

@@ -13,6 +13,8 @@ ModalPopup {
     property var selectedAmount
     property var selectedFiatAmount
 
+    property string trxData: ""
+
     property alias transactionSigner: transactionSigner
 
     property var sendTransaction: function(selectedGasLimit, selectedGasPrice, enteredPassword) {
@@ -38,6 +40,10 @@ ModalPopup {
         root.close()
     }
 
+    function estimateGas(){
+        gasSelector.estimateGas()
+    }
+
     id: root
 
     //% "Send"
@@ -68,7 +74,14 @@ ModalPopup {
         TransactionFormGroup {
             id: group1
             //% "Send"
-            headerText: qsTrId("command-button-send")
+            headerText: {
+                if(trxData.startsWith("0x095ea7b3")){
+                    const approveData = JSON.parse(walletModel.decodeTokenApproval(selectedRecipient.address, trxData))
+                    if(approveData.symbol)
+                        return qsTr("Authorize %1 %2").arg(approveData.amount).arg(approveData.symbol)    
+                }
+                return qsTrId("command-button-send");
+            }
             //% "Preview"
             footerText: qsTrId("preview")
 
@@ -87,6 +100,7 @@ ModalPopup {
                 }
 
                 function estimateGas() {
+                    console.log("CALLING ESTIMATE GAS")
                     if (!(root.selectedAccount && root.selectedAccount.address &&
                         root.selectedRecipient && root.selectedRecipient.address &&
                         root.selectedAsset && root.selectedAsset.address &&
@@ -96,7 +110,8 @@ ModalPopup {
                         root.selectedAccount.address,
                         root.selectedRecipient.address,
                         root.selectedAsset.address,
-                        root.selectedAmount))
+                        root.selectedAmount,
+                        trxData))
 
                     if (!gasEstimate.success) {
                         //% "Error estimating gas: %1"