feat: populate token details from contract address

src/app/wallet/views/token_list.nim

@@ -1,7 +1,7 @@
-import NimQml, tables
-import ../../../status/libstatus/tokens
-import ../../../status/libstatus/eth/contracts
+import NimQml, tables, json
+import ../../../status/libstatus/[tokens, settings, utils, eth/contracts]
 from web3/conversions import `$`
+import ../../../status/threads
 
 type
   TokenRoles {.pure.} = enum
@@ -81,3 +81,21 @@ QtObject:
     TokenRoles.Decimals.int:"decimals",
     TokenRoles.IsCustom.int:"isCustom"}.toTable
 
+  # Resolving a ENS name
+  proc getTokenDetails*(self: TokenList, address: string) {.slot.} =
+    spawnAndSend(self, "tokenDetailsResolved") do:
+      let tkn = newErc20Contract("", getCurrentNetwork(), address.parseAddress, "", 18, false)
+
+      let decimals = tkn.tokenDecimals()
+
+      $ (%* {
+        "address": address,
+        "name": tkn.tokenName(),
+        "symbol": tkn.tokenSymbol(),
+        "decimals": (if decimals == 0: "" else: $decimals)
+      })
+
+  proc tokenDetailsWereResolved*(self: TokenList, tokenDetails: string) {.signal.}
+
+  proc tokenDetailsResolved(self: TokenList, tokenDetails: string) {.slot.} =
+    self.tokenDetailsWereResolved(tokenDetails)

src/status/libstatus/tokens.nim

@@ -1,4 +1,4 @@
-import json, chronicles, strformat, stint, strutils, sequtils
+import json, chronicles, strformat, stint, strutils, sequtils, tables
 import core, wallet
 import ./eth/contracts
 import web3/[ethtypes, conversions]
@@ -131,3 +131,37 @@ proc getSNTAddress*(): string =
 proc getSNTBalance*(account: string): string =
   let snt = contracts.getSntContract()
   result = getTokenBalance($snt.address, account)
+
+proc getTokenString*(contract: Contract, methodName: string): string =
+  let payload = %* [{
+      "to": $contract.address,
+      "data": contract.methods[methodName].encodeAbi()
+    }, "latest"]
+  
+  let responseStr = callPrivateRPC("eth_call", payload)
+  let response = Json.decode(responseStr, RpcResponse)
+  if not response.error.isNil:
+    raise newException(RpcException, "Error getting token string - " & methodName & ": " & response.error.message)
+  if response.result == "0x":
+    return ""
+
+  let size = fromHex(Stuint[256], response.result[66..129]).toInt
+  result = response.result[130..129+size*2].parseHexStr
+
+proc tokenName*(contract: Contract): string = getTokenString(contract, "name")
+
+proc tokenSymbol*(contract: Contract): string = getTokenString(contract, "symbol")
+
+proc tokenDecimals*(contract: Contract): int =
+  let payload = %* [{
+      "to": $contract.address,
+      "data": contract.methods["decimals"].encodeAbi()
+    }, "latest"]
+  
+  let responseStr = callPrivateRPC("eth_call", payload)
+  let response = Json.decode(responseStr, RpcResponse)
+  if not response.error.isNil:
+    raise newException(RpcException, "Error getting token decimals: " & response.error.message)
+  if response.result == "0x":
+    return 0
+  result = parseHexInt(response.result)

ui/app/AppLayouts/Wallet/AddCustomTokenModal.qml

@@ -9,6 +9,7 @@ ModalPopup {
 
     property bool editable: true
     property int marginBetweenInputs: 35
+    property string validationError: ""
 
     title: editable ? 
         //% "Add custom token"
@@ -39,13 +40,57 @@ ModalPopup {
         open();
     }
 
+
+    function validate() {
+        if (addressInput.text !== "" && !Utils.isAddress(addressInput.text)) {
+            validationError = qsTr("This needs to be a valid address");
+        }
+        return validationError === ""
+    }
+
+    property var getTokenDetails: Backpressure.debounce(popup, 500, function (tokenAddress){
+        walletModel.customTokenList.getTokenDetails(tokenAddress)
+    });
+
+    function onKeyReleased(){
+        validationError = "";
+
+        if (!validate() || addressInput.text === "") {
+            return;
+        }
+        Qt.callLater(getTokenDetails, addressInput.text)
+    }
+
+    Item {
+        Connections {
+            target: walletModel.customTokenList
+            onTokenDetailsWereResolved: {
+                const jsonObj = JSON.parse(tokenDetails)
+
+                if(jsonObj.address === ""){
+                    validationError = qsTr("Invalid ERC20 address")
+                    return;
+                }
+
+                if(addressInput.text.toLowerCase() === jsonObj.address.toLowerCase()){
+                    symbolInput.text = jsonObj.symbol;
+                    decimalsInput.text = jsonObj.decimals;
+                    nameInput.text = jsonObj.name;
+                }
+            }
+        }
+    }
+
     Input {
         id: addressInput
         readOnly: !editable
+        textField.maximumLength: 42
         //% "Enter contract address..."
         placeholderText: qsTrId("enter-contract-address...")
         //% "Contract address"
         label: qsTrId("contract-address")
+        validationError: popup.validationError
+        Keys.onReleased: onKeyReleased()
     }
 
     Input {
@@ -98,7 +143,7 @@ ModalPopup {
             //% "Add"
             label: qsTrId("add")
 
-            disabled: addressInput.text === "" || nameInput.text === "" || symbolInput.text === "" || decimalsInput.text === ""
+            disabled: validationError !== "" && addressInput.text === "" || nameInput.text === "" || symbolInput.text === "" || decimalsInput.text === ""
 
             onClicked : {
                 const error = walletModel.addCustomToken(addressInput.text, nameInput.text, symbolInput.text, decimalsInput.text);