Show the fiat price when sending coins

BTCPayServer/Controllers/WalletsController.cs

@@ -13,6 +13,7 @@ using BTCPayServer.Models;
 using BTCPayServer.Models.WalletViewModels;
 using BTCPayServer.Security;
 using BTCPayServer.Services;
+using BTCPayServer.Services.Rates;
 using BTCPayServer.Services.Stores;
 using BTCPayServer.Services.Wallets;
 using LedgerWallet;
@@ -41,17 +42,22 @@ namespace BTCPayServer.Controllers
         private readonly ExplorerClientProvider _explorerProvider;
         private readonly IFeeProviderFactory _feeRateProvider;
         private readonly BTCPayWalletProvider _walletProvider;
-
+        BTCPayRateProviderFactory _RateProvider;
+        CurrencyNameTable _currencyTable;
         public WalletsController(StoreRepository repo,
+                                 CurrencyNameTable currencyTable,
                                  BTCPayNetworkProvider networkProvider,
                                  UserManager<ApplicationUser> userManager,
                                  IOptions<MvcJsonOptions> mvcJsonOptions,
                                  NBXplorerDashboard dashboard,
+                                 BTCPayRateProviderFactory rateProvider,
                                  ExplorerClientProvider explorerProvider,
                                  IFeeProviderFactory feeRateProvider,
                                  BTCPayWalletProvider walletProvider)
         {
+            _currencyTable = currencyTable;
             _Repo = repo;
+            _RateProvider = rateProvider;
             _NetworkProvider = networkProvider;
             _userManager = userManager;
             _mvcJsonOptions = mvcJsonOptions;
@@ -118,9 +124,30 @@ namespace BTCPayServer.Controllers
 
             if (paymentMethod == null)
                 return NotFound();
+
+            var storeData = store.GetStoreBlob();
+            var rateRules = store.GetStoreBlob().GetRateRules(_NetworkProvider);
+            rateRules.GlobalMultiplier = 1.0m;
+            var currencyPair = new Rating.CurrencyPair(paymentMethod.PaymentId.CryptoCode, storeData.DefaultLang ?? "USD");
             WalletModel model = new WalletModel();
             model.ServerUrl = GetLedgerWebsocketUrl(this.HttpContext, walletId.CryptoCode, paymentMethod.DerivationStrategyBase);
             model.CryptoCurrency = walletId.CryptoCode;
+
+            using (CancellationTokenSource cts = new CancellationTokenSource())
+            {
+                try
+                {
+                    cts.CancelAfter(TimeSpan.FromSeconds(5));
+                    var result = await _RateProvider.FetchRate(currencyPair, rateRules).WithCancellation(cts.Token);
+                    if (result.Value != null)
+                    {
+                        model.Rate = result.Value;
+                        model.Divisibility = _currencyTable.GetNumberFormatInfo(currencyPair.Right, true).CurrencyDecimalDigits;
+                        model.Fiat = currencyPair.Right;
+                    }
+                }
+                catch { }
+            }
             return View(model);
         }
 

BTCPayServer/Models/WalletViewModels/WalletModel.cs

@@ -15,5 +15,8 @@ namespace BTCPayServer.Models.WalletViewModels
             get;
             set;
         }
+        public decimal? Rate { get; set; }
+        public int Divisibility { get; set; }
+        public string Fiat { get; set; }
     }
 }

BTCPayServer/Views/Wallets/WalletSend.cshtml

@@ -41,7 +41,14 @@
             </div>
             <div class="form-group">
                 <label>Amount</label>
-                <input id="amount-textbox" name="Amount" class="form-control" type="text" />
+                <div class="input-group">
+                    <input id="amount-textbox" name="Amount" class="form-control" type="text" onkeyup='updateFiatValue();' />
+                    <div class="input-group-prepend">
+                        <span class="input-group-text text-muted" style="display:none;" id="fiatValue"></span>
+                    </div>
+                </div>
+
+                @*<span class="text-muted" id="fiatValue"></span>*@
                 <span id="Amount-Error" class="text-danger"></span>
                 <p class="form-text text-muted crypto-info" style="display: none;">
                     Your current balance is <a id="crypto-balance-link" href="#"><span id="crypto-balance"></span></a> <span id="crypto-code"></span>.
@@ -63,11 +70,11 @@
         </form>
     </div>
 </div>
-    @section Scripts
+@section Scripts
     {
     <script type="text/javascript">
 		    var srvModel = @Html.Raw(Json.Serialize(Model));
     </script>
     <script src="~/js/ledgerwebsocket.js" type="text/javascript" defer="defer"></script>
     <script src="~/js/StoreWallet.js" type="text/javascript" defer="defer"></script>
-    }
+}

BTCPayServer/wwwroot/js/StoreWallet.js

@@ -1,4 +1,15 @@
-$(function () {
+
+function updateFiatValue() {
+    if (srvModel.rate !== null) {
+        var fiatValue = $("#fiatValue");
+        fiatValue.css("display", "inline");
+        var amountValue = parseFloat($("#amount-textbox").val());
+        if (!isNaN(amountValue)) {
+            fiatValue.text("= " + (srvModel.rate * amountValue).toFixed(srvModel.divisibility) + " " + srvModel.fiat);
+        }
+    }
+}
+$(function () {
     var ledgerDetected = false;
     var bridge = new ledgerwebsocket.LedgerWebSocketBridge(srvModel.serverUrl);
     var recommendedFees = "";