Point of Sale support free entry

BTCPayServer.Tests/UnitTest1.cs

@@ -997,7 +997,7 @@ namespace BTCPayServer.Tests
                 Assert.Equal("orange", vmview.Items[1].Title);
                 Assert.Equal(10.0m, vmview.Items[1].Price.Value);
                 Assert.Equal("$5.00", vmview.Items[0].Price.Formatted);
-                Assert.IsType<RedirectResult>(apps.ViewPointOfSale(appId, "orange").Result);
+                Assert.IsType<RedirectResult>(apps.ViewPointOfSale(appId, 0, "orange").Result);
                 var invoice = user.BitPay.GetInvoices().First();
                 Assert.Equal(10.00, invoice.Price);
                 Assert.Equal("CAD", invoice.Currency);

BTCPayServer/BTCPayServer.csproj

@@ -2,7 +2,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>netcoreapp2.0</TargetFramework>
-		<Version>1.0.1.92</Version>
+		<Version>1.0.1.93</Version>
     <NoWarn>NU1701,CA1816,CA1308,CA1810,CA2208</NoWarn>
   </PropertyGroup>
   <ItemGroup>

BTCPayServer/Controllers/AppsController.PointOfSale.cs

@@ -42,10 +42,12 @@ namespace BTCPayServer.Controllers
                     "  price: 15\n\n" +
                     "tshirt:\n" +
                     "  price: 25";
+                ShowCustomAmount = true;
             }
             public string Title { get; set; }
             public string Currency { get; set; }
             public string Template { get; set; }
+            public bool ShowCustomAmount { get; set; }
         }
 
         [HttpGet]
@@ -57,7 +59,7 @@ namespace BTCPayServer.Controllers
                 return NotFound();
 
             var settings = app.GetSettings<PointOfSaleSettings>();
-            return View(new UpdatePointOfSaleViewModel() { Title = settings.Title, Currency = settings.Currency, Template = settings.Template });
+            return View(new UpdatePointOfSaleViewModel() { Title = settings.Title, ShowCustomAmount = settings.ShowCustomAmount, Currency = settings.Currency, Template = settings.Template });
         }
         [HttpPost]
         [Route("{appId}/settings/pos")]
@@ -83,6 +85,7 @@ namespace BTCPayServer.Controllers
             app.SetSettings(new PointOfSaleSettings()
             {
                 Title = vm.Title,
+                ShowCustomAmount = vm.ShowCustomAmount,
                 Currency = vm.Currency.ToUpperInvariant(),
                 Template = vm.Template
             });
@@ -99,9 +102,13 @@ namespace BTCPayServer.Controllers
             if (app == null)
                 return NotFound();
             var settings = app.GetSettings<PointOfSaleSettings>();
+            var currency = _Currencies.GetCurrencyData(settings.Currency);
+            double step = currency == null ? 1 : Math.Pow(10, -(currency.Divisibility));
             return View(new ViewPointOfSaleViewModel()
             {
                 Title = settings.Title,
+                Step = step.ToString(CultureInfo.InvariantCulture),
+                ShowCustomAmount = settings.ShowCustomAmount,
                 Items = Parse(settings.Template, settings.Currency)
             });
         }
@@ -155,23 +162,43 @@ namespace BTCPayServer.Controllers
 
         [HttpPost]
         [Route("{appId}/pos")]
-        public async Task<IActionResult> ViewPointOfSale(string appId, string choiceKey)
+        public async Task<IActionResult> ViewPointOfSale(string appId, double amount, string choiceKey)
         {
             var app = await GetApp(appId, AppType.PointOfSale);
+            if (string.IsNullOrEmpty(choiceKey) && amount <= 0)
+            {
+                return RedirectToAction(nameof(ViewPointOfSale), new { appId = appId });
+            }
             if (app == null)
                 return NotFound();
             var settings = app.GetSettings<PointOfSaleSettings>();
+            if(string.IsNullOrEmpty(choiceKey) && !settings.ShowCustomAmount)
+            {
+                return RedirectToAction(nameof(ViewPointOfSale), new { appId = appId });
+            }
+            string title = null;
+            double price = 0.0;
+            if (!string.IsNullOrEmpty(choiceKey))
+            {
                 var choices = Parse(settings.Template, settings.Currency);
                 var choice = choices.FirstOrDefault(c => c.Id == choiceKey);
                 if (choice == null)
                     return NotFound();
+                title = choice.Title;
+                price = (double)choice.Price.Value;
+            }
+            else
+            {
+                price = amount;
+                title = settings.Title;
+            }
 
             var store = await GetStore(app);
             var invoice = await _InvoiceController.CreateInvoiceCore(new NBitpayClient.Invoice()
             {
-                ItemDesc = choice.Title,
+                ItemDesc = title,
                 Currency = settings.Currency,
-                Price = (double)choice.Price.Value,
+                Price = price,
             }, store, HttpContext.Request.GetAbsoluteRoot());
             return Redirect(invoice.Data.Url);
         }

BTCPayServer/Models/AppViewModels/UpdatePointOfSaleViewModel.cs

@@ -17,5 +17,8 @@ namespace BTCPayServer.Models.AppViewModels
         [Required]
         [MaxLength(5000)]
         public string Template { get; set; }
+
+        [Display(Name = "User can input custom amount")]
+        public bool ShowCustomAmount { get; set; }
     }
 }

BTCPayServer/Models/AppViewModels/ViewPointOfSaleViewModel.cs

@@ -18,6 +18,8 @@ namespace BTCPayServer.Models.AppViewModels
             public ItemPrice Price { get; set; }
             public string Title { get; set; }
         }
+        public bool ShowCustomAmount { get; set; }
+        public string Step { get; set; }
         public string Title { get; set; }
         public Item[] Items { get; set; }
     }

BTCPayServer/Views/Apps/UpdatePointOfSale.cshtml

@@ -29,6 +29,10 @@
                         <input asp-for="Currency" class="form-control" />
                         <span asp-validation-for="Currency" class="text-danger"></span>
                     </div>
+                    <div class="form-group">
+                        <label asp-for="ShowCustomAmount"></label>
+                        <input asp-for="ShowCustomAmount" type="checkbox" class="form-check" />
+                    </div>
                     <div class="form-group">
                         <label asp-for="Template" class="control-label"></label>*
                         <textarea asp-for="Template" rows="20" cols="40" class="form-control"></textarea>

BTCPayServer/Views/Apps/ViewPointOfSale.cshtml

@@ -28,18 +28,20 @@
                     }
                 </div>
             </form>
-            @*<div class="row mt-4">
+            @if(Model.ShowCustomAmount)
+            {
+                <div class="row mt-4">
                     <div class="col-md-4 offset-md-4 col-sm-6 offset-sm-3">
-                        <h3>Something else</h3>
+                        <form method="post" data-buy>
-                        <form data-buy>
                             <div class="input-group">
-                                <input class="form-control" type="number" step="0.00001" name="amount" placeholder="undefined (optional)"><div class="input-group-append">
+                                <input class="form-control" type="number" min="0" step="@Model.Step" name="amount" placeholder="amount"><div class="input-group-append">
                                     <button class="btn btn-primary" type="submit">Pay</button>
                                 </div>
                             </div>
                         </form>
                     </div>
-                </div>*@
+                </div>
+            }
         </div>
     </div>
     <script src="~/vendor/jquery/jquery.js"></script>