From 184c797b0e40020dbd5438f3f28f7c32dfb34d85 Mon Sep 17 00:00:00 2001
From: Ludovic <dolu89@gmail.com>
Date: Wed, 3 Apr 2019 21:43:53 +0200
Subject: [PATCH] Add a new Pay Button Type : Custom amount

---
 BTCPayServer/Controllers/StoresController.cs  |  3 +-
 .../StoreViewModels/PayButtonViewModel.cs     |  6 +--
 BTCPayServer/Views/Stores/PayButton.cshtml    | 35 +++++++++-----
 BTCPayServer/wwwroot/paybutton/paybutton.js   | 46 +++++++++++++++----
 4 files changed, 63 insertions(+), 27 deletions(-)

diff --git a/BTCPayServer/Controllers/StoresController.cs b/BTCPayServer/Controllers/StoresController.cs
index 4335336ea..8f267b8d2 100644
--- a/BTCPayServer/Controllers/StoresController.cs
+++ b/BTCPayServer/Controllers/StoresController.cs
@@ -891,7 +891,8 @@ namespace BTCPayServer.Controllers
                 ButtonSize = 2,
                 UrlRoot = appUrl,
                 PayButtonImageUrl = appUrl + "img/paybutton/pay.png",
-                StoreId = store.Id
+                StoreId = store.Id,
+                ButtonType = 0
             };
             return View(model);
         }
diff --git a/BTCPayServer/Models/StoreViewModels/PayButtonViewModel.cs b/BTCPayServer/Models/StoreViewModels/PayButtonViewModel.cs
index 2c6687e93..27a649594 100644
--- a/BTCPayServer/Models/StoreViewModels/PayButtonViewModel.cs
+++ b/BTCPayServer/Models/StoreViewModels/PayButtonViewModel.cs
@@ -1,8 +1,5 @@
-using System;
-using System.Collections.Generic;
+using System.Collections.Generic;
 using System.ComponentModel.DataAnnotations;
-using System.Linq;
-using System.Threading.Tasks;
 using BTCPayServer.ModelBinders;
 using Microsoft.AspNetCore.Mvc;
 
@@ -18,6 +15,7 @@ namespace BTCPayServer.Models.StoreViewModels
         public string CheckoutDesc { get; set; }
         public string OrderId { get; set; }
         public int ButtonSize { get; set; }
+        public int ButtonType { get; set; }
         [Url]
         public string ServerIpn { get; set; }
         [Url]
diff --git a/BTCPayServer/Views/Stores/PayButton.cshtml b/BTCPayServer/Views/Stores/PayButton.cshtml
index 215685018..eb0223a77 100644
--- a/BTCPayServer/Views/Stores/PayButton.cshtml
+++ b/BTCPayServer/Views/Stores/PayButton.cshtml
@@ -57,6 +57,17 @@
                     </button>
                 </div>
             </div>
+            <div class="form-group">
+                <label>Button Type</label>
+                <div>
+                    <input type="radio" name="button-type" id="btn-fixed" value="0" v-model="srvModel.buttonType" v-on:change="inputChanges" checked />
+                    <label for="btn-fixed">Fixed amount</label>
+                </div>
+                <div>
+                    <input type="radio" name="button-type" id="btn-custom" value="1" v-model="srvModel.buttonType" v-on:change="inputChanges" />
+                    <label for="btn-custom">Custom amount</label>
+                </div>
+            </div>
         </div>
         <div class="col-lg-5">
             <br />
@@ -123,20 +134,20 @@
     </div>
 
 
-@section HeadScripts {
-    <link rel="stylesheet" href="~/vendor/highlightjs/default.min.css">
-    <script src="~/vendor/highlightjs/highlight.min.js"></script>
+    @section HeadScripts {
+        <link rel="stylesheet" href="~/vendor/highlightjs/default.min.css">
+        <script src="~/vendor/highlightjs/highlight.min.js"></script>
 
-    <script src="~/vendor/vuejs/vue.js"></script>
-    <script src="~/vendor/vuejs-vee-validate/vee-validate.js"></script>
+        <script src="~/vendor/vuejs/vue.js"></script>
+        <script src="~/vendor/vuejs-vee-validate/vee-validate.js"></script>
 
-    <script src="~/vendor/clipboard.js/clipboard.js"></script>
+        <script src="~/vendor/clipboard.js/clipboard.js"></script>
 
-    <script src="~/paybutton/paybutton.js"></script>
-}
+        <script src="~/paybutton/paybutton.js"></script>
+    }
 
-@section Scripts {
-    <script type="text/javascript">
+    @section Scripts {
+        <script type="text/javascript">
         var srvModel = @Html.Raw(Json.Serialize(Model));
 
         var payButtonCtrl = new Vue({
@@ -150,5 +161,5 @@
                 }
             }
         });
-    </script>
-}
+        </script>
+    }
diff --git a/BTCPayServer/wwwroot/paybutton/paybutton.js b/BTCPayServer/wwwroot/paybutton/paybutton.js
index a901a14fc..1248218ec 100644
--- a/BTCPayServer/wwwroot/paybutton/paybutton.js
+++ b/BTCPayServer/wwwroot/paybutton/paybutton.js
@@ -22,7 +22,7 @@ function esc(input) {
         (but it's not necessary).
         Or for XML, only if the named entities are defined in its DTD.
         */
-    ;
+        ;
 }
 
 Vue.use(VeeValidate);
@@ -42,9 +42,35 @@ function inputChanges(event, buttonSize) {
         srvModel.buttonSize = buttonSize;
     }
 
+    var width = "209px";
+    var widthInput = "3em";
+    if (srvModel.buttonSize === 0) {
+        width = "146px";
+        widthInput = "2em";
+    } else if (srvModel.buttonSize === 1) {
+        width = "168px";
+    } else if (srvModel.buttonSize === 2) {
+        width = "209px";
+    }
+
     var html = '<form method="POST" action="' + esc(srvModel.urlRoot) + 'api/v1/invoices">';
     html += addinput("storeId", srvModel.storeId);
-    html += addinput("price", srvModel.price);
+
+    // Add price as hidden only if it's a fixed amount
+    if (srvModel.buttonType == 0) {
+        html += addinput("price", srvModel.price);
+    }
+    else if (srvModel.buttonType == 1) {
+        html += '\n    <div style="text-align:center;width:' + width + '">';
+        html += addPlusMinusButton("-");
+        html += '<input type="text" id="btcpay-input-price" name="price" value="' + srvModel.price + '" style="' +
+            'border:none;background-image:none;background-color:transparent;-webkit-box-shadow:none;-moz-box-shadow:none;-webkit-appearance: none;' + // Reset css
+            'width:' + widthInput + ';text-align:center;font-size:25px;margin:auto;border-radius:5px;line-height:50px;background:#fff;"' + // Custom css
+            'oninput="event.preventDefault();isNaN(event.target.value) ? document.querySelector(\'#btcpay-input-price\').value = ' + srvModel.price + ' : event.target.value" />'; // Method to try if it's a number
+        html += addPlusMinusButton("+");
+        html += '</div>';
+    }
+
     if (srvModel.currency) {
         html += addinput("currency", srvModel.currency);
     }
@@ -65,14 +91,6 @@ function inputChanges(event, buttonSize) {
         html += addinput("notifyEmail", srvModel.notifyEmail);
     }
 
-    var width = "209px";
-    if (srvModel.buttonSize === 0) {
-        width = "146px";
-    } else if (srvModel.buttonSize === 1) {
-        width = "168px";
-    } else if (srvModel.buttonSize === 2) {
-        width = "209px";
-    }
     html += '\n    <input type="image" src="' + esc(srvModel.payButtonImageUrl) + '" name="submit" style="width:' + width +
         '" alt="Pay with BtcPay, Self-Hosted Bitcoin Payment Processor">';
 
@@ -93,3 +111,11 @@ function addinput(name, value) {
     return html;
 }
 
+function addPlusMinusButton(type) {
+    var button = '<button style="cursor:pointer; font-size:25px; line-height: 25px; background: rgba(0,0,0,.1); height: 30px; width: 45px; border:none; border-radius: 60px; margin: auto;" onclick="event.preventDefault();document.querySelector(\'#btcpay-input-price\').value = parseInt(document.querySelector(\'#btcpay-input-price\').value) TYPE 1;">TYPE</button>';
+    if (type === "+") {
+        return button.replace(/TYPE/g, '+');
+    } else {
+        return button.replace(/TYPE/g, '-');
+    }
+}