MAGETWO-72626: [2.3.x][Github] Race condition causing duplicate orders with double-clicks on Braintree "Place Order" button #10767

Author: svitja

app/code/Magento/Braintree/view/frontend/web/js/view/payment/method-renderer/hosted-fields.js

@@ -61,7 +61,7 @@ define([
         },
 
         /**
-         * @returns {Bool}
+         * @returns {Boolean}
          */
         isVaultEnabled: function () {
             return this.vaultEnabler.isVaultEnabled();
@@ -142,11 +142,20 @@ define([
             return true;
         },
 
+        /**
+         * Returns state of place order button
+         * @returns {Boolean}
+         */
+        isButtonActive: function () {
+            return this.isActive() && this.isPlaceOrderActionAllowed();
+        },
+
         /**
          * Trigger order placing
          */
         placeOrderClick: function () {
             if (this.validateCardType()) {
+                this.isPlaceOrderActionAllowed(false);
                 $(this.getSelector('submit')).trigger('click');
             }
         },

app/code/Magento/Braintree/view/frontend/web/template/payment/form.html

@@ -141,8 +141,7 @@
                         data-bind="
                             click: placeOrderClick,
                             attr: {title: $t('Place Order')},
-                            css: {disabled: !isPlaceOrderActionAllowed()},
-                            enable: isActive()
+                            enable: isButtonActive()
                         "
                         disabled>
                     <span data-bind="i18n: 'Place Order'"></span>