[FIX] payment_stripe: charge creation failed

To reproduce:
- Buy a product costing 0.01
- Validate the cart, pay with Stripe
- Enter the credit card info, validate

Stripe cannot process the transaction (minimum charge is not met), but
the user is not warned about it. The Stripe pop-up is closed and the
error is recorded in the console silently.

opw-765775

addons/payment_stripe/i18n/payment_stripe.pot

@@ -40,11 +40,25 @@ msgstr ""
 msgid "Checkout Image URL"
 msgstr ""
 
+#. module: payment_stripe
+#. openerp-web
+#: code:addons/payment_stripe/static/src/xml/stripe_templates.xml:15
+#, python-format
+msgid "Close"
+msgstr ""
+
 #. module: payment_stripe
 #: model:ir.ui.view,arch_db:payment_stripe.stripe_s2s_form
 msgid "Confirm <span class=\"fa fa-long-arrow-right\"/>"
 msgstr ""
 
+#. module: payment_stripe
+#. openerp-web
+#: code:addons/payment_stripe/static/src/xml/stripe_templates.xml:9
+#, python-format
+msgid "Error"
+msgstr ""
+
 #. module: payment_stripe
 #: model:ir.ui.view,arch_db:payment_stripe.stripe_s2s_form
 msgid "Expiration Date"
@@ -65,6 +79,13 @@ msgstr ""
 msgid "Payment Transaction"
 msgstr ""
 
+#. module: payment_stripe
+#. openerp-web
+#: code:addons/payment_stripe/static/src/js/stripe.js:43
+#, python-format
+msgid "Payment error"
+msgstr ""
+
 #. module: payment_stripe
 #: model:ir.model.fields,field_description:payment_stripe.field_payment_acquirer_stripe_publishable_key
 msgid "Stripe publishable key"
@@ -84,7 +105,7 @@ msgstr ""
 #. module: payment_stripe
 #: code:addons/payment_stripe/models/payment.py:111
 #, python-format
-msgid "Stripe: invalid reply received from provider, missing reference"
+msgid "Stripe: invalid reply received from provider, missing reference. Additional message: %s"
 msgstr ""
 
 #. module: payment_stripe

addons/payment_stripe/models/payment.py

@@ -116,10 +116,13 @@ def stripe_s2s_do_transaction(self, **kwargs):
     def _stripe_form_get_tx_from_data(self, data):
         """ Given a data dict coming from stripe, verify it and find the related
         transaction record. """
-        reference = data['metadata']['reference']
+        reference = data.get('metadata', {}).get('reference')
         if not reference:
-            error_msg = _('Stripe: invalid reply received from provider, missing reference')
-            _logger.error(error_msg, data['metadata'])
+            error_msg = _(
+                'Stripe: invalid reply received from provider, missing reference. Additional message: %s'
+                % data.get('error', {}).get('message', '')
+            )
+            _logger.error(error_msg)
             raise ValidationError(error_msg)
         tx = self.search([('reference', '=', reference)])
         if not tx:

addons/payment_stripe/static/src/js/stripe.js

@@ -2,6 +2,11 @@ odoo.define('payment_stripe.stripe', function(require) {
     "use strict";
 
     var ajax = require('web.ajax');
+    var core = require('web.core');
+    var _t = core._t;
+    var qweb = core.qweb;
+    ajax.loadXML('/payment_stripe/static/src/xml/stripe_templates.xml', qweb);
+
     // The following currencies are integer only, see
     // https://stripe.com/docs/currencies#zero-decimal
     var int_currencies = [
@@ -33,6 +38,10 @@ odoo.define('payment_stripe.stripe', function(require) {
             }).done(function(data){
                 handler.isTokenGenerate = false;
                 window.location.href = data;
+            }).fail(function(){
+                var msg = arguments && arguments[1] && arguments[1].data && arguments[1].data.message;
+                var wizard = $(qweb.render('stripe.error', {'msg': msg || _t('Payment error')}));
+                wizard.appendTo($('body')).modal({'keyboard': true});
             });
         },
     });

addons/payment_stripe/static/src/xml/stripe_templates.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<templates id="template" xml:space="preserve">
+<t t-name="stripe.error">
+    <div class="modal fade">
+        <div class="modal-dialog">
+            <div class="modal-content">
+                <div class="modal-header">
+                    <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&amp;times;</button>
+                    <h4 class="modal-title">Error</h4>
+                </div>
+                <div class="modal-body">
+                    <t t-esc="msg"></t>
+                </div>
+                <div class="modal-footer">
+                    <a href="#" class="btn btn-link btn-xs" data-dismiss="modal">Close</a>
+                </div>
+            </div>
+        </div>
+    </div>
+</t>
+</templates>