[Payments] Desktop: implement shipping address/option change

components/payments/content/payment_request_spec.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/payments/content/payment_request_spec.h"
 
 #include <utility>
 
 #include "base/logging.h"
 
 namespace payments {
 
 const char kBasicCardMethodName[] = "basic-card";
 
 PaymentRequestSpec::PaymentRequestSpec(
     mojom::PaymentOptionsPtr options,
     mojom::PaymentDetailsPtr details,
     std::vector<mojom::PaymentMethodDataPtr> method_data,
     Observer* observer,
     const std::string& app_locale)
     : options_(std::move(options)),
       details_(std::move(details)),
-      app_locale_(app_locale) {
+      app_locale_(app_locale),
+      selected_shipping_option_(nullptr),
+      observer_for_testing_(nullptr) {
   if (observer)
     AddObserver(observer);
+  UpdateSelectedShippingOption();
   PopulateValidatedMethodData(method_data);
 }
 PaymentRequestSpec::~PaymentRequestSpec() {}
 
+void PaymentRequestSpec::UpdateWith(mojom::PaymentDetailsPtr details) {
+  details_ = std::move(details);
+  // We reparse the |details_| and update the observers.
+  UpdateSelectedShippingOption();
+  NotifyOnSpecUpdated();
+}
+
 void PaymentRequestSpec::AddObserver(Observer* observer) {
   CHECK(observer);
   observers_.AddObserver(observer);
 }
 
 void PaymentRequestSpec::RemoveObserver(Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
 bool PaymentRequestSpec::request_shipping() const {
@@ skipping 117 matching lines @@
           }
         }
       }
     }
   }
 
   supported_card_networks_set_.insert(supported_card_networks_.begin(),
                                       supported_card_networks_.end());
 }
 
+void PaymentRequestSpec::UpdateSelectedShippingOption() {
+  if (!request_shipping())
+    return;
+
+  // As per the spec, the selected shipping option should initially be the last
+  // one in the array that has its selected field set to true.
+  auto selected_shipping_option_it = std::find_if(
+      details().shipping_options.rbegin(), details().shipping_options.rend(),
+      [](const payments::mojom::PaymentShippingOptionPtr& element) {
+        return element->selected;
+      });
+  if (selected_shipping_option_it != details().shipping_options.rend()) {
+    selected_shipping_option_ = selected_shipping_option_it->get();
+  }
+}
+
 void PaymentRequestSpec::NotifyOnInvalidSpecProvided() {
   for (auto& observer : observers_)
     observer.OnInvalidSpecProvided();
+  if (observer_for_testing_)
+    observer_for_testing_->OnInvalidSpecProvided();
+}
+
+void PaymentRequestSpec::NotifyOnSpecUpdated() {
+  for (auto& observer : observers_)
+    observer.OnSpecUpdated();
+  if (observer_for_testing_)
+    observer_for_testing_->OnSpecUpdated();
 }
 
 CurrencyFormatter* PaymentRequestSpec::GetOrCreateCurrencyFormatter(
     const std::string& currency_code,
     const std::string& currency_system,
     const std::string& locale_name) {
   if (!currency_formatter_) {
     currency_formatter_.reset(
         new CurrencyFormatter(currency_code, currency_system, locale_name));
   }
   return currency_formatter_.get();
 }
 
 }  // namespace payments