[Payments] Add the pay button, and control its enabled state

components/payments/content/payment_request.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.h"
 
+#include <algorithm>
 #include <unordered_map>
 #include <utility>
 
 #include "base/memory/ptr_util.h"
+#include "components/autofill/core/browser/autofill_data_util.h"
+#include "components/autofill/core/browser/field_types.h"
 #include "components/autofill/core/browser/personal_data_manager.h"
 #include "components/payments/content/payment_details_validation.h"
 #include "components/payments/content/payment_request_web_contents_manager.h"
 #include "components/payments/core/currency_formatter.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/web_contents.h"
 
 namespace payments {
 
 PaymentRequest::PaymentRequest(
     content::WebContents* web_contents,
     std::unique_ptr<PaymentRequestDelegate> delegate,
     PaymentRequestWebContentsManager* manager,
     mojo::InterfaceRequest<payments::mojom::PaymentRequest> request)
     : web_contents_(web_contents),
       delegate_(std::move(delegate)),
       manager_(manager),
       binding_(this, std::move(request)),
+      is_ready_to_pay_(false),
       selected_shipping_profile_(nullptr),
       selected_contact_profile_(nullptr),
       selected_credit_card_(nullptr) {
   // OnConnectionTerminated will be called when the Mojo pipe is closed. This
   // will happen as a result of many renderer-side events (both successful and
   // erroneous in nature).
   // TODO(crbug.com/683636): Investigate using
   // set_connection_error_with_reason_handler with Binding::CloseWithReason.
   binding_.set_connection_error_handler(base::Bind(
       &PaymentRequest::OnConnectionTerminated, base::Unretained(this)));
 }
 
 PaymentRequest::~PaymentRequest() {}
 
 void PaymentRequest::Init(
     payments::mojom::PaymentRequestClientPtr client,
     std::vector<payments::mojom::PaymentMethodDataPtr> method_data,
     payments::mojom::PaymentDetailsPtr details,
     payments::mojom::PaymentOptionsPtr options) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   std::string error;
   if (!payments::validatePaymentDetails(details, &error)) {
     LOG(ERROR) << error;
     OnConnectionTerminated();
     return;
   }
   client_ = std::move(client);
   details_ = std::move(details);
+  options_ = std::move(options);
   PopulateValidatedMethodData(method_data);
   PopulateProfileCache();
   SetDefaultProfileSelections();
+  UpdateIsReadyToPay();
 }
 
 void PaymentRequest::Show() {
   if (!client_.is_bound() || !binding_.is_bound()) {
     LOG(ERROR) << "Attempted Show(), but binding(s) missing.";
     OnConnectionTerminated();
     return;
   }
   delegate_->ShowDialog(this);
 }
@@ skipping 26 matching lines @@
   // connection_error_handler on |binding_|, which can mean that the renderer
   // has decided to close the pipe for various reasons (see all uses of
   // PaymentRequest::clearResolversAndCloseMojoConnection() in Blink). We close
   // the binding and the dialog, and ask to be deleted.
   client_.reset();
   binding_.Close();
   delegate_->CloseDialog();
   manager_->DestroyRequest(this);
 }
 
+void PaymentRequest::Pay() {
+  DCHECK(is_ready_to_pay_);
+
+  // TODO(mathp): Return the PaymentResponse to the |client_|.
+  UserCancelled();
+}
+
 CurrencyFormatter* PaymentRequest::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();
 }
@@ skipping 118 matching lines @@
               supported_card_networks_.push_back(networks[supported_network]);
               card_networks.erase(card_it);
             }
           }
         }
       }
     }
   }
 }
 
+void PaymentRequest::UpdateIsReadyToPay() {
+  is_ready_to_pay_ =
+      ArePaymentDetailsSatisfied() && ArePaymentOptionsSatisfied();
+}
+
+bool PaymentRequest::ArePaymentDetailsSatisfied() {
+  if (selected_credit_card_ == nullptr || !selected_credit_card_->IsValid())
+    return false;
+
+  const std::string basic_card_payment_type =
+      autofill::data_util::GetPaymentRequestData(selected_credit_card_->type())
+          .basic_card_payment_type;
+  return !supported_card_networks_.empty() &&
+         std::find(supported_card_networks_.begin(),
+                   supported_card_networks_.end(),
+                   basic_card_payment_type) != supported_card_networks_.end();
+}
+
+bool PaymentRequest::ArePaymentOptionsSatisfied() {
+  // TODO(mathp): Have a measure of shipping address completeness.
+  if (options_->request_shipping && selected_shipping_profile_ == nullptr)
+    return false;
+
+  // TODO(mathp): Make an encompassing class to validate contact info.
+  const std::string& app_locale = delegate_->GetApplicationLocale();
+  if (options_->request_payer_name &&
+      (selected_contact_profile_ == nullptr ||
+       selected_contact_profile_
+           ->GetInfo(autofill::AutofillType(autofill::NAME_FULL), app_locale)
+           .empty())) {
+    return false;
+  }
+  if (options_->request_payer_email &&
+      (selected_contact_profile_ == nullptr ||
+       selected_contact_profile_
+           ->GetInfo(autofill::AutofillType(autofill::EMAIL_ADDRESS),
+                     app_locale)
+           .empty())) {
+    return false;
+  }
+  if (options_->request_payer_phone &&
+      (selected_contact_profile_ == nullptr ||
+       selected_contact_profile_
+           ->GetInfo(autofill::AutofillType(autofill::PHONE_HOME_WHOLE_NUMBER),
+                     app_locale)
+           .empty())) {
+    return false;
+  }
+
+  return true;
+}
+
 }  // namespace payments