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// Copyright 2019 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 <string>
#include "base/callback_forward.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "mojo/public/cpp/bindings/binding.h"
#include "third_party/blink/public/mojom/payments/payment_handler_host.mojom.h"
namespace payments {
// Handles the communication from the payment handler renderer process to the
// merchant renderer process.
class PaymentHandlerHost : public mojom::PaymentHandlerHost {
// The interfce to be implemented by the object that can communicate to the
// merchant's renderer process.
class Delegate {
virtual ~Delegate() {}
// Notifies the merchant that the payment method has changed. Returns
// "false" if the state is invalid.
virtual bool ChangePaymentMethod(const std::string& method_name,
const std::string& stringified_data) = 0;
// The |delegate| cannot be null and must outlive this object. Typically this
// is accomplished by the |delegate| owning this object.
explicit PaymentHandlerHost(Delegate* delegate);
~PaymentHandlerHost() override;
// Returns "true" when the payment handler has changed the payment method, but
// has not received the response from the merchant yet.
bool is_changing_payment_method() const {
return !!change_payment_method_callback_;
// Binds to an IPC endpoint and returns it.
mojom::PaymentHandlerHostPtrInfo Bind();
// Notifies the payment handler of the updated details, such as updated total,
// in response to the change of the payment method.
void UpdateWith(mojom::PaymentMethodChangeResponsePtr response);
// Notifies the payment handler that the merchant did not handle the payment
// method change event, so the payment details are unchanged.
void NoUpdatedPaymentDetails();
// Disconnects from the payment handler.
void Disconnect();
// mojom::PaymentHandlerHost
void ChangePaymentMethod(
mojom::PaymentHandlerMethodDataPtr method_data,
mojom::PaymentHandlerHost::ChangePaymentMethodCallback callback) override;
// Payment handler's callback to invoke after merchant responds to the
// "payment method change" event.
// The end-point for the payment handler renderer process to call into the
// browser process.
mojo::Binding<mojom::PaymentHandlerHost> binding_;
// Not null and outlives this object. Owns this object.
Delegate* delegate_;
base::WeakPtrFactory<PaymentHandlerHost> weak_ptr_factory_{this};
} // namespace payments