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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_CAST_RECEIVER_BROWSER_BINDINGS_MANAGER_H_
#define COMPONENTS_CAST_RECEIVER_BROWSER_BINDINGS_MANAGER_H_
#include <map>
#include <memory>
#include <string_view>
#include "base/containers/flat_map.h"
#include "base/memory/raw_ref.h"
#include "base/memory/weak_ptr.h"
#include "components/cast/api_bindings/manager.h"
#include "components/cast_receiver/browser/bindings_message_port_connector.h"
#include "components/cast_receiver/common/public/status.h"
#include "third_party/blink/public/common/messaging/message_port_descriptor.h"
namespace cast_receiver {
class MessagePortService;
// This class will be initialized with a set of bindings received during
// application launch and injects them into the app's WebContents when the page
// loads. It then handles connecting PortConnector requests from those bindings
// by making requests to a MessagePort instance. There should be one instance of
// this class for a single WebContents.
class BindingsManager final : public cast_api_bindings::Manager,
public BindingsMessagePortConnector::Client {
public:
// Handles callbacks for state changes in this object.
class Client {
public:
virtual ~Client();
// Called when a non-recoverable error occurs.
virtual void OnError() = 0;
};
// |client| and |message_port_service| are expected to persist for the
// duration of this instance's lifetime.
BindingsManager(Client& client, MessagePortService& message_port_service);
~BindingsManager() override;
BindingsManager(const BindingsManager&) = delete;
BindingsManager(BindingsManager&&) = delete;
BindingsManager& operator=(const BindingsManager&) = delete;
BindingsManager& operator=(BindingsManager&&) = delete;
void AddBinding(std::string_view binding_script);
// Configures the |message_port_connector_| for use with this |web_contents|
// and connects it to the bindings service.
void ConfigureWebContents(content::WebContents* web_contents);
private:
// BindingsMessagePortConnector::Client overrides.
std::vector<ApiBinding> GetAllBindings() override;
void Connect(const std::string& port_name,
blink::MessagePortDescriptor port) override;
void OnError() override;
// cast_api_bindings::Manager overrides.
void AddBinding(std::string_view binding_name,
std::string_view binding_script) override;
int next_script_id_{0};
// Stores all bindings, keyed on the string-based IDs provided by the
// ApiBindings interface.
std::map<std::string, std::string> bindings_;
// Used to open a MessageChannel for connecting API bindings.
std::unique_ptr<BindingsMessagePortConnector> message_port_connector_;
raw_ref<MessagePortService> message_port_service_;
raw_ref<Client> client_;
};
} // namespace cast_receiver
#endif // COMPONENTS_CAST_RECEIVER_BROWSER_BINDINGS_MANAGER_H_
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