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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef REMOTING_HOST_HOST_EXTENSION_SESSION_MANAGER_H_
#define REMOTING_HOST_HOST_EXTENSION_SESSION_MANAGER_H_
#include <memory>
#include <string>
#include <vector>
#include "base/containers/flat_map.h"
#include "base/memory/raw_ptr.h"
namespace remoting {
class ClientSessionDetails;
class HostExtension;
class HostExtensionSession;
namespace protocol {
class ClientStub;
class ExtensionMessage;
} // namespace protocol
// Helper class used to create and manage a set of HostExtensionSession
// instances depending upon the set of registered HostExtensions, and the
// set of capabilities negotiated between client and host.
class HostExtensionSessionManager {
public:
using HostExtensions =
std::vector<raw_ptr<HostExtension, VectorExperimental>>;
// Creates an extension manager for the specified |extensions|.
HostExtensionSessionManager(const HostExtensions& extensions,
ClientSessionDetails* client_session_details);
HostExtensionSessionManager(const HostExtensionSessionManager&) = delete;
HostExtensionSessionManager& operator=(const HostExtensionSessionManager&) =
delete;
virtual ~HostExtensionSessionManager();
// Returns the union of all capabilities supported by registered extensions.
std::string GetCapabilities() const;
// Finds an extension session with the matching capability. Returns nullptr if
// the extension session is not found, or capability negotiation has not
// completed.
HostExtensionSession* FindExtensionSession(const std::string& capability);
// Handles completion of authentication and capabilities negotiation, creating
// the set of HostExtensionSessions to match the client's capabilities.
void OnNegotiatedCapabilities(protocol::ClientStub* client_stub,
const std::string& capabilities);
// Passes |message| to each HostExtensionSession in turn until the message
// is handled, or none remain. Returns true if the message was handled.
// It is not valid for more than one extension to handle the same message.
bool OnExtensionMessage(const protocol::ExtensionMessage& message);
private:
using HostExtensionSessions =
base::flat_map</* capability */ std::string,
std::unique_ptr<HostExtensionSession>>;
// Passed to HostExtensionSessions to allow them to send messages,
// disconnect the session, etc.
raw_ptr<ClientSessionDetails> client_session_details_;
raw_ptr<protocol::ClientStub> client_stub_;
// The HostExtensions to instantiate for the session, if it reaches the
// authenticated state.
HostExtensions extensions_;
// The instantiated HostExtensionSessions, used to handle extension messages.
HostExtensionSessions extension_sessions_;
};
} // namespace remoting
#endif // REMOTING_HOST_HOST_EXTENSION_SESSION_MANAGER_H_
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