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// Copyright 2016 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_PROTOCOL_VALIDATING_AUTHENTICATOR_H_
#define REMOTING_PROTOCOL_VALIDATING_AUTHENTICATOR_H_
#include <memory>
#include <string>
#include "base/functional/callback.h"
#include "base/memory/weak_ptr.h"
#include "remoting/protocol/authenticator.h"
namespace remoting::protocol {
// This authenticator class provides a way to check the validity of a connection
// as it is being established through an asynchronous callback. The validation
// logic supplied by the caller is run once the underlying authenticator(s) have
// accepted the connection.
class ValidatingAuthenticator : public Authenticator {
public:
enum class Result {
SUCCESS,
ERROR_INVALID_CREDENTIALS,
ERROR_INVALID_ACCOUNT,
ERROR_REJECTED_BY_USER,
ERROR_TOO_MANY_CONNECTIONS,
ERROR_UNAUTHORIZED_ACCOUNT
};
typedef base::OnceCallback<void(Result validation_result)> ResultCallback;
typedef base::RepeatingCallback<void(const std::string& remote_jid,
ResultCallback callback)>
ValidationCallback;
ValidatingAuthenticator(const std::string& remote_jid,
const ValidationCallback& validation_callback,
std::unique_ptr<Authenticator> current_authenticator);
ValidatingAuthenticator(const ValidatingAuthenticator&) = delete;
ValidatingAuthenticator& operator=(const ValidatingAuthenticator&) = delete;
~ValidatingAuthenticator() override;
// Authenticator interface.
CredentialsType credentials_type() const override;
const Authenticator& implementing_authenticator() const override;
State state() const override;
bool started() const override;
RejectionReason rejection_reason() const override;
RejectionDetails rejection_details() const override;
const std::string& GetAuthKey() const override;
const SessionPolicies* GetSessionPolicies() const override;
std::unique_ptr<ChannelAuthenticator> CreateChannelAuthenticator()
const override;
void ProcessMessage(const jingle_xmpp::XmlElement* message,
base::OnceClosure resume_callback) override;
std::unique_ptr<jingle_xmpp::XmlElement> GetNextMessage() override;
private:
// Checks |result|. If the connection was rejected, |state_| and
// |rejection_reason_| are updated. |callback| is always run.
void OnValidateComplete(base::OnceClosure callback, Result result);
// Updates |state_| to reflect the current underlying authenticator state.
// |resume_callback| is called after the state is updated.
void UpdateState(base::OnceClosure resume_callback);
void NotifyStateChangeAfterAccepted() override;
// The JID of the remote user.
std::string remote_jid_;
// Called for validation of incoming connection requests.
ValidationCallback validation_callback_;
// Returns the current state of the authenticator.
State state_ = Authenticator::WAITING_MESSAGE;
// Returns the rejection reason. Can be called only when in REJECTED state.
RejectionReason rejection_reason_ =
Authenticator::RejectionReason::INVALID_CREDENTIALS;
RejectionDetails rejection_details_;
std::unique_ptr<Authenticator> current_authenticator_;
std::unique_ptr<jingle_xmpp::XmlElement> pending_auth_message_;
base::WeakPtrFactory<ValidatingAuthenticator> weak_factory_{this};
};
} // namespace remoting::protocol
#endif // REMOTING_PROTOCOL_VALIDATING_AUTHENTICATOR_H_
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