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// Copyright (c) 2012 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.
#ifndef REMOTING_HOST_SIGNALING_CONNECTOR_H_
#define REMOTING_HOST_SIGNALING_CONNECTOR_H_
#include "base/basictypes.h"
#include "base/memory/weak_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "base/timer/timer.h"
#include "google_apis/gaia/gaia_oauth_client.h"
#include "net/base/network_change_notifier.h"
#include "remoting/jingle_glue/xmpp_signal_strategy.h"
namespace net {
class URLFetcher;
class URLRequestContextGetter;
} // namespace net
namespace remoting {
class DnsBlackholeChecker;
// SignalingConnector listens for SignalStrategy status notifications
// and attempts to keep it connected when possible. When signalling is
// not connected it keeps trying to reconnect it until it is
// connected. It limits connection attempt rate using exponential
// backoff. It also monitors network state and reconnects signalling
// whenever connection type changes or IP address changes.
class SignalingConnector
: public base::SupportsWeakPtr<SignalingConnector>,
public base::NonThreadSafe,
public SignalStrategy::Listener,
public net::NetworkChangeNotifier::ConnectionTypeObserver,
public net::NetworkChangeNotifier::IPAddressObserver,
public gaia::GaiaOAuthClient::Delegate {
public:
// This structure contains information required to perform
// authentication to OAuth2.
struct OAuthCredentials {
OAuthCredentials(const std::string& login_value,
const std::string& refresh_token_value,
bool is_service_account);
// The user's account name (i.e. their email address).
std::string login;
// Token delegating authority to us to act as the user.
std::string refresh_token;
// Whether these credentials belong to a service account.
bool is_service_account;
};
// The |auth_failed_callback| is called when authentication fails.
SignalingConnector(
XmppSignalStrategy* signal_strategy,
scoped_refptr<net::URLRequestContextGetter> url_request_context_getter,
scoped_ptr<DnsBlackholeChecker> dns_blackhole_checker,
const base::Closure& auth_failed_callback);
virtual ~SignalingConnector();
// May be called immediately after the constructor to enable OAuth
// access token updating.
void EnableOAuth(scoped_ptr<OAuthCredentials> oauth_credentials);
// SignalStrategy::Listener interface.
virtual void OnSignalStrategyStateChange(
SignalStrategy::State state) OVERRIDE;
virtual bool OnSignalStrategyIncomingStanza(
const buzz::XmlElement* stanza) OVERRIDE;
// NetworkChangeNotifier::ConnectionTypeObserver interface.
virtual void OnConnectionTypeChanged(
net::NetworkChangeNotifier::ConnectionType type) OVERRIDE;
// NetworkChangeNotifier::IPAddressObserver interface.
virtual void OnIPAddressChanged() OVERRIDE;
// gaia::GaiaOAuthClient::Delegate interface.
virtual void OnGetTokensResponse(const std::string& user_email,
const std::string& access_token,
int expires_seconds) OVERRIDE;
virtual void OnRefreshTokenResponse(const std::string& access_token,
int expires_in_seconds) OVERRIDE;
virtual void OnGetUserEmailResponse(const std::string& user_email) OVERRIDE;
virtual void OnOAuthError() OVERRIDE;
virtual void OnNetworkError(int response_code) OVERRIDE;
private:
void ScheduleTryReconnect();
void ResetAndTryReconnect();
void TryReconnect();
void OnDnsBlackholeCheckerDone(bool allow);
void RefreshOAuthToken();
XmppSignalStrategy* signal_strategy_;
scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
base::Closure auth_failed_callback_;
scoped_ptr<OAuthCredentials> oauth_credentials_;
scoped_ptr<gaia::GaiaOAuthClient> gaia_oauth_client_;
scoped_ptr<DnsBlackholeChecker> dns_blackhole_checker_;
// Number of times we tried to connect without success.
int reconnect_attempts_;
bool refreshing_oauth_token_;
std::string oauth_access_token_;
base::Time auth_token_expiry_time_;
base::OneShotTimer<SignalingConnector> timer_;
DISALLOW_COPY_AND_ASSIGN(SignalingConnector);
};
} // namespace remoting
#endif // REMOTING_HOST_SIGNALING_CONNECTOR_H_
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