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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.
#include "remoting/host/signaling_connector.h"
#include "base/bind.h"
#include "base/callback.h"
#include "google_apis/google_api_keys.h"
#include "net/url_request/url_fetcher.h"
#include "net/url_request/url_request_context_getter.h"
#include "remoting/host/dns_blackhole_checker.h"
namespace remoting {
namespace {
// The delay between reconnect attempts will increase exponentially up
// to the maximum specified here.
const int kMaxReconnectDelaySeconds = 10 * 60;
// Time when we we try to update OAuth token before its expiration.
const int kTokenUpdateTimeBeforeExpirySeconds = 60;
} // namespace
SignalingConnector::OAuthCredentials::OAuthCredentials(
const std::string& login_value,
const std::string& refresh_token_value)
: login(login_value),
refresh_token(refresh_token_value) {
}
SignalingConnector::SignalingConnector(
XmppSignalStrategy* signal_strategy,
scoped_refptr<net::URLRequestContextGetter> url_request_context_getter,
scoped_ptr<DnsBlackholeChecker> dns_blackhole_checker,
const base::Closure& auth_failed_callback)
: signal_strategy_(signal_strategy),
url_request_context_getter_(url_request_context_getter),
auth_failed_callback_(auth_failed_callback),
dns_blackhole_checker_(dns_blackhole_checker.Pass()),
reconnect_attempts_(0),
refreshing_oauth_token_(false) {
DCHECK(!auth_failed_callback_.is_null());
DCHECK(dns_blackhole_checker_.get());
net::NetworkChangeNotifier::AddConnectionTypeObserver(this);
net::NetworkChangeNotifier::AddIPAddressObserver(this);
signal_strategy_->AddListener(this);
ScheduleTryReconnect();
}
SignalingConnector::~SignalingConnector() {
signal_strategy_->RemoveListener(this);
net::NetworkChangeNotifier::RemoveConnectionTypeObserver(this);
net::NetworkChangeNotifier::RemoveIPAddressObserver(this);
}
void SignalingConnector::EnableOAuth(
scoped_ptr<OAuthCredentials> oauth_credentials) {
oauth_credentials_ = oauth_credentials.Pass();
gaia_oauth_client_.reset(new gaia::GaiaOAuthClient(
gaia::kGaiaOAuth2Url, url_request_context_getter_));
}
void SignalingConnector::OnSignalStrategyStateChange(
SignalStrategy::State state) {
DCHECK(CalledOnValidThread());
if (state == SignalStrategy::CONNECTED) {
LOG(INFO) << "Signaling connected.";
reconnect_attempts_ = 0;
} else if (state == SignalStrategy::DISCONNECTED) {
LOG(INFO) << "Signaling disconnected.";
reconnect_attempts_++;
// If authentication failed then we have an invalid OAuth token,
// inform the upper layer about it.
if (signal_strategy_->GetError() == SignalStrategy::AUTHENTICATION_FAILED) {
auth_failed_callback_.Run();
} else {
ScheduleTryReconnect();
}
}
}
bool SignalingConnector::OnSignalStrategyIncomingStanza(
const buzz::XmlElement* stanza) {
return false;
}
void SignalingConnector::OnConnectionTypeChanged(
net::NetworkChangeNotifier::ConnectionType type) {
DCHECK(CalledOnValidThread());
if (type != net::NetworkChangeNotifier::CONNECTION_NONE) {
LOG(INFO) << "Network state changed to online.";
ResetAndTryReconnect();
}
}
void SignalingConnector::OnIPAddressChanged() {
DCHECK(CalledOnValidThread());
LOG(INFO) << "IP address has changed.";
ResetAndTryReconnect();
}
void SignalingConnector::OnGetTokensResponse(const std::string& user_email,
const std::string& access_token,
int expires_seconds) {
NOTREACHED();
}
void SignalingConnector::OnRefreshTokenResponse(
const std::string& access_token,
int expires_seconds) {
DCHECK(CalledOnValidThread());
DCHECK(oauth_credentials_.get());
LOG(INFO) << "Received OAuth token.";
oauth_access_token_ = access_token;
auth_token_expiry_time_ = base::Time::Now() +
base::TimeDelta::FromSeconds(expires_seconds) -
base::TimeDelta::FromSeconds(kTokenUpdateTimeBeforeExpirySeconds);
gaia_oauth_client_->GetUserInfo(access_token, 1, this);
}
void SignalingConnector::OnGetUserInfoResponse(const std::string& user_email) {
DCHECK(CalledOnValidThread());
DCHECK(oauth_credentials_.get());
LOG(INFO) << "Received user info.";
if (user_email != oauth_credentials_->login) {
LOG(ERROR) << "OAuth token and email address do not refer to "
"the same account.";
auth_failed_callback_.Run();
return;
}
signal_strategy_->SetAuthInfo(oauth_credentials_->login,
oauth_access_token_, "oauth2");
refreshing_oauth_token_ = false;
// Now that we've refreshed the token and verified that it's for the correct
// user account, try to connect using the new token.
DCHECK_EQ(signal_strategy_->GetState(), SignalStrategy::DISCONNECTED);
signal_strategy_->Connect();
}
void SignalingConnector::OnOAuthError() {
DCHECK(CalledOnValidThread());
LOG(ERROR) << "OAuth: invalid credentials.";
refreshing_oauth_token_ = false;
reconnect_attempts_++;
auth_failed_callback_.Run();
}
void SignalingConnector::OnNetworkError(int response_code) {
DCHECK(CalledOnValidThread());
LOG(ERROR) << "Network error when trying to update OAuth token: "
<< response_code;
refreshing_oauth_token_ = false;
reconnect_attempts_++;
ScheduleTryReconnect();
}
void SignalingConnector::ScheduleTryReconnect() {
DCHECK(CalledOnValidThread());
if (timer_.IsRunning() || net::NetworkChangeNotifier::IsOffline())
return;
int delay_s = std::min(1 << reconnect_attempts_,
kMaxReconnectDelaySeconds);
timer_.Start(FROM_HERE, base::TimeDelta::FromSeconds(delay_s),
this, &SignalingConnector::TryReconnect);
}
void SignalingConnector::ResetAndTryReconnect() {
DCHECK(CalledOnValidThread());
signal_strategy_->Disconnect();
reconnect_attempts_ = 0;
timer_.Stop();
ScheduleTryReconnect();
}
void SignalingConnector::TryReconnect() {
DCHECK(CalledOnValidThread());
DCHECK(dns_blackhole_checker_.get());
// This will check if this machine is allowed to access the chromoting
// host talkgadget.
dns_blackhole_checker_->CheckForDnsBlackhole(
base::Bind(&SignalingConnector::OnDnsBlackholeCheckerDone,
base::Unretained(this)));
}
void SignalingConnector::OnDnsBlackholeCheckerDone(bool allow) {
DCHECK(CalledOnValidThread());
// Unable to access the host talkgadget. Don't allow the connection, but
// schedule a reconnect in case this is a transient problem rather than
// an outright block.
if (!allow) {
reconnect_attempts_++;
LOG(INFO) << "Talkgadget check failed. Scheduling reconnect. Attempt "
<< reconnect_attempts_;
ScheduleTryReconnect();
return;
}
if (signal_strategy_->GetState() == SignalStrategy::DISCONNECTED) {
bool need_new_auth_token = oauth_credentials_.get() &&
(auth_token_expiry_time_.is_null() ||
base::Time::Now() >= auth_token_expiry_time_);
if (need_new_auth_token) {
RefreshOAuthToken();
} else {
LOG(INFO) << "Attempting to connect signaling.";
signal_strategy_->Connect();
}
}
}
void SignalingConnector::RefreshOAuthToken() {
DCHECK(CalledOnValidThread());
LOG(INFO) << "Refreshing OAuth token.";
DCHECK(!refreshing_oauth_token_);
gaia::OAuthClientInfo client_info = {
google_apis::GetOAuth2ClientID(google_apis::CLIENT_REMOTING),
google_apis::GetOAuth2ClientSecret(google_apis::CLIENT_REMOTING),
// Redirect URL is only used when getting tokens from auth code. It
// is not required when getting access tokens.
""
};
refreshing_oauth_token_ = true;
gaia_oauth_client_->RefreshToken(
client_info, oauth_credentials_->refresh_token, 1, this);
}
} // namespace remoting
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