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// Copyright 2014 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/oauth_token_getter_impl.h"
#include <utility>
#include "base/bind.h"
#include "base/callback.h"
#include "base/strings/string_util.h"
#include "google_apis/google_api_keys.h"
#include "net/url_request/url_request_context_getter.h"
#include "remoting/base/logging.h"
namespace remoting {
namespace {
// Maximum number of retries on network/500 errors.
const int kMaxRetries = 3;
// Time when we we try to update OAuth token before its expiration.
const int kTokenUpdateTimeBeforeExpirySeconds = 60;
} // namespace
OAuthTokenGetterImpl::OAuthTokenGetterImpl(
std::unique_ptr<OAuthCredentials> oauth_credentials,
const scoped_refptr<net::URLRequestContextGetter>&
url_request_context_getter,
bool auto_refresh)
: oauth_credentials_(std::move(oauth_credentials)),
gaia_oauth_client_(
new gaia::GaiaOAuthClient(url_request_context_getter.get())),
url_request_context_getter_(url_request_context_getter) {
if (auto_refresh) {
refresh_timer_.reset(new base::OneShotTimer());
}
}
OAuthTokenGetterImpl::~OAuthTokenGetterImpl() {}
void OAuthTokenGetterImpl::OnGetTokensResponse(const std::string& user_email,
const std::string& access_token,
int expires_seconds) {
NOTREACHED();
}
void OAuthTokenGetterImpl::OnRefreshTokenResponse(
const std::string& access_token,
int expires_seconds) {
DCHECK(CalledOnValidThread());
DCHECK(oauth_credentials_.get());
HOST_LOG << "Received OAuth token.";
oauth_access_token_ = access_token;
base::TimeDelta token_expiration =
base::TimeDelta::FromSeconds(expires_seconds) -
base::TimeDelta::FromSeconds(kTokenUpdateTimeBeforeExpirySeconds);
auth_token_expiry_time_ = base::Time::Now() + token_expiration;
if (refresh_timer_) {
refresh_timer_->Stop();
refresh_timer_->Start(FROM_HERE, token_expiration, this,
&OAuthTokenGetterImpl::RefreshOAuthToken);
}
if (!oauth_credentials_->is_service_account && !email_verified_) {
gaia_oauth_client_->GetUserEmail(access_token, kMaxRetries, this);
} else {
refreshing_oauth_token_ = false;
NotifyCallbacks(OAuthTokenGetterImpl::SUCCESS, oauth_credentials_->login,
oauth_access_token_);
}
}
void OAuthTokenGetterImpl::OnGetUserEmailResponse(
const std::string& user_email) {
DCHECK(CalledOnValidThread());
DCHECK(oauth_credentials_.get());
HOST_LOG << "Received user info.";
if (user_email != oauth_credentials_->login) {
LOG(ERROR) << "OAuth token and email address do not refer to "
"the same account.";
OnOAuthError();
return;
}
email_verified_ = true;
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.
NotifyCallbacks(OAuthTokenGetterImpl::SUCCESS, user_email,
oauth_access_token_);
}
void OAuthTokenGetterImpl::NotifyCallbacks(Status status,
const std::string& user_email,
const std::string& access_token) {
std::queue<TokenCallback> callbacks(pending_callbacks_);
pending_callbacks_ = std::queue<TokenCallback>();
while (!callbacks.empty()) {
callbacks.front().Run(status, user_email, access_token);
callbacks.pop();
}
}
void OAuthTokenGetterImpl::OnOAuthError() {
DCHECK(CalledOnValidThread());
LOG(ERROR) << "OAuth: invalid credentials.";
refreshing_oauth_token_ = false;
// Throw away invalid credentials and force a refresh.
oauth_access_token_.clear();
auth_token_expiry_time_ = base::Time();
email_verified_ = false;
NotifyCallbacks(OAuthTokenGetterImpl::AUTH_ERROR, std::string(),
std::string());
}
void OAuthTokenGetterImpl::OnNetworkError(int response_code) {
DCHECK(CalledOnValidThread());
LOG(ERROR) << "Network error when trying to update OAuth token: "
<< response_code;
refreshing_oauth_token_ = false;
NotifyCallbacks(OAuthTokenGetterImpl::NETWORK_ERROR, std::string(),
std::string());
}
void OAuthTokenGetterImpl::CallWithToken(const TokenCallback& on_access_token) {
DCHECK(CalledOnValidThread());
bool need_new_auth_token = auth_token_expiry_time_.is_null() ||
base::Time::Now() >= auth_token_expiry_time_ ||
(!oauth_credentials_->is_service_account &&
!email_verified_);
if (need_new_auth_token) {
pending_callbacks_.push(on_access_token);
if (!refreshing_oauth_token_)
RefreshOAuthToken();
} else {
on_access_token.Run(SUCCESS, oauth_credentials_->login,
oauth_access_token_);
}
}
void OAuthTokenGetterImpl::InvalidateCache() {
DCHECK(CalledOnValidThread());
auth_token_expiry_time_ = base::Time();
}
void OAuthTokenGetterImpl::RefreshOAuthToken() {
DCHECK(CalledOnValidThread());
HOST_LOG << "Refreshing OAuth token.";
DCHECK(!refreshing_oauth_token_);
// Service accounts use different API keys, as they use the client app flow.
google_apis::OAuth2Client oauth2_client =
oauth_credentials_->is_service_account ? google_apis::CLIENT_REMOTING_HOST
: google_apis::CLIENT_REMOTING;
gaia::OAuthClientInfo client_info = {
google_apis::GetOAuth2ClientID(oauth2_client),
google_apis::GetOAuth2ClientSecret(oauth2_client),
// Redirect URL is only used when getting tokens from auth code. It
// is not required when getting access tokens.
""};
refreshing_oauth_token_ = true;
std::vector<std::string> empty_scope_list; // Use scope from refresh token.
gaia_oauth_client_->RefreshToken(client_info,
oauth_credentials_->refresh_token,
empty_scope_list, kMaxRetries, this);
}
} // namespace remoting
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