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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/gaia_oauth_client.h"
#include "base/bind.h"
#include "base/compiler_specific.h"
#include "base/json/json_reader.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/values.h"
#include "googleurl/src/gurl.h"
#include "net/base/escape.h"
#include "net/http/http_status_code.h"
#include "net/url_request/url_fetcher.h"
#include "net/url_request/url_fetcher_delegate.h"
#include "net/url_request/url_request_context_getter.h"
#include "net/url_request/url_request_status.h"
namespace {
const char kDefaultOAuth2TokenUrl[] =
"https://accounts.google.com/o/oauth2/token";
const char kDefaultOAuth2UserInfoUrl[] =
"https://www.googleapis.com/oauth2/v1/userinfo";
// Values used to parse token response.
const char kAccessTokenValue[] = "access_token";
const char kRefreshTokenValue[] = "refresh_token";
const char kExpiresInValue[] = "expires_in";
// Values used when parsing userinfo response.
const char kEmailValue[] = "email";
} // namespace
namespace remoting {
// static
OAuthProviderInfo OAuthProviderInfo::GetDefault() {
OAuthProviderInfo result;
result.access_token_url = kDefaultOAuth2TokenUrl;
result.user_info_url = kDefaultOAuth2UserInfoUrl;
return result;
}
class GaiaOAuthClient::Core
: public base::RefCountedThreadSafe<GaiaOAuthClient::Core>,
public net::URLFetcherDelegate {
public:
Core(const OAuthProviderInfo& info,
net::URLRequestContextGetter* request_context_getter)
: provider_info_(info),
request_context_getter_(request_context_getter),
delegate_(NULL),
url_fetcher_type_(URL_FETCHER_NONE) {
}
void RefreshToken(const OAuthClientInfo& oauth_client_info,
const std::string& refresh_token,
GaiaOAuthClient::Delegate* delegate);
// net::URLFetcherDelegate interface
virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
private:
friend class base::RefCountedThreadSafe<Core>;
enum URLFetcherType {
URL_FETCHER_NONE,
URL_FETCHER_REFRESH_TOKEN,
URL_FETCHER_GET_USER_INFO
};
virtual ~Core() {}
void OnAuthTokenFetchComplete(const net::URLRequestStatus& status,
int response_code,
const std::string& response);
void FetchUserInfoAndInvokeCallback();
void OnUserInfoFetchComplete(const net::URLRequestStatus& status,
int response_code,
const std::string& response);
OAuthProviderInfo provider_info_;
scoped_refptr<net::URLRequestContextGetter> request_context_getter_;
GaiaOAuthClient::Delegate* delegate_;
scoped_ptr<net::URLFetcher> request_;
URLFetcherType url_fetcher_type_;
std::string access_token_;
int expires_in_seconds_;
};
void GaiaOAuthClient::Core::RefreshToken(
const OAuthClientInfo& oauth_client_info,
const std::string& refresh_token,
GaiaOAuthClient::Delegate* delegate) {
DCHECK(!request_.get()) << "Tried to fetch two things at once!";
delegate_ = delegate;
access_token_.clear();
expires_in_seconds_ = 0;
std::string post_body =
"refresh_token=" + net::EscapeUrlEncodedData(refresh_token, true) +
"&client_id=" + net::EscapeUrlEncodedData(oauth_client_info.client_id,
true) +
"&client_secret=" +
net::EscapeUrlEncodedData(oauth_client_info.client_secret, true) +
"&grant_type=refresh_token";
request_.reset(net::URLFetcher::Create(
GURL(provider_info_.access_token_url), net::URLFetcher::POST, this));
request_->SetRequestContext(request_context_getter_);
request_->SetUploadData("application/x-www-form-urlencoded", post_body);
url_fetcher_type_ = URL_FETCHER_REFRESH_TOKEN;
request_->Start();
}
void GaiaOAuthClient::Core::OnURLFetchComplete(
const net::URLFetcher* source) {
std::string response_string;
source->GetResponseAsString(&response_string);
switch (url_fetcher_type_) {
case URL_FETCHER_REFRESH_TOKEN:
OnAuthTokenFetchComplete(source->GetStatus(),
source->GetResponseCode(),
response_string);
break;
case URL_FETCHER_GET_USER_INFO:
OnUserInfoFetchComplete(source->GetStatus(),
source->GetResponseCode(),
response_string);
break;
default:
LOG(ERROR) << "Unrecognised URLFetcher type: " << url_fetcher_type_;
}
}
void GaiaOAuthClient::Core::OnAuthTokenFetchComplete(
const net::URLRequestStatus& status,
int response_code,
const std::string& response) {
request_.reset();
if (!status.is_success()) {
delegate_->OnNetworkError(response_code);
return;
}
// HTTP_BAD_REQUEST means the arguments are invalid.
if (response_code == net::HTTP_BAD_REQUEST) {
LOG(ERROR) << "Gaia response: response code=net::HTTP_BAD_REQUEST.";
delegate_->OnOAuthError();
return;
}
if (response_code == net::HTTP_OK) {
scoped_ptr<Value> message_value(base::JSONReader::Read(response));
if (message_value.get() &&
message_value->IsType(Value::TYPE_DICTIONARY)) {
scoped_ptr<DictionaryValue> response_dict(
static_cast<DictionaryValue*>(message_value.release()));
std::string access_token;
response_dict->GetString(kAccessTokenValue, &access_token);
if (access_token.find("\r\n") != std::string::npos) {
LOG(ERROR) << "Gaia response: access token include CRLF";
delegate_->OnOAuthError();
return;
}
access_token_ = access_token;
response_dict->GetInteger(kExpiresInValue, &expires_in_seconds_);
}
VLOG(1) << "Gaia response: acess_token='" << access_token_
<< "', expires in " << expires_in_seconds_ << " second(s)";
} else {
LOG(ERROR) << "Gaia response: response code=" << response_code;
}
if (access_token_.empty()) {
delegate_->OnNetworkError(response_code);
} else {
FetchUserInfoAndInvokeCallback();
}
}
void GaiaOAuthClient::Core::FetchUserInfoAndInvokeCallback() {
request_.reset(net::URLFetcher::Create(
GURL(provider_info_.user_info_url), net::URLFetcher::GET, this));
request_->SetRequestContext(request_context_getter_);
request_->AddExtraRequestHeader("Authorization: Bearer " + access_token_);
url_fetcher_type_ = URL_FETCHER_GET_USER_INFO;
request_->Start();
}
void GaiaOAuthClient::Core::OnUserInfoFetchComplete(
const net::URLRequestStatus& status,
int response_code,
const std::string& response) {
request_.reset();
url_fetcher_type_ = URL_FETCHER_NONE;
std::string email;
if (response_code == net::HTTP_OK) {
scoped_ptr<Value> message_value(base::JSONReader::Read(response));
if (message_value.get() &&
message_value->IsType(Value::TYPE_DICTIONARY)) {
scoped_ptr<DictionaryValue> response_dict(
static_cast<DictionaryValue*>(message_value.release()));
response_dict->GetString(kEmailValue, &email);
}
}
if (email.empty()) {
delegate_->OnNetworkError(response_code);
} else {
delegate_->OnRefreshTokenResponse(
email, access_token_, expires_in_seconds_);
}
}
GaiaOAuthClient::GaiaOAuthClient(const OAuthProviderInfo& provider_info,
net::URLRequestContextGetter* context_getter) {
core_ = new Core(provider_info, context_getter);
}
GaiaOAuthClient::~GaiaOAuthClient() {
}
void GaiaOAuthClient::RefreshToken(const OAuthClientInfo& oauth_client_info,
const std::string& refresh_token,
Delegate* delegate) {
return core_->RefreshToken(oauth_client_info,
refresh_token,
delegate);
}
} // namespace remoting
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