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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 "google_apis/gaia/oauth2_access_token_fetcher.h"
#include <algorithm>
#include <string>
#include <vector>
#include "base/json/json_reader.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/time/time.h"
#include "base/values.h"
#include "google_apis/gaia/gaia_urls.h"
#include "google_apis/gaia/google_service_auth_error.h"
#include "net/base/escape.h"
#include "net/base/load_flags.h"
#include "net/http/http_status_code.h"
#include "net/url_request/url_fetcher.h"
#include "net/url_request/url_request_context_getter.h"
#include "net/url_request/url_request_status.h"
using net::ResponseCookies;
using net::URLFetcher;
using net::URLFetcherDelegate;
using net::URLRequestContextGetter;
using net::URLRequestStatus;
namespace {
static const char kGetAccessTokenBodyFormat[] =
"client_id=%s&"
"client_secret=%s&"
"grant_type=refresh_token&"
"refresh_token=%s";
static const char kGetAccessTokenBodyWithScopeFormat[] =
"client_id=%s&"
"client_secret=%s&"
"grant_type=refresh_token&"
"refresh_token=%s&"
"scope=%s";
static const char kAccessTokenKey[] = "access_token";
static const char kExpiresInKey[] = "expires_in";
static GoogleServiceAuthError CreateAuthError(URLRequestStatus status) {
CHECK(!status.is_success());
if (status.status() == URLRequestStatus::CANCELED) {
return GoogleServiceAuthError(GoogleServiceAuthError::REQUEST_CANCELED);
} else {
DLOG(WARNING) << "Could not reach Google Accounts servers: errno "
<< status.error();
return GoogleServiceAuthError::FromConnectionError(status.error());
}
}
static URLFetcher* CreateFetcher(URLRequestContextGetter* getter,
const GURL& url,
const std::string& body,
URLFetcherDelegate* delegate) {
bool empty_body = body.empty();
URLFetcher* result = net::URLFetcher::Create(
0, url,
empty_body ? URLFetcher::GET : URLFetcher::POST,
delegate);
result->SetRequestContext(getter);
result->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
net::LOAD_DO_NOT_SAVE_COOKIES);
// Fetchers are sometimes cancelled because a network change was detected,
// especially at startup and after sign-in on ChromeOS. Retrying once should
// be enough in those cases; let the fetcher retry up to 3 times just in case.
// http://crbug.com/163710
result->SetAutomaticallyRetryOnNetworkChanges(3);
if (!empty_body)
result->SetUploadData("application/x-www-form-urlencoded", body);
return result;
}
} // namespace
OAuth2AccessTokenFetcher::OAuth2AccessTokenFetcher(
OAuth2AccessTokenConsumer* consumer,
URLRequestContextGetter* getter)
: consumer_(consumer),
getter_(getter),
state_(INITIAL) { }
OAuth2AccessTokenFetcher::~OAuth2AccessTokenFetcher() { }
void OAuth2AccessTokenFetcher::CancelRequest() {
fetcher_.reset();
}
void OAuth2AccessTokenFetcher::Start(const std::string& client_id,
const std::string& client_secret,
const std::string& refresh_token,
const std::vector<std::string>& scopes) {
client_id_ = client_id;
client_secret_ = client_secret;
refresh_token_ = refresh_token;
scopes_ = scopes;
StartGetAccessToken();
}
void OAuth2AccessTokenFetcher::StartGetAccessToken() {
CHECK_EQ(INITIAL, state_);
state_ = GET_ACCESS_TOKEN_STARTED;
fetcher_.reset(CreateFetcher(
getter_,
MakeGetAccessTokenUrl(),
MakeGetAccessTokenBody(
client_id_, client_secret_, refresh_token_, scopes_),
this));
fetcher_->Start(); // OnURLFetchComplete will be called.
}
void OAuth2AccessTokenFetcher::EndGetAccessToken(
const net::URLFetcher* source) {
CHECK_EQ(GET_ACCESS_TOKEN_STARTED, state_);
state_ = GET_ACCESS_TOKEN_DONE;
URLRequestStatus status = source->GetStatus();
if (!status.is_success()) {
OnGetTokenFailure(CreateAuthError(status));
return;
}
// HTTP_FORBIDDEN (403) is treated as temporary error, because it may be
// '403 Rate Limit Exeeded.'
if (source->GetResponseCode() == net::HTTP_FORBIDDEN) {
OnGetTokenFailure(GoogleServiceAuthError(
GoogleServiceAuthError::SERVICE_UNAVAILABLE));
return;
}
// The other errors are treated as permanent error.
if (source->GetResponseCode() != net::HTTP_OK) {
OnGetTokenFailure(GoogleServiceAuthError(
GoogleServiceAuthError::INVALID_GAIA_CREDENTIALS));
return;
}
// The request was successfully fetched and it returned OK.
// Parse out the access token and the expiration time.
std::string access_token;
int expires_in;
if (!ParseGetAccessTokenResponse(source, &access_token, &expires_in)) {
DLOG(WARNING) << "Response doesn't match expected format";
OnGetTokenFailure(
GoogleServiceAuthError(GoogleServiceAuthError::SERVICE_UNAVAILABLE));
return;
}
// The token will expire in |expires_in| seconds. Take a 10% error margin to
// prevent reusing a token too close to its expiration date.
OnGetTokenSuccess(
access_token,
base::Time::Now() + base::TimeDelta::FromSeconds(9 * expires_in / 10));
}
void OAuth2AccessTokenFetcher::OnGetTokenSuccess(
const std::string& access_token,
const base::Time& expiration_time) {
consumer_->OnGetTokenSuccess(access_token, expiration_time);
}
void OAuth2AccessTokenFetcher::OnGetTokenFailure(
const GoogleServiceAuthError& error) {
state_ = ERROR_STATE;
consumer_->OnGetTokenFailure(error);
}
void OAuth2AccessTokenFetcher::OnURLFetchComplete(
const net::URLFetcher* source) {
CHECK(source);
CHECK(state_ == GET_ACCESS_TOKEN_STARTED);
EndGetAccessToken(source);
}
// static
GURL OAuth2AccessTokenFetcher::MakeGetAccessTokenUrl() {
return GaiaUrls::GetInstance()->oauth2_token_url();
}
// static
std::string OAuth2AccessTokenFetcher::MakeGetAccessTokenBody(
const std::string& client_id,
const std::string& client_secret,
const std::string& refresh_token,
const std::vector<std::string>& scopes) {
std::string enc_client_id = net::EscapeUrlEncodedData(client_id, true);
std::string enc_client_secret =
net::EscapeUrlEncodedData(client_secret, true);
std::string enc_refresh_token =
net::EscapeUrlEncodedData(refresh_token, true);
if (scopes.empty()) {
return base::StringPrintf(
kGetAccessTokenBodyFormat,
enc_client_id.c_str(),
enc_client_secret.c_str(),
enc_refresh_token.c_str());
} else {
std::string scopes_string = JoinString(scopes, ' ');
return base::StringPrintf(
kGetAccessTokenBodyWithScopeFormat,
enc_client_id.c_str(),
enc_client_secret.c_str(),
enc_refresh_token.c_str(),
net::EscapeUrlEncodedData(scopes_string, true).c_str());
}
}
// static
bool OAuth2AccessTokenFetcher::ParseGetAccessTokenResponse(
const net::URLFetcher* source,
std::string* access_token,
int* expires_in) {
CHECK(source);
CHECK(access_token);
std::string data;
source->GetResponseAsString(&data);
scoped_ptr<base::Value> value(base::JSONReader::Read(data));
if (!value.get() || value->GetType() != base::Value::TYPE_DICTIONARY)
return false;
base::DictionaryValue* dict =
static_cast<base::DictionaryValue*>(value.get());
return dict->GetString(kAccessTokenKey, access_token) &&
dict->GetInteger(kExpiresInKey, expires_in);
}
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