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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_api_call_flow.h"
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/stringprintf.h"
#include "google_apis/gaia/gaia_urls.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 kAuthorizationHeaderFormat[] =
"Authorization: Bearer %s";
static std::string MakeAuthorizationHeader(const std::string& auth_token) {
return base::StringPrintf(kAuthorizationHeaderFormat, auth_token.c_str());
}
} // namespace
OAuth2ApiCallFlow::OAuth2ApiCallFlow(
net::URLRequestContextGetter* context,
const std::string& refresh_token,
const std::string& access_token,
const std::vector<std::string>& scopes)
: context_(context),
refresh_token_(refresh_token),
access_token_(access_token),
scopes_(scopes),
state_(INITIAL),
tried_mint_access_token_(false) {
}
OAuth2ApiCallFlow::~OAuth2ApiCallFlow() {}
void OAuth2ApiCallFlow::Start() {
BeginApiCall();
}
void OAuth2ApiCallFlow::BeginApiCall() {
CHECK(state_ == INITIAL || state_ == MINT_ACCESS_TOKEN_DONE);
// If the access token is empty then directly try to mint one.
if (access_token_.empty()) {
BeginMintAccessToken();
} else {
state_ = API_CALL_STARTED;
url_fetcher_.reset(CreateURLFetcher());
url_fetcher_->Start(); // OnURLFetchComplete will be called.
}
}
void OAuth2ApiCallFlow::EndApiCall(const net::URLFetcher* source) {
CHECK_EQ(API_CALL_STARTED, state_);
state_ = API_CALL_DONE;
URLRequestStatus status = source->GetStatus();
if (!status.is_success()) {
state_ = ERROR_STATE;
ProcessApiCallFailure(source);
return;
}
// If the response code is 401 Unauthorized then access token may have
// expired. So try generating a new access token.
if (source->GetResponseCode() == net::HTTP_UNAUTHORIZED) {
// If we already tried minting a new access token, don't do it again.
if (tried_mint_access_token_) {
state_ = ERROR_STATE;
ProcessApiCallFailure(source);
} else {
BeginMintAccessToken();
}
return;
}
if (source->GetResponseCode() != net::HTTP_OK) {
state_ = ERROR_STATE;
ProcessApiCallFailure(source);
return;
}
ProcessApiCallSuccess(source);
}
void OAuth2ApiCallFlow::BeginMintAccessToken() {
CHECK(state_ == INITIAL || state_ == API_CALL_DONE);
CHECK(!tried_mint_access_token_);
state_ = MINT_ACCESS_TOKEN_STARTED;
tried_mint_access_token_ = true;
oauth2_access_token_fetcher_.reset(CreateAccessTokenFetcher());
oauth2_access_token_fetcher_->Start(
GaiaUrls::GetInstance()->oauth2_chrome_client_id(),
GaiaUrls::GetInstance()->oauth2_chrome_client_secret(),
refresh_token_,
scopes_);
}
void OAuth2ApiCallFlow::EndMintAccessToken(
const GoogleServiceAuthError* error) {
CHECK_EQ(MINT_ACCESS_TOKEN_STARTED, state_);
if (!error) {
state_ = MINT_ACCESS_TOKEN_DONE;
BeginApiCall();
} else {
state_ = ERROR_STATE;
ProcessMintAccessTokenFailure(*error);
}
}
OAuth2AccessTokenFetcher* OAuth2ApiCallFlow::CreateAccessTokenFetcher() {
return new OAuth2AccessTokenFetcher(this, context_);
}
void OAuth2ApiCallFlow::OnURLFetchComplete(const net::URLFetcher* source) {
CHECK(source);
CHECK_EQ(API_CALL_STARTED, state_);
EndApiCall(source);
}
void OAuth2ApiCallFlow::OnGetTokenSuccess(const std::string& access_token,
const base::Time& expiration_time) {
access_token_ = access_token;
EndMintAccessToken(NULL);
}
void OAuth2ApiCallFlow::OnGetTokenFailure(
const GoogleServiceAuthError& error) {
EndMintAccessToken(&error);
}
URLFetcher* OAuth2ApiCallFlow::CreateURLFetcher() {
std::string body = CreateApiCallBody();
bool empty_body = body.empty();
URLFetcher* result = net::URLFetcher::Create(
0,
CreateApiCallUrl(),
empty_body ? URLFetcher::GET : URLFetcher::POST,
this);
result->SetRequestContext(context_);
result->SetLoadFlags(net::LOAD_DO_NOT_SEND_COOKIES |
net::LOAD_DO_NOT_SAVE_COOKIES);
result->AddExtraRequestHeader(MakeAuthorizationHeader(access_token_));
// 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;
}
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