root/google_apis/gaia/merge_session_helper.cc

DEFINITIONS

1. request_context_
2. LogIn
3. AddObserver
4. RemoveObserver
5. CancelAll
6. LogOut
7. LogOutInternal
8. LogOutAllAccounts
9. StartLogOutUrlFetch
10. OnUbertokenSuccess
11. OnUbertokenFailure
12. OnMergeSessionSuccess
13. OnMergeSessionFailure
14. StartFetching
15. OnURLFetchComplete
16. SignalComplete
17. HandleNextAccount

// 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 "google_apis/gaia/merge_session_helper.h"

#include "google_apis/gaia/gaia_auth_fetcher.h"
#include "google_apis/gaia/gaia_constants.h"
#include "google_apis/gaia/gaia_urls.h"
#include "google_apis/gaia/oauth2_token_service.h"
#include "net/url_request/url_fetcher.h"
#include "net/url_request/url_fetcher_delegate.h"

MergeSessionHelper::MergeSessionHelper(
    OAuth2TokenService* token_service,
    net::URLRequestContextGetter* request_context,
    Observer* observer)
    : token_service_(token_service),
      request_context_(request_context) {
  if (observer)
    AddObserver(observer);
}

MergeSessionHelper::~MergeSessionHelper() {
  DCHECK(accounts_.empty());
}

void MergeSessionHelper::LogIn(const std::string& account_id) {
  DCHECK(!account_id.empty());
  accounts_.push_back(account_id);
  if (accounts_.size() == 1)
    StartFetching();
}

void MergeSessionHelper::AddObserver(Observer* observer) {
  observer_list_.AddObserver(observer);
}

void MergeSessionHelper::RemoveObserver(Observer* observer) {
  observer_list_.RemoveObserver(observer);
}

void MergeSessionHelper::CancelAll() {
  gaia_auth_fetcher_.reset();
  uber_token_fetcher_.reset();
  accounts_.clear();
}

void MergeSessionHelper::LogOut(
    const std::string& account_id,
    const std::vector<std::string>& accounts) {
  DCHECK(!account_id.empty());
  LogOutInternal(account_id, accounts);
}

void MergeSessionHelper::LogOutInternal(
    const std::string& account_id,
    const std::vector<std::string>& accounts) {
  bool pending = !accounts_.empty();

  if (pending) {
    for (std::deque<std::string>::const_iterator it = accounts_.begin() + 1;
        it != accounts_.end(); it++) {
      if (!it->empty() &&
          (std::find(accounts.begin(), accounts.end(), *it) == accounts.end() ||
           *it == account_id)) {
        // We have a pending log in request for an account followed by
        // a signout.
        GoogleServiceAuthError error(GoogleServiceAuthError::REQUEST_CANCELED);
        SignalComplete(*it, error);
      }
    }

    // Remove every thing in the work list besides the one that is running.
    accounts_.resize(1);
  }

  // Signal a logout to be the next thing to do unless the pending
  // action is already a logout.
  if (!pending || !accounts_.front().empty())
    accounts_.push_back("");

  for (std::vector<std::string>::const_iterator it = accounts.begin();
      it != accounts.end(); it++) {
    if (*it != account_id) {
      DCHECK(!it->empty());
      accounts_.push_back(*it);
    }
  }

  if (!pending)
    StartLogOutUrlFetch();
}

void MergeSessionHelper::LogOutAllAccounts() {
  LogOutInternal("", std::vector<std::string>());
}

void MergeSessionHelper::StartLogOutUrlFetch() {
  DCHECK(accounts_.front().empty());
  GURL logout_url(GaiaUrls::GetInstance()->service_logout_url());
  net::URLFetcher* fetcher =
      net::URLFetcher::Create(logout_url, net::URLFetcher::GET, this);
  fetcher->SetRequestContext(request_context_);
  fetcher->Start();
}

void MergeSessionHelper::OnUbertokenSuccess(const std::string& uber_token) {
  VLOG(1) << "MergeSessionHelper::OnUbertokenSuccess"
          << " account=" << accounts_.front();
  gaia_auth_fetcher_.reset(new GaiaAuthFetcher(this,
                                               GaiaConstants::kChromeSource,
                                               request_context_));
  gaia_auth_fetcher_->StartMergeSession(uber_token);
}

void MergeSessionHelper::OnUbertokenFailure(
    const GoogleServiceAuthError& error) {
  VLOG(1) << "Failed to retrieve ubertoken"
          << " account=" << accounts_.front()
          << " error=" << error.ToString();
  const std::string account_id = accounts_.front();
  HandleNextAccount();
  SignalComplete(account_id, error);
}

void MergeSessionHelper::OnMergeSessionSuccess(const std::string& data) {
  DVLOG(1) << "MergeSession successful account=" << accounts_.front();
  const std::string account_id = accounts_.front();
  HandleNextAccount();
  SignalComplete(account_id, GoogleServiceAuthError::AuthErrorNone());
}

void MergeSessionHelper::OnMergeSessionFailure(
    const GoogleServiceAuthError& error) {
  VLOG(1) << "Failed MergeSession"
          << " account=" << accounts_.front()
          << " error=" << error.ToString();
  const std::string account_id = accounts_.front();
  HandleNextAccount();
  SignalComplete(account_id, error);
}

void MergeSessionHelper::StartFetching() {
  uber_token_fetcher_.reset(new UbertokenFetcher(token_service_,
                                                 this,
                                                 request_context_));
  uber_token_fetcher_->StartFetchingToken(accounts_.front());
}

void MergeSessionHelper::OnURLFetchComplete(const net::URLFetcher* source) {
  DCHECK(accounts_.front().empty());
  HandleNextAccount();
}

void MergeSessionHelper::SignalComplete(
    const std::string& account_id,
    const GoogleServiceAuthError& error) {
  // Its possible for the observer to delete |this| object.  Don't access
  // access any members after this calling the observer.  This method should
  // be the last call in any other method.
  FOR_EACH_OBSERVER(Observer, observer_list_,
                    MergeSessionCompleted(account_id, error));
}

void MergeSessionHelper::HandleNextAccount() {
  accounts_.pop_front();
  gaia_auth_fetcher_.reset();
  if (accounts_.empty()) {
    uber_token_fetcher_.reset();
  } else {
    if (accounts_.front().empty()) {
      StartLogOutUrlFetch();
    } else {
      StartFetching();
    }
  }
}