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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "chrome/browser/chromeos/policy/policy_oauth2_token_fetcher.h"
      6 
      7 #include <vector>
      8 
      9 #include "base/bind.h"
     10 #include "base/logging.h"
     11 #include "base/strings/string_util.h"
     12 #include "content/public/browser/browser_thread.h"
     13 #include "google_apis/gaia/gaia_auth_fetcher.h"
     14 #include "google_apis/gaia/gaia_constants.h"
     15 #include "google_apis/gaia/gaia_urls.h"
     16 #include "google_apis/gaia/google_service_auth_error.h"
     17 #include "google_apis/gaia/oauth2_access_token_fetcher.h"
     18 #include "net/url_request/url_request_context_getter.h"
     19 
     20 using content::BrowserThread;
     21 
     22 namespace policy {
     23 
     24 namespace {
     25 
     26 // Max retry count for token fetching requests.
     27 const int kMaxRequestAttemptCount = 5;
     28 
     29 // OAuth token request retry delay in milliseconds.
     30 const int kRequestRestartDelay = 3000;
     31 
     32 }  // namespace
     33 
     34 PolicyOAuth2TokenFetcher::PolicyOAuth2TokenFetcher(
     35     net::URLRequestContextGetter* auth_context_getter,
     36     net::URLRequestContextGetter* system_context_getter,
     37     const TokenCallback& callback)
     38     : auth_context_getter_(auth_context_getter),
     39       system_context_getter_(system_context_getter),
     40       retry_count_(0),
     41       failed_(false),
     42       callback_(callback) {}
     43 
     44 PolicyOAuth2TokenFetcher::~PolicyOAuth2TokenFetcher() {}
     45 
     46 void PolicyOAuth2TokenFetcher::Start() {
     47   retry_count_ = 0;
     48   StartFetchingRefreshToken();
     49 }
     50 
     51 void PolicyOAuth2TokenFetcher::StartFetchingRefreshToken() {
     52   refresh_token_fetcher_.reset(new GaiaAuthFetcher(
     53       this, GaiaConstants::kChromeSource, auth_context_getter_.get()));
     54   refresh_token_fetcher_->StartCookieForOAuthLoginTokenExchange(EmptyString());
     55 }
     56 
     57 void PolicyOAuth2TokenFetcher::StartFetchingAccessToken() {
     58   std::vector<std::string> scopes;
     59   scopes.push_back(GaiaConstants::kDeviceManagementServiceOAuth);
     60   access_token_fetcher_.reset(
     61       new OAuth2AccessTokenFetcher(this, system_context_getter_.get()));
     62   access_token_fetcher_->Start(
     63       GaiaUrls::GetInstance()->oauth2_chrome_client_id(),
     64       GaiaUrls::GetInstance()->oauth2_chrome_client_secret(),
     65       oauth2_refresh_token_,
     66       scopes);
     67 }
     68 
     69 void PolicyOAuth2TokenFetcher::OnClientOAuthSuccess(
     70     const GaiaAuthConsumer::ClientOAuthResult& oauth2_tokens) {
     71   LOG(INFO) << "OAuth2 tokens for policy fetching succeeded.";
     72   oauth2_tokens_ = oauth2_tokens;
     73   oauth2_refresh_token_ = oauth2_tokens.refresh_token;
     74   retry_count_ = 0;
     75   StartFetchingAccessToken();
     76 }
     77 
     78 void PolicyOAuth2TokenFetcher::OnClientOAuthFailure(
     79     const GoogleServiceAuthError& error) {
     80   LOG(ERROR) << "OAuth2 tokens fetch for policy fetch failed!";
     81   RetryOnError(error,
     82                base::Bind(&PolicyOAuth2TokenFetcher::StartFetchingRefreshToken,
     83                           AsWeakPtr()));
     84 }
     85 
     86 void PolicyOAuth2TokenFetcher::OnGetTokenSuccess(
     87     const std::string& access_token,
     88     const base::Time& expiration_time) {
     89   LOG(INFO) << "OAuth2 access token (device management) fetching succeeded.";
     90   oauth2_access_token_ = access_token;
     91   ForwardPolicyToken(access_token,
     92                      GoogleServiceAuthError(GoogleServiceAuthError::NONE));
     93 }
     94 
     95 void PolicyOAuth2TokenFetcher::OnGetTokenFailure(
     96     const GoogleServiceAuthError& error) {
     97   LOG(ERROR) << "OAuth2 access token (device management) fetching failed!";
     98   RetryOnError(error,
     99                base::Bind(&PolicyOAuth2TokenFetcher::StartFetchingAccessToken,
    100                           AsWeakPtr()));
    101 }
    102 
    103 void PolicyOAuth2TokenFetcher::RetryOnError(const GoogleServiceAuthError& error,
    104                                             const base::Closure& task) {
    105   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
    106   if ((error.state() == GoogleServiceAuthError::CONNECTION_FAILED ||
    107        error.state() == GoogleServiceAuthError::SERVICE_UNAVAILABLE ||
    108        error.state() == GoogleServiceAuthError::REQUEST_CANCELED) &&
    109       retry_count_ < kMaxRequestAttemptCount) {
    110     retry_count_++;
    111     BrowserThread::PostDelayedTask(
    112         BrowserThread::UI, FROM_HERE, task,
    113         base::TimeDelta::FromMilliseconds(kRequestRestartDelay));
    114     return;
    115   }
    116   LOG(ERROR) << "Unrecoverable error or retry count max reached.";
    117   failed_ = true;
    118   // Invoking the |callback_| signals to the owner of this object that it has
    119   // completed, and the owner may delete this object on the callback method.
    120   // So don't rely on |this| still being valid after ForwardPolicyToken()
    121   // returns i.e. don't write to |failed_| or other fields.
    122   ForwardPolicyToken(std::string(), error);
    123 }
    124 
    125 void PolicyOAuth2TokenFetcher::ForwardPolicyToken(
    126     const std::string& token,
    127     const GoogleServiceAuthError& error) {
    128   if (!callback_.is_null())
    129     callback_.Run(token, error);
    130 }
    131 
    132 }  // namespace policy
    133