OAuth2 sign-in flow for ChromeOS

chrome/browser/chromeos/login/oauth2_policy_fetcher.h

+// 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_LOGIN_OAUTH2_POLICY_FETCHER_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_OAUTH2_POLICY_FETCHER_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/callback.h"

[Joao da Silva, 2013/01/11 16:45:07]

callback_forward.h can be used here

[zel, 2013/01/11 19:51:16]

Done.

+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "google_apis/gaia/gaia_auth_consumer.h"
+#include "google_apis/gaia/oauth2_access_token_consumer.h"
+
+class GaiaAuthFetcher;
+class OAuth2AccessTokenFetcher;
+
+namespace net {
+class URLRequestContextGetter;
+}
+
+namespace chromeos {
+
+// Fetches the OAuth2 token for the device management service. Since Profile
+// creation might be blocking on a user policy fetch, this fetcher must always
+// send a (possibly empty) token to the BrowserPolicyConnector, which will then
+// let the policy subsystem proceed and resume Profile creation.
+// Sending the token even when no Profile is pending is also OK.
+class OAuth2PolicyFetcher : public base::SupportsWeakPtr<OAuth2PolicyFetcher>,
+                            public GaiaAuthConsumer,
+                            public OAuth2AccessTokenConsumer {
+ public:
+  // Fetches the device management service's OAuth2 token using
+  // |oauth2_tokens.refresh_token|.
+  OAuth2PolicyFetcher(net::URLRequestContextGetter* system_context_getter,
+                      const std::string& oauth2_refresh_token);
+  // Fetches the device management service's oauth2 token, after also retrieving
+  // the OAuth2 refresh tokens.
+  explicit OAuth2PolicyFetcher(

[Joao da Silva, 2013/01/11 16:45:07]

Doesn't have to be explicit.

[zel, 2013/01/11 19:51:16]

Done.

+      net::URLRequestContextGetter* auth_context_getter,
+      net::URLRequestContextGetter* system_context_getter);
+
+  virtual ~OAuth2PolicyFetcher();
+
+  // Starts process of minting device management service OAuth2 access token.
+  void Start();
+
+  // Returns OAuth2 tokens fetched through an authenticated cookie jar.
+  const GaiaAuthConsumer::ClientOAuthResult& oauth2_tokens() const {
+    return oauth2_tokens_;
+  }
+
+  // True if we have OAuth2 tokens that were fetched through an authenticated
+  // cookie jar.
+  bool has_oauth2_tokens() const {
+    return !oauth2_tokens_.refresh_token.empty();
+  }
+
+  // Returns true if we have previously attempted to fetch tokens with this
+  // class and failed.
+  bool failed() const {
+    return failed_;
+  }
+
+ private:
+  // GaiaAuthConsumer overrides.
+  virtual void OnClientOAuthSuccess(
+      const GaiaAuthConsumer::ClientOAuthResult& oauth_tokens) OVERRIDE;
+  virtual void OnClientOAuthFailure(
+      const GoogleServiceAuthError& error) OVERRIDE;
+
+  // OAuth2AccessTokenConsumer overrides.
+  virtual void OnGetTokenSuccess(const std::string& access_token,
+                                 const base::Time& expiration_time) OVERRIDE;
+  virtual void OnGetTokenFailure(const GoogleServiceAuthError& error) OVERRIDE;
+
+  // Starts fetching OAuth2 refresh token.
+  void StartFetchingRefreshToken();
+  // Starts fetching OAuth2 access token for the device management service.
+  void StartFetchingAccessToken();
+
+  void SetPolicyToken(const std::string& token);
+  // Decides how to proceed on GAIA |error|. If the error looks temporary,
+  // retries |task| until max retry count is reached.
+  // If retry count runs out, or error condition is unrecoverable, it calls
+  // Delegate::OnOAuth2TokenFetchFailed().
+  void RetryOnError(const GoogleServiceAuthError& error,
+                    const base::Closure& task);
+
+  scoped_ptr<GaiaAuthFetcher> refresh_token_fetcher_;
+  scoped_ptr<OAuth2AccessTokenFetcher> access_token_fetcher_;
+  std::string policy_token_;
+  GaiaAuthConsumer::ClientOAuthResult oauth2_tokens_;
+  // OAuth2 refresh token. Could come either from the outside or through
+  // refresh token fetching flow within this class.
+  std::string oauth2_refresh_token_;
+  // The retry counter. Increment this only when failure happened.
+  int retry_count_;
+  // True if we have already failed to fetch the policy.
+  bool failed_;
+
+  DISALLOW_COPY_AND_ASSIGN(OAuth2PolicyFetcher);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_OAUTH2_POLICY_FETCHER_H_