OAuth2 support for Webstore downloads.

extensions/browser/webstore_oauth2_token_provider.h

+// 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.
+
+#ifndef EXTENSIONS_BROWSER_WEBSTORE_OAUTH2_TOKEN_PROVIDER_H_
+#define EXTENSIONS_BROWSER_WEBSTORE_OAUTH2_TOKEN_PROVIDER_H_
+
+#include <queue>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "google_apis/gaia/oauth2_token_service.h"
+
+class IdentityProvider;
+
+namespace extensions {
+
+// Provides access tokens for resources
+class WebstoreOAuth2TokenProvider : public OAuth2TokenService::Consumer {
+ public:
+  typedef base::Callback<void(bool success, const std::string& token)>
+      FetchCallback;
+
+  explicit WebstoreOAuth2TokenProvider(IdentityProvider* identity_provider);
+  virtual ~WebstoreOAuth2TokenProvider();
+
+  void FetchToken(const FetchCallback& callback);
+
+ private:
+  // OAuth2TokenService::Consumer implementation.
+  virtual void OnGetTokenSuccess(const OAuth2TokenService::Request* request,
+                                 const std::string& access_token,
+                                 const base::Time& expiration_time) OVERRIDE;
+  virtual void OnGetTokenFailure(const OAuth2TokenService::Request* request,
+                                 const GoogleServiceAuthError& error) OVERRIDE;
+
+  // Exposes an OAuth2TokenService and information about the active account ID.
+  // Not owned and must outlive this WebstoreOAuth2TokenProvider.
+  IdentityProvider* identity_provider_;
+
+  // A cached access token from the last successful token fetch.
+  std::string access_token_;
+
+  // Callbacks pending the receipt of a new token.
+  typedef std::queue<FetchCallback> CallbackQueue;
+  CallbackQueue pending_callbacks_;
+
+  scoped_ptr<OAuth2TokenService::Request> access_token_request_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebstoreOAuth2TokenProvider);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_BROWSER_WEBSTORE_OAUTH2_TOKEN_PROVIDER_H_