components/proximity_auth/cryptauth/cryptauth_access_token_fetcher.h

   1 // Copyright 2014 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 #ifndef COMPONENTS_PROXIMITY_AUTH_CRYPT_AUTH_ACCESS_TOKEN_FETCHER_H
   6 #define COMPONENTS_PROXIMITY_AUTH_CRYPT_AUTH_ACCESS_TOKEN_FETCHER_H
   7
   8 #include <string>
   9
  10 #include "base/callback_forward.h"
  11
  12 namespace proximity_auth {
  13
  14 // Simple interface for fetching the OAuth2 access token that authorizes
  15 // CryptAuth API calls. Do not reuse this after calling FetchAccessToken();
  16 // instead, create a new instance.
  17 class CryptAuthAccessTokenFetcher {
  18  public:
  19   virtual ~CryptAuthAccessTokenFetcher() {}
  20
  21   // Fetches the access token asynchronously, invoking the callback upon
  22   // completion. If the fetch fails, the callback will be invoked with an empty
  23   // string.
  24   typedef base::Callback<void(const std::string&)> AccessTokenCallback;
  25   virtual void FetchAccessToken(const AccessTokenCallback& callback) = 0;
  26 };
  27
  28 }  // namespace proximity_auth
  29
  30 #endif  // COMPONENTS_PROXIMITY_AUTH_CRYPT_AUTH_ACCESS_TOKEN_FETCHER_H