src/chrome/browser/chromeos/login/tpm_password_fetcher.h

   1 // Copyright (c) 2012 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 CHROME_BROWSER_CHROMEOS_LOGIN_TPM_PASSWORD_FETCHER_H_
   6 #define CHROME_BROWSER_CHROMEOS_LOGIN_TPM_PASSWORD_FETCHER_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "chromeos/dbus/dbus_method_call_status.h"
  13
  14 namespace chromeos {
  15
  16 // Interface which TpmPasswordFetcher uses to notify that password has been
  17 // fetched.
  18 class TpmPasswordFetcherDelegate {
  19  public:
  20   virtual ~TpmPasswordFetcherDelegate() {}
  21   virtual void OnPasswordFetched(const std::string& tpm_password) = 0;
  22 };
  23
  24 // Class for fetching TPM password from the Cryptohome.
  25 class TpmPasswordFetcher {
  26  public:
  27   // Creates fetcher with the given delegate to be notified every time fetching
  28   // is done.
  29   explicit TpmPasswordFetcher(TpmPasswordFetcherDelegate* delegate);
  30   ~TpmPasswordFetcher();
  31
  32   // Fetches TPM password and stores the result. Also notifies |delegate_| with
  33   // OnPasswordFetched() call.
  34   void Fetch();
  35
  36  private:
  37   // Used to implement Fetch().
  38   void OnTpmIsReady(DBusMethodCallStatus call_status, bool tpm_is_ready);
  39
  40   // Used to implement Fetch().
  41   void OnTpmGetPassword(DBusMethodCallStatus call_status,
  42                         const std::string& password);
  43
  44   // Posts a task to call Fetch() later.
  45   void RescheduleFetch();
  46
  47   base::WeakPtrFactory<TpmPasswordFetcher> weak_factory_;
  48   TpmPasswordFetcherDelegate* delegate_;
  49
  50   DISALLOW_COPY_AND_ASSIGN(TpmPasswordFetcher);
  51 };
  52
  53 }  // namespace chromeos
  54
  55 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_TPM_PASSWORD_FETCHER_H_