chromeos/tpm/tpm_password_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 CHROMEOS_TPM_TPM_PASSWORD_FETCHER_H_
   6 #define CHROMEOS_TPM_TPM_PASSWORD_FETCHER_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "chromeos/chromeos_export.h"
  13 #include "chromeos/dbus/dbus_method_call_status.h"
  14
  15 namespace chromeos {
  16
  17 // Interface which TpmPasswordFetcher uses to notify that password has been
  18 // fetched.
  19 class CHROMEOS_EXPORT TpmPasswordFetcherDelegate {
  20  public:
  21   virtual ~TpmPasswordFetcherDelegate() {}
  22   virtual void OnPasswordFetched(const std::string& tpm_password) = 0;
  23 };
  24
  25 // Class for fetching TPM password from the Cryptohome.
  26 class CHROMEOS_EXPORT TpmPasswordFetcher {
  27  public:
  28   // Creates fetcher with the given delegate to be notified every time fetching
  29   // is done.
  30   explicit TpmPasswordFetcher(TpmPasswordFetcherDelegate* delegate);
  31   ~TpmPasswordFetcher();
  32
  33   // Fetches TPM password and stores the result. Also notifies |delegate_| with
  34   // OnPasswordFetched() call.
  35   void Fetch();
  36
  37  private:
  38   // Used to implement Fetch().
  39   void OnTpmIsReady(DBusMethodCallStatus call_status, bool tpm_is_ready);
  40
  41   // Used to implement Fetch().
  42   void OnTpmGetPassword(DBusMethodCallStatus call_status,
  43                         const std::string& password);
  44
  45   // Posts a task to call Fetch() later.
  46   void RescheduleFetch();
  47
  48   TpmPasswordFetcherDelegate* delegate_;
  49
  50   base::WeakPtrFactory<TpmPasswordFetcher> weak_factory_;
  51
  52   DISALLOW_COPY_AND_ASSIGN(TpmPasswordFetcher);
  53 };
  54
  55 }  // namespace chromeos
  56
  57 #endif  // CHROMEOS_TPM_TPM_PASSWORD_FETCHER_H_