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      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_PASSWORD_FETCHER_H_
      6 #define CHROMEOS_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_PASSWORD_FETCHER_H_
     58