Home | History | Annotate | Download | only in login 
      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_
     56