// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_UI_CRYPTO_MODULE_DELEGATE_NSS_H_
#define CHROME_BROWSER_UI_CRYPTO_MODULE_DELEGATE_NSS_H_

#include <string>

#include "base/compiler_specific.h"
#include "base/synchronization/waitable_event.h"
#include "chrome/browser/ui/crypto_module_password_dialog.h"
#include "crypto/nss_crypto_module_delegate.h"

namespace content {
class ResourceContext;
}

// Delegate to handle unlocking a slot or indicating which slot to store a key
// in. When passing to NSS functions which take a wincx argument, use the value
// returned from the wincx() method.
class ChromeNSSCryptoModuleDelegate
    : public crypto::NSSCryptoModuleDelegate {
 public:
  // Create a ChromeNSSCryptoModuleDelegate. |reason| is used to select what
  // string to show the user, |server| is displayed to indicate which connection
  // is causing the dialog to appear.
  ChromeNSSCryptoModuleDelegate(chrome::CryptoModulePasswordReason reason,
                                const std::string& server);

  virtual ~ChromeNSSCryptoModuleDelegate();

  // Must be called on IO thread. Returns true if the delegate is ready for use.
  // Otherwise, if |initialization_complete_callback| is non-null, the
  // initialization will proceed asynchronously and the callback will be run
  // once the delegate is ready to use. In that case, the caller must ensure the
  // delegate remains alive until the callback is run.
  bool InitializeSlot(content::ResourceContext* context,
                      const base::Closure& initialization_complete_callback)
      WARN_UNUSED_RESULT;

  // crypto::NSSCryptoModuleDelegate implementation.
  virtual crypto::ScopedPK11Slot RequestSlot() OVERRIDE;

  // crypto::CryptoModuleBlockingPasswordDelegate implementation.
  virtual std::string RequestPassword(const std::string& slot_name,
                                      bool retry,
                                      bool* cancelled) OVERRIDE;

 private:
  void ShowDialog(const std::string& slot_name, bool retry);

  void GotPassword(const std::string& password);

  void DidGetSlot(const base::Closure& callback, crypto::ScopedPK11Slot slot);

  // Parameters displayed in the dialog.
  const chrome::CryptoModulePasswordReason reason_;
  const std::string server_;

  // Event to block worker thread while waiting for dialog on UI thread.
  base::WaitableEvent event_;

  // Stores the results from the dialog for access on worker thread.
  std::string password_;
  bool cancelled_;

  // The slot which will be returned by RequestSlot.
  crypto::ScopedPK11Slot slot_;

  DISALLOW_COPY_AND_ASSIGN(ChromeNSSCryptoModuleDelegate);
};

// Create a delegate which only handles unlocking slots.
crypto::CryptoModuleBlockingPasswordDelegate*
    CreateCryptoModuleBlockingPasswordDelegate(
        chrome::CryptoModulePasswordReason reason,
        const std::string& server);

#endif  // CHROME_BROWSER_UI_CRYPTO_MODULE_DELEGATE_NSS_H_