text: #!/usr/bin/env python2
  # -*- mode: python -*-
  #
  # Electrum - lightweight Bitcoin client
  # Copyright (C) 2016  The Electrum developers
  #
  # Permission is hereby granted, free of charge, to any person
  # obtaining a copy of this software and associated documentation files
  # (the "Software"), to deal in the Software without restriction,
  # including without limitation the rights to use, copy, modify, merge,
  # publish, distribute, sublicense, and/or sell copies of the Software,
  # and to permit persons to whom the Software is furnished to do so,
  # subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be
  # included in all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  # EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  # NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  # BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  # ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  # CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  # SOFTWARE.
  
  from electrum_nmc.plugins import BasePlugin, hook
  from electrum_nmc.i18n import _
  from electrum_nmc.bitcoin import is_address
  
  
  class HW_PluginBase(BasePlugin):
      # Derived classes provide:
      #
      #  class-static variables: client_class, firmware_URL, handler_class,
      #     libraries_available, libraries_URL, minimum_firmware,
      #     wallet_class, ckd_public, types, HidTransport
  
      def __init__(self, parent, config, name):
          BasePlugin.__init__(self, parent, config, name)
          self.device = self.keystore_class.device
          self.keystore_class.plugin = self
  
      def is_enabled(self):
          return True
  
      def device_manager(self):
          return self.parent.device_manager
  
      @hook
      def close_wallet(self, wallet):
          for keystore in wallet.get_keystores():
              if isinstance(keystore, self.keystore_class):
                  self.device_manager().unpair_xpub(keystore.xpub)
  
      def setup_device(self, device_info, wizard, purpose):
          """Called when creating a new wallet or when using the device to decrypt
          an existing wallet. Select the device to use.  If the device is
          uninitialized, go through the initialization process.
          """
          raise NotImplementedError()
  
      def show_address(self, wallet, address, keystore=None):
          pass  # implemented in child classes
  
      def show_address_helper(self, wallet, address, keystore=None):
          if keystore is None:
              keystore = wallet.get_keystore()
          if not is_address(address):
              keystore.handler.show_error(_('Invalid Bitcoin Address'))
              return False
          if not wallet.is_mine(address):
              keystore.handler.show_error(_('Address not in wallet.'))
              return False
          if type(keystore) != self.keystore_class:
              return False
          return True
  