#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# Copyright 2013 The Plaso Project Authors.
# Please see the AUTHORS file for details on individual authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""This file contains the Terminal Server Registry plugins."""

from plaso.events import windows_events
from plaso.parsers import winreg
from plaso.parsers.winreg_plugins import interface


__author__ = 'David Nides (david.nides@gmail.com)'


class TerminalServerClientPlugin(interface.KeyPlugin):
  """Windows Registry plugin for Terminal Server Client Connection keys."""

  NAME = 'winreg_rdp'
  DESCRIPTION = u'Parser for Terminal Server Client Connection Registry data.'

  REG_TYPE = 'NTUSER'
  REG_KEYS = [
      u'\\Software\\Microsoft\\Terminal Server Client\\Servers',
      u'\\Software\\Microsoft\\Terminal Server Client\\Default\\AddIns\\RDPDR']

  def GetEntries(
      self, parser_context, key=None, registry_type=None, file_entry=None,
      parser_chain=None, **unused_kwargs):
    """Collect Values in Servers and return event for each one.

    Args:
      parser_context: A parser context object (instance of ParserContext).
      key: Optional Registry key (instance of winreg.WinRegKey).
           The default is None.
      registry_type: Optional Registry type string. The default is None.
      file_entry: Optional file entry object (instance of dfvfs.FileEntry).
                  The default is None.
      parser_chain: Optional string containing the parsing chain up to this
                    point. The default is None.
    """
    for subkey in key.GetSubkeys():
      username_value = subkey.GetValue('UsernameHint')

      if (username_value and username_value.data and
          username_value.DataIsString()):
        username = username_value.data
      else:
        username = u'None'

      text_dict = {}
      text_dict['UsernameHint'] = username

      event_object = windows_events.WindowsRegistryEvent(
          key.last_written_timestamp, key.path, text_dict, offset=key.offset,
          registry_type=registry_type,
          source_append=': RDP Connection')
      parser_context.ProduceEvent(
          event_object, parser_chain=parser_chain, file_entry=file_entry)


class TerminalServerClientMRUPlugin(interface.KeyPlugin):
  """Windows Registry plugin for Terminal Server Client Connection MRUs keys."""

  NAME = 'winreg_rdp_mru'
  DESCRIPTION = u'Parser for Terminal Server Client MRU Registry data.'

  REG_TYPE = 'NTUSER'
  REG_KEYS = [
      u'\\Software\\Microsoft\\Terminal Server Client\\Default',
      u'\\Software\\Microsoft\\Terminal Server Client\\LocalDevices']

  def GetEntries(
      self, parser_context, key=None, registry_type=None, file_entry=None,
      parser_chain=None, **unused_kwargs):
    """Collect MRU Values and return event for each one.

    Args:
      parser_context: A parser context object (instance of ParserContext).
      key: Optional Registry key (instance of winreg.WinRegKey).
           The default is None.
      registry_type: Optional Registry type string. The default is None.
      parser_chain: Optional string containing the parsing chain up to this
              point. The default is None.
      file_entry: Optional file entry object (instance of dfvfs.FileEntry).
                  The default is None.
    """
    for value in key.GetValues():
      # TODO: add a check for the value naming scheme.
      # Ignore the default value.
      if not value.name:
        continue

      # Ignore any value that is empty or that does not contain a string.
      if not value.data or not value.DataIsString():
        continue

      text_dict = {}
      text_dict[value.name] = value.data

      if value.name == 'MRU0':
        timestamp = key.last_written_timestamp
      else:
        timestamp = 0

      event_object = windows_events.WindowsRegistryEvent(
          timestamp, key.path, text_dict, offset=key.offset,
          registry_type=registry_type,
          source_append=u': RDP Connection')
      parser_context.ProduceEvent(
          event_object, parser_chain=parser_chain, file_entry=file_entry)


winreg.WinRegistryParser.RegisterPlugins([
    TerminalServerClientPlugin, TerminalServerClientMRUPlugin])