Class: Winever::TaskManager

Inherits:
Object
  • Object
show all
Defined in:
lib/winever/task_manager.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ TaskManager

Returns a new instance of TaskManager.



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# File 'lib/winever/task_manager.rb', line 26

def initialize options={}
  if !has_task_scheduler?
    raise "Cannot use win32/taskscheduler on this system. Are you on windows?"
  end

  @options = options
end

Class Method Details

.clear_tasks(options = {}) ⇒ Object 



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# File 'lib/winever/task_manager.rb', line 18

def self.clear_tasks options={}
  new(options).clear_tasks_except
end

.has_task_scheduler? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/winever/task_manager.rb', line 3

def self.has_task_scheduler?
  return @has_task_scheduler unless @has_task_scheduler.nil?
  begin
    require 'win32/taskscheduler'
    @has_task_scheduler = true
  rescue LoadError => e
    @has_task_scheduler = false
  end
  @has_task_scheduler
end

.update_tasks(options = {}) ⇒ Object 



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# File 'lib/winever/task_manager.rb', line 22

def self.update_tasks options={}
  new(options).update_tasks
end

Instance Method Details

#clear_tasks_except(keep_tasks = []) ⇒ Object 



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# File 'lib/winever/task_manager.rb', line 85

def clear_tasks_except keep_tasks=[]
  ts = Win32::TaskScheduler.new
  task_names = ts.tasks.select{|tn| tn.end_with?('.' + identifier)}
  task_names.concat(Winever::WheneverInterface::existing_tasks_to_remove)

  task_names = task_names.reject{|tn| keep_tasks.include?(tn)}

  task_names.each{|tn| ts.delete(tn) if ts.exists?(tn)}
end

#create_task(cron_entry) ⇒ Object 



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# File 'lib/winever/task_manager.rb', line 95

def create_task cron_entry
  return if self.password.nil?

  task_name = generate_task_name(cron_entry.task_name)

  # Replacing the /dev/null by NUL
  parameters = cron_entry.parameters.gsub(/([\s'"])\/dev\/null([\s'"])/, '\1NUL\2')

  pw = password
  trigger = cron_entry.triggers.first
  work_directory = cron_entry.working_directory

  ts = Win32::TaskScheduler.new(nil, nil, cron_entry.task_folder, true)
  begin
    ts.password = pw
    ts.new_work_item(task_name, trigger)
    ts.application_name = 'cmd'
    ts.parameters = '/C ' + parameters
    ts.working_directory = work_directory
    ts.activate(task_name)
  rescue
    raise 'Failed at setting the task up. It might have been partially created/updated. This most likely means a bad password was entered.'
  end

  task_name
end

#create_tasks ⇒ Object 



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# File 'lib/winever/task_manager.rb', line 64

def create_tasks
  return if self.password.nil?

  cron_entries = Winever::WheneverInterface.valid_cron_entries(@options)

  created_task_names = []
  cron_entries.each do |cron_entry|
    created_task_names << create_task(cron_entry)
  end
  created_task_names
end

#generate_task_name(task_name) ⇒ Object 



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# File 'lib/winever/task_manager.rb', line 122

def generate_task_name task_name
  "#{task_name}.#{identifier}"
end

#has_task_scheduler? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/winever/task_manager.rb', line 14

def has_task_scheduler?
  self.class.has_task_scheduler?
end

#identifier ⇒ Object 



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# File 'lib/winever/task_manager.rb', line 126

def identifier
  # Removing the characters blocked by the windows file system. The single quote is just for simplicity.
  iden = @options[:identifier].gsub(/[:\/\\<>:"|?*']/, '_')
  raise 'Identifier must contain at least one letter or number.' unless iden =~ /\w/
  iden
end

#password ⇒ Object 



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# File 'lib/winever/task_manager.rb', line 34

def password
  return @options[:password] if @options.has_key?(:password)
  return ENV['WINEVER_PASSWORD'] if ENV['WINEVER_PASSWORD'] && !ENV['WINEVER_PASSWORD'].empty?

  return @password.empty? ? nil : @password if @password
  require 'highline/import'
  prompt = "    To setup tasks, the password of the current user account is needed.\n    Enter the password of the current windows user (or leave blank to avoid doing the changes):\n  PRMP\n\n  pw = ask(prompt){|q| q.echo = false}\n  while pw && !pw.empty? && !validate_password(pw)\n    prompt = <<-PRMP.gsub(/^ +/, '')\n      Invalid password entered.\n      Enter the password of the current windows user (or leave blank to avoid doing the changes):\n    PRMP\n    pw = ask(prompt){|q| q.echo = false}\n  end\n\n\n  #TODO get the password somehow.\n  # require File.expand_path('../../extensions/password', __FILE__)\n  # password = Password.ask(\"Enter password for current user account of the machine to setup tasks: \")\n  # validate_password(password)\n\n  @password = pw\n  pw.empty? ? nil : pw\nend\n".gsub(/^ +/, '')

#update_tasks ⇒ Object 



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# File 'lib/winever/task_manager.rb', line 76

def update_tasks
  return false if self.password.nil?

  task_names = create_tasks
  clear_tasks_except(task_names)

  true
end

#validate_password(password) ⇒ Object 



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# File 'lib/winever/task_manager.rb', line 133

def validate_password password
  # Validate a password by trying to create a task with it. If it fails, then the password is wrong.
  # Will delete the created task after.
  ts = Win32::TaskScheduler.new
  base_test_task_name = test_task_name = "Winever_test_task"
  i = 0
  while ts.exists?(test_task_name)
    i += 1
    test_task_name = "#{base_test_task_name}_#{i}"
  end

  trigger = { :start_year   => 2000,
              :start_month  => 6,
              :start_day    => 12,
              :start_hour   => 13,
              :start_minute => 17,
              :trigger_type => Win32::TaskScheduler::TASK_TIME_TRIGGER_ONCE}

  ts.new_work_item(test_task_name, trigger)
  valid = false
  begin
    ts.password = password
    ts.application_name = "cmd"
    valid = true
  rescue
    ts.password = nil
    valid = false
  end
  ts.delete(test_task_name)

  return valid
end