require 'fileutils'

module Msf

###
#
# This class wraps interaction with global configuration that can be used as a
# persistent storage point for configuration, logs, and other such fun things.
#
###
class Config < Hash

	#
	# The installation root directory for the distribution
	#
	InstallRoot = File.expand_path(File.join(File.dirname(__FILE__), '..', '..', '..'))

	#
	# Determines the base configuration directory.
	#
	def self.get_config_root
	
		# Windows-specific environment variables
		['LOCALAPPDATA', 'APPDATA', 'USERPROFILE'].each do |dir|
			if (ENV[dir] and File.directory?(ENV[dir]))
				return File.join(ENV[dir], ".msf3")
			end
		end
								
		begin
			# First we try $HOME/.msf3
			File.expand_path("~#{FileSep}.msf3")
		rescue ::ArgumentError
			# Give up and install root + ".msf3"
			InstallRoot + ".msf3"
		end
	end

	#
	# Default values
	#
	FileSep     = File::SEPARATOR
	Defaults    =
		{
			'ConfigDirectory'     => get_config_root,
			'ConfigFile'          => "config",
			'ModuleDirectory'     => "modules",
			'ScriptDirectory'     => "scripts",
			'LogDirectory'        => "logs",
			'SessionLogDirectory' => "logs/sessions",
			'PluginDirectory'     => "plugins",
			'DataDirectory'       => "data"
		}

	##
	#
	# Class methods
	#
	##

	#
	# Returns the framework installation root.
	#
	def self.install_root
		InstallRoot
	end

	#
	# Calls the instance method.
	#
	def self.config_directory
		self.new.config_directory
	end

	#
	# Calls the instance method.
	#
	def self.module_directory
		self.new.module_directory
	end

	#
	# Calls the instance method.
	#
	def self.script_directory
		self.new.script_directory
	end

	#
	# Calls the instance method.
	#
	def self.log_directory
		self.new.log_directory
	end

	#
	# Calls the instance method.
	#
	def self.plugin_directory
		self.new.plugin_directory
	end

	#
	# Calls the instance method.
	#
	def self.session_log_directory
		self.new.session_log_directory
	end
	
	#
	# Calls the instance method.
	#
	def self.user_module_directory
		self.new.user_module_directory
	end

	#
	# Calls the instance method.
	#
	def self.user_script_directory
		self.new.user_script_directory
	end
	
	#
	# Calls the instance method.
	#
	def self.data_directory
		self.new.data_directory
	end

	#
	# Calls the instance method.
	#
	def self.config_file
		self.new.config_file
	end

	#
	# Calls the instance method.
	#
	def self.init
		self.new.init
	end

	#
	# Calls the instance method.
	#
	def self.load(path = nil)
		self.new.load(path)
	end

	#
	# Calls the instance method.
	#
	def self.save(opts)
		self.new.save(opts)
	end

	#
	# Updates the config class' self with the default hash.
	#
	def initialize
		update(Defaults)
	end

	#
	# Returns the installation root directory
	#
	def install_root
		InstallRoot
	end

	#
	# Returns the configuration directory default.
	#
	def config_directory
		self['ConfigDirectory']
	end

	#
	# Returns the full path to the configuration file.
	#
	def config_file
		config_directory + FileSep + self['ConfigFile']
	end

	#
	# Returns the global module directory.
	#
	def module_directory
		install_root + FileSep + self['ModuleDirectory']
	end

	#
	# Returns the path that scripts can be loaded from.
	#
	def script_directory
		install_root + FileSep + self['ScriptDirectory']
	end

	#
	# Returns the directory that log files should be stored in.
	#
	def log_directory
		config_directory + FileSep + self['LogDirectory']
	end

	#
	# Returns the directory that plugins are stored in.
	#
	def plugin_directory
		install_root + FileSep + self['PluginDirectory']
	end

	#
	# Returns the directory in which session log files are to reside.
	#
	def session_log_directory
		config_directory + FileSep + self['SessionLogDirectory']
	end

	#
	# Returns the user-specific module base path
	#
	def user_module_directory
		config_directory + FileSep + "modules"
	end

	#
	# Returns the user-specific script base path
	#
	def user_script_directory
		config_directory + FileSep + "scripts"
	end

	#
	# Returns the data directory
	#
	def data_directory
		install_root + FileSep + self['DataDirectory']
	end

	#
	# Initializes configuration, creating directories as necessary.
	#
	def init
		FileUtils.mkdir_p(config_directory)
		FileUtils.mkdir_p(log_directory)
		FileUtils.mkdir_p(session_log_directory)
		FileUtils.mkdir_p(user_module_directory)
	end

	#
	# Loads configuration from the supplied file path, or the default one if
	# none is specified.
	#
	def load(path = nil)
		path = config_file if (!path)

		return Rex::Parser::Ini.new(path)
	end

	#
	# Saves configuration to the path specified in the ConfigFile hash key or
	# the default path is one isn't specified.  The options should be group
	# references that have named value pairs.  Example:
	#
	# save(
	#   'ExampleGroup' =>
	#      {
	#         'Foo' => 'Cat'
	#      })
	#
	def save(opts)
		ini = Rex::Parser::Ini.new(opts['ConfigFile'] || config_file)

		ini.update(opts)

		ini.to_file
	end

end

end