# encoding: utf-8
# copyright: 2015, Vulcano Security GmbH
# author: Dominik Richter
# author: Christoph Hartmann
# license: All rights reserved

require 'utils/simpleconfig'
require 'utils/find_files'
require 'resources/postgres'

class PostgresConf < Inspec.resource(1)
  name 'postgres_conf'
  desc 'Use the postgres_conf InSpec audit resource to test the contents of the configuration file for PostgreSQL, typically located at /etc/postgresql/<version>/main/postgresql.conf or /var/lib/postgres/data/postgresql.conf, depending on the platform.'
  example "
    describe postgres_conf do
      its('max_connections') { should eq '5' }
    end
  "

  include FindFiles

  def initialize(conf_path = nil)
    @conf_path = conf_path || inspec.postgres.conf_path
    @conf_dir = File.expand_path(File.dirname @conf_path)
    @files_contents = {}
    @content = nil
    @params = nil
    read_content
  end

  def content
    @content ||= read_content
  end

  def params(*opts)
    @params || read_content
    res = @params
    opts.each do |opt|
      res = res[opt] unless res.nil?
    end
    res
  end

  def read_content
    @content = ''
    @params = {}

    # skip if the main configuration file doesn't exist
    if !inspec.file(@conf_path).file?
      return skip_resource "Can't find file \"#{@conf_path}\""
    end
    raw_conf = read_file(@conf_path)
    if raw_conf.empty? && inspec.file(@conf_path).size > 0
      return skip_resource("Can't read file \"#{@conf_path}\"")
    end

    to_read = [@conf_path]
    until to_read.empty?
      raw_conf = read_file(to_read[0])
      @content += raw_conf

      params = SimpleConfig.new(raw_conf).params
      @params.merge!(params)

      to_read = to_read.drop(1)
      # see if there is more config files to include

      to_read += include_files(params).find_all do |fp|
        not @files_contents.key? fp
      end
    end
    @content
  end

  def include_files(params)
    include_files = params['include'] || []
    include_files += params['include_if_exists'] || []
    dirs = params['include_dir'] || []
    dirs.each do |dir|
      dir = File.join(@conf_dir, dir) if dir[0] != '/'
      include_files += find_files(dir, depth: 1, type: 'file')
    end
    include_files
  end

  def read_file(path)
    @files_contents[path] ||= inspec.file(path).content
  end

  def to_s
    'PostgreSQL Configuration'
  end
end