Class: Fluent::PAN::Masker

Inherits:
Object
  • Object
show all
Defined in:
lib/fluent/plugin/pan/masker.rb

Constant Summary collapse

CHECKSUM_FUNC = 
{
  luhn: ->(digits){
    sum = 0
    alt = false
    digits.reverse.each do |i|
      if alt
        i *= 2
        if i > 9
          i -= 9
        end
      end
      sum += i
      alt = !alt
    end
    (sum % 10).zero?
  },
  none: ->digits{
    # Do nothing. always satisfied.
    true
  }
}

Instance Method Summary collapse

Constructor Details

#initialize(regexp, checksum_algorithm, mask, force = false) ⇒ Masker

Returns a new instance of Masker.



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# File 'lib/fluent/plugin/pan/masker.rb', line 26

def initialize(regexp, checksum_algorithm, mask, force=false)
  @regexp = regexp
  @mask = mask
  @force = force
  @checksum_func = CHECKSUM_FUNC[checksum_algorithm]
end

Instance Method Details

#mask_if_found_pan(orgval) ⇒ Object 



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# File 'lib/fluent/plugin/pan/masker.rb', line 33

def mask_if_found_pan(orgval)
  filtered = orgval.to_s.gsub(@regexp) do |match|
    pan = match.split("").select { |i| i =~ /\d/ }.map { |j| j.to_i }

    if valid?(pan)
      match = @mask
    else
      match
    end
  end

  retval = filtered
  if orgval.is_a? Integer
    if numerals_mask?
      retval = filtered.to_i
    else
      if @force
        retval = filtered
      else
        retval = orgval
      end
    end
  end
  retval
end

#numerals_mask? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fluent/plugin/pan/masker.rb', line 63

def numerals_mask?
  if @mask.to_s =~ /^\d+$/
    true
  else
    false
  end
end

#valid?(pan) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fluent/plugin/pan/masker.rb', line 59

def valid?(pan)
  @checksum_func.call(pan)
end