Class: Magnet::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/magnet/parser.rb

Defined Under Namespace

Classes: InvalidDataError

Constant Summary collapse

TRACKS = 
{
  1 => /\A%(?<format>[A-Z])(?<pan>[0-9 ]{1,19})\^(?<name>[^^]*)\^\s?(?<expiration>\d{4}|\^)(?<service_code>\d{3}|\^)(?<discretionary_data>[^\?]*)\?\Z/,
  2 => /\A;(?<pan>[0-9 ]{1,19})=(?<expiration>\d{4}|=)(?<service_code>\d{3}|=)(?<discretionary_data>[^\?]*)\?.?\Z/,
  'EMV' => /\A(?<pan>[0-9 ]{1,19})(d|D)(?<expiration>\d{4}|=)(?<service_code>\d{3}|=)(?<discretionary_data>[^\?fF]*)(f|F)?\Z/,
}.freeze

Instance Method Summary collapse

Constructor Details

#initialize(track = :auto) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/magnet/parser.rb', line 9

def initialize(track = :auto)
  @track = :auto
end

Instance Method Details

#parse(track_data) ⇒ Object

Raises:



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# File 'lib/magnet/parser.rb', line 13

def parse(track_data)
  tracks = @track == :auto ? TRACKS.values : [TRACKS[@track]]

  tracks.each do |track|
    if m = track.match(track_data)
      attributes = {}
      if track == TRACKS[1]
        attributes[:format] = m[:format]
        attributes[:pan] = m[:pan]
        attributes[:name] = m[:name]
        attributes[:expiration] = m[:expiration] == "^" ? nil : m[:expiration]
        attributes[:service_code] = m[:service_code] == "^" ? nil : m[:service_code]
        attributes[:discretionary_data] = m[:discretionary_data] == "" ? nil : m[:discretionary_data]
        return attributes
      elsif track == TRACKS[2] || track == TRACKS['EMV']
        attributes[:pan] = m[:pan]
        attributes[:expiration] = m[:expiration] == "=" ? nil : m[:expiration]
        attributes[:service_code] = m[:service_code] == "=" ? nil : m[:service_code]
        attributes[:discretionary_data] = m[:discretionary_data] == "" ? nil : m[:discretionary_data]
        return attributes
      end
    end
  end

  raise InvalidDataError, "track data is not valid"
end