diagnostic.rb

module Diagnostic
  class KeyInject
    FILE = './shared/injected_keys.json'

    def self.table_exist?
      File.exists?(FILE)
    end

    def self.table
      self.setup unless @table
      @table
    end

    def self.local
      self.setup unless @local
      @local
    end

    def self.metadata
      if self.local
        #
      else
        []
      end
    end

    def self.setup
      @local = self.system_check
      if self.table_exists?
        @table = JSON.parse(File.read(FILE))
      else
        @table = []
      end
    end

    def self.system_check
      (0..100).to_a.inject({}) do |hash, slot|
        ksn = Device::Pinpad.key_ksn(slot)
        if (ksn[:pin][0] == 0 || ksn[:data][0] == 0)
          hash[slot] = (ksn[:pin][1] || ksn[:data][1])
        end
        hash
      end
    end
  end
end

#... Handshake class
def injected_keys
  Diagnostic::KeyInject.local.inject([]) do |array, key|
    acquirer = Diagnostic::KeyInject.table.find {|row| row["ksi"] == key[1][0..9]}

    array << {key[0] => "#{acquirer["acquirer_name"]} #{acquirer["type"]}"}
  end.to_json
end
#...