module Asn1Parser

# File lib/asn1_parser.rb, line 48
def self.cdr(list)
  list[1..list.length]
end

# File lib/asn1_parser.rb, line 30
def self.makehash(array)
  hash = {}

  (0..(array.length - 1)).step(2) do |i|
    cd = CharDet.detect(array[i])
    cd['encoding'] = cd['encoding'] || 'utf-8'
    hash[array[i + 1]] = array[i]&.force_encoding(cd['encoding'])
  end

  hash
end

# File lib/asn1_parser.rb, line 9
def self.parse(filepath)
  crt_encoded = File.open(filepath).read
  obj = OpenSSL::ASN1.decode(crt_encoded)
  gacc = []

  collect = lambda { |obj, acc|
    if obj.nil?
      gacc
    elsif obj.respond_to?('[]')
      collect.call(obj[0], collect.call(cdr(obj), acc))
    elsif obj.value.is_a? String
      gacc.push(obj.value)
    elsif obj.value.respond_to?('[]')
      collect.call(obj.value[0], collect.call(cdr(obj.value), acc))
    end
  }

  collect.call(obj, [])
  gacc
end

# File lib/asn1_parser.rb, line 42
def self.printhash(hash)
  hash.each do |key, value|
    puts "#{key} => #{value}"
  end
end