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require 'optparse'
require 'ostruct'
module ROTP
class Arguments
def initialize(filename, arguments)
@filename = filename
@arguments = Array(arguments)
end
def options
parse
options!
end
def to_s
parser.help + "\n"
end
private
attr_reader :arguments, :filename
def options!
@options ||= default_options
end
def default_options
OpenStruct.new time: true, counter: 0, mode: :time
end
def parse
return options!.mode = :help if arguments.empty?
parser.parse arguments
rescue OptionParser::InvalidOption => exception
options!.mode = :help
options!.warnings = red(exception.message + '. Try --help for help.')
end
def parser
OptionParser.new do |parser|
parser.banner = ''
parser.separator green(' Usage: ') + bold("#{filename} [options]")
parser.separator ''
parser.separator green ' Examples: '
parser.separator ' ' + bold("#{filename} --secret p4ssword") + ' # Generates a time-based one-time password'
parser.separator ' ' + bold("#{filename} --hmac --secret p4ssword --counter 42") + ' # Generates a counter-based one-time password'
parser.separator ''
parser.separator green ' Options:'
parser.on('-s', '--secret [SECRET]', 'The shared secret') do |secret|
options!.secret = secret
end
parser.on('-c', '--counter [COUNTER]', 'The counter for counter-based hmac OTP') do |counter|
options!.counter = counter.to_i
end
parser.on('-t', '--time', 'Use time-based OTP according to RFC 6238 (default)') do
options!.mode = :time
end
parser.on('-m', '--hmac', 'Use counter-based OTP according to RFC 4226') do
options!.mode = :hmac
end
parser.on_tail('-h', '--help', 'Show this message') do
options!.mode = :help
end
parser.on('-d', '--digest [ALGORITHM]', 'Use algorithm for the digest (default sha1)') do |digest|
options!.digest = digest
end
end
end
def bold(string)
"\033[1m#{string}\033[22m"
end
def green(string)
"\033[32m#{string}\033[0m"
end
def red(string)
"\033[31m#{string}\033[0m"
end
end
end
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