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Contents
module Ramaze
module Helper
# Produce very simple question/answer pairs.
#
# The default is a trivial mathematical problem.
#
# Usage (trait is optional):
#
# class RegisterController < Ramaze::Controller
# trait :captcha => lambda{
# ["the answer to everything", "42"]
# }
#
# def index
# %(
# <form action="#{r(:answer}">
# What is #{simple_captcha}?
# <input type="text" name="answer" />"
# <input type="submit" />
# </form>
# ).strip
# end
#
# def answer
# check_captcha(request[:answer])
# end
# end
module SimpleCaptcha
include Ramaze::Traited
NUMBERS = [5, 10, 15, 20]
# lambda should return question and answer in [question, answer] form
trait :captcha => lambda{
ns = Array.new(2){ NUMBERS.sort_by{rand}.first }.sort
op = rand > 0.42 ? [ns[0], :+, ns[1]] : [ns[1], :-, ns[0]]
question = op.join(' ')
answer = op[0].send(op[1], op[2])
[question, answer]
}
# Call the trait[:captcha] and store question/answer in session
def simple_captcha
question, answer = ancestral_trait[:captcha].call
session[:CAPTCHA] = { :question => question, :answer => answer.to_s }
question
end
# check the given +answer+ against the answer stored in the session.
def check_captcha(answer)
return false unless captcha = session[:CAPTCHA]
answer.to_s.strip == captcha[:answer].to_s
end
end
end
end
Version data entries
29 entries across 29 versions & 4 rubygems