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# NAME: recaptcha | |
# VERSION: 1.0 | |
# AUTHOR: Peter Cooper [ http://www.rubyinside.com/ github:peterc twitter:peterc ] | |
# DESCRIPTION: Sinatra plugin to provide CAPTCHA support through recaptcha.net | |
# COMPATIBILITY: 0.3.2 /and/ latest rtomayko Hoboken builds! | |
# LICENSE: Use for what you want, just don't claim full credit unless you make significant changes | |
# | |
# INSTRUCTIONS: | |
# 0. Check out an extended client code example at the footer of this file | |
# 1. Ensure _this_ file is lib/recaptcha.rb within your app's directory structure | |
# 2. Set RECAPTCHA_PRIVATE and RECAPTCHA_PUBLIC with your Recaptcha.net-provided keys | |
# 3. Require from app with require 'lib/recaptcha' | |
# 4. Use show_captcha from a view to get a CAPTCHA for a form | |
# 5. In response method, use: | |
# captcha_valid?(params[:recaptcha_challenge_field], params[:recaptcha_response_field]) | |
# to determine validity of response. | |
# 6. Act appropriately based on the results of step 5! | |
require 'net/http' | |
module Sinatra | |
module Plugins | |
module Recaptcha | |
RECAPTCHA_PRIVATE = "-- fill me in --" | |
RECAPTCHA_PUBLIC = "-- fill me in --" | |
RECAPTCHA_URL = "http://api-verify.recaptcha.net/verify" | |
def captcha_valid?(challenge, response, private_key = Sinatra::Plugins::Recaptcha::RECAPTCHA_PRIVATE) | |
begin | |
res = Net::HTTP.post_form(URI.parse(RECAPTCHA_URL), { :privatekey => private_key, :remoteip => request.env["REMOTE_ADDR"], :challenge => challenge, :response => response }) | |
res.body.index("true") == 0 | |
rescue | |
false | |
end | |
end | |
def show_captcha(public_key = Sinatra::Plugins::Recaptcha::RECAPTCHA_PUBLIC) | |
%{<script type="text/javascript" | |
src="http://api.recaptcha.net/challenge?k=#{public_key}"> | |
</script> | |
<noscript> | |
<iframe src="http://api.recaptcha.net/noscript?k=#{public_key}" | |
height="300" width="500" frameborder="0"></iframe><br> | |
<textarea name="recaptcha_challenge_field" rows="3" cols="40"> | |
</textarea> | |
<input type="hidden" name="recaptcha_response_field" | |
value="manual_challenge"> | |
</noscript>} | |
end | |
end | |
end | |
end | |
# Little hack to make it work with both Sinatra 0.3.2 and latest experimental builds | |
(Sinatra::Base rescue Sinatra::EventContext).send(:include, Sinatra::Plugins::Recaptcha) | |
# EXTENDED CLIENT CODE EXAMPLE | |
# | |
# get '/' do | |
# %{ | |
# <form method="post" action="/submit"> | |
# <input type="text" name="whatever" value="" /> | |
# #{show_captcha} | |
# <input type="submit" /> | |
# </form> | |
# } | |
# end | |
# | |
# post '/submit' do | |
# if captcha_valid?(params[:recaptcha_challenge_field], params[:recaptcha_response_field]) | |
# "CAPTCHA passed" | |
# else | |
# redirect '/' | |
# end | |
# end |
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