Rails Plugin for adding recaptcha to a form.

1. First, go to recaptcha and sign up for a api key.

2. Next, install the recaptchaed gem: gem install recaptchaed

3. Tell Rails to use the gem Open config/environment.rb and enter the following: config.gem "recaptchaed"

4. Run the generator to create config files and to add customizable error messages script/generate recaptchaed If it runs successfully, you should see the following: create config/recaptchaed.yml create config/initializers/recaptchaed.rb added recaptcha i18n error message to config/locales/en.yml

5. Edit the config/recaptcaed.yml file and add your personal recaptcha public and private api keys

1. Run script/destroy recaptchaed

2. remove any related custom logic from your views and controllers

This example shows how to protect a comment model with a recaptcha

1. Include the recaptcha javascript library in app/views/layouts/comments.html.erb.

   <%=javascript_include_tag 'http://www.google.com/recaptcha/api/js/recaptcha_ajax.js' %>

2. Add the recaptcha markup to the app/views/comments/new.html.erb.

   New comment

   <% form_for(@comment) do |f| %> <%= f.error_messages %>

   <%= f.label :title %>
   <%= f.text_field :title %>

   <%= f.label :body %>
   <%= f.text_area :body %>

   <%= recaptcha_tag (RECAPTCHAED["RECAPTCHA_PUBLIC_KEY"], "recaptcha_div", "blackglass") %>

   <%= f.submit 'Create' %>

   <% end %>

   <%= link_to 'Back', comments_path %>

The recaptcha site has several options for different themes/styles. For example, you can change the theme of the recaptcha to 'white' by passing a different theme string.

<%= recaptcha_tag (RECAPTCHAED["RECAPTCHA_PUBLIC_KEY"], "recaptcha_div", "white") %>

3. Add logic to create action inside the comments controller to validate the captcha.

First, include the library in the comments controller:

class CommentsController < ApplicationController
  include Recaptchaed
  ...rest of controller...
end

Then, protect the create method using the 'validate_captcha(..)' method

  # POST /comments
  # POST /comments.xml
  def create
    @comment = Comment.new(params[:comment])

    @recaptcha = validate_captcha(RECAPTCHAED["RECAPTCHA_PRIVATE_KEY"], request.remote_ip, params['recaptcha_challenge_field'], params['recaptcha_response_field'])

    respond_to do |format|
      if @recaptcha && @recaptcha['success'] && @comment.save	
        flash[:notice] = 'Comment was successfully created.'
        format.html { redirect_to(@comment) }
        format.xml  { render :xml => @comment, :status => :created, :location => @comment }
      else
        if(!@recaptcha['success'])
          @comment.errors.add('recaptcha_response_field', :"recaptcha.invalid")
        end
        format.html { render :action => "new" }
        format.xml  { render :xml => @comment.errors, :status => :unprocessable_entity }
      end
    end
  end

When a user fails to enter the correct captcha, the error message that is displayed is defined inside 'config/locales/en.yml'. Feel free to update that to whatever you like. And, it can also be internationalized, if needed.

Enjoy!

http://upgradingdave.com Copyright (c) 2010 Dave Paroulek, released under the MIT license