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A server-side control to avoid double-submission of html forms with sensitive data
Ruby
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Herval Freire authored
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README

= Double Submit Protection Plugin =
===================================

This plugin implements a symetrical token approach to avoid duplicate posts of data. This is specially
useful when you're dealing with data-sensitive forms (credit-card processing, for instance), where
a duplicated posting may lead to a user getting charged twice. This control is done via a
token placed on user's form and synchronized with the session - whenever the token is different, you
can simply verify it on the controllers by using the 'double_submit?' method

Version History
===============

v1.0 <-- You are here
- Initial release of the plugin

v1.1 (still to be released)
- Automatic support for token as an attribute (e.g. form_for :something, :url => {}, :double_submit_protection => true }
- Save the cheerleader, save the world

Usage Example
=============

some_view.html.erb
----------------------------------------------------------------------
<%= form_for :blah, :url => { :action => "create" } do |f| %>
  ... (some form content here)
  <%=double_submit_token %>
<% end %>
----------------------------------------------------------------------

blah_controller.rb
  def create
    if double_submit?
      flash[:message] = 'Whoa, hang in there dude...'
      render :action => :register
      return
    end

    # do something here
  end
end

----------------------------------------------------------------------

============================

Copyright (C) 2008 Herval Freire (hervalfreire@gmail.com). No license intended - you are free to duplicate,
immitate, print this code and shred it to pieces, blog about it, take pictures with it and even say it was
 brilliantly developed by yourself and brag about it.
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