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POGem-idea: Automatic spam protection with captcha in before_filter when HTTP-method is post,put or delete
 

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  1. POGem-idea: Automatic spam protection with captcha in before_filter when HTTP-method is post,put or delete
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    <p>I'm thinking about writing an automatic spam protection system (maybe I will write a public gem) for rails.</p> <p>My concept is to include a helper method in application_controller f.e.:</p> <pre><code>class ApplicationController &lt; ActionController::Base automatic_captcha_redirect(:min_time =&gt; 30.seconds :limit =&gt; 50) ... end </code></pre> <p>Then I want to include automatical a before_filter in every controller, which checks, if the current request is via post, put or delete-method.</p> <p>If the user's last post-request is smaller than :min_time, then the request should be redirected to an captcha-input-page (the posted user-data resides in hidden html fields).</p> <pre><code># before_filter :check_spam def check_spam if !request.get? &amp;&amp; session[:last_manipulation_at] &amp;&amp; session[:last_manipulation_at] &gt;= DateTime.now - 30.seconds redirect_to captcha_path # (doesn't know yet how to handle the post data to # display in hidden fields in the spam-captcha-form) end end </code></pre> <p>And in captcha.haml</p> <pre><code>=form_tag -request.params.each do |key, value| =hidden_field_tag key, value =captcha_image =submit_button_tag </code></pre> <p>If the user submits the right captcha-word, his data will be posted to the right action.</p> <p>Do you think thats realizable? Any critics or suggestions? Or an idea how to realize this behaviour?</p> <p><strong>EDIT:</strong></p> <ul> <li>this should not pass through all the ActiveRecord stack; can't it be implemented as a middleware hook (Rails Rack)? <ul> <li>Yes, would be a good idea - but I'm not very familiar with rails rack :/</li> </ul></li> <li>what about file uploads? (you can not store it in a hidden file) <ul> <li>Hm... maybe a check if there is a file in the post? (How could that be realized?)</li> </ul></li> <li>what about Ajax posting? <ul> <li>Maybe sending back http-status codes (f.e. 503 Service temporary unavailable)</li> </ul></li> <li>why only POST and not also PUT and DELETE? <ul> <li>corrected this in my question</li> </ul></li> </ul> <p><strong>EDIT:</strong></p> <p>First structure of processing (as non rack-app - I dont know how to write rack apps):</p> <p>0) Settings in environment.rb</p> <pre><code>auto_recaptcha[:limit] = 10 auto_recaptcha[:min_time] = 1.minute </code></pre> <p>1) User posts data </p> <p>Check last_manipulation and max. amount of allowed manipultations in application_controller.rb</p> <pre><code>class ApplicationController &lt; ActionController::Base before_filter :automatic_captcha_redirect def automatic_captcha_redirect session[:last_manipulation_at][:manipultation] = [] unless session[:last_manipulation_at][:manipultation] # Checks if requests are falling under the specifications for showing captcha if !request.get? &amp;&amp; session[:last_manipulation_at][:date] &gt; DateTime.now - auto_recaptcha[:min_time] &amp;&amp; session[:last_manipulation_at][:manipultation].count &lt; auto_recaptcha[:limit] # If user answered captcha, verify it if !verify_captcha(params) @url = request.url @params = request.params render "layouts/captcha.haml" else # Add successfull manipulation to counter session[:last_manipulation_at][:manipultation] &lt;&lt; DateTime.now session[:last_manipulation_at][:date] = DateTime.now end end end end </code></pre> <p>captcha.haml</p> <pre><code>-form_tag @url do -request.params.each do |key, value| =hidden_field_tag key, value =captcha_image =submit_button_tag </code></pre> <p>2) ... ... ...</p> <p>last) Post userdata to the right location</p> <pre><code>post(params) =&gt; users_path # path "/users" with method: post </code></pre>
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