Rails - Feb 2013 - how to use before_filter to decrypt post data

hello, everybody.
in ror, we can add a after_filter to a controller.

 def aes_encrypt
    response.body = AesHelper.aes_encrypt(response.body)
  end

 after_filter :aes_encrypt   

and all action''s repsonse int the controller can be encrypt.

and my question is , how to decrypt data use before_filter, or anything 
else.

ex: i want to post json data to /usr/register,   the json data is 
{"name":"good", "password":"nice"}.
encrypt it to
5B2YC7WzgFmaivnATP1ZLR4sTXB3SsWEUeMpUbcYiylcvHxfSStYIBqwIMCjZAY3

so i post 5B2YC7WzgFmaivnATP1ZLR4sTXB3SsWEUeMpUbcYiylcvHxfSStYIBqwIMCjZAY3 
 to /usr/register

in action register , i would write code like this:
#### already decrypt.
def register
   User.register(params[:name], params[:passport])
end

so, how can i decrypt 
5B2YC7WzgFmaivnATP1ZLR4sTXB3SsWEUeMpUbcYiylcvHxfSStYIBqwIMCjZAY3 before 
action register to use params directly in register

thanks for anybody''s help!!



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http://guides.rubyonrails.org/action_controller_overview.html#filters Here
you''ll get a clear description about how to use Filters.
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Best Regards,
Ryan Cheung


On Thu, Feb 28, 2013 at 11:00 AM, 卓一抗 <zhuoyikang@gmail.com> wrote:
> hello, everybody.
> in ror, we can add a after_filter to a controller.
>
>  def aes_encrypt
>     response.body = AesHelper.aes_encrypt(response.body)
>   end
>
>  after_filter :aes_encrypt
>
> and all action''s repsonse int the controller can be encrypt.
>
> and my question is , how to decrypt data use before_filter, or anything
> else.
>
> ex: i want to post json data to /usr/register,   the json data is
> {"name":"good", "password":"nice"}.
encrypt it to
> 5B2YC7WzgFmaivnATP1ZLR4sTXB3SsWEUeMpUbcYiylcvHxfSStYIBqwIMCjZAY3
>
> so i post 5B2YC7WzgFmaivnATP1ZLR4sTXB3SsWEUeMpUbcYiylcvHxfSStYIBqwIMCjZAY3
>  to /usr/register
>
> in action register , i would write code like this:
> #### already decrypt.
> def register
>    User.register(params[:name], params[:passport])
> end
>
> so, how can i decrypt
> 5B2YC7WzgFmaivnATP1ZLR4sTXB3SsWEUeMpUbcYiylcvHxfSStYIBqwIMCjZAY3 before
> action register to use params directly in register
>
> thanks for anybody''s help!!
>
>
>
>  --
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>
>
>
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