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Pål Bergström

2010-Jul-09 09:44 UTC

Problem with reading cgi cookie

Why doesn''t this work in a controller, or in a file in a module in
/lib:

require ''cgi''
cgi = CGI.new
test = cgi.cookies["mycookie"][0]

cgi.cookies doesn''t get the cookie.

But this cgi script does:

require ''cgi''
cgi = CGI.new(''html4'')
cookie_name = ''mycookie''
val_string = cgi.cookies[cookie_name][0]
cgi.out {
    cgi.html {
        cgi.head { cgi.title {"Cookies"} } +
            cgi.body {
       cgi.p {"name: #{cookie_name}" } +
             cgi.p {"value: #{val_string}"}
        }
    }
}
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Frederick Cheung

2010-Jul-09 10:13 UTC

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Re: Problem with reading cgi cookie

On Jul 9, 10:44 am, Pål Bergström
<li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:> Why doesn''t this work in a controller, or in a file in a module in
/lib:
>
> require ''cgi''
> cgi = CGI.new
> test = cgi.cookies["mycookie"][0]
>Rails doesn''t use CGI anymore as the interface between it and the
outside world (it uses rack instead) which probably broke that.

Controllers have an instance method called cookies which returns a
hash like object containing your cookies.

Fred
> cgi.cookies doesn''t get the cookie.
>
> But this cgi script does:
>
> require ''cgi''
> cgi = CGI.new(''html4'')
> cookie_name = ''mycookie''
> val_string = cgi.cookies[cookie_name][0]
> cgi.out {
>     cgi.html {
>         cgi.head { cgi.title {"Cookies"} } +
>             cgi.body {
>        cgi.p {"name: #{cookie_name}" } +
>              cgi.p {"value: #{val_string}"}
>         }
>     }}
>
> --
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Pål Bergström

2010-Jul-09 10:29 UTC

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Re: Problem with reading cgi cookie

Frederick Cheung wrote:
s doesn''t use CGI anymore as the interface between it and
the> outside world (it uses rack instead) which probably broke that.
> 
> Controllers have an instance method called cookies which returns a
> hash like object containing your cookies.
> 
> Fred
I see. Strange that it works on my machine locally.

I regularly use rails cookie instance in my rails app. But I can''t use 
it in a module in a file in /app/lib, right? That''s why I used cgi.

The thing is, before save and show I encrypt certain fields in the 
database using the gem fast_aes, and the key is in a cookie. In each 
model I use before_save and after_find. How can I get the value of that 
cookie without using cgi?
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Pål Bergström

2010-Jul-09 11:56 UTC

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Re: Problem with reading cgi cookie

Frederick Cheung wrote:
> uses rack

How do I read a cookie with rack? Trying to find the answer through 
Google but witout luck.

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Peter De Berdt

2010-Jul-09 12:13 UTC

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Re: Re: Problem with reading cgi cookie

On 09 Jul 2010, at 13:56, Pål Bergström wrote:
>> uses rack
>
> How do I read a cookie with rack? Trying to find the answer through
> Google but witout luck.
This should help:

http://github.com/dewind/rack-cookie-monster/blob/master/lib/rack/cookie_monster.rb


Best regards

Peter De Berdt

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Pål Bergström

2010-Jul-09 12:27 UTC

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Re: Re: Problem with reading cgi cookie

Peter De Berdt wrote:> On 09 Jul 2010, at 13:56, Pål Bergström wrote:
> This should help:
> 
>
http://github.com/dewind/rack-cookie-monster/blob/master/lib/rack/cookie_monster.rb
> 

It did. Just a stupid question :-)

How do I use env?
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Peter De Berdt

2010-Jul-09 12:38 UTC

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Re: Re: Re: Problem with reading cgi cookie

On 09 Jul 2010, at 14:27, Pål Bergström wrote:
>> This should help:
>>
>>
http://github.com/dewind/rack-cookie-monster/blob/master/lib/rack/cookie_monster.rb
>>
>
>
> It did. Just a stupid question :-)
>
> How do I use env?
What do you mean? The environment is passed in with the required call  
method from the rack middleware.


Best regards

Peter De Berdt

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Pål Bergström

2010-Jul-09 12:44 UTC

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Re: Re: Re: Problem with reading cgi cookie

Peter De Berdt wrote:
> What do you mean? The environment is passed in with the required call
> method from the rack middleware.
I don''t know. I just want to get a cookie value in a script in a file
in
railsapp/lib. I thought this would do it:

req = Rack::Request.new(env)
req.cookies()

But I get "undefined local variable or method `env''"
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Peter De Berdt

2010-Jul-09 13:20 UTC

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Re: Re: Re: Re: Problem with reading cgi cookie

On 09 Jul 2010, at 14:44, Pål Bergström wrote:
>> What do you mean? The environment is passed in with the required call
>> method from the rack middleware.
>
> I don''t know. I just want to get a cookie value in a script in a  
> file in
> railsapp/lib. I thought this would do it:
>
> req = Rack::Request.new(env)
> req.cookies()
>
> But I get "undefined local variable or method `env''"

Well, to get started with middlewares, it''s a good thing to read up on
how Rails is using it:
http://guides.rails.info/rails_on_rack.html

In your case, something like this would probably do the trick:

http://gist.github.com/469445

That''s the basic structure. How you handle those cookies and what you  
want to do with it will determine how you pass it on into the Rails  
app. Google should be able to help you out there, since there''s lots  
of middlewares out there that will do something similar to what you  
want to do.


Best regards

Peter De Berdt

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Pål Bergström

2010-Jul-09 14:08 UTC

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Re: Re: Re: Re: Problem with reading cgi cookie

Peter De Berdt wrote:> On 09 Jul 2010, at 14:44, Pål Bergström wrote:
> Well, to get started with middlewares, it''s a good thing to read
up on
> how Rails is using it:
> http://guides.rails.info/rails_on_rack.html

Too much to get into now. And you script (thank you very much for you 
effort :-) ) is much more than what I''ve used before with cgi.

require ''cgi''
cgi = CGI.new
test = cgi.cookies["mycookie"][0]

So, getting the value from a cookie into a model is that hard?
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Pål Bergström

2010-Jul-09 14:26 UTC

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Re: Re: Re: Re: Problem with reading cgi cookie

I would just like to get the value of a particular cookie in a file in 
/lib. Is there any other way without rack?
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Peter De Berdt

2010-Jul-09 14:34 UTC

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Re: Re: Re: Re: Re: Problem with reading cgi cookie

On 09 Jul 2010, at 16:26, Pål Bergström wrote:
> I would just like to get the value of a particular cookie in a file in
> /lib. Is there any other way without rack?
Why are you overcomplicating things so much? Cookies are part of the  
request/response cycle and have nothing to do with models (MVC  
remember, separation of logic). If you want to pass controller data  
into a model or a custom class, you pass it as a parameter. In case of  
your /lib file (which is a custom class I presume):

class FooBar

   def initialize(mycookievariable)
       # do something with mycookievariable
   end

   def somemethod
       # etc.
   end

end

and in your controller:

   def show
      my_foo_bar = FooBar.new(cookies[:mycookievariable)
   end


Best regards

Peter De Berdt

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Pål Bergström

2010-Jul-09 15:02 UTC

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Re: Re: Re: Re: Re: Problem with reading cgi cookie

Peter De Berdt wrote:
> Why are you overcomplicating things so much? 
Good question. :-) It''s so much easier when you have a
"programmers"
brain. I don''t.

Thanks for your suggestion. But how do I get the value of a cookie in 
the model?
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Peter De Berdt

2010-Jul-09 16:21 UTC

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Re: Re: Re: Re: Re: Re: Problem with reading cgi cookie

On 09 Jul 2010, at 17:02, Pål Bergström wrote:
>> Why are you overcomplicating things so much?
>
> Good question. :-) It''s so much easier when you have a
"programmers"
> brain. I don''t.
>
> Thanks for your suggestion. But how do I get the value of a cookie in
> the model?
You pass it as a parameter to the model method, just like I passed it  
into a custom class.

class FooBar  < ActiveRecord::Base

    def some_method(cookievalue)
       # do something here
    end

end

# In the controller

FooBar.some_method(cookies[:myvalue])


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Peter De Berdt

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Peter De Berdt

2010-Jul-09 16:25 UTC

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Re: Re: Re: Re: Re: Re: Problem with reading cgi cookie

On 09 Jul 2010, at 17:02, Pål Bergström wrote:
>> Why are you overcomplicating things so much?
>
> Good question. :-) It''s so much easier when you have a
"programmers"
> brain. I don''t.
>
> Thanks for your suggestion. But how do I get the value of a cookie in
> the model?

... or if you just want to make it a field value:

# In controller

    def create
       MyModel.create(params[:my_model].merge(:some_field =>  
cookies[:some_cookie]))
    end

No need to juggle around and just mass-assign using a hash, like  
demonstrated above.


Best regards

Peter De Berdt

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Pål Bergström

2010-Jul-09 18:43 UTC

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Re: Re: Re: Re: Re: Re: Problem with reading cgi cookie

Peter De Berdt wrote:> On 09 Jul 2010, at 17:02, Pål Bergström wrote:
> 
> ... or if you just want to make it a field value:
> 
That was smart. Thanks. :-)
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Pål Bergström

2010-Jul-26 16:38 UTC

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Re: Re: Re: Problem with reading cgi cookie

Pål Bergström wrote:
> req = Rack::Request.new(env)
> req.cookies()
> 

I still have problem. I just want to read a damn cookie. Why doesn''t 
this work?
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Robert Walker

2010-Jul-26 18:14 UTC

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Re: Re: Re: Problem with reading cgi cookie

Pål Bergström wrote:> I still have problem. I just want to read a damn cookie. Why
doesn''t
> this work?
  def create
    @user = User.new(params[:user])
    cookies[:user_name] = "david"
    ....
    ....
  end

Sets a :user_name cookie with value "david" upon creating a user


  def index
    @users = User.all
    @cookie_count = cookies.size
    @user_name_cookie = cookies[:user_name] if @cookie_count > 0
    ....
    ....
  end

Reads the :user_name cookie when listing users.

<p>There are <%= @cookie_count %> cookies in request.</p>
<p>The :user_name cookie value is: <%= @user_name_cookie
%></p>

Show the number of cookies and the value of the :user_name cookie 
("david").

Note: This is a useless contrived example showing use of the "cookies"
method, but notice once you have the cookie value you can do whatever 
you want with it, including passing it into a model.
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Pål Bergström

2010-Jul-26 19:01 UTC

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Re: Re: Re: Problem with reading cgi cookie

Robert Walker wrote:
> 
>   def create
>     @user = User.new(params[:user])
>     cookies[:user_name] = "david"
>     ....
>     ....
>   end
> 
> Sets a :user_name cookie with value "david" upon creating a user
> 
> 
>   def index
>     @users = User.all
>     @cookie_count = cookies.size
>     @user_name_cookie = cookies[:user_name] if @cookie_count > 0
>     ....
>     ....
>   end
> 
> Reads the :user_name cookie when listing users.
> 
> <p>There are <%= @cookie_count %> cookies in request.</p>
> <p>The :user_name cookie value is: <%= @user_name_cookie
%></p>
> 
> Show the number of cookies and the value of the :user_name cookie 
> ("david").
> 
I don''t want to set a cookie. That''s never been a problem. I
would like
to read a cookie and get the value into models so I can access it when 
using a before_save.
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Robert Walker

2010-Jul-26 21:24 UTC

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Re: Re: Re: Problem with reading cgi cookie

Pål Bergström wrote:>>   def index
>>     @users = User.all
>>     @cookie_count = cookies.size
>>     @user_name_cookie = cookies[:user_name] if @cookie_count > 0
>>     ....
>>     ....
>>   end
> I don''t want to set a cookie. That''s never been a
problem. I would like
> to read a cookie and get the value into models so I can access it when 
> using a before_save.
I though I had made that clear. You read the cookie value as shown in 
above index method of the controller then you pass that value to the 
model object.

If you don''t know how to pass a variable to a method, then I''d
suggest
learning something about Ruby before you try to write a Rails 
application. I don''t know how to make this any more clear.
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Pål Bergström

2010-Jul-26 21:49 UTC

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Re: Re: Re: Problem with reading cgi cookie

Robert Walker wrote:> Pål Bergström wrote:
> I though I had made that clear. You read the cookie value as shown in 
> above index method of the controller then you pass that value to the 
> model object.
> 
> If you don''t know how to pass a variable to a method, then
I''d suggest
> learning something about Ruby before you try to write a Rails 
> application. I don''t know how to make this any more clear.
Sorry but I don''t understand you. And I have a feeling you
don''t
understand me.

Let me ask you this instead; is there a way to get the value of a cookie 
in a model?
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Greg Donald

2010-Jul-26 21:59 UTC

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Re: Re: Re: Re: Problem with reading cgi cookie

2010/7/26 Pål Bergström
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>:> Sorry but I don''t understand you. And I have a feeling you
don''t
> understand me.
>
> Let me ask you this instead; is there a way to get the value of a cookie
> in a model?
That breaks encapsulation.  The model should never care what your
cookies are doing.  Only controllers should care about cookies.

That being said..

When you use the model to create an instance of an ActiveRecord
object, generally you will pass in the params from a form, something
like this:

User.create( params[:user] )

params is a type of hash, and Hash has merge.  So you can add stuff to
the params before passing it to the model, something like:

params.merge( :my_cookie => cookies[:my_cookie] )


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Pål Bergström

2010-Jul-26 22:27 UTC

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Re: Re: Re: Re: Problem with reading cgi cookie

Greg Donald wrote:> 2010/7/26 P�l Bergstr�m
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>:
> params is a type of hash, and Hash has merge.  So you can add stuff to
> the params before passing it to the model, something like:
> 
> params.merge( :my_cookie => cookies[:my_cookie] )

That I know. I was hoping to do something similar to what I had before, 
when I could use cgi. Something easy using before_save and after_find.

What I want to achieve is to aes encrypt selected columns in the 
database using a key stored in the users browser as a cookie. I do it ( 
or used to do it) like this.

In each model I have a before_save and after_find. There I pass the 
value from the params, or from the database after find, to a module 
where the string was either encrypted or decrypted with the key stored 
in a cookie. That cookie was fetched with the help of cgi in the module. 
It worked great. But not now, as Rack is taking the place of cgi.
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Greg Donald

2010-Jul-27 00:19 UTC

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Re: Re: Re: Re: Re: Problem with reading cgi cookie

2010/7/26 Pål Bergström
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>:> That I know. I was hoping to do something similar to what I had before,
> when I could use cgi. Something easy using before_save and after_find.
>
> What I want to achieve is to aes encrypt selected columns in the
> database using a key stored in the users browser as a cookie. I do it (
> or used to do it) like this.
>
> In each model I have a before_save and after_find. There I pass the
> value from the params, or from the database after find, to a module
> where the string was either encrypted or decrypted with the key stored
> in a cookie. That cookie was fetched with the help of cgi in the module.
> It worked great. But not now, as Rack is taking the place of cgi.
I would just add the functionality to ActiveRecord:

Build a module that does the AES stuff:

module MyAes

  def self.append_features( base )
    base.before_save do |model|
      model.encrypted_stuff = encrypt( model.plain_old_data ) if
model.respond_to?( :plain_old_data )
    end
  end

  def self.append_features( base )
    base.after_find do |model|
      model.plain_old_data = decrypt( model.encrypted_stuff ) if
model.respond_to?( :plain_old_data )
    end
  end

end

Mix the module into ActiveRecord, in environment.rb:

class ActiveRecord::Base
  include MyAes
end


class Foo < ActiveRecord::Base
  attr_accessor :plain_old_data
end



-- 
Greg Donald
destiney.com | gregdonald.com

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Frederick Cheung

2010-Jul-27 07:10 UTC

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Re: Problem with reading cgi cookie

On Jul 26, 11:27 pm, Pål Bergström
<li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:> Greg Donald wrote:
> > 2010/7/26 P l Bergstr m
<li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>:
> > params is a type of hash, and Hash has merge.  So you can add stuff to
> > the params before passing it to the model, something like:
>
> > params.merge( :my_cookie => cookies[:my_cookie] )
>
> That I know. I was hoping to do something similar to what I had before,
> when I could use cgi. Something easy using before_save and after_find.
>
With CGI the interface between the webserver and rails is essentially
a whole bunch of environment variables, which can of course be read
anywhere. That''s why you can create an instance of CGI and it gets all
the request parameters out of thin air. Rack isn''t like that so it
just isn''t possible to devine the current request object out of thin
air.
You could I suppose have a before filter in your requests that would
stash the current request object (or its cookies) in thread local
storage. Both this and your existing solution break encapsulation as
others have said. For example it would be a real mess if you ever
wanted to call any of these cookie using methods from a standalone
mess because you''d have mess around create fake cookies.

Fred

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Pål Bergström

2010-Jul-27 09:17 UTC

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Re: Re: Re: Re: Re: Problem with reading cgi cookie

Greg Donald wrote:
> I would just add the functionality to ActiveRecord:
Where does the unique aes key comes in, the user cookie?
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Dave Aronson

2010-Jul-27 15:45 UTC

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Re: Re: Re: Re: Re: Problem with reading cgi cookie

2010/7/26 Pål Bergström <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>:
> What I want to achieve is to aes encrypt selected columns in the
> database using a key stored in the users browser as a cookie.
Are you doing this over https, or just plain http?

-Dave

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Programming Blog: http://codosaur.us | Work: http://davearonson.com
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Pål Bergström

2010-Jul-27 15:53 UTC

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Re: Re: Re: Re: Re: Problem with reading cgi cookie

Dave Aronson wrote:
> Are you doing this over https, or just plain http?
For now just over http. But eventually with ssl.
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Dave Aronson

2010-Jul-27 15:56 UTC

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Re: Re: Re: Re: Re: Re: Problem with reading cgi cookie

2010/7/27 Pål Bergström <lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>:
> Dave Aronson wrote:
>
>> Are you doing this over https, or just plain http?
>
> For now just over http. But eventually with ssl.
Before this goes live?

-Dave

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Pål Bergström

2010-Jul-27 16:06 UTC

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Re: Re: Re: Re: Re: Re: Problem with reading cgi cookie

Dave Aronson wrote:
>> For now just over http. But eventually with ssl.
> 
> Before this goes live?
> 
>
Yes. It doesn''t matter. The key in the cookie has nothing to do with
the
overall security. It''s just an extra layer of security for the user, 
encrypted with aes. E.g. I don''t want to see certain info in the 
database when I look at it from the backend.
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Pål Bergström

2010-Jul-27 16:09 UTC

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Re: Re: Re: Re: Re: Problem with reading cgi cookie

Pål Bergström wrote:> Greg Donald wrote:
> 
>> I would just add the functionality to ActiveRecord:
> 
> Where does the unique aes key comes in, the user cookie?
It''s a unique user key for use with fast_aes in order to encrypt
certain
data in the database.
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Rails - Jul 2010 - Problem with reading cgi cookie

Problem with reading cgi cookie

Re: Problem with reading cgi cookie

Re: Problem with reading cgi cookie

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