Ruby on Rails

> On Jul 12, 2016, at 10:19 AM, Frederick Cheung <frederick.cheung@gmail.com> wrote:
>
>
> On Sunday, July 10, 2016 at 4:28:39 PM UTC+1, Walter Lee Davis wrote:
> I was just looking over some code I wrote last year, and found this in one of my mailers:
>
> @item = eval(params[:item].classify).send(:find, params[:item_id])
>
> The idea here is that I can have the mailer respond to a polymorphic link helper, and respond with an object reference of the referenced object, regardless which it was -- a Project, Campaign, Asset, Lightbox -- whatever. Inside the mailer erb, any links to that object would be as simple as
>
> link_to @item.label, polymorphic_url(@item)
>
> ...so my mailer messages don't have to care what sort of object they are sending a link to. This year, seeing send in the same line as params is giving me the willies. Hence my question here.
>
> Besides adding some guards around which classes I want to allow this for (which just occurred to me as I was typing this out) can you recommend any other techniques to make this less risky? Is there anything built into the framework that I am overlooking?
>
>
>
> I would prefer constantize over eval(foo.classify) and public_send over send. I'd still be happier with a whitelist though, or translating between the class name and some string that represents it - security aside, having an implementation detail leak out like that doesn't smell too good.
>
> Fred

Those are good ideas, thanks, Fred!

Walter

>
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