Re: [Jython-users] Resticting access

[Edward P. <epo...@te...>]

Thanks,

lol, I have only been using Jython for a week ... having a blast. I still
haven't got used to finding solutions that are ridiculously simple :)
This is a little simpler that writing my own class loader!

-Ed


----- Original Message -----
From: "dman" <ds...@ri...>
To: <jyt...@li...>
Sent: Sunday, November 25, 2001 7:15 PM
Subject: Re: [Jython-users] Resticting access


> On Sun, Nov 25, 2001 at 06:21:24PM -0800, Edward Povazan wrote:
> | Hi,
> |
> | I had been writing a simple script language, and in looking for a run
time
> | environment (as opposed to writing my own interpreter) I discovered my
> | expressions were exactly the same as Python expressions (with a little
> | overloading).
> | So I decided to use Jython instead ... why reinvent the wheel?
> | I will still parse the a python subset to make sure the user (typically
a
> | non programmer) doesn't do something silly.
> | But I want a version for the more adventurous users.
> |
> | How do I restrict Jython use of 'import xxx' and 'from xxx import yyy'
>
> This one is easy :
>
> simply hook in your own function as __import__.
>
>
> The 'import' statement is simply syntactic sugar :
>
> import foo
>
> foo = __import__( "foo" )
>
>
> from foo import bar
>
> bar = __import__( "foo" ).bar
>
>
> import foo as bar
>
> bar = __import__( "foo" )
>
>
> You can (in pure python code) do something like the following :
>
>
> import __builtin__ # this is the namespace where built-in stuff is
> real_import = __builtin__.__import__ # save the real function for later
> def my_import( name , globals , locals , fromlist ) :
>     print "Yo, the user wants to import '%s'" % name
>     return real_import( name , globals , locals , fromlist )
> __builtin__.__import__ = my_import # hook in my function instead
>
>
> In your function you can determine whether or not to allow the import
> or raise ImportError.
>
> HTH,
> -D
>
> --
>
> Religion that God our Father accepts as pure and faultless is this: to
> look after orphans and widows in their distress and to keep oneself from
> being polluted by the world.
>
>
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