Sreejith K wrote:
On Feb 18, 3:49 pm, Jean-Michel Pichavant <jeanmic...@sequans.com>
wrote:
Sreejith K wrote:
On Feb 18, 1:57 pm, Steven D'Aprano
<ste...@remove.this.cybersource.com.au> wrote:
On Thu, 18 Feb 2010 00:03:51 -0800, Jonathan Gardner wrote:
On Feb 17, 10:48 pm, Sreejith K <sreejith...@gmail.com> wrote:
Hi everyone,
I need to implement custom import hooks for an application
(http://www.python.org/dev/peps/pep-0302/). I want to restrict an
application to import certain modules (say socket module). Google app
engine is using a module hook to do this (HardenedModulesHook in
google/ appengine/tools/dev_appserver.py). But I want to allow that
application to use an sdk module (custom) which imports and uses socket
module. But the module hook restricts the access by sdk. Finding out,
which file is importing a module give a solution?? ie. If the
application is importing socket module, I want to restrict it. But if
the sdk module is importing socket I want to allow it. Is there any way
I can do this ?
Application
========
import sdk
import socket # I dont want to allow this (need to raise
ImportError)
SDK
====
import socket # need to allow this
SDK
===
import socket
App
===
import SDK
import sys
socket = sys.modules['socket']
I'm not sure, but I think Sreejith wants to prohibit imports from the App
layer while allowing them from the SDK layer, not work around a
prohibition in the SDK layer.
In other words, he wants the import hook to do something like this:
if module is socket and the caller is not SKD:
prohibit
else
allow
I could be wrong of course.
--
Steven
@Steven, Thats exactly what I want.. Anyway to do that ??
import sys
sys.modules['socket'] = None
import socket
---------------------------------------------------------------------------
ImportError Traceback (most recent call last)
ImportError: No module named socket
JM
@Jean. Thanks for the reply. But this is not what I wanted. The import
hook already restricts socket imports in applications. But I want them
in sdk package (alone) which is being imported in the application. I
don't want applications to directly use the socket module. That means
I want to make some exceptions for sdk in import hooks.
give us your code (the hook import)
in your entry file:
import socket
import sys
sys.modules['sdkSocket'] = sys.modules['socket'] # allow to import
socket ad sdkSocket
sys.modules['socket'] = None # forbid to import socket
del socket
within your SDK:
import sdkSocket # actually the socket module
print sdkSocket.__file__
'/usr/lib/python2.5/socket.pyc'
JM
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