[Zope] Accessing httplib from a Zope Python script

[Andreas Jung]

see lib/python/Products/PythonScripts/README.txt

--On Donnerstag, 27. M=E4rz 2003 8:50 Uhr -0700 Sean Winstead=20
<seanw@surehand.com> wrote:

> Hi,
>
> I'm a Zope newbie who's more familiar with C# than Python. I've
> encountered an obstacle and am unable to find what's wrong with my
> approach. In order to solve the problem, I have searched this group's
> archive as well as other resources on the web. Some posts earlier this
> month were related to the problem but didn't address it exactly.
>
> I'm trying to implement support for PayPal Instant Payment Notification
> (IPN). IPN sends a POST to a URL on our Zope server. I decided to
> implement a Python script to handle the POST. The first task of the
> script is to send a POST back to PayPal in order to verify the
> transaction originated from PayPal.
>
> To do that, I learned that I could use the features in the httplib
> module. However, if I have a crappy test script like the following:
>
>   import httplib
>   result =3D httplib.HTTP("http://www.paypal.com/cgi-bin/webscr")
>   return result
>
> Then I receive the following error when posting to the page:
>
>   Error Type: Unauthorized
>   Error Value: You are not allowed to access HTTP in this context
>
> In my search for help, I learned that Zope allows Script objects to
> access a subset of the Python modules, so I assumed that was the reason
> for the error. In my search for help, I happened upon some articles
> about using External methods to access modules. So I put the "result =3D
> httplib..." line into function verifyPayPal, module ipnSupport.py within
> the Zope\Extensions subfolder. I then added the extension to the same
> folder containing the Python script. The extension has ID ipnSupport,
> referening the specified script and function. When I run the following
> script...
>
>   result =3D verifyPayPal
>   return result
>
> The following error is returned:
>
>   Error Type: NameError
>   Error Value: global name 'verifyPayPal' is not defined
>
> The same error occurs if I call ipnSupport instead of verifyPayPal. If I
> try to import module ipnSupport then the following error is returned:
>
>   Error Type: ImportError
>   Error Value: import of "ipnSupport" is unauthorized
>
> So I guess my questions are:
>
> 1. Why can I not import httplib into a Zope Python script object?
>
> 2. Is an external method only callable from a DTML object? If it can be
> called from a script object, how do I do that?
>
> Thanks for any help or clues you can provide.
>
> --
> Sean Winstead
>
>
>
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