[Zope3-dev] Re: LDAP Authentication Adapter inside Zope 3 core

[Jim Fulton]

Stephan Richter wrote:
> Hello everyone,
> 
> I am going to fix the LDAP authentication adapter for PAU. Florent, Dylan and 
> Roger have all expressed interest to put the module into the Zope 3 source 
> tree, like ``Zope3/src/ldapauth`` (note the name change to a more neutral 
> one). The problem with that is, of course, that this authentication package 
> requires the ``ldap`` module, which does not ship with the standard Python. 
> Thus Zope 3 would not start up and tests would fail, if someone does not have 
> ``ldap`` installed.
> 
> However, in light of recent developments I think we can overcome the problem.
> 
> (1) Tests
> 
> We only run the ``ldap``-specific tests when the module is installed. The 
> pattern to do this is well-established and should be no problem.

I really don't like this, but I can live with it for now.
We has a lot of pain doing something like this for ZODB.

I really want to get to a packing based solution to this sort of
thing.

> (2) ZCML
> 
> We only want to load the configuration, when the ``ldap`` package is 
> installed. Unfortunately, the ZCML-condition verb "have" is insufficient, 
> since the ``ldap`` package does not come with a ZCML file that defines a 
> feature. I thus propose to implement a second verb called "have-package" or 
> "have-module" that will check whether a particular module is importable. For 
> example::
> 
> <configure
>     zcml:condition="have-package ldap"> ...
> 
> I am open to alternative solutions. For example, we could also have a special 
> "have" verb case where the feature "package" is specially treated:
> ``have package ldap``

How about: "have-module"?  Is there any reason to limit this to packages?

Jim

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