[PATCH] add support for getVirtualRoot() or similar to the REQUEST object

[Darryl Dixon]

Similarly to:
https://bugs.launchpad.net/zope2/+bug/142909 and https://bugs.launchpad.net/zope2/+bug/143217

It is very useful (in fact, necessary in certain scenarios) to have access to the virtual root/path information that is stored in the _script attribute of the REQUEST object.
For example, it may be useful to set a Zope-specific cookie for a domain where multiple systems share the domain name; if Zope lives at:
http://www.example.com/zope
then when setting cookies, you want to be able to specify the path of '/zope' for the cookie. Zope session cookies, for example, would need this ability if you had, eg:
http://www.example.com/zopeA and
http://www.example.com/zopeB
for two different systems both being powered by Zope.

Or, similarly, with ESI setups or similar, you may want to be able to turn out pages that make all links look like: "/url/path" instead of "http://www.example.com/url/path", so that protocol information is not hard-coded in the page.

Exposing access to the _script attribute is relatively trivial, a method similar to the following inside HTTPRequest.py would be sufficient:
def getVirtualRoot(self):
    x = '/' + '/'.join(self._script)
    if x == '/':
        x = ''
        # Could also be set to x = '/.', but that may be misleading...
    return x

[Andreas Jung (ajung)]

The patch requires a unittest.

[Tres Seaver (tseaver)]

I will attach a patch with a cleaner implementation.

[Tres Seaver (tseaver)]

Unit tests should cover both the case that '_script' empty an that it is not empty.

[Jens Vagelpohl (dataflake-deactivatedaccount-deactivatedaccount)]

Aded Tres' patch and a test...

Zope 2.12 branch: http://svn.zope.org/?view=rev&rev=115797

Zope trunk: http://svn.zope.org/?view=rev&rev=115798