Incorrectly processing "If-Modified-Since" request header in zope.app.file

[Kirill Kuzminykh]

In function zope.app.file.browser.file.FileView.show() (and z3c.blobfile.browser.file.FileView.show()) file modification date and date from Request Header "If-Modified-Since" are incorrectly compared.
Value of file modification date calculate as:
>> lmt = zope.datetime.time(modified.isoformat())
type(lmt) == float

Value of date from Request Header "If-Modified-Since" calculate as:
>> mod_since = long(zope.datetime.time(header))
type(mod_since) == long

As a result - lmt almost always is more than mod_since on some milliseconds. For example:
lmt = 1243412922.51
mod_since = 1243412922

Doctest for zope.app.file.browser.file.FileView.show() incorect tests "If-Modified-Since" request header, therefore errors was not.

I correct tests and code "zope.app.file.browser.file.FileView.show" method.

[Tres Seaver (tseaver)]

This bug should be tracked against the zope.app.file package, which is now released separately:

  http://pypi.python.org/pypi/zope.app.file

There is (currently) no Launchpad project for that package.