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##############################################################################
#
# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Publication Traverser
"""
__docformat__ = 'restructuredtext'
from types import StringTypes
from zope.component import queryMultiAdapter
from zope.publisher.interfaces import NotFound
from zope.security.checker import ProxyFactory
from zope.traversing.namespace import namespaceLookup
from zope.traversing.namespace import nsParse
from zope.traversing.interfaces import TraversalError
from zope.publisher.interfaces import IPublishTraverse
from zope.publisher.interfaces.browser import IBrowserPublisher
class PublicationTraverser(object):
"""Traversal used for publication.
The significant differences from
zope.traversing.adapters.traversePathElement() are:
- Instead of adapting each traversed object to ITraversable, this
version multi-adapts (ob, request) to IPublishTraverse.
- This version wraps a security proxy around each traversed object.
- This version raises NotFound rather than LocationError.
- This version has a method, traverseRelativeURL(), that
supports "browserDefault" traversal.
"""
def proxy(self, ob):
return ProxyFactory(ob)
def traverseName(self, request, ob, name):
nm = name # the name to look up the object with
if name and name[:1] in '@+':
# Process URI segment parameters.
ns, nm = nsParse(name)
if ns:
try:
ob2 = namespaceLookup(ns, nm, ob, request)
except TraversalError:
raise NotFound(ob, name)
return self.proxy(ob2)
if nm == '.':
return ob
if IPublishTraverse.providedBy(ob):
ob2 = ob.publishTraverse(request, nm)
else:
# self is marker
adapter = queryMultiAdapter((ob, request), IPublishTraverse,
default=self)
if adapter is not self:
ob2 = adapter.publishTraverse(request, nm)
else:
raise NotFound(ob, name, request)
return self.proxy(ob2)
def traversePath(self, request, ob, path):
if isinstance(path, StringTypes):
path = path.split('/')
if len(path) > 1 and not path[-1]:
# Remove trailing slash
path.pop()
else:
path = list(path)
# Remove single dots
path = [x for x in path if x != '.']
path.reverse()
# Remove double dots
while '..' in path:
l = path.index('..')
if l < 0 or l+2 > len(path):
break
del path[l:l+2]
pop = path.pop
while path:
name = pop()
ob = self.traverseName(request, ob, name)
return ob
def traverseRelativeURL(self, request, ob, path):
"""Path traversal that includes browserDefault paths"""
ob = self.traversePath(request, ob, path)
while True:
adapter = IBrowserPublisher(ob, None)
if adapter is None:
return ob
ob, path = adapter.browserDefault(request)
ob = self.proxy(ob)
if not path:
return ob
ob = self.traversePath(request, ob, path)
# alternate spelling
PublicationTraverse = PublicationTraverser
class PublicationTraverserWithoutProxy(PublicationTraverse):
def proxy(self, ob):
return ob
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