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# Copyright (c) 2002, 2005 Allan Saddi <allan@saddi.com>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# $Id$
__author__ = 'Allan Saddi <allan@saddi.com>'
__version__ = '$Revision$'
__all__ = ['Resolver']
class Resolver(object):
"""
Abstract base class for 'Resolver' objects. (An instance of which is
passed to Publisher's constructor.)
Given a Request, either return a callable (Publisher expects it to
be a function, method, class, or callable instance), or return None.
Typically Request.pathInfo is used to resolve the function.
Request.environ may be modified by the Resolver, for example, to re-adjust
SCRIPT_NAME/PATH_INFO after successful resolution. It is NOT recommended
that it be modified if resolution fails.
When resolving an InternalRedirect, redirect will be True.
"""
def resolve(self, request, redirect=False):
raise NotImplementedError, self.__class__.__name__ + '.resolve'
def _updatePath(self, request, num):
"""
Utility function to update SCRIPT_NAME and PATH_INFO in a sane
manner. Transfers num components from PATH_INFO to SCRIPT_NAME.
Keeps URL path parameters intact.
"""
assert num >= 0
if not num:
return # Nothing to do
numScriptName = len(request.scriptName.split('/'))
totalPath = request.scriptName + request.pathInfo
if __debug__:
origTotalPath = totalPath
# Extract and save params
i = totalPath.find(';')
if i >= 0:
params = totalPath[i:]
totalPath = totalPath[:i]
else:
params = ''
totalPath = totalPath.split('/')
scriptName = '/'.join(totalPath[:numScriptName + num])
pathInfo = '/'.join([''] + totalPath[numScriptName + num:])
# SCRIPT_NAME shouldn't have trailing slash
if scriptName.endswith('/'):
scriptName = scriptName[:-1]
# Transfer to PATH_INFO (most likely empty, but just to be safe...)
pathInfo = '/' + pathInfo
request.environ['SCRIPT_NAME'] = scriptName
request.environ['PATH_INFO'] = pathInfo + params
if __debug__:
assert request.scriptName + request.pathInfo == origTotalPath
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