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##############################################################################
#
# Copyright (c) 2004, 2005 Zope Corporation 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.
#
##############################################################################
"""Provide basic resource functionality
$Id: browser.py 5259 2004-06-23 15:59:52Z philikon $
"""
import os
import urllib
from Acquisition import Explicit, aq_inner, aq_parent
from ComputedAttribute import ComputedAttribute
from browser import BrowserView
from OFS.Traversable import Traversable as OFSTraversable
from zope.exceptions import NotFoundError
from zope.interface import implements
from zope.component.interfaces import IResource
from zope.component import getViewProviding
from zope.publisher.interfaces.browser import IBrowserPublisher
from zope.app.traversing.browser.interfaces import IAbsoluteURL
from zope.app.datetimeutils import time as timeFromDateTimeString
from zope.app.publisher.fileresource import File, Image
from zope.app.publisher.pagetemplateresource import PageTemplate
from zope.app.publisher.browser.resources import empty
_marker = []
class Resource(Explicit):
"""A publishable resource
"""
implements(IResource)
def __init__(self, request):
self.request = request
def __call__(self):
name = self.__name__
container = self.__parent__
url = str(getViewProviding(container, IAbsoluteURL, self.request))
url = urllib.unquote(url)
if not isinstance(container, DirectoryResource):
name = '++resource++%s' % name
return "%s/%s" % (url, name)
class PageTemplateResource(BrowserView, Resource):
#implements(IBrowserPublisher)
def __browser_default__(self, request):
return self, ('render', )
def render(self):
"""Rendered content"""
pt = self.context
return pt(self.request)
class FileResource(BrowserView, Resource):
"""A publishable file-based resource"""
#implements(IBrowserPublisher)
def __browser_default__(self, request):
return self, (request.REQUEST_METHOD,)
def GET(self):
"""Default content"""
file = self.context
request = self.request
response = request.response
# HTTP If-Modified-Since header handling. This is duplicated
# from OFS.Image.Image - it really should be consolidated
# somewhere...
header = request.environ.get('If-Modified-Since', None)
if header is not None:
header = header.split(';')[0]
# Some proxies seem to send invalid date strings for this
# header. If the date string is not valid, we ignore it
# rather than raise an error to be generally consistent
# with common servers such as Apache (which can usually
# understand the screwy date string as a lucky side effect
# of the way they parse it).
try: mod_since=long(timeFromDateTimeString(header))
except: mod_since=None
if mod_since is not None:
if getattr(file, 'lmt', None):
last_mod = long(file.lmt)
else:
last_mod = long(0)
if last_mod > 0 and last_mod <= mod_since:
response.setStatus(304)
return ''
response.setHeader('Content-Type', file.content_type)
response.setHeader('Last-Modified', file.lmh)
# Cache for one day
response.setHeader('Cache-Control', 'public,max-age=86400')
f = open(file.path, 'rb')
data = f.read()
f.close()
return data
def HEAD(self):
file = self.context
response = self.request.response
response = self.request.response
response.setHeader('Content-Type', file.content_type)
response.setHeader('Last-Modified', file.lmh)
# Cache for one day
response.setHeader('Cache-Control', 'public,max-age=86400')
return ''
class ResourceFactory:
factory = None
resource = None
def __init__(self, name, path, resource_factory=None):
self.__name = name
self.__rsrc = self.factory(path, name)
if resource_factory is not None:
self.resource = resource_factory
def __call__(self, request):
resource = self.resource(self.__rsrc, request)
return resource
def _PageTemplate(self, path, name):
# PageTemplate doesn't take a name parameter,
# which makes it different from FileResource.
# This is probably an error.
template = PageTemplate(path)
template.__name__ = name
return template
class PageTemplateResourceFactory(ResourceFactory):
"""A factory for Page Template resources"""
factory = _PageTemplate
resource = PageTemplateResource
class FileResourceFactory(ResourceFactory):
"""A factory for File resources"""
factory = File
resource = FileResource
class ImageResourceFactory(ResourceFactory):
"""A factory for Image resources"""
factory = Image
resource = FileResource
# we only need this class a context for DirectoryResource
class Directory:
def __init__(self, path, name):
self.path = path
self.__name__ = name
class DirectoryResource(BrowserView, Resource, OFSTraversable):
#implements(IBrowserPublisher)
resource_factories = {
'gif': ImageResourceFactory,
'png': ImageResourceFactory,
'jpg': ImageResourceFactory,
'pt': PageTemplateResourceFactory,
'zpt': PageTemplateResourceFactory,
'html': PageTemplateResourceFactory,
}
default_factory = FileResourceFactory
def __init__(self, context, request):
BrowserView.__init__(self, context, request)
# OFSTraversable.absolute_url() assumes self.REQUEST being
# accessible:
self.REQUEST = request
def getId(self):
name = self.__name__
if not name.startswith('++resource++'):
name = '++resource++%s' % self.__name__
return name
def __browser_default__(self, request):
'''See interface IBrowserPublisher'''
return empty, ()
def __getitem__(self, name):
res = self.get(name, None)
if res is None:
raise KeyError, name
return res
def get(self, name, default=_marker):
path = self.context.path
filename = os.path.join(path, name)
if not os.path.isfile(filename):
if default is _marker:
raise NotFoundError(name)
return default
ext = name.split('.')[-1]
factory = self.resource_factories.get(ext, self.default_factory)
resource = factory(name, filename)(self.request)
resource.__name__ = name
resource.__parent__ = self
# XXX __of__ wrapping is usually done on traversal.
# However, we don't want to subclass Traversable (or do we?)
# The right thing should probably be a specific (and very simple)
# traverser that does __getitem__ and __of__.
return resource.__of__(self)
class DirectoryResourceFactory(ResourceFactory):
factory = Directory
resource = DirectoryResource