[z3-checkins] r5667 - z3/Five/branch/dc-experiments

[dreamcatcher at codespeak.net]

Author: dreamcatcher
Date: Sat Jul 24 22:38:16 2004
New Revision: 5667

Added:
   z3/Five/branch/dc-experiments/resource.py   (contents, props changed)
Log:

- Resources! Image, File and PageTemplate. Pending a test for GET/HEAD
  on resources.


Added: z3/Five/branch/dc-experiments/resource.py
==============================================================================
--- (empty file)
+++ z3/Five/branch/dc-experiments/resource.py	Sat Jul 24 22:38:16 2004
@@ -0,0 +1,145 @@
+##############################################################################
+#
+# Copyright (c) 2004 Five Contributors. All rights reserved.
+#
+# This software is distributed under the terms of the Zope Public
+# License (ZPL) v2.1. See COPYING.txt for more information.
+#
+##############################################################################
+"""Provide basic resource functionality
+
+$Id: browser.py 5259 2004-06-23 15:59:52Z philikon $
+"""
+
+from Acquisition import Explicit, aq_inner, aq_parent
+from browser import BrowserView
+from zope.interface import implements
+from zope.component.interfaces import IResource
+from zope.component import getViewProviding
+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
+
+class Resource(Explicit):
+    """A publishable resource
+    """
+
+    implements(IResource)
+
+    def __init__(self, request):
+        self.request = request
+
+    def __call__(self):
+        name = self.__name__
+        if name.startswith('++resource++'):
+            name = name[12:]
+        container = aq_parent(self)
+
+        url = str(getViewProviding(container, IAbsoluteURL, self.request))
+        return "%s/++resource++%s" % (url, name)
+
+
+class PageTemplateResource(BrowserView, Resource):
+
+    #implements(IBrowserPublisher)
+
+    def __browser_default__(self, request):
+        return self, ()
+
+    def __call__(self):
+        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.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.getHeader('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)
+        if resource_factory is not None:
+            self.resource = resource_factory
+
+    def __call__(self, request):
+        resource = self.resource(self.__rsrc, request)
+        resource.__name__ = self.__name
+        return resource
+
+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