[Zope] Workflow question

[David Pratt]

Hi Dieter.  I think I understand.  What I have done so far is to make a 
upload folder product.  I have taken the portal folder base class to 
create a portal upload folder base class, commented out the PUT_factory 
method and added the following methods for bobo traverse and PUT. I am 
then subclassing this to create upload folder types that will be 
available to portal.

I commented out the portion of the PUT's method that creates the object 
so it should proceed to the response without making the object. I have 
yet to test any of this out but this is what I have got so far.  Does 
this look sensible?
	
	# Catch put in traversal
	def __bobo_traverse__(self, REQUEST):
		method=REQUEST.get('REQUEST_METHOD', 'GET')
		if method == 'PUT':
			PUT(REQUEST, RESPONSE)

	# Using default put method from NullResource
	def _default_PUT_factory( self, name, typ, body ):
		# Return DTMLDoc/PageTemplate/Image/File, based on sniffing.
		if name and name.endswith('.pt'):
			from Products.PageTemplates.ZopePageTemplate import ZopePageTemplate
			ob = ZopePageTemplate(name, body, content_type=typ)
		elif typ in ('text/html', 'text/xml', 'text/plain'):
			from OFS.DTMLDocument import DTMLDocument
			ob = DTMLDocument( '', __name__=name )
		elif typ[:6]=='image/':
			from OFS.Image import Image
			ob=Image(name, '', body, content_type=typ)
		else:
			from OFS.Image import File
			ob=File(name, '', body, content_type=typ)
		return ob
	
	# Modified PUT from NullResource	
	PUT__roles__ = ('Anonymous',)
	def PUT(self, REQUEST, RESPONSE):
		"""Create a new non-collection resource.
		"""
		from ZServer import LARGE_FILE_THRESHOLD
		
		self.dav__init(REQUEST, RESPONSE)
		
		name = self.__name__
		parent = self.__parent__
		
		ifhdr = REQUEST.get_header('If', '')
		if WriteLockInterface.isImplementedBy(parent) and 
parent.wl_isLocked():
			if ifhdr:
				parent.dav__simpleifhandler(REQUEST, RESPONSE, col=1)
			else:
				# There was no If header at all, and our parent is locked,
				# so we fail here
				raise Locked
		elif ifhdr:
			# There was an If header, but the parent is not locked
			raise PreconditionFailed
	
		# SDS: Only use BODY if the file size is smaller than
		# LARGE_FILE_THRESHOLD, otherwise read LARGE_FILE_THRESHOLD
		# bytes from the file which should be enough to trigger
		# content_type detection, and possibly enough for CMF's
		# content_type_registry too.
		#
		# Note that body here is really just used for detecting the
		# content type and figuring out the correct factory. The correct
		# file content will be uploaded on ob.PUT(REQUEST, RESPONSE) after
		# the object has been created.
		#
		# A problem I could see is content_type_registry predicates
		# that do depend on the whole file being passed here as an
		# argument. There's none by default that does this though. If
		# they really do want to look at the file, they should use
		# REQUEST['BODYFILE'] directly and try as much as possible not
		# to read the whole file into memory.
		
		if int(REQUEST.get('CONTENT_LENGTH') or 0) > LARGE_FILE_THRESHOLD:
			file = REQUEST['BODYFILE']
			body = file.read(LARGE_FILE_THRESHOLD)
			file.seek(0)
		else:
			body = REQUEST.get('BODY', '')
		
		typ=REQUEST.get_header('content-type', None)
		if typ is None:
			typ, enc=OFS.content_types.guess_content_type(name, body)
	
		factory = getattr(parent, 'PUT_factory', self._default_PUT_factory )
		ob = factory(name, typ, body)
		if ob is None:
			ob = self._default_PUT_factory(name, typ, body)
		
		# We call _verifyObjectPaste with verify_src=0, to see if the
		# user can create this type of object (and we don't need to
		# check the clipboard.
		try:
			parent._verifyObjectPaste(ob.__of__(parent), 0)
		except CopyError:
			raise Unauthorized, sys.exc_info()[1]
		
		# We don' want an object  - so object creation below commented out

		# Delegate actual PUT handling to the new object,
		# SDS: But just *after* it has been stored.
		# self.__parent__._setObject(name, ob)
		# ob = self.__parent__._getOb(name)
		# ob.PUT(REQUEST, RESPONSE)
		
		RESPONSE.setStatus(201)
		RESPONSE.setBody('')
		return RESPONSE

On Sunday, August 21, 2005, at 05:58 PM, Dieter Maurer wrote:

> David Pratt wrote at 2005-8-19 15:38 -0300:
>> First step is to make new type - will
>> do this today but might need to ask a question or two when I get to
>> bobo traverse portion. When you say another auxillary object, what 
>> kind
>> of object is this so I understand a bit better?
>
> One similar to "webdav.Resource.NullResource" (and probably deriving
> from it) but with a PUT method that does what you want.
>
> -- 
> Dieter
>