def DELETE(self, REQUEST, RESPONSE):
        """Delete a resource. For non-collection resources, DELETE may
        return either 200 or 204 (No Content) to indicate success."""
        self.dav__init(REQUEST, RESPONSE)
        ifhdr = REQUEST.get_header('If', '')
        url = urlfix(REQUEST['URL'], 'DELETE')
        name = unquote(filter(None, url.split( '/')[-1]))
        parent = aq_parent(aq_inner(self))
        # Lock checking
        if wl_isLocked(self):
            if ifhdr:
                self.dav__simpleifhandler(REQUEST, RESPONSE, 'DELETE')
            else:
                # We're locked, and no if header was passed in, so
                # the client doesn't own a lock.
                raise Locked, 'Resource is locked.'
        elif IWriteLock.providedBy(parent) and parent.wl_isLocked():
            if ifhdr:
                parent.dav__simpleifhandler(REQUEST, RESPONSE, 'DELETE', col=1)
            else:
                # Our parent is locked, and no If header was passed in.
                # When a parent is locked, members cannot be removed
                raise PreconditionFailed, 'Resource is locked, and no '\
                      'condition was passed in.'
        # Either we're not locked, or a succesful lock token was submitted
        # so we can delete the lock now.
        # ajung: Fix for Collector # 2196

        if parent.manage_delObjects([name],REQUEST=None)  is None:
            RESPONSE.setStatus(204)
        else:

            RESPONSE.setStatus(403)

        return RESPONSE

    def MKCOL(self, REQUEST, RESPONSE):
        """Create a new collection resource."""
        self.dav__init(REQUEST, RESPONSE)
        if REQUEST.get('BODY', ''):
            raise UnsupportedMediaType, 'Unknown request body.'

        name=self.__name__
        parent = self.__parent__

        if hasattr(aq_base(parent), name):
            raise MethodNotAllowed, 'The name %s is in use.' % name
        if not isDavCollection(parent):
            raise Forbidden, 'Cannot create collection at this location.'

        ifhdr = REQUEST.get_header('If', '')
        if IWriteLock.providedBy(parent) and parent.wl_isLocked():
            if ifhdr:
                parent.dav__simpleifhandler(REQUEST, RESPONSE, col=1)
            else:
                raise Locked
        elif ifhdr:
            # There was an If header, but the parent is not locked
            raise PreconditionFailed

        # Add hook for webdav/FTP MKCOL (Collector #2254) (needed for CMF)
#       parent.manage_addFolder(name)
        mkcol_handler = getattr(parent,'MKCOL_handler' ,parent.manage_addFolder)
        mkcol_handler(name)

        RESPONSE.setStatus(201)
        RESPONSE.setBody('')
        return RESPONSE

def webdav_enabled(obj, container):
    """WebDAV check used in externalEditorEnabled.py"""

    # Object implements lock interface
    if IWriteLock.providedBy(obj):
        return True

    return False

 def dav__supportedlock(self):
     vself = self.v_self()
     out = '\n'
     if IWriteLock.providedBy(vself):
         out += ('  <n:lockentry>\n'
                 '  <d:lockscope><d:exclusive/></d:lockscope>\n'
                 '  <d:locktype><d:write/></d:locktype>\n'
                 '  </n:lockentry>\n  ')
     return out

    def apply(self, obj, token, sm, url=None, result=None, top=1):
        if result is None:
            result = StringIO()
            url = urlfix(url, 'DELETE')
            url = urlbase(url)
        iscol = isDavCollection(obj)
        errmsg = None
        parent = aq_parent(obj)

        islockable = IWriteLock.providedBy(obj)
        if parent and (not sm.checkPermission(delete_objects, parent)):
            # User doesn't have permission to delete this object
            errmsg = "403 Forbidden"
        elif islockable and obj.wl_isLocked():
            if token and obj.wl_hasLock(token):
                # Object is locked, and the token matches (no error)
                errmsg = ""
            else:
                errmsg = "423 Locked"

        if errmsg:
            if top and (not iscol):
                if errmsg == "403 Forbidden":
                    raise Forbidden()
                if errmsg == "423 Locked":
                    raise Locked()
            elif not result.getvalue():
                # We haven't had any errors yet, so our result is empty
                # and we need to set up the XML header
                result.write('<?xml version="1.0" encoding="utf-8" ?>\n' \
                             '<d:multistatus xmlns:d="DAV:">\n')
            result.write('<d:response>\n <d:href>%s</d:href>\n' % url)
            result.write(' <d:status>HTTP/1.1 %s</d:status>\n' % errmsg)
            result.write('</d:response>\n')

        if iscol:
            for ob in obj.objectValues():
                dflag = hasattr(ob,'_p_changed') and (ob._p_changed == None)
                if hasattr(ob, '__dav_resource__'):
                    uri = urljoin(url, absattr(ob.getId()))
                    self.apply(ob, token, sm, uri, result, top=0)
                    if dflag:
                        ob._p_deactivate()
        if not top:
            return result
        if result.getvalue():
            # One or more subitems can't be delted, so close the multistatus
            # element
            result.write('</d:multistatus>\n')
        return result.getvalue()

    def LOCK(self, REQUEST, RESPONSE):
        """ LOCK on a Null Resource makes a LockNullResource instance """
        self.dav__init(REQUEST, RESPONSE)
        security = getSecurityManager()
        creator = security.getUser()
        body = REQUEST.get('BODY', '')
        ifhdr = REQUEST.get_header('If', '')
        depth = REQUEST.get_header('Depth', 'infinity')

        name = self.__name__
        parent = self.__parent__

        if IWriteLock.providedBy(parent) and parent.wl_isLocked():
            if ifhdr:
                parent.dav__simpleifhandler(REQUEST, RESPONSE, col=1)
            else:
                raise Locked
        elif ifhdr:
            # There was an If header, but the parent is not locked.
            raise PreconditionFailed

        # The logic involved in locking a null resource is simpler than
        # a regular resource, since we know we're not already locked,
        # and the lock isn't being refreshed.
        if not body:
            raise BadRequest, 'No body was in the request'

        locknull = LockNullResource(name)
        parent._setObject(name, locknull)
        locknull = parent._getOb(name)

        cmd = Lock(REQUEST)
        token, result = cmd.apply(locknull, creator, depth=depth)
        if result:
            # Return the multistatus result (there were multiple errors)
            # This *shouldn't* happen for locking a NullResource, but it's
            # inexpensive to handle and is good coverage for any future
            # changes in davcmds.Lock
            RESPONSE.setStatus(207)
            RESPONSE.setHeader('Content-Type', 'text/xml; charset="utf-8"')
            RESPONSE.setBody(result)
        else:
            # The command was succesful
            lock = locknull.wl_getLock(token)
            RESPONSE.setStatus(200)
            RESPONSE.setHeader('Content-Type', 'text/xml; charset="utf-8"')
            RESPONSE.setHeader('Lock-Token', 'opaquelocktoken:' + token)
            RESPONSE.setBody(lock.asXML())

    def dav__lockdiscovery(self):
        security = getSecurityManager()
        user = security.getUser().getId()

        vself = self.v_self()
        out = '\n'
        if IWriteLock.providedBy(vself):
            locks = vself.wl_lockValues(killinvalids=1)
            for lock in locks:

                creator = lock.getCreator()[-1]
                if creator == user: fake=0
                else:               fake=1

                out = '%s\n%s' % (out, lock.asLockDiscoveryProperty('n',fake=fake))

            out = '%s\n' % out

        return out

    def wl_clearLocks(self):
        # Called by lock management machinery to quickly and effectively
        # destroy all locks.
        try:
            locks = self.wl_lockmapping()
            locks.clear()
        except:
            # The locks may be totally messed up, so we'll just delete
            # and replace.
            if hasattr(self, '_dav_writelocks'):
                del self._dav_writelocks
            if IWriteLock.providedBy(self):
                self._dav_writelocks = PersistentMapping()

        # Call into a special hook used by LockNullResources to delete
        # themselves.  Could be used by other objects who want to deal
        # with the state of empty locks.
        if hasattr(aq_base(self), '__no_valid_write_locks__'):
            self.__no_valid_write_locks__()

def PUT(self, REQUEST, RESPONSE):
        """Create a new non-collection resource.
        """
        if getattr(self.__parent__, 'PUT_factory', None) is not None: # BBB
          return NullResource_PUT(self, REQUEST, RESPONSE)

        self.dav__init(REQUEST, RESPONSE)
        if REQUEST.environ['REQUEST_METHOD'] != 'PUT':
          raise Forbidden, 'REQUEST_METHOD should be PUT.'

        name = self.__name__
        parent = self.__parent__

        ifhdr = REQUEST.get_header('If', '')
        if IWriteLock.providedBy(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

        # <ERP5>
        # XXX: Do we really want to force 'id'
        #      when PUT is called on Contribution Tool ?
        kw = {'id': name, 'data': None, 'filename': name}
        contribution_tool = parent.getPortalObject().portal_contributions
        if aq_base(contribution_tool) is not aq_base(parent):
          kw.update(container=parent, discover_metadata=False)
        ob = contribution_tool.newContent(**kw)
        # </ERP5>

        ob.PUT(REQUEST, RESPONSE)
        RESPONSE.setStatus(201)
        RESPONSE.setBody('')
        return RESPONSE

    def MOVE(self, REQUEST, RESPONSE):
        """Move a resource to a new location. Though we may later try to
        make a move appear seamless across namespaces (e.g. from Zope
        to Apache), MOVE is currently only supported within the Zope
        namespace."""
        self.dav__init(REQUEST, RESPONSE)
        self.dav__validate(self, 'DELETE', REQUEST)
        if not hasattr(aq_base(self), 'cb_isMoveable') or \
           not self.cb_isMoveable():
            raise MethodNotAllowed, 'This object may not be moved.'

        dest=REQUEST.get_header('Destination', '')

        try: path = REQUEST.physicalPathFromURL(dest)
        except ValueError:
            raise BadRequest, 'No destination given'

        flag=REQUEST.get_header('Overwrite', 'F')
        flag=flag.upper()

        name = path.pop()
        parent_path = '/'.join(path)

        try: parent = self.restrictedTraverse(path)
        except ValueError:
            raise Conflict, 'Attempt to move to an unknown namespace.'
        except 'Not Found':
            raise Conflict, 'The resource %s must exist.' % parent_path
        except:
            raise
        if hasattr(parent, '__null_resource__'):
            raise Conflict, 'The resource %s must exist.' % parent_path
        existing=hasattr(aq_base(parent), name)
        if existing and flag=='F':
            raise PreconditionFailed, 'Resource %s exists.' % dest
        try:
            parent._checkId(name, allow_dup=1)
        except:
            raise Forbidden, sys.exc_info()[1]
        try:
            parent._verifyObjectPaste(self)
        except Unauthorized:
            raise
        except:
            raise Forbidden, sys.exc_info()[1]

        # Now check locks.  Since we're affecting the resource that we're
        # moving as well as the destination, we have to check both.
        ifhdr = REQUEST.get_header('If', '')
        if existing:
            # The destination itself exists, so we need to check its locks
            destob = aq_base(parent)._getOb(name)
            if IWriteLock.providedBy(destob) and destob.wl_isLocked():
                if ifhdr:
                    itrue = destob.dav__simpleifhandler(
                        REQUEST, RESPONSE, 'MOVE', url=dest, refresh=1)
                    if not itrue:
                        raise PreconditionFailed
                else:
                    raise Locked, 'Destination is locked.'
        elif IWriteLock.providedBy(parent) and parent.wl_isLocked():
            # There's no existing object in the destination folder, so
            # we need to check the folders locks since we're changing its
            # member list
            if ifhdr:
                itrue = parent.dav__simpleifhandler(REQUEST, RESPONSE, 'MOVE',
                                                    col=1, url=dest, refresh=1)
                if not itrue:
                    raise PreconditionFailed, 'Condition failed.'
            else:
                raise Locked, 'Destination is locked.'
        if wl_isLocked(self):
            # Lastly, we check ourselves
            if ifhdr:
                itrue = self.dav__simpleifhandler(REQUEST, RESPONSE, 'MOVE',
                                                  refresh=1)
                if not itrue:
                    raise PreconditionFailed, 'Condition failed.'
            else:
                raise Locked('Source is locked and no condition was passed in')

        orig_container = aq_parent(aq_inner(self))
        orig_id = self.getId()

        self._notifyOfCopyTo(parent, op=1)

        notify(ObjectWillBeMovedEvent(self, orig_container, orig_id,
                                      parent, name))

        # try to make ownership explicit so that it gets carried
        # along to the new location if needed.
        self.manage_changeOwnershipType(explicit=1)

        ob = self._getCopy(parent)
        ob._setId(name)

        orig_container._delObject(orig_id, suppress_events=True)

        if existing:
            object=getattr(parent, name)
#.........这里部分代码省略.........

    def COPY(self, REQUEST, RESPONSE):
        """Create a duplicate of the source resource whose state
        and behavior match that of the source resource as closely
        as possible. Though we may later try to make a copy appear
        seamless across namespaces (e.g. from Zope to Apache), COPY
        is currently only supported within the Zope namespace."""
        self.dav__init(REQUEST, RESPONSE)
        if not hasattr(aq_base(self), 'cb_isCopyable') or \
           not self.cb_isCopyable():
            raise MethodNotAllowed, 'This object may not be copied.'

        depth=REQUEST.get_header('Depth', 'infinity')
        if not depth in ('0', 'infinity'):
            raise BadRequest, 'Invalid Depth header.'

        dest=REQUEST.get_header('Destination', '')
        while dest and dest[-1]=='/':
            dest=dest[:-1]
        if not dest:
            raise BadRequest, 'Invalid Destination header.'

        try: path = REQUEST.physicalPathFromURL(dest)
        except ValueError:
            raise BadRequest, 'Invalid Destination header'

        name = path.pop()

        oflag=REQUEST.get_header('Overwrite', 'F').upper()
        if not oflag in ('T', 'F'):
            raise BadRequest, 'Invalid Overwrite header.'

        try: parent=self.restrictedTraverse(path)
        except ValueError:
            raise Conflict, 'Attempt to copy to an unknown namespace.'
        except NotFound:
            raise Conflict, 'Object ancestors must already exist.'
        except:
            t, v, tb=sys.exc_info()
            raise t, v
        if hasattr(parent, '__null_resource__'):
            raise Conflict, 'Object ancestors must already exist.'
        existing=hasattr(aq_base(parent), name)
        if existing and oflag=='F':
            raise PreconditionFailed, 'Destination resource exists.'
        try:
            parent._checkId(name, allow_dup=1)
        except:
            raise Forbidden, sys.exc_info()[1]
        try:
            parent._verifyObjectPaste(self)
        except Unauthorized:
            raise
        except:
            raise Forbidden, sys.exc_info()[1]

        # Now check locks.  The If header on a copy only cares about the
        # lock on the destination, so we need to check out the destinations
        # lock status.
        ifhdr = REQUEST.get_header('If', '')
        if existing:
            # The destination itself exists, so we need to check its locks
            destob = aq_base(parent)._getOb(name)
            if IWriteLock.providedBy(destob) and destob.wl_isLocked():
                if ifhdr:
                    itrue = destob.dav__simpleifhandler(
                        REQUEST, RESPONSE, 'COPY', refresh=1)
                    if not itrue:
                        raise PreconditonFailed
                else:
                    raise Locked, 'Destination is locked.'
        elif IWriteLock.providedBy(parent) and parent.wl_isLocked():
            if ifhdr:
                parent.dav__simpleifhandler(REQUEST, RESPONSE, 'COPY',
                                            refresh=1)
            else:
                raise Locked, 'Destination is locked.'

        self._notifyOfCopyTo(parent, op=0)
        ob = self._getCopy(parent)
        ob._setId(name)

        if depth=='0' and isDavCollection(ob):
            for id in ob.objectIds():
                ob._delObject(id)

        notify(ObjectCopiedEvent(ob, self))

        if existing:
            object=getattr(parent, name)
            self.dav__validate(object, 'DELETE', REQUEST)
            parent._delObject(name)

        parent._setObject(name, ob)
        ob = parent._getOb(name)
        ob._postCopy(parent, op=0)

        compatibilityCall('manage_afterClone', ob, ob)

        notify(ObjectClonedEvent(ob))

#.........这里部分代码省略.........

    def MOVE(self, REQUEST, RESPONSE):
        """Move a resource to a new location within the reflector"""
        self.dav__init(REQUEST, RESPONSE)
        self.dav__validate(self, 'DELETE', REQUEST)
        if not hasattr(aq_base(self), 'cb_isMoveable') or \
           not self.cb_isMoveable():
            raise MethodNotAllowed, 'This object may not be moved.'

        dest=REQUEST.get_header('Destination', '')

        try: path = REQUEST.physicalPathFromURL(dest)
        except ValueError:
            raise BadRequest, 'No destination given'

        flag=REQUEST.get_header('Overwrite', 'F')
        flag=flag.upper()

        name = path.pop()
        parent_path = '/'.join(path)

        try: parent = self.restrictedTraverse(path)
        except ValueError:
            raise Conflict, 'Attempt to move to an unknown namespace.'
        except 'Not Found':
            raise Conflict, 'The resource %s must exist.' % parent_path
        except:
            t, v, tb=sys.exc_info()
            raise t, v
        if hasattr(parent, '__null_resource__'):
            raise Conflict, 'The resource %s must exist.' % parent_path
        existing=hasattr(aq_base(parent), name)
        if existing and flag=='F':
            raise PreconditionFailed, 'Resource %s exists.' % dest
        try:
            parent._checkId(name, allow_dup=1)
        except:
            raise Forbidden, sys.exc_info()[1]
        try:
            parent._verifyObjectPaste(self)
        except Unauthorized:
            raise
        except:
            raise Forbidden, sys.exc_info()[1]

        # Now check locks.  Since we're affecting the resource that we're
        # moving as well as the destination, we have to check both.
        ifhdr = REQUEST.get_header('If', '')
        if existing:
            # The destination itself exists, so we need to check its locks
            destob = aq_base(parent)._getOb(name)
            if IWriteLock.providedBy(destob) and destob.wl_isLocked():
                if ifhdr:
                    itrue = destob.dav__simpleifhandler(
                        REQUEST, RESPONSE, 'MOVE', url=dest, refresh=1)
                    if not itrue:
                        raise PreconditionFailed
                else:
                    raise Locked, 'Destination is locked.'
        elif IWriteLock.providedBy(parent) and parent.wl_isLocked():
            # There's no existing object in the destination folder, so
            # we need to check the folders locks since we're changing its
            # member list
            if ifhdr:
                itrue = parent.dav__simpleifhandler(REQUEST, RESPONSE, 'MOVE',
                                                    col=1, url=dest, refresh=1)
                if not itrue:
                    raise PreconditionFailed, 'Condition failed.'
            else:
                raise Locked, 'Destination is locked.'
        if Lockable.wl_isLocked(self):
            # Lastly, we check ourselves
            if ifhdr:
                itrue = self.dav__simpleifhandler(REQUEST, RESPONSE, 'MOVE',
                                                  refresh=1)
                if not itrue:
                    raise PreconditionFailed, 'Condition failed.'
            else:
                raise PreconditionFailed, 'Source is locked and no '\
                      'condition was passed in.'

        orig_container = aq_parent(aq_inner(self))
        orig_id = self.getId()

        self._notifyOfCopyTo(parent, op=1)

        #### This part is reflecto specific
        notify(ObjectWillBeMovedEvent(self, orig_container, orig_id,
                                      parent, name))
        self.unindexObject()
        if existing:
            object=parent[name]
            self.dav__validate(object, 'DELETE', REQUEST)
            parent.manage_delObjects([name])
            
        os.rename(self.getFilesystemPath(), os.path.join(parent.getFilesystemPath(), name))
        ob = parent[name]
        ob.indexObject()
        ####
        
        notify(ObjectMovedEvent(ob, orig_container, orig_id, parent, name))
#.........这里部分代码省略.........

    def COPY(self, REQUEST, RESPONSE):
        """Create a duplicate of the source resource. This is only allowed
        within the same reflecto directory."""
        self.dav__init(REQUEST, RESPONSE)
        if not hasattr(aq_base(self), 'cb_isCopyable') or \
           not self.cb_isCopyable():
            raise MethodNotAllowed, 'This object may not be copied.'

        depth=REQUEST.get_header('Depth', 'infinity')
        if not depth in ('0', 'infinity'):
            raise BadRequest, 'Invalid Depth header.'

        dest=REQUEST.get_header('Destination', '')
        while dest and dest[-1]=='/':
            dest=dest[:-1]
        if not dest:
            raise BadRequest, 'Invalid Destination header.'

        try: path = REQUEST.physicalPathFromURL(dest)
        except ValueError:
            raise BadRequest, 'Invalid Destination header'

        name = path.pop()

        oflag=REQUEST.get_header('Overwrite', 'F').upper()
        if not oflag in ('T', 'F'):
            raise BadRequest, 'Invalid Overwrite header.'

        try: parent=self.restrictedTraverse(path)
        except ValueError:
            raise Conflict, 'Attempt to copy to an unknown namespace.'
        except NotFound:
            raise Conflict, 'Object ancestors must already exist.'
        except:
            t, v, tb=sys.exc_info()
            raise t, v
        if hasattr(parent, '__null_resource__'):
            raise Conflict, 'Object ancestors must already exist.'
        existing=hasattr(aq_base(parent), name)
        if existing and oflag=='F':
            raise PreconditionFailed, 'Destination resource exists.'
        try:
            parent._checkId(name, allow_dup=1)
        except:
            raise Forbidden, sys.exc_info()[1]
        try:
            parent._verifyObjectPaste(self)
        except Unauthorized:
            raise
        except:
            raise Forbidden, sys.exc_info()[1]

        # Now check locks.  The If header on a copy only cares about the
        # lock on the destination, so we need to check out the destinations
        # lock status.
        ifhdr = REQUEST.get_header('If', '')
        if existing:
            # The destination itself exists, so we need to check its locks
            destob = aq_base(parent)._getOb(name)
            if IWriteLock.providedBy(destob) and destob.wl_isLocked():
                if ifhdr:
                    itrue = destob.dav__simpleifhandler(
                        REQUEST, RESPONSE, 'COPY', refresh=1)
                    if not itrue:
                        raise PreconditionFailed
                else:
                    raise Locked, 'Destination is locked.'
        elif IWriteLock.providedBy(parent) and parent.wl_isLocked():
            if ifhdr:
                parent.dav__simpleifhandler(REQUEST, RESPONSE, 'COPY',
                                            refresh=1)
            else:
                raise Locked, 'Destination is locked.'

        self._notifyOfCopyTo(parent, op=0)
        
        #### This part is reflecto specific
        if existing:
            object=getattr(parent, name)
            self.dav__validate(object, 'DELETE', REQUEST)
            parent.manage_delObjects([name])
        
        oldpath = self.getFilesystemPath()
        newpath = os.path.join(parent.getFilesystemPath(), name)
        
        if IReflectoDirectory.providedBy(self):
            if depth=='0':
                os.mkdir(newpath, 0775)
            else:
                shutil.copytree(oldpath, newpath)
        else:
            shutil.copy2(oldpath, newpath)
        ob = parent[name]
        ob.indexObject()
        notify(ObjectCopiedEvent(ob, self))
        notify(ObjectClonedEvent(ob))
        notifyContainerModified(parent)
        ####

        # We remove any locks from the copied object because webdav clients
#.........这里部分代码省略.........

    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 IWriteLock.providedBy(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=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:
             sMsg = 'Unable to create object of class %s in %s: %s' % \
                    (ob.__class__, repr(parent), sys.exc_info()[1],)
             raise Unauthorized, sMsg

        # 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

def wl_isLockable(ob):
    return IWriteLock.providedBy(ob)