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"""WebDAV support - collection objects."""

__version__='$Revision: 1.17 $'[11:-2]

import sys, os, string, Globals
from common import urlfix, rfc1123_date
from Resource import Resource
from urllib import unquote


class Collection(Resource):
    """The Collection class provides basic WebDAV support for
    collection objects. It provides default implementations 
    for all supported WebDAV HTTP methods. The behaviors of some
    WebDAV HTTP methods for collections are slightly different
    than those for non-collection resources."""

    __dav_collection__=1

    def dav__init(self, request, response):
        # We are allowed to accept a url w/o a trailing slash
        # for a collection, but are supposed to provide a
        # hint to the client that it should be using one.
        # [WebDAV, 5.2]
        pathinfo=request.get('PATH_INFO','')
        if pathinfo and pathinfo[-1] != '/':
            location='%s/' % request['URL1']
            response.setHeader('Content-Location', location)
        response.setHeader('Connection', 'close', 1)
        response.setHeader('Date', rfc1123_date(), 1)
        response.setHeader('MS-Author-Via', 'DAV')

    def HEAD(self, REQUEST, RESPONSE):
        """Retrieve resource information without a response body."""
        self.dav__init(REQUEST, RESPONSE)
        # Note that we are willing to acquire the default document
        # here because what we really care about is whether doing
        # a GET on this collection / would yield a 200 response.
        if hasattr(self, 'index_html'):
            if hasattr(self.index_html, 'HEAD'):
                return self.index_html.HEAD(REQUEST, RESPONSE)
            raise 'Method Not Allowed', (
                  'Method not supported for this resource.'
                  )
        raise 'Not Found', 'The requested resource does not exist.'

    def PUT(self, REQUEST, RESPONSE):
        """The PUT method has no inherent meaning for collection
        resources, though collections are not specifically forbidden
        to handle PUT requests. The default response to a PUT request
        for collections is 405 (Method Not Allowed)."""
        self.dav__init(REQUEST, RESPONSE)
        raise 'Method Not Allowed', 'Method not supported for collections.'

    def DELETE(self, REQUEST, RESPONSE):
        """Delete a collection resource. For collection resources, DELETE
        may return either 200 (OK) or 204 (No Content) to indicate total
        success, or may return 207 (Multistatus) to indicate partial
        success. Note that in Zope a DELETE currently never returns 207."""
        self.dav__init(REQUEST, RESPONSE)
        url=urlfix(REQUEST['URL'], 'DELETE')
        name=unquote(filter(None, string.split(url, '/'))[-1])
        # TODO: add lock checking here
        self.aq_parent._delObject(name)
        RESPONSE.setStatus(204)
        return RESPONSE


Globals.default__class_init__(Collection)
