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Filename : copymove.py
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# -*- test-case-name: txweb2.dav.test.test_copy,twext.web2.dav.test.test_move -*-
##
# Copyright (c) 2005-2017 Apple Inc. All rights reserved.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
#
# DRI: Wilfredo Sanchez, wsanchez@apple.com
##

"""
WebDAV COPY and MOVE methods.
"""

__all__ = ["http_COPY", "http_MOVE"]

from twisted.internet.defer import waitForDeferred, deferredGenerator

from twext.python.log import Logger
from txweb2 import responsecode
from txweb2.dav.fileop import move
from txweb2.http import HTTPError, StatusResponse
from txweb2.filter.location import addLocation
from txdav.xml import element as davxml
from txweb2.dav.idav import IDAVResource
from txweb2.dav.method import put_common
from txweb2.dav.util import parentForURL

# FIXME: This is circular
import txweb2.dav.static

log = Logger()


def http_COPY(self, request):
    """
    Respond to a COPY request. (RFC 2518, section 8.8)
    """
    r = waitForDeferred(prepareForCopy(self, request))
    yield r
    r = r.getResult()

    destination, destination_uri, depth = r

    #
    # Check authentication and access controls
    #
    x = waitForDeferred(self.authorize(request, (davxml.Read(),), recurse=True))
    yield x
    x.getResult()

    if destination.exists():
        x = waitForDeferred(destination.authorize(
            request,
            (davxml.WriteContent(), davxml.WriteProperties()),
            recurse=True
        ))
        yield x
        x.getResult()
    else:
        destparent = waitForDeferred(request.locateResource(parentForURL(destination_uri)))
        yield destparent
        destparent = destparent.getResult()

        x = waitForDeferred(destparent.authorize(request, (davxml.Bind(),)))
        yield x
        x.getResult()

        # May need to add a location header
        addLocation(request, destination_uri)

    # x = waitForDeferred(copy(self.fp, destination.fp, destination_uri, depth))
    x = waitForDeferred(put_common.storeResource(request,
                                                 source=self,
                                                 source_uri=request.uri,
                                                 destination=destination,
                                                 destination_uri=destination_uri,
                                                 deletesource=False,
                                                 depth=depth
                                                 ))
    yield x
    yield x.getResult()

http_COPY = deferredGenerator(http_COPY)


def http_MOVE(self, request):
    """
    Respond to a MOVE request. (RFC 2518, section 8.9)
    """
    r = waitForDeferred(prepareForCopy(self, request))
    yield r
    r = r.getResult()

    destination, destination_uri, depth = r

    #
    # Check authentication and access controls
    #
    parentURL = parentForURL(request.uri)
    parent = waitForDeferred(request.locateResource(parentURL))
    yield parent
    parent = parent.getResult()

    x = waitForDeferred(parent.authorize(request, (davxml.Unbind(),)))
    yield x
    x.getResult()

    if destination.exists():
        x = waitForDeferred(destination.authorize(
            request,
            (davxml.Bind(), davxml.Unbind()),
            recurse=True
        ))
        yield x
        x.getResult()
    else:
        destparentURL = parentForURL(destination_uri)
        destparent = waitForDeferred(request.locateResource(destparentURL))
        yield destparent
        destparent = destparent.getResult()

        x = waitForDeferred(destparent.authorize(request, (davxml.Bind(),)))
        yield x
        x.getResult()

        # May need to add a location header
        addLocation(request, destination_uri)

    #
    # RFC 2518, section 8.9 says that we must act as if the Depth header is set
    # to infinity, and that the client must omit the Depth header or set it to
    # infinity.
    #
    # This seems somewhat at odds with the notion that a bad request should be
    # rejected outright; if the client sends a bad depth header, the client is
    # broken, and section 8 suggests that a bad request should be rejected...
    #
    # Let's play it safe for now and ignore broken clients.
    #
    if self.isCollection() and depth != "infinity":
        msg = "Client sent illegal depth header value for MOVE: %s" % (depth,)
        log.error(msg)
        raise HTTPError(StatusResponse(responsecode.BAD_REQUEST, msg))

    # Lets optimise a move within the same directory to a new resource as a simple move
    # rather than using the full transaction based storeResource api. This allows simple
    # "rename" operations to work quickly.
    if (not destination.exists()) and destparent == parent:
        x = waitForDeferred(move(self.fp, request.uri, destination.fp, destination_uri, depth))
    else:
        x = waitForDeferred(put_common.storeResource(request,
                                                     source=self,
                                                     source_uri=request.uri,
                                                     destination=destination,
                                                     destination_uri=destination_uri,
                                                     deletesource=True,
                                                     depth=depth))
    yield x
    yield x.getResult()

http_MOVE = deferredGenerator(http_MOVE)


def prepareForCopy(self, request):
    #
    # Get the depth
    #

    depth = request.headers.getHeader("depth", "infinity")

    if depth not in ("0", "infinity"):
        msg = ("Client sent illegal depth header value: %s" % (depth,))
        log.error(msg)
        raise HTTPError(StatusResponse(responsecode.BAD_REQUEST, msg))

    #
    # Verify this resource exists
    #

    if not self.exists():
        log.error("File not found: %s" % (self,))
        raise HTTPError(StatusResponse(
            responsecode.NOT_FOUND,
            "Source resource %s not found." % (request.uri,)
        ))

    #
    # Get the destination
    #

    destination_uri = request.headers.getHeader("destination")

    if not destination_uri:
        msg = "No destination header in %s request." % (request.method,)
        log.error(msg)
        raise HTTPError(StatusResponse(responsecode.BAD_REQUEST, msg))

    d = request.locateResource(destination_uri)
    d.addCallback(_prepareForCopy, destination_uri, request, depth)

    return d


def _prepareForCopy(destination, destination_uri, request, depth):
    #
    # Destination must be a DAV resource
    #

    try:
        destination = IDAVResource(destination)
    except TypeError:
        log.error("Attempt to %s to a non-DAV resource: (%s) %s"
                  % (request.method, destination.__class__, destination_uri))
        raise HTTPError(StatusResponse(
            responsecode.FORBIDDEN,
            "Destination %s is not a WebDAV resource." % (destination_uri,)
        ))

    #
    # FIXME: Right now we don't know how to copy to a non-DAVFile resource.
    # We may need some more API in IDAVResource.
    # So far, we need: .exists(), .fp.parent()
    #

    if not isinstance(destination, txweb2.dav.static.DAVFile):
        log.error("DAV copy between non-DAVFile DAV resources isn't implemented")
        raise HTTPError(StatusResponse(
            responsecode.NOT_IMPLEMENTED,
            "Destination %s is not a DAVFile resource." % (destination_uri,)
        ))

    #
    # Check for existing destination resource
    #

    overwrite = request.headers.getHeader("overwrite", True)

    if destination.exists() and not overwrite:
        log.error("Attempt to %s onto existing file without overwrite flag enabled: %s"
                  % (request.method, destination))
        raise HTTPError(StatusResponse(
            responsecode.PRECONDITION_FAILED,
            "Destination %s already exists." % (destination_uri,)
        ))

    #
    # Make sure destination's parent exists
    #

    if not destination.parent().isCollection():
        log.error("Attempt to %s to a resource with no parent: %s"
                  % (request.method, destination.fp.path))
        raise HTTPError(StatusResponse(responsecode.CONFLICT, "No parent collection."))

    return destination, destination_uri, depth