# Copyright 2008 LShift Ltd

# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>

#

# Authors:

# Paul Crowley <paul@lshift.net>

# Vadim Gelfer <vadim.gelfer@gmail.com>

#

# This software may be used and distributed according to the terms

# of the GNU General Public License, incorporated herein by reference.

from mercurial.i18n import _

from mercurial.node import *

from mercurial import util

import os

class Checker(object):

    '''acl checker.'''

    def __init__(self, ui, repo):

        self.ui = ui

        self.repo = repo

        self.repo_path = os.environ['HG_REPO_PATH']

        self.user = os.environ['REMOTE_USER']

    def check(self, node):

        '''return if access allowed, raise exception if not.'''

        files = self.repo.changectx(node).files()

        for f in files:

            if not self.rules.allow("write", user=self.user, repo=self.repo_path, file=f):

                self.ui.debug(_('%s: user %s not allowed on %s\n') %

                              (__name__, self.getuser(), f))

                raise util.Abort(_('%s: access denied for changeset %s') %

                                 (__name__, short(node)))

        self.ui.debug(_('%s: allowing changeset %s\n') % (__name__, short(node)))

def hook(ui, repo, hooktype, node=None, source=None, **kwargs):

    if hooktype != 'pretxnchangegroup':

        raise util.Abort(_('config error - hook type "%s" cannot stop '

                           'incoming changesets') % hooktype)

    c = Checker(ui, repo)

    start = repo.changelog.rev(bin(node))

    end = repo.changelog.count()

    for rev in xrange(start, end):

        c.check(repo.changelog.node(rev))