# Copyright 2008-2009 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 _

import mercurial.util

import mercurial.node

import os

class Checker(object):

    '''acl checker.'''

    def __init__(self, ui, repo):

        self.ui = ui

        self.repo = repo

        self.rules = ruleset.rules_from_env()

        self.rules.set(user = os.environ['REMOTE_USER'])

        self.rules.set(repo = os.environ['HG_REPO_PATH'])

    def allow(self, ctx):

        branch = ctx.branch()

        if not self.rules.allow("write", branch=branch, file=None):

            return False

        for f in ctx.files():

            if not self.rules.allow("write", branch=branch, file=f):

                return False

        return True

    def check(self, ctx):

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

        if not self.allow(ctx):

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

                (__name__, mercurial.node.short(ctx.node())))

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

    if hooktype != 'pretxnchangegroup':

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

                           'incoming changesets') % hooktype)

    c = Checker(ui, repo)

    for ctx in changes.changes(repo, node):

        c.check(ctx)