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# Authors:
#   Rob Crittenden <rcritten@redhat.com>
#
# Copyright (C) 2008  Red Hat
# see file 'COPYING' for use and warranty information
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; version 2 only
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA

import shlex
import re
import ldap

# The Python re module doesn't do nested parenthesis

# Break the ACI into 3 pieces: target, name, permissions/bind_rules
ACIPat = re.compile(r'\s*(\(.*\)+)\s*\(version\s+3.0\s*;\s*acl\s+\"(.*)\"\s*;\s*(.*);\)')

# Break the permissions/bind_rules out
PermPat = re.compile(r'(\w+)\s*\((.*)\)\s+(.*)')


class ACI:
    """
    Holds the basic data for an ACI entry, as stored in the cn=accounts
    entry in LDAP.  Has methods to parse an ACI string and export to an
    ACI String.
    """

    # Don't allow arbitrary attributes to be set in our __setattr__ implementation.
    _objectattrs = ["name", "orig_acistr", "target", "action", "permissions",
                   "bindrule"]

    __actions = ["allow", "deny"]

    __permissions = ["read", "write", "add", "delete", "search", "compare",
                   "selfwrite", "proxy", "all"]

    def __init__(self,acistr=None):
        self.name = None
        self.orig_acistr = acistr
        self.target = {}
        self.action = "allow"
        self.permissions = ["write"]
        self.bindrule = None
        if acistr is not None:
            self._parse_acistr(acistr)

    def __getitem__(self,key):
        """Fake getting attributes by key for sorting"""
        if key == 0:
            return self.name
        if key == 1:
            return self.source_group
        if key == 2:
            return self.dest_group
        raise TypeError("Unknown key value %s" % key)

    def __repr__(self):
        """An alias for export_to_string()"""
        return self.export_to_string()

    def __getattr__(self, name):
        """
        Backward compatibility for the old ACI class.

        The following extra attributes are available:

            - source_group
            - dest_group
            - attrs
        """
        if name == 'source_group':
            group = ''
            dn = self.bindrule.split('=',1)
            if dn[0] == "groupdn":
                group = self._remove_quotes(dn[1])
                if group.startswith("ldap:///"):
                    group = group[8:]
            return group
        if name == 'dest_group':
            group = self.target.get('targetfilter', '')
            if group:
                g = group.split('=',1)[1]
                if g.endswith(')'):
                    g = g[:-1]
                return g
            return ''
        if name == 'attrs':
            return self.target.get('targetattr', None)
        raise AttributeError, "object has no attribute '%s'" % name

    def __setattr__(self, name, value):
        """
        Backward compatibility for the old ACI class.

        The following extra attributes are available:
            - source_group
            - dest_group
            - attrs
        """
        if name == 'source_group':
            self.__dict__['bindrule'] = 'groupdn="ldap:///%s"' % value
        elif name == 'dest_group':
            if value.startswith('('):
                self.__dict__['target']['targetfilter'] = 'memberOf=%s' % value
            else:
                self.__dict__['target']['targetfilter'] = '(memberOf=%s)' % value
        elif name == 'attrs':
            self.__dict__['target']['targetattr'] = value
        elif name in self._objectattrs:
            self.__dict__[name] = value
        else:
            raise AttributeError, "object has no attribute '%s'" % name

    def export_to_string(self):
        """Output a Directory Server-compatible ACI string"""
        self.validate()
        aci = ""
        for t in self.target:
            if isinstance(self.target[t], list):
                target = ""
                for l in self.target[t]:
                    target = target + l + " || "
                target = target[:-4]
                aci = aci + "(%s=\"%s\")" % (t, target)
            else:
                aci = aci + "(%s=\"%s\")" % (t, self.target[t])
        aci = aci + "(version 3.0;acl \"%s\";%s (%s) %s" % (self.name, self.action, ",".join(self.permissions), self.bindrule) + ";)"
        return aci

    def _remove_quotes(self, s):
        # Remove leading and trailing quotes
        if s.startswith('"'):
            s = s[1:]
        if s.endswith('"'):
            s = s[:-1]
        return s

    def _parse_target(self, aci):
        lexer = shlex.shlex(aci)
        lexer.wordchars = lexer.wordchars + "."

        l = []

        var = False
        for token in lexer:
            # We should have the form (a = b)(a = b)...
            if token == "(":
                var = lexer.next().strip()
                operator = lexer.next()
                if operator != "=" and operator != "!=":


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