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"""Provide a more Pythonic and object-oriented interface to ldb."""
#
# Swig interface to Samba
#
# Copyright (C) Tim Potter 2006
#
# 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; either version 3 of the License, or
# (at your option) any later version.
#
# 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, see <http://www.gnu.org/licenses/>.
#
#
# Interface notes:
#
# - should an empty dn be represented as None, or an empty string?
#
# - should single-valued attributes be a string, or a list with one
# element?
#
from ldb import *
# Global initialisation
result = ldb_global_init()
if result != 0:
raise LdbError, (result, 'ldb_global_init failed')
# Ldb exceptions
class LdbError(Exception):
"""An exception raised when a ldb error occurs.
The exception data is a tuple consisting of the ldb number and a
string description of the error."""
pass
# Ldb classes
class LdbMessage:
"""A class representing a ldb message as a Python dictionary."""
def __init__(self):
self.mem_ctx = talloc_init(None)
self.msg = ldb_msg_new(self.mem_ctx)
def __del__(self):
if self.mem_ctx is not None:
talloc_free(self.mem_ctx)
self.mem_ctx = None
self.msg = None
# Make the dn attribute of the object dynamic
def __getattr__(self, attr):
if attr == 'dn':
return ldb_dn_linearize(None, self.msg.dn)
return self.__dict__[attr]
def __setattr__(self, attr, value):
if attr == 'dn':
self.msg.dn = ldb_dn_explode(self.msg, value)
if self.msg.dn == None:
err = LDB_ERR_INVALID_DN_SYNTAX
raise LdbError(err, ldb_strerror(err))
return
self.__dict__[attr] = value
# Get and set individual elements
def __getitem__(self, key):
elt = ldb_msg_find_element(self.msg, key)
if elt is None:
raise KeyError, "No such attribute '%s'" % key
return [ldb_val_array_getitem(elt.values, i)
for i in range(elt.num_values)]
def __setitem__(self, key, value):
ldb_msg_remove_attr(self.msg, key)
if type(value) in (list, tuple):
[ldb_msg_add_value(self.msg, key, v) for v in value]
else:
ldb_msg_add_value(self.msg, key, value)
# Dictionary interface
# TODO: move to iterator based interface
def len(self):
return self.msg.num_elements
def keys(self):
return [ldb_message_element_array_getitem(self.msg.elements, i).name
for i in range(self.msg.num_elements)]
def values(self):
return [self[k] for k in self.keys()]
def items(self):
return [(k, self[k]) for k in self.keys()]
# Misc stuff
def sanity_check(self):
return ldb_msg_sanity_check(self.msg)
class Ldb:
"""A class representing a binding to a ldb file."""
def __init__(self, url, flags = 0):
"""Initialise underlying ldb."""
self.mem_ctx = talloc_init('mem_ctx for ldb 0x%x' % id(self))
self.ldb_ctx = ldb_init(self.mem_ctx)
result = ldb_connect(self.ldb_ctx, url, flags, None)
if result != LDB_SUCCESS:
raise LdbError, (result, ldb_strerror(result))
def __del__(self):
"""Called when the object is to be garbage collected."""
self.close()
def close(self):
"""Close down a ldb."""
if self.mem_ctx is not None:
talloc_free(self.mem_ctx)
self.mem_ctx = None
self.ldb_ctx = None
def _ldb_call(self, fn, *args):
"""Call a ldb function with args. Raise a LdbError exception
if the function returns a non-zero return value."""
result = fn(*args)
if result != LDB_SUCCESS:
raise LdbError, (result, ldb_strerror(result))
def search(self, expression):
"""Search a ldb for a given expression."""
self._ldb_call(ldb_search, self.ldb_ctx, None, LDB_SCOPE_DEFAULT,
expression, None);
return [LdbMessage(ldb_message_ptr_array_getitem(result.msgs, ndx))
for ndx in range(result.count)]
def delete(self, dn):
"""Delete a dn."""
_dn = ldb_dn_explode(self.ldb_ctx, dn)
self._ldb_call(ldb_delete, self.ldb_ctx, _dn)
def rename(self, olddn, newdn):
"""Rename a dn."""
_olddn = ldb_dn_explode(self.ldb_ctx, olddn)
_newdn = ldb_dn_explode(self.ldb_ctx, newdn)
self._ldb_call(ldb_rename, self.ldb_ctx, _olddn, _newdn)
def add(self, m):
self._ldb_call(ldb_add, self.ldb_ctx, m.msg)
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