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# This file is part of rhizi, a collaborative knowledge graph editor.
# Copyright (C) 2014-2015 Rhizi
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import copy
import logging
import shelve
import sys
from functools import wraps
import rz_user
class Fake_User_DB(object):
def shutdown(self):
pass
class User_DB(object):
"""
Simple user database:
- caller is responsible for calling init() & shutdown()
- users identified by string uid
- unique user email_address constraint enforced
- handle user password authentication
"""
def __init__(self, db_path):
self.user_db_path = db_path
def __iter__(self):
for uid in self.persistent_data_store.keys():
yield self.lookup_user__by_uid(uid) # return sanitized account
def dump_to_file__str(self, output_file_path=None):
"""
Dump record string representation to file
@param output_file_path: if not specified stdout is used
"""
def _write_record(f_out, uid, u):
f_out.write('uid: %s: %s\n' % (uid, str(u)))
if output_file_path:
with open(output_file_path, 'w') as f_out:
for uid, u in self.persistent_data_store.items():
_write_record(f_out, uid, u)
else:
for uid, u in self.persistent_data_store.items():
_write_record(sys.stdout, uid, u)
def init(self, mode='r'):
"""
@param mode: see anydbm.open()
"""
self.persistent_data_store = shelve.open(self.user_db_path, flag=mode, writeback=False) # local handling of writeback
def __process_return_value(self, uid, u):
"""
common lookup function return value processing:
- return dict copies
- sanitize sensitive data
"""
u_ret = copy.copy(u)
del u_ret.pw_hash
return uid, u_ret
def __lookup_user__by_email_address(self, email_address):
# FIXME: avoid linear search
for uid, u in self.persistent_data_store.items():
if u.email_address == email_address:
return uid, u
raise Exception('no user found with email_address=%s' % (email_address))
def __sync_db(f):
@wraps(f)
def f_decorated(self, *args, **kw):
ret = f(self, *args, **kw)
self.persistent_data_store.sync()
return ret
return f_decorated
def lookup_user__by_uid(self, uid):
"""
@return: user record with pw entry removed
"""
assert str == type(uid)
u = self.persistent_data_store.get(uid)
if None == u:
raise Exception('no user found with uid=%s' % (uid))
return self.__process_return_value(uid, u)
def lookup_user__by_email_address(self, email_address):
"""
@return: user record with pw entry removed
"""
uid, u = self.__lookup_user__by_email_address(email_address)
return self.__process_return_value(uid, u)
@__sync_db
def user_add(self, u_account):
"""
@return: the string uid of the newly added user
"""
# apply unique email constraint
for uid, u in self.persistent_data_store.items():
if u.email_address == u_account.email_address:
raise Exception('existing user with identical email address: uid: %s ' % (uid))
assert None != u_account.pw_hash, 'missing pw_hash for new user'
uid = str(len(self.persistent_data_store) + 1)
self.persistent_data_store[uid] = u_account
return uid
@__sync_db
def update_user_password(self, uid, new_plaintxt_pw):
u_account = self.persistent_data_store[uid]
old_pw_hash = u_account.pw_hash
u_account.pw_hash = rz_user.calc_user_pw_hash(new_plaintxt_pw)
self.persistent_data_store[uid] = u_account # write new record
return old_pw_hash
def user_count(self):
return len(self.persistent_data_store.keys())
@__sync_db
def user_rm(self, uid):
del self.persistent_data_store[uid]
@__sync_db
def user_add_role(self, uid, role):
if not self.valid_role(uid, role):
raise Exception("invalid role %s for user %s" % (role, uid))
u = self.persistent_data_store[uid]
u.role_set.append(role)
self.persistent_data_store[uid] = u
@__sync_db
def user_rm_role(self, uid, role):
u = self.persistent_data_store[uid]
i = u.role_set.index(role)
if -1 == i:
return
del u.role_set[i]
self.persistent_data_store[uid] = u
def user_has_role(self, uid, role):
"""
@return: True if user roles contain passed role
"""
u = self.persistent_data_store[uid]
return role in u.role_set
def valid_role(self, uid, role):
"""
@return: True if role is appropriate for uid. Currently ignores uid
"""
return role in ['admin', 'user']
def validate_login(self, email_address, pw_hash):
_, u_account = self.__lookup_user__by_email_address(email_address)
existing_pw_hash = u_account.pw_hash
assert None != existing_pw_hash, 'missing pw_hash for existing user'
if pw_hash != existing_pw_hash:
raise Exception('Not authorized')
def shutdown(self):
self.persistent_data_store.close()
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