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# -*- coding: utf-8 -*- |
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# Copyright 2018 Telefonica S.A. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
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# implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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import yaml |
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import logging |
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import re |
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from http import HTTPStatus |
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from copy import deepcopy |
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from Crypto.Cipher import AES |
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from base64 import b64decode, b64encode |
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from osm_common.common_utils import FakeLock |
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from threading import Lock |
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__author__ = "Alfonso Tierno <alfonso.tiernosepulveda@telefonica.com>" |
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class DbException(Exception): |
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def __init__(self, message, http_code=HTTPStatus.NOT_FOUND): |
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self.http_code = http_code |
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Exception.__init__(self, "database exception " + str(message)) |
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class DbBase(object): |
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def __init__(self, logger_name='db', lock=False): |
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""" |
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Constructor of dbBase |
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:param logger_name: logging name |
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:param lock: Used to protect simultaneous access to the same instance class by several threads: |
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False, None: Do not protect, this object will only be accessed by one thread |
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True: This object needs to be protected by several threads accessing. |
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Lock object. Use thi Lock for the threads access protection |
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""" |
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self.logger = logging.getLogger(logger_name) |
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self.secret_key = None # 32 bytes length array used for encrypt/decrypt |
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if not lock: |
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self.lock = FakeLock() |
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elif lock is True: |
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self.lock = Lock() |
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elif isinstance(lock, Lock): |
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self.lock = lock |
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else: |
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raise ValueError("lock parameter must be a Lock classclass or boolean") |
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def db_connect(self, config, target_version=None): |
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""" |
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Connect to database |
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:param config: Configuration of database. Contains among others: |
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host: database host (mandatory) |
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port: database port (mandatory) |
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name: database name (mandatory) |
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user: database username |
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password: database password |
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commonkey: common OSM key used for sensible information encryption |
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materpassword: same as commonkey, for backward compatibility. Deprecated, to be removed in the future |
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:param target_version: if provided it checks if database contains required version, raising exception otherwise. |
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:return: None or raises DbException on error |
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""" |
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raise DbException("Method 'db_connect' not implemented") |
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def db_disconnect(self): |
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""" |
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Disconnect from database |
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:return: None |
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""" |
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pass |
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def get_list(self, table, q_filter=None): |
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""" |
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Obtain a list of entries matching q_filter |
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:param table: collection or table |
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:param q_filter: Filter |
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:return: a list (can be empty) with the found entries. Raises DbException on error |
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""" |
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raise DbException("Method 'get_list' not implemented") |
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def count(self, table, q_filter=None): |
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""" |
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Count the number of entries matching q_filter |
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:param table: collection or table |
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:param q_filter: Filter |
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:return: number of entries found (can be zero) |
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:raise: DbException on error |
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""" |
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raise DbException("Method 'count' not implemented") |
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def get_one(self, table, q_filter=None, fail_on_empty=True, fail_on_more=True): |
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""" |
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Obtain one entry matching q_filter |
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:param table: collection or table |
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:param q_filter: Filter |
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:param fail_on_empty: If nothing matches filter it returns None unless this flag is set tu True, in which case |
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it raises a DbException |
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:param fail_on_more: If more than one matches filter it returns one of then unless this flag is set tu True, so |
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that it raises a DbException |
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:return: The requested element, or None |
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""" |
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raise DbException("Method 'get_one' not implemented") |
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def del_list(self, table, q_filter=None): |
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""" |
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Deletes all entries that match q_filter |
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:param table: collection or table |
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:param q_filter: Filter |
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:return: Dict with the number of entries deleted |
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""" |
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raise DbException("Method 'del_list' not implemented") |
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def del_one(self, table, q_filter=None, fail_on_empty=True): |
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""" |
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Deletes one entry that matches q_filter |
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:param table: collection or table |
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:param q_filter: Filter |
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:param fail_on_empty: If nothing matches filter it returns '0' deleted unless this flag is set tu True, in |
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which case it raises a DbException |
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:return: Dict with the number of entries deleted |
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""" |
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raise DbException("Method 'del_one' not implemented") |
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def create(self, table, indata): |
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""" |
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Add a new entry at database |
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:param table: collection or table |
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:param indata: content to be added |
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:return: database '_id' of the inserted element. Raises a DbException on error |
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""" |
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raise DbException("Method 'create' not implemented") |
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def create_list(self, table, indata_list): |
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""" |
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Add several entries at once |
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:param table: collection or table |
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:param indata_list: list of elements to insert. Each element must be a dictionary. |
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An '_id' key based on random uuid is added at each element if missing |
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:return: list of inserted '_id's. Exception on error |
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""" |
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raise DbException("Method 'create_list' not implemented") |
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def set_one(self, table, q_filter, update_dict, fail_on_empty=True, unset=None, pull=None, push=None, |
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push_list=None, pull_list=None): |
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""" |
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Modifies an entry at database |
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:param table: collection or table |
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:param q_filter: Filter |
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:param update_dict: Plain dictionary with the content to be updated. It is a dot separated keys and a value |
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:param fail_on_empty: If nothing matches filter it returns None unless this flag is set tu True, in which case |
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it raises a DbException |
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:param unset: Plain dictionary with the content to be removed if exist. It is a dot separated keys, value is |
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ignored. If not exist, it is ignored |
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:param pull: Plain dictionary with the content to be removed from an array. It is a dot separated keys and value |
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if exist in the array is removed. If not exist, it is ignored |
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:param push: Plain dictionary with the content to be appended to an array. It is a dot separated keys and value |
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is appended to the end of the array |
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:param pull_list: Same as pull but values are arrays where each item is removed from the array |
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:param push_list: Same as push but values are arrays where each item is and appended instead of appending the |
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whole array |
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:return: Dict with the number of entries modified. None if no matching is found. |
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""" |
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raise DbException("Method 'set_one' not implemented") |
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def set_list(self, table, q_filter, update_dict, unset=None, pull=None, push=None, push_list=None, pull_list=None): |
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""" |
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Modifies al matching entries at database |
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:param table: collection or table |
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:param q_filter: Filter |
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:param update_dict: Plain dictionary with the content to be updated. It is a dot separated keys and a value |
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:param unset: Plain dictionary with the content to be removed if exist. It is a dot separated keys, value is |
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ignored. If not exist, it is ignored |
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:param pull: Plain dictionary with the content to be removed from an array. It is a dot separated keys and value |
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if exist in the array is removed. If not exist, it is ignored |
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:param push: Plain dictionary with the content to be appended to an array. It is a dot separated keys and value |
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is appended to the end of the array |
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:param pull_list: Same as pull but values are arrays where each item is removed from the array |
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:param push_list: Same as push but values are arrays where each item is and appended instead of appending the |
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whole array |
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:return: Dict with the number of entries modified |
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""" |
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raise DbException("Method 'set_list' not implemented") |
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def replace(self, table, _id, indata, fail_on_empty=True): |
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""" |
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Replace the content of an entry |
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:param table: collection or table |
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:param _id: internal database id |
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:param indata: content to replace |
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:param fail_on_empty: If nothing matches filter it returns None unless this flag is set tu True, in which case |
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it raises a DbException |
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:return: Dict with the number of entries replaced |
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""" |
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raise DbException("Method 'replace' not implemented") |
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def _join_secret_key(self, update_key): |
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""" |
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Returns a xor byte combination of the internal secret_key and the provided update_key. |
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It does not modify the internal secret_key. Used for adding salt, join keys, etc. |
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:param update_key: Can be a string, byte or None. Recommended a long one (e.g. 32 byte length) |
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:return: joined key in bytes with a 32 bytes length. Can be None if both internal secret_key and update_key |
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are None |
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""" |
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if not update_key: |
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return self.secret_key |
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elif isinstance(update_key, str): |
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update_key_bytes = update_key.encode() |
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else: |
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update_key_bytes = update_key |
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new_secret_key = bytearray(self.secret_key) if self.secret_key else bytearray(32) |
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for i, b in enumerate(update_key_bytes): |
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new_secret_key[i % 32] ^= b |
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return bytes(new_secret_key) |
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def set_secret_key(self, new_secret_key, replace=False): |
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""" |
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Updates internal secret_key used for encryption, with a byte xor |
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:param new_secret_key: string or byte array. It is recommended a 32 byte length |
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:param replace: if True, old value of internal secret_key is ignored and replaced. If false, a byte xor is used |
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:return: None |
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""" |
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if replace: |
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self.secret_key = None |
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self.secret_key = self._join_secret_key(new_secret_key) |
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def get_secret_key(self): |
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""" |
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Get the database secret key in case it is not done when "connect" is called. It can happens when database is |
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empty after an initial install. It should skip if secret is already obtained. |
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""" |
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pass |
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def encrypt(self, value, schema_version=None, salt=None): |
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""" |
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Encrypt a value |
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:param value: value to be encrypted. It is string/unicode |
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:param schema_version: used for version control. If None or '1.0' no encryption is done. |
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If '1.1' symmetric AES encryption is done |
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:param salt: optional salt to be used. Must be str |
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:return: Encrypted content of value |
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""" |
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self.get_secret_key() |
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if not self.secret_key or not schema_version or schema_version == '1.0': |
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return value |
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else: |
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secret_key = self._join_secret_key(salt) |
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cipher = AES.new(secret_key) |
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padded_private_msg = value + ('\0' * ((16-len(value)) % 16)) |
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encrypted_msg = cipher.encrypt(padded_private_msg) |
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encoded_encrypted_msg = b64encode(encrypted_msg) |
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return encoded_encrypted_msg.decode("ascii") |
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def decrypt(self, value, schema_version=None, salt=None): |
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""" |
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Decrypt an encrypted value |
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:param value: value to be decrypted. It is a base64 string |
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:param schema_version: used for known encryption method used. If None or '1.0' no encryption has been done. |
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If '1.1' symmetric AES encryption has been done |
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:param salt: optional salt to be used |
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:return: Plain content of value |
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""" |
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self.get_secret_key() |
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if not self.secret_key or not schema_version or schema_version == '1.0': |
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return value |
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else: |
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secret_key = self._join_secret_key(salt) |
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encrypted_msg = b64decode(value) |
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cipher = AES.new(secret_key) |
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decrypted_msg = cipher.decrypt(encrypted_msg) |
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try: |
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unpadded_private_msg = decrypted_msg.decode().rstrip('\0') |
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except UnicodeDecodeError: |
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raise DbException("Cannot decrypt information. Are you using same COMMONKEY in all OSM components?", |
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http_code=HTTPStatus.INTERNAL_SERVER_ERROR) |
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return unpadded_private_msg |
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def encrypt_decrypt_fields(self, item, action, fields=None, flags=None, schema_version=None, salt=None): |
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if not fields: |
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return |
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self.get_secret_key() |
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actions = ['encrypt', 'decrypt'] |
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if action.lower() not in actions: |
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raise DbException("Unknown action ({}): Must be one of {}".format(action, actions), |
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http_code=HTTPStatus.INTERNAL_SERVER_ERROR) |
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method = self.encrypt if action.lower() == 'encrypt' else self.decrypt |
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if flags is None: |
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flags = re.I |
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|
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def process(_item): |
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if isinstance(_item, list): |
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for elem in _item: |
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process(elem) |
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elif isinstance(_item, dict): |
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for key, val in _item.items(): |
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if isinstance(val, str): |
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if any(re.search(f, key, flags) for f in fields): |
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_item[key] = method(val, schema_version, salt) |
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else: |
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process(val) |
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process(item) |
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|
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|
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def deep_update_rfc7396(dict_to_change, dict_reference, key_list=None): |
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""" |
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Modifies one dictionary with the information of the other following https://tools.ietf.org/html/rfc7396 |
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Basically is a recursive python 'dict_to_change.update(dict_reference)', but a value of None is used to delete. |
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It implements an extra feature that allows modifying an array. RFC7396 only allows replacing the entire array. |
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For that, dict_reference should contains a dict with keys starting by "$" with the following meaning: |
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$[index] <index> is an integer for targeting a concrete index from dict_to_change array. If the value is None |
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the element of the array is deleted, otherwise it is edited. |
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$+[index] The value is inserted at this <index>. A value of None has not sense and an exception is raised. |
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$+ The value is appended at the end. A value of None has not sense and an exception is raised. |
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$val It looks for all the items in the array dict_to_change equal to <val>. <val> is evaluated as yaml, |
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that is, numbers are taken as type int, true/false as boolean, etc. Use quotes to force string. |
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Nothing happens if no match is found. If the value is None the matched elements are deleted. |
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$key: val In case a dictionary is passed in yaml format, if looks for all items in the array dict_to_change |
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that are dictionaries and contains this <key> equal to <val>. Several keys can be used by yaml |
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format '{key: val, key: val, ...}'; and all of them must match. Nothing happens if no match is |
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found. If value is None the matched items are deleted, otherwise they are edited. |
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$+val If no match if found (see '$val'), the value is appended to the array. If any match is found nothing |
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is changed. A value of None has not sense. |
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$+key: val If no match if found (see '$key: val'), the value is appended to the array. If any match is found |
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nothing is changed. A value of None has not sense. |
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If there are several editions, insertions and deletions; editions and deletions are done first in reverse index |
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order; then insertions also in reverse index order; and finally appends in any order. So indexes used at |
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insertions must take into account the deleted items. |
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:param dict_to_change: Target dictionary to be changed. |
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:param dict_reference: Dictionary that contains changes to be applied. |
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:param key_list: This is used internally for recursive calls. Do not fill this parameter. |
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:return: none or raises and exception only at array modification when there is a bad format or conflict. |
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""" |
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def _deep_update_array(array_to_change, _dict_reference, _key_list): |
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to_append = {} |
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1 |
to_insert_at_index = {} |
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1 |
values_to_edit_delete = {} |
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indexes_to_edit_delete = [] |
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array_edition = None |
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_key_list.append("") |
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for k in _dict_reference: |
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_key_list[-1] = str(k) |
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if not isinstance(k, str) or not k.startswith("$"): |
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if array_edition is True: |
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raise DbException("Found array edition (keys starting with '$') and pure dictionary edition in the" |
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" same dict at '{}'".format(":".join(_key_list[:-1]))) |
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array_edition = False |
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1 |
continue |
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else: |
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1 |
if array_edition is False: |
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0 |
raise DbException("Found array edition (keys starting with '$') and pure dictionary edition in the" |
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" same dict at '{}'".format(":".join(_key_list[:-1]))) |
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1 |
array_edition = True |
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1 |
insert = False |
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1 |
indexes = [] # indexes to edit or insert |
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1 |
kitem = k[1:] |
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1 |
if kitem.startswith('+'): |
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1 |
insert = True |
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kitem = kitem[1:] |
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1 |
if _dict_reference[k] is None: |
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1 |
raise DbException("A value of None has not sense for insertions at '{}'".format( |
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":".join(_key_list))) |
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|
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1 |
if kitem.startswith('[') and kitem.endswith(']'): |
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1 |
try: |
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1 |
index = int(kitem[1:-1]) |
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1 |
if index < 0: |
| 378 |
1 |
index += len(array_to_change) |
| 379 |
1 |
if index < 0: |
| 380 |
0 |
index = 0 # skip outside index edition |
| 381 |
1 |
indexes.append(index) |
| 382 |
0 |
except Exception: |
| 383 |
0 |
raise DbException("Wrong format at '{}'. Expecting integer index inside quotes".format( |
| 384 |
|
":".join(_key_list))) |
| 385 |
1 |
elif kitem: |
| 386 |
|
# match_found_skip = False |
| 387 |
1 |
try: |
| 388 |
1 |
filter_in = yaml.safe_load(kitem) |
| 389 |
1 |
except Exception: |
| 390 |
1 |
raise DbException("Wrong format at '{}'. Expecting '$<yaml-format>'".format(":".join(_key_list))) |
| 391 |
1 |
if isinstance(filter_in, dict): |
| 392 |
1 |
for index, item in enumerate(array_to_change): |
| 393 |
1 |
for filter_k, filter_v in filter_in.items(): |
| 394 |
1 |
if not isinstance(item, dict) or filter_k not in item or item[filter_k] != filter_v: |
| 395 |
1 |
break |
| 396 |
|
else: # match found |
| 397 |
1 |
if insert: |
| 398 |
|
# match_found_skip = True |
| 399 |
0 |
insert = False |
| 400 |
0 |
break |
| 401 |
|
else: |
| 402 |
1 |
indexes.append(index) |
| 403 |
|
else: |
| 404 |
1 |
index = 0 |
| 405 |
1 |
try: |
| 406 |
1 |
while True: # if not match a ValueError exception will be raise |
| 407 |
1 |
index = array_to_change.index(filter_in, index) |
| 408 |
1 |
if insert: |
| 409 |
|
# match_found_skip = True |
| 410 |
1 |
insert = False |
| 411 |
1 |
break |
| 412 |
1 |
indexes.append(index) |
| 413 |
1 |
index += 1 |
| 414 |
1 |
except ValueError: |
| 415 |
1 |
pass |
| 416 |
|
|
| 417 |
|
# if match_found_skip: |
| 418 |
|
# continue |
| 419 |
1 |
elif not insert: |
| 420 |
1 |
raise DbException("Wrong format at '{}'. Expecting '$+', '$[<index]' or '$[<filter>]'".format( |
| 421 |
|
":".join(_key_list))) |
| 422 |
1 |
for index in indexes: |
| 423 |
1 |
if insert: |
| 424 |
1 |
if index in to_insert_at_index and to_insert_at_index[index] != _dict_reference[k]: |
| 425 |
|
# Several different insertions on the same item of the array |
| 426 |
0 |
raise DbException("Conflict at '{}'. Several insertions on same array index {}".format( |
| 427 |
|
":".join(_key_list), index)) |
| 428 |
1 |
to_insert_at_index[index] = _dict_reference[k] |
| 429 |
|
else: |
| 430 |
1 |
if index in indexes_to_edit_delete and values_to_edit_delete[index] != _dict_reference[k]: |
| 431 |
|
# Several different editions on the same item of the array |
| 432 |
1 |
raise DbException("Conflict at '{}'. Several editions on array index {}".format( |
| 433 |
|
":".join(_key_list), index)) |
| 434 |
1 |
indexes_to_edit_delete.append(index) |
| 435 |
1 |
values_to_edit_delete[index] = _dict_reference[k] |
| 436 |
1 |
if not indexes: |
| 437 |
1 |
if insert: |
| 438 |
1 |
to_append[k] = _dict_reference[k] |
| 439 |
|
# elif _dict_reference[k] is not None: |
| 440 |
|
# raise DbException("Not found any match to edit in the array, or wrong format at '{}'".format( |
| 441 |
|
# ":".join(_key_list))) |
| 442 |
|
|
| 443 |
|
# edition/deletion is done before insertion |
| 444 |
1 |
indexes_to_edit_delete.sort(reverse=True) |
| 445 |
1 |
for index in indexes_to_edit_delete: |
| 446 |
1 |
_key_list[-1] = str(index) |
| 447 |
1 |
try: |
| 448 |
1 |
if values_to_edit_delete[index] is None: # None->Anything |
| 449 |
1 |
try: |
| 450 |
1 |
del (array_to_change[index]) |
| 451 |
1 |
except IndexError: |
| 452 |
1 |
pass # it is not consider an error if this index does not exist |
| 453 |
1 |
elif not isinstance(values_to_edit_delete[index], dict): # NotDict->Anything |
| 454 |
1 |
array_to_change[index] = deepcopy(values_to_edit_delete[index]) |
| 455 |
1 |
elif isinstance(array_to_change[index], dict): # Dict->Dict |
| 456 |
1 |
deep_update_rfc7396(array_to_change[index], values_to_edit_delete[index], _key_list) |
| 457 |
|
else: # Dict->NotDict |
| 458 |
1 |
if isinstance(array_to_change[index], list): # Dict->List. Check extra array edition |
| 459 |
1 |
if _deep_update_array(array_to_change[index], values_to_edit_delete[index], _key_list): |
| 460 |
1 |
continue |
| 461 |
1 |
array_to_change[index] = deepcopy(values_to_edit_delete[index]) |
| 462 |
|
# calling deep_update_rfc7396 to delete the None values |
| 463 |
1 |
deep_update_rfc7396(array_to_change[index], values_to_edit_delete[index], _key_list) |
| 464 |
1 |
except IndexError: |
| 465 |
1 |
raise DbException("Array edition index out of range at '{}'".format(":".join(_key_list))) |
| 466 |
|
|
| 467 |
|
# insertion with indexes |
| 468 |
1 |
to_insert_indexes = list(to_insert_at_index.keys()) |
| 469 |
1 |
to_insert_indexes.sort(reverse=True) |
| 470 |
1 |
for index in to_insert_indexes: |
| 471 |
1 |
array_to_change.insert(index, to_insert_at_index[index]) |
| 472 |
|
|
| 473 |
|
# append |
| 474 |
1 |
for k, insert_value in to_append.items(): |
| 475 |
1 |
_key_list[-1] = str(k) |
| 476 |
1 |
insert_value_copy = deepcopy(insert_value) |
| 477 |
1 |
if isinstance(insert_value_copy, dict): |
| 478 |
|
# calling deep_update_rfc7396 to delete the None values |
| 479 |
0 |
deep_update_rfc7396(insert_value_copy, insert_value, _key_list) |
| 480 |
1 |
array_to_change.append(insert_value_copy) |
| 481 |
|
|
| 482 |
1 |
_key_list.pop() |
| 483 |
1 |
if array_edition: |
| 484 |
1 |
return True |
| 485 |
1 |
return False |
| 486 |
|
|
| 487 |
1 |
if key_list is None: |
| 488 |
1 |
key_list = [] |
| 489 |
1 |
key_list.append("") |
| 490 |
1 |
for k in dict_reference: |
| 491 |
1 |
key_list[-1] = str(k) |
| 492 |
1 |
if dict_reference[k] is None: # None->Anything |
| 493 |
1 |
if k in dict_to_change: |
| 494 |
1 |
del dict_to_change[k] |
| 495 |
1 |
elif not isinstance(dict_reference[k], dict): # NotDict->Anything |
| 496 |
1 |
dict_to_change[k] = deepcopy(dict_reference[k]) |
| 497 |
1 |
elif k not in dict_to_change: # Dict->Empty |
| 498 |
1 |
dict_to_change[k] = deepcopy(dict_reference[k]) |
| 499 |
|
# calling deep_update_rfc7396 to delete the None values |
| 500 |
1 |
deep_update_rfc7396(dict_to_change[k], dict_reference[k], key_list) |
| 501 |
1 |
elif isinstance(dict_to_change[k], dict): # Dict->Dict |
| 502 |
1 |
deep_update_rfc7396(dict_to_change[k], dict_reference[k], key_list) |
| 503 |
|
else: # Dict->NotDict |
| 504 |
1 |
if isinstance(dict_to_change[k], list): # Dict->List. Check extra array edition |
| 505 |
1 |
if _deep_update_array(dict_to_change[k], dict_reference[k], key_list): |
| 506 |
1 |
continue |
| 507 |
1 |
dict_to_change[k] = deepcopy(dict_reference[k]) |
| 508 |
|
# calling deep_update_rfc7396 to delete the None values |
| 509 |
1 |
deep_update_rfc7396(dict_to_change[k], dict_reference[k], key_list) |
| 510 |
1 |
key_list.pop() |
| 511 |
|
|
| 512 |
|
|
| 513 |
1 |
def deep_update(dict_to_change, dict_reference): |
| 514 |
|
""" Maintained for backward compatibility. Use deep_update_rfc7396 instead""" |
| 515 |
1 |
return deep_update_rfc7396(dict_to_change, dict_reference) |
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