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# Data sources: Provding data for profile personalization
#
# (C) 2024 by Harald Welte <laforge@osmocom.org>
#
# 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 abc
import secrets
from Cryptodome.Random import get_random_bytes
class DataSource(abc.ABC):
"""Base class for something that can provide data during a personalization process."""
@abc.abstractmethod
def generate_one(self):
pass
class DataSourceFixed(DataSource):
"""A data source that provides a fixed value (of any type).
Parameters:
fixed_value: The fixed value that shall be used during each data generation
"""
def __init__(self, fixed_value, **kwargs):
self.fixed_value = fixed_value
super().__init__(**kwargs)
def generate_one(self):
return self.fixed_value
class DataSourceIncrementing(DataSource):
"""A data source that provides incrementing integer numbers.
Parameters:
base_value: The start value (value returned during first data generation)
step_size: Increment step size (Default: 1)
"""
def __init__(self, base_value: int, **kwargs):
self.base_value = int(base_value)
self.step_size = kwargs.pop('step_size', 1)
self.i = 0
super().__init__(**kwargs)
def generate_one(self):
val = self.base_value + self.i
self.i += self.step_size
return val
class DataSourceRandomBytes(DataSource):
"""A data source that provides a configurable number of random bytes.
Parameters:
size: Number of bytes to generate each turn
"""
def __init__(self, size: int, **kwargs):
self.size = size
super().__init__(**kwargs)
def generate_one(self):
return get_random_bytes(self.size)
class DataSourceRandomUInt(DataSource):
"""A data source that provides a configurable unsigned integer value.
Parameters:
below: Number one greater than the maximum permitted random unsigned integer
"""
def __init__(self, below: int, **kwargs):
self.below = below
super().__init__(**kwargs)
def generate_one(self):
return secrets.randbelow(self.below)
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