144 lines
5.6 KiB
Python
144 lines
5.6 KiB
Python
"""This module defines functions responsible for creation, validation, reset and any other manipulations on the
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user's pin.
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"""
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# standard imports
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import json
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import logging
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import re
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from typing import Tuple
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# third party imports
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import bcrypt
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# local imports
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from cic_ussd.db.models.account import AccountStatus, Account
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from cic_ussd.encoder import PasswordEncoder, create_password_hash
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from cic_ussd.operations import persist_session_to_db_task, create_or_update_session
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from cic_ussd.redis import InMemoryStore
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logg = logging.getLogger(__file__)
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def is_valid_pin(state_machine_data: Tuple[str, dict, Account]) -> bool:
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"""This function checks a pin's validity by ensuring it has a length of for characters and the characters are
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numeric.
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:param state_machine_data: A tuple containing user input, a ussd session and user object.
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:type state_machine_data: tuple
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:return: A pin's validity
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:rtype: bool
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"""
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user_input, ussd_session, user = state_machine_data
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pin_is_valid = False
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matcher = r'^\d{4}$'
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if re.match(matcher, user_input):
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pin_is_valid = True
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return pin_is_valid
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def is_authorized_pin(state_machine_data: Tuple[str, dict, Account]) -> bool:
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"""This function checks whether the user input confirming a specific pin matches the initial pin entered.
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:param state_machine_data: A tuple containing user input, a ussd session and user object.
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:type state_machine_data: tuple
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:return: A match between two pin values.
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:rtype: bool
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"""
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user_input, ussd_session, user = state_machine_data
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return user.verify_password(password=user_input)
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def is_locked_account(state_machine_data: Tuple[str, dict, Account]) -> bool:
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"""This function checks whether a user's account is locked due to too many failed attempts.
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:param state_machine_data: A tuple containing user input, a ussd session and user object.
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:type state_machine_data: tuple
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:return: A match between two pin values.
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:rtype: bool
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"""
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user_input, ussd_session, user = state_machine_data
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return user.get_account_status() == AccountStatus.LOCKED.name
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def save_initial_pin_to_session_data(state_machine_data: Tuple[str, dict, Account]):
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"""This function hashes a pin and stores it in session data.
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:param state_machine_data: A tuple containing user input, a ussd session and user object.
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:type state_machine_data: tuple
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"""
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user_input, ussd_session, user = state_machine_data
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# define redis cache entry point
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cache = InMemoryStore.cache
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# get external session id
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external_session_id = ussd_session.get('external_session_id')
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# get corresponding session record
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in_redis_ussd_session = cache.get(external_session_id)
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in_redis_ussd_session = json.loads(in_redis_ussd_session)
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# set initial pin data
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initial_pin = create_password_hash(user_input)
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session_data = {
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'initial_pin': initial_pin
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}
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# create new in memory ussd session with current ussd session data
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create_or_update_session(
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external_session_id=external_session_id,
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phone=in_redis_ussd_session.get('msisdn'),
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service_code=in_redis_ussd_session.get('service_code'),
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user_input=user_input,
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current_menu=in_redis_ussd_session.get('state'),
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session_data=session_data
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)
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persist_session_to_db_task(external_session_id=external_session_id, queue='cic-ussd')
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def pins_match(state_machine_data: Tuple[str, dict, Account]) -> bool:
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"""This function checks whether the user input confirming a specific pin matches the initial pin entered.
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:param state_machine_data: A tuple containing user input, a ussd session and user object.
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:type state_machine_data: tuple
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:return: A match between two pin values.
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:rtype: bool
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"""
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user_input, ussd_session, user = state_machine_data
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initial_pin = ussd_session.get('session_data').get('initial_pin')
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fernet = PasswordEncoder(PasswordEncoder.key)
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initial_pin = fernet.decrypt(initial_pin.encode())
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return bcrypt.checkpw(user_input.encode(), initial_pin)
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def complete_pin_change(state_machine_data: Tuple[str, dict, Account]):
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"""This function persists the user's pin to the database
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:param state_machine_data: A tuple containing user input, a ussd session and user object.
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:type state_machine_data: tuple
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"""
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user_input, ussd_session, user = state_machine_data
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password_hash = ussd_session.get('session_data').get('initial_pin')
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user.password_hash = password_hash
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Account.session.add(user)
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Account.session.commit()
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def is_blocked_pin(state_machine_data: Tuple[str, dict, Account]) -> bool:
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"""This function checks whether the user input confirming a specific pin matches the initial pin entered.
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:param state_machine_data: A tuple containing user input, a ussd session and user object.
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:type state_machine_data: tuple
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:return: A match between two pin values.
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:rtype: bool
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"""
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user_input, ussd_session, user = state_machine_data
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return user.get_account_status() == AccountStatus.LOCKED.name
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def is_valid_new_pin(state_machine_data: Tuple[str, dict, Account]) -> bool:
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"""This function checks whether the user's new pin is a valid pin and that it isn't the same as the old one.
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:param state_machine_data: A tuple containing user input, a ussd session and user object.
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:type state_machine_data: tuple
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:return: A match between two pin values.
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:rtype: bool
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"""
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user_input, ussd_session, user = state_machine_data
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is_old_pin = user.verify_password(password=user_input)
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return is_valid_pin(state_machine_data=state_machine_data) and not is_old_pin
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