cic-stack/apps/cic-ussd/cic_ussd/validator.py
2021-04-09 13:00:15 +00:00

149 lines
4.3 KiB
Python

# standard imports
import logging
import os
import re
import ipaddress
# third-party imports
from confini import Config
# local imports
from cic_ussd.db.models.user import User
logg = logging.getLogger(__file__)
def check_ip(config: Config, env: dict):
"""Check whether request origin IP is whitelisted
:param config: A dictionary object containing configuration values
:type config: Config
:param env: Object containing server and request information
:type env: dict
:return: Request IP validity
:rtype: boolean
"""
# TODO: do once at boot time
actual_ip = ipaddress.ip_network(env.get('REMOTE_ADDR') + '/32')
for allowed_net_src in config.get('APP_ALLOWED_IP').split(','):
allowed_net = ipaddress.ip_network(allowed_net_src)
if actual_ip.subnet_of(allowed_net):
return True
return False
def check_request_content_length(config: Config, env: dict):
"""Checks whether the request's content is less than or equal to the system's set maximum content length
:param config: A dictionary object containing configuration values
:type config: Config
:param env: Object containing server and request information
:type env: dict
:return: Content length validity
:rtype: boolean
"""
return env.get('CONTENT_LENGTH') is not None and int(env.get('CONTENT_LENGTH')) <= int(
config.get('APP_MAX_BODY_LENGTH'))
def check_service_code(code: str, config: Config):
"""Checks whether provided code matches expected service code
:param config: A dictionary object containing configuration values
:type config: Config
:param code: Service code passed over request
:type code: str
:return: Service code validity
:rtype: boolean
"""
return code == config.get('APP_SERVICE_CODE')
def check_known_user(phone: str):
"""
This method attempts to ascertain whether the user already exists and is known to the system.
It sends a get request to the platform application and attempts to retrieve the user's data which it persists in
memory.
:param phone: A valid phone number
:type phone: str
:return: Is known phone number
:rtype: boolean
"""
user = User.session.query(User).filter_by(phone_number=phone).first()
return user is not None
def check_phone_number(number: str):
"""
Checks whether phone number is present
:param number: A valid phone number
:type number: str
:return: Phone number presence
:rtype: boolean
"""
return number is not None
def check_request_method(env: dict):
"""
Checks whether request method is POST
:param env: Object containing server and request information
:type env: dict
:return: Request method validity
:rtype: boolean
"""
return env.get('REQUEST_METHOD').upper() == 'POST'
def check_session_id(session_id: str):
"""
Checks whether session id is present
:param session_id: Session id value provided by AT
:type session_id: str
:return: Session id presence
:rtype: boolean
"""
return session_id is not None
def validate_phone_number(phone: str):
"""
Check if phone number is in the correct format.
:param phone: The phone number to be validated.
:rtype phone: str
:return: Whether the phone number is of the correct format.
:rtype: bool
"""
if phone and re.match('[+]?[0-9]{10,12}$', phone):
return True
return False
def validate_response_type(processor_response: str) -> bool:
"""
This function checks the prefix for a corresponding menu's text from the response offered by the Ussd Processor and
determines whether the response should prompt the end of a ussd session or the
:param processor_response: A ussd menu's text value.
:type processor_response: str
:return: Value representing validity of a response.
:rtype: bool
"""
matcher = r'^(CON|END)'
if len(processor_response) > 164:
logg.warning(f'Warning, text has length {len(processor_response)}, display may be truncated')
if re.match(matcher, processor_response):
return True
return False
def validate_presence(path: str):
"""
"""
is_present = os.path.exists(path=path)
if not is_present:
raise ValueError(f'Directory/File in path: {path} not found.')
else:
logg.debug(f'Loading data from: {path}')