183 lines
7.4 KiB
Python
183 lines
7.4 KiB
Python
"""Functions defining WSGI interaction with external http requests
|
|
Defines an application function essential for the uWSGI python loader to run th python application code.
|
|
"""
|
|
# standard imports
|
|
import argparse
|
|
import celery
|
|
import i18n
|
|
import json
|
|
import logging
|
|
import os
|
|
import redis
|
|
|
|
# third-party imports
|
|
from confini import Config
|
|
from urllib.parse import quote_plus
|
|
|
|
# local imports
|
|
from cic_ussd.db import dsn_from_config
|
|
from cic_ussd.db.models.base import SessionBase
|
|
from cic_ussd.encoder import PasswordEncoder
|
|
from cic_ussd.files.local_files import create_local_file_data_stores, json_file_parser
|
|
from cic_ussd.menu.ussd_menu import UssdMenu
|
|
from cic_ussd.operations import (define_response_with_content,
|
|
process_menu_interaction_requests,
|
|
define_multilingual_responses)
|
|
from cic_ussd.redis import InMemoryStore
|
|
from cic_ussd.requests import (get_request_endpoint,
|
|
get_request_method,
|
|
get_query_parameters,
|
|
process_locked_accounts_requests,
|
|
process_pin_reset_requests)
|
|
from cic_ussd.session.ussd_session import UssdSession as InMemoryUssdSession
|
|
from cic_ussd.state_machine import UssdStateMachine
|
|
from cic_ussd.validator import check_ip, check_request_content_length, check_service_code, validate_phone_number
|
|
|
|
logging.basicConfig(level=logging.WARNING)
|
|
logg = logging.getLogger()
|
|
|
|
config_directory = '/usr/local/etc/cic-ussd/'
|
|
|
|
# define arguments
|
|
arg_parser = argparse.ArgumentParser()
|
|
arg_parser.add_argument('-c', type=str, default=config_directory, help='config directory.')
|
|
arg_parser.add_argument('-q', type=str, default='cic-ussd', help='queue name for worker tasks')
|
|
arg_parser.add_argument('-v', action='store_true', help='be verbose')
|
|
arg_parser.add_argument('-vv', action='store_true', help='be more verbose')
|
|
arg_parser.add_argument('--env-prefix',
|
|
default=os.environ.get('CONFINI_ENV_PREFIX'),
|
|
dest='env_prefix',
|
|
type=str,
|
|
help='environment prefix for variables to overwrite configuration')
|
|
args = arg_parser.parse_args()
|
|
|
|
# parse config
|
|
config = Config(config_dir=args.c, env_prefix=args.env_prefix)
|
|
config.process()
|
|
config.censor('PASSWORD', 'DATABASE')
|
|
|
|
# define log levels
|
|
if args.vv:
|
|
logging.getLogger().setLevel(logging.DEBUG)
|
|
elif args.v:
|
|
logging.getLogger().setLevel(logging.INFO)
|
|
|
|
# log config vars
|
|
logg.debug(config)
|
|
|
|
# initialize elements
|
|
# set up translations
|
|
i18n.load_path.append(config.get('APP_LOCALE_PATH'))
|
|
i18n.set('fallback', config.get('APP_LOCALE_FALLBACK'))
|
|
|
|
# set Fernet key
|
|
PasswordEncoder.set_key(config.get('APP_PASSWORD_PEPPER'))
|
|
|
|
# create in-memory databases
|
|
ussd_menu_db = create_local_file_data_stores(file_location=config.get('USSD_MENU_FILE'),
|
|
table_name='ussd_menu')
|
|
UssdMenu.ussd_menu_db = ussd_menu_db
|
|
|
|
# set up db
|
|
data_source_name = dsn_from_config(config)
|
|
SessionBase.connect(data_source_name=data_source_name)
|
|
# create session for the life time of http request
|
|
SessionBase.session = SessionBase.create_session()
|
|
|
|
# define universal redis cache access
|
|
InMemoryStore.cache = redis.StrictRedis(host=config.get('REDIS_HOSTNAME'),
|
|
port=config.get('REDIS_PORT'),
|
|
password=config.get('REDIS_PASSWORD'),
|
|
db=config.get('REDIS_DATABASE'),
|
|
decode_responses=True)
|
|
InMemoryUssdSession.redis_cache = InMemoryStore.cache
|
|
|
|
# initialize celery app
|
|
celery.Celery(backend=config.get('CELERY_RESULT_URL'), broker=config.get('CELERY_BROKER_URL'))
|
|
|
|
# load states and transitions data
|
|
states = json_file_parser(filepath=config.get('STATEMACHINE_STATES'))
|
|
transitions = json_file_parser(filepath=config.get('STATEMACHINE_TRANSITIONS'))
|
|
|
|
UssdStateMachine.chain_str = config.get('CIC_CHAIN_SPEC')
|
|
UssdStateMachine.states = states
|
|
UssdStateMachine.transitions = transitions
|
|
|
|
|
|
def application(env, start_response):
|
|
"""Loads python code for application to be accessible over web server
|
|
:param env: Object containing server and request information
|
|
:type env: dict
|
|
:param start_response: Callable to define responses.
|
|
:type start_response: any
|
|
"""
|
|
# define headers
|
|
errors_headers = [('Content-Type', 'text/plain'), ('Content-Length', '0')]
|
|
headers = [('Content-Type', 'text/plain')]
|
|
|
|
if get_request_method(env=env) == 'POST' and get_request_endpoint(env=env) == '/':
|
|
|
|
# get post data
|
|
post_data = json.load(env.get('wsgi.input'))
|
|
|
|
service_code = post_data.get('serviceCode')
|
|
phone_number = post_data.get('phoneNumber')
|
|
external_session_id = post_data.get('sessionId')
|
|
user_input = post_data.get('text')
|
|
|
|
# validate ip address
|
|
if not check_ip(config=config, env=env):
|
|
start_response('403 Sneaky, sneaky', errors_headers)
|
|
return []
|
|
|
|
# validate content length
|
|
if not check_request_content_length(config=config, env=env):
|
|
start_response('400 Size matters', errors_headers)
|
|
return []
|
|
|
|
# validate service code
|
|
if not check_service_code(code=service_code, config=config):
|
|
response = define_multilingual_responses(
|
|
key='ussd.kenya.invalid_service_code',
|
|
locales=['en', 'sw'],
|
|
prefix='END',
|
|
valid_service_code=config.get('APP_SERVICE_CODE'))
|
|
response_bytes, headers = define_response_with_content(headers=errors_headers, response=response)
|
|
start_response('400 Invalid service code', headers)
|
|
return [response_bytes]
|
|
|
|
# validate phone number
|
|
if not validate_phone_number(phone_number):
|
|
start_response('400 Invalid phone number format', errors_headers)
|
|
return []
|
|
|
|
# handle menu interaction requests
|
|
response = process_menu_interaction_requests(chain_str=config.get('CIC_CHAIN_SPEC'),
|
|
external_session_id=external_session_id,
|
|
phone_number=phone_number,
|
|
queue=args.q,
|
|
service_code=service_code,
|
|
user_input=user_input)
|
|
|
|
response_bytes, headers = define_response_with_content(headers=headers, response=response)
|
|
start_response('200 OK,', headers)
|
|
SessionBase.session.close()
|
|
return [response_bytes]
|
|
|
|
# handle pin requests
|
|
if get_request_endpoint(env) == '/pin':
|
|
phone_number = get_query_parameters(env=env, query_name='phoneNumber')
|
|
phone_number = quote_plus(phone_number)
|
|
response, message = process_pin_reset_requests(env=env, phone_number=phone_number)
|
|
response_bytes, headers = define_response_with_content(headers=errors_headers, response=response)
|
|
SessionBase.session.close()
|
|
start_response(message, headers)
|
|
return [response_bytes]
|
|
|
|
# handle requests for locked accounts
|
|
response, message = process_locked_accounts_requests(env=env)
|
|
response_bytes, headers = define_response_with_content(headers=headers, response=response)
|
|
start_response(message, headers)
|
|
SessionBase.session.close()
|
|
return [response_bytes]
|