130 lines
5.2 KiB
Python
130 lines
5.2 KiB
Python
import select
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import socket
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import time
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import datetime
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from threading import Lock, RLock, Condition, Thread
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from typing import Callable, Optional, IO, Container
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from . import mqtt, util
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from .util import timestamp
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class DoorControlNfc(util.Loggable):
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"""Validates tokens read from a socket and tells a DoorControl to toggle its target"""
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def __init__(self, config, control, mqtt_client = None):
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super().__init__("nfc")
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self._config = config
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self._nfc = self._open_nfc_fifo()
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self._control = control
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self._stop = True
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self._mutex = RLock()
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self._cond = Condition(self._mutex)
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self._fifo = None
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self._mqttc = mqtt_client
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self._read_valid_tokens()
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self.last_invalid_token = mqtt.Value(self._mqttc,
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"door/token/last_invalid", persistent=True)
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def _open_nfc_fifo(self) -> IO:
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"""Opens config.nfc_fifo as the FIFO through which detected tokens are passed in."""
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self._logger().debug(f"Opening FIFO {self._config.nfc_fifo}")
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return open(self._config.nfc_fifo, "r")
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def _read_valid_tokens(self) -> Container:
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"""Refreshes all tokens from config.valid_tokens"""
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with self._mutex:
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valid = {}
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try:
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self._logger().info("Loading tokens")
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lines =[ s.strip() for s in open(self._config.valid_tokens, "r").readlines() ]
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for i, line in enumerate(lines):
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l = line.split('|')
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if len(l) == 5:
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if not l[0].strip().startswith('#'):
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token, name, organization, email, valid_thru = l
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try:
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if len(valid_thru.strip()) > 0:
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valid_thru = datetime.date.fromisoformat(valid_thru)
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else:
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valid_thru = None
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except Exception:
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self._logger().exception(f"Could not parse valid thru date {valid_thru} for token {token} in line {i+1}")
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valid_thru = None
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self._logger().debug(f"Got token {token} associated with {name} <{email}> of {organization}, valid thru {valid_thru}")
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if token in valid:
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self._logger().warning(f"Overwriting token {token}")
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valid[token] = {
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'name': name,
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'organization': organization,
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'email': email,
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'valid_thru': valid_thru
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}
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else:
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self._logger().warning(f"Skipping line {i} ({line}) since it does not contain exactly 5 data field")
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except Exception as e:
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valid = {}
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self._logger().error(f"Error reading token file. Exception: {e}")
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self._tokens = valid
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def _run(self):
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with self._cond:
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while not self._stop:
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if not self._fifo:
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self._read_valid_tokens()
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self._fifo = self._open_nfc_fifo()
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if not self._fifo:
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time.sleep(5)
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continue
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self._cond.release()
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readable, _, _ = select.select(
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[self._fifo],
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[], [], 1)
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self._cond.acquire()
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if self._fifo in readable:
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token = self._fifo.readline().strip()
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if token == "":
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self._fifo = None
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continue
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self._logger().debug(f"Token from nfc_fifo: {token}")
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self.handle_token(token)
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def handle_token(self, token):
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with self._mutex:
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if token in self._tokens:
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data = self._tokens[token]
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if data['valid_thru'] is not None:
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# if a valid thru date has been set we check if the token is still valid
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authorized = datetime.date.today() <= data['valid_thru']
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else:
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# otherwise we don't need to check
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authorized = True
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if authorized:
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self._logger().info(f"Valid token {token} of {data['name']}")
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self._control.toggle()
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else:
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self._logger().warning(f"Token {token} of {data['name']} expired on {data['valid_thru']}")
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else:
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self._logger().warning(f"Invalid token: {token}")
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self.last_invalid_token(f"{timestamp()};{token}")
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def start(self):
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with self._mutex:
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if self._stop:
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self._stop = False
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self._task = Thread(target=self._run, daemon=True)
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self._task.start()
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print("Done")
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def stop(self):
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with self._cond:
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if not self._stop:
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self._stop = True
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self._cond.notify()
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self._task.join()
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