mirror of
https://github.com/brmlab/brmdoor_libnfc.git
synced 2025-06-07 16:14:01 +02:00
130 lines
3.6 KiB
Python
Executable file
130 lines
3.6 KiB
Python
Executable file
#!/usr/bin/env python
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import sys
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import logging
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import time
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import ConfigParser
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from binascii import hexlify
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from brmdoor_nfc import NFCDevice, NFCError
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from brmdoor_authenticator import UidAuthenticator
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class BrmdoorConfigError(ConfigParser.Error):
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"""
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Signifies that config has missing or bad values.
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"""
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pass
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class BrmdoorConfig(object):
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"""
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Configuration parser. Holds config variables from config file.
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"""
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_defaults = {
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"lock_opened_secs": "5",
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"unknown_uid_timeout_secs": "5",
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"log_level": "info"
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}
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def __init__(self, filename):
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"""
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Parse and read config from given filename.
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@throws ConfigParser.Error if parsing failed
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@throws BrmdoorConfigError if some value was missing or invalid
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"""
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self.config = ConfigParser.SafeConfigParser(defaults=BrmdoorConfig._defaults)
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self.config.read(filename)
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self.authDbFilename = self.config.get("brmdoor", "auth_db_filename")
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self.lockOpenedSecs = self.config.getint("brmdoor", "lock_opened_secs")
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self.unknownUidTimeoutSecs = self.config.getint("brmdoor", "unknown_uid_timeout_secs")
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self.logFile = self.config.get("brmdoor", "log_file")
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self.logLevel = self.convertLoglevel(self.config.get("brmdoor", "log_level"))
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def convertLoglevel(self, levelString):
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"""Converts string 'debug', 'info', etc. into corresponding
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logging.XXX value which is returned.
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@raises ValueError if the level is undefined
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"""
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try:
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return getattr(logging, levelString.upper())
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except AttributeError:
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raise BrmdoorConfigError("No such loglevel - %s" % levelString)
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class NFCScanner(object):
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"""Thread reading data from NFC reader"""
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def __init__(self, config):
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"""Create worker reading UIDs from PN53x reader.
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"""
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self.authenticator = UidAuthenticator(config.authDbFilename)
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self.unknownUidTimeoutSecs = config.unknownUidTimeoutSecs
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self.lockOpenedSecs = config.lockOpenedSecs
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def run(self):
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"""
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Waits for a card to get into reader field. Reads its UID and
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compares to database of authorized users. Unlocks lock if
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authorized.
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"""
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self.nfc = NFCDevice()
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#self.nfc.pollNr = 0xFF #poll indefinitely
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while True:
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try:
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uid_hex = hexlify(self.nfc.scanUID())
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logging.debug("Got UID %s", uid_hex)
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if len(uid_hex) > 0:
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self.actOnUid(uid_hex)
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else:
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#prevent busy loop if reader goes awry
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time.sleep(0.3)
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except NFCError, e:
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#this exception happens also when scanUID times out
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logging.debug("Failed to wait for RFID card: %s", e)
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except KeyboardInterrupt:
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logging.info("Exiting on keyboard interrupt")
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self.nfc.close()
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self.nfc.unload()
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sys.exit(2)
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except Exception:
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logging.exception("Exception in main unlock thread")
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def actOnUid(self, uid_hex):
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"""
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Do something with the UID scanned. Try to authenticate it against
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database and open lock if authorized.
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"""
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record = self.authenticator.fetchUidRecord(uid_hex)
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#no match
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if record is None:
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logging.info("Unknown UID %s", uid_hex)
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time.sleep(self.unknownUidTimeoutSecs)
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return
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logging.info("Unlocking for UID %s", record)
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time.sleep(self.lockOpenedSecs)
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if __name__ == "__main__":
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if len(sys.argv) < 2:
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print >> sys.stderr, "Syntax: brmdoor_nfc_daemon.py brmdoor_nfc.config"
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sys.exit(1)
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config = BrmdoorConfig(sys.argv[1])
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if config.logFile == "-":
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logging.basicConfig(stream=sys.stderr, level=config.logLevel,
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format="%(asctime)s %(levelname)s %(message)s [%(pathname)s:%(lineno)d]")
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else:
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logging.basicConfig(filename=config.logFile, level=config.logLevel,
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format="%(asctime)s %(levelname)s %(message)s [%(pathname)s:%(lineno)d]")
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nfcUnlocker = NFCUnlocker(config)
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nfcUnlocker.run()
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