opensmtpd table plugin which supports regex in emails for alias lookups

opensmtpd_filter_userwildcard.py

# Install table-python to /usr/libexec/opensmtpd (https://github.com/OpenSMTPD/OpenSMTPD-extras)
# create file /etc/aliases with entires like
#  mail-.*@domain.com: username
# use python table in opensmtpd.conf, example for vusers:
#  table aliases python:/path/to/opensmtpd_filter_userwildcard.py
#  table userinfo file:/etc/opensmtpd/users
#  accept from any for domain domain.com virtual <aliases> userbase <userinfo> deliver to lmtp 127.0.0.1:2
#
# Debug:
#  comment out 'from table import *' and comment in last two lines, run with python
#  run opensmtpd with smtpd -vd
#  after starting opensmtpd, try 'smtpctl trace lookup' and look in /var/log/maillog

from table import *
import re

def table_update():
  return

def table_check(service, dict, key):
  return

def table_lookup(service, dict, key):
  if (service != K_ALIAS):
    return
  for line in open("/etc/aliases"):
    if line.startswith("#"):
      continue
    if not line.strip():
      continue
    (mail, alias) = line.split(':', 2)
    if re.match(mail, key):
      return alias.strip()
  return
 
def table_fetch(service, dict):
  return

#K_ALIAS=1
#print table_lookup(K_ALIAS, {}, "mail-.*@domain.com")