mailu/fetchmail/fetchmail.py

#!/usr/bin/env python

import sqlite3
import time
import os
import tempfile
import shlex


FETCHMAIL = """
fetchmail -N \
    --sslcertck --sslcertpath /etc/ssl/certs \
    -f {}
"""


RC_LINE = """
poll "{host}" proto {protocol} port {port}
    user "{username}" password "{password}"
    smtphost "smtp"
    smtpname "{user_email}"
    {options}
"""


def escape_rc_string(arg):
    return arg.replace("\\", "\\\\").replace('"', '\\"')


def fetchmail(fetchmailrc):
    print(fetchmailrc)
    with tempfile.NamedTemporaryFile() as handler:
        handler.write(fetchmailrc.encode("utf8"))
        handler.flush()
        os.system(FETCHMAIL.format(shlex.quote(handler.name)))


def run(cursor):
    cursor.execute("""
        SELECT user_email, protocol, host, port, tls, username, password
        FROM fetch
    """)
    fetchmailrc = ""
    for line in cursor.fetchall():
        user_email, protocol, host, port, tls, username, password = line
        options = "options ssl" if tls else ""
        fetchmailrc += RC_LINE.format(
            user_email=escape_rc_string(user_email),
            protocol=protocol,
            host=escape_rc_string(host),
            port=port,
            username=escape_rc_string(username),
            password=escape_rc_string(password),
            options=options
        )
    fetchmail(fetchmailrc)


if __name__ == "__main__":
    db_path = os.environ.get("DB_PATH", "/data/freeposte.db")
    connection = sqlite3.connect(db_path)
    while True:
        time.sleep(int(os.environ.get("FETCHMAIL_DELAY", 10)))
        cursor = connection.cursor()
        run(cursor)
        cursor.close()