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mailu/optional/fetchmail/fetchmail.py

96 lines
2.9 KiB
Python

#!/usr/bin/python3
import time
import os
import tempfile
import shlex
import subprocess
import re
import requests
import sys
FETCHMAIL = """
fetchmail -N \
--sslcertck --sslcertpath /etc/ssl/certs \
-f {}
"""
RC_LINE = """
poll "{host}" proto {protocol} port {port}
user "{username}" password "{password}"
is "{user_email}"
smtphost "{smtphost}"
{options}
"""
def extract_host_port(host_and_port, default_port):
host, _, port = re.match('^(.*)(:([0-9]*))?$', host_and_port).groups()
return host, int(port) if port else default_port
def escape_rc_string(arg):
return "".join("\\x%2x" % ord(char) for char in arg)
def fetchmail(fetchmailrc):
with tempfile.NamedTemporaryFile() as handler:
handler.write(fetchmailrc.encode("utf8"))
handler.flush()
command = FETCHMAIL.format(shlex.quote(handler.name))
output = subprocess.check_output(command, shell=True)
return output
def run(debug):
fetches = requests.get("http://admin/internal/fetch").json()
smtphost, smtpport = extract_host_port(os.environ.get("HOST_SMTP", "smtp"), None)
if smtpport is None:
smtphostport = smtphost
else:
smtphostport = "%s/%d" % (smtphost, smtpport)
for fetch in fetches:
fetchmailrc = ""
options = "options antispam 501, 504, 550, 553, 554"
options += " sslmode wrapped" if fetch["tls"] else ""
options += " keep" if fetch["keep"] else " fetchall"
fetchmailrc += RC_LINE.format(
user_email=escape_rc_string(fetch["user_email"]),
protocol=fetch["protocol"],
host=escape_rc_string(fetch["host"]),
port=fetch["port"],
smtphost=smtphostport,
username=escape_rc_string(fetch["username"]),
password=escape_rc_string(fetch["password"]),
options=options
)
if debug:
print(fetchmailrc)
try:
print(fetchmail(fetchmailrc))
error_message = ""
except subprocess.CalledProcessError as error:
error_message = error.output.decode("utf8")
# No mail is not an error
if not error_message.startswith("fetchmail: No mail"):
print(error_message)
user_info = "for %s at %s" % (fetch["user_email"], fetch["host"])
# Number of messages seen is not a error as well
if ("messages" in error_message and
"(seen " in error_message and
user_info in error_message):
print(error_message)
finally:
requests.post("http://admin/internal/fetch/{}".format(fetch["id"]),
json=error_message.split("\n")[0]
)
if __name__ == "__main__":
while True:
time.sleep(int(os.environ.get("FETCHMAIL_DELAY", 60)))
run(os.environ.get("DEBUG", None) == "True")
sys.stdout.flush()