112 lines
4 KiB
Python
112 lines
4 KiB
Python
import logging
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import smtplib
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from smtplib import SMTPAuthenticationError
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from decouple import config
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from fastapi import HTTPException
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class EmptySMTP:
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def sendmail(self, from_addr, to_addrs, msg, mail_options=(), rcpt_options=()):
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logging.error("!! CANNOT SEND EMAIL, NO VALID SMTP CONFIGURATION FOUND")
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def send_message(self, msg):
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self.sendmail( msg["FROM"], msg["TO"], msg.as_string() )
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class SMTPClient:
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server = None
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def __init__(self):
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if config("EMAIL_HOST") is None or len(config("EMAIL_HOST")) == 0:
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return
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elif not config("EMAIL_USE_SSL", cast=bool):
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self.server = smtplib.SMTP(host=config("EMAIL_HOST"), port=config("EMAIL_PORT", cast=int))
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else:
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if len(config("EMAIL_SSL_KEY")) == 0 or len(config("EMAIL_SSL_CERT")) == 0:
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self.server = smtplib.SMTP_SSL(host=config("EMAIL_HOST"), port=config("EMAIL_PORT", cast=int))
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else:
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self.server = smtplib.SMTP_SSL(host=config("EMAIL_HOST"), port=config("EMAIL_PORT", cast=int),
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keyfile=config("EMAIL_SSL_KEY"), certfile=config("EMAIL_SSL_CERT"))
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def __enter__(self):
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if self.server is None:
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return EmptySMTP()
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self.server.ehlo()
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if not config("EMAIL_USE_SSL", cast=bool) and config("EMAIL_USE_TLS", cast=bool):
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self.server.starttls()
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# stmplib docs recommend calling ehlo() before & after starttls()
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self.server.ehlo()
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if len(config("EMAIL_USER", default="")) > 0 and len(config("EMAIL_PASSWORD", default="")) > 0:
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try:
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self.server.login(user=config("EMAIL_USER"), password=config("EMAIL_PASSWORD"))
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except SMTPAuthenticationError:
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raise HTTPException(401, "SMTP Authentication Error")
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return self.server
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def __exit__(self, *args):
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if self.server is None:
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return
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self.server.quit()
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def test_configuration(self):
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# check server connexion
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try:
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status = self.server.noop()[0]
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if not (status == 250):
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raise Exception(f"SMTP connexion error, status:{status}")
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except Exception as e: # smtplib.SMTPServerDisconnected
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logging.error(
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f'!! SMTP connexion error to {config("EMAIL_HOST")}:{config("EMAIL_PORT", cast=int)}')
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logging.error(e)
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return False, e
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# check authentication
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try:
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self.__enter__()
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self.__exit__()
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except Exception as e:
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logging.error(f'!! SMTP authentication error to {config("EMAIL_HOST")}:{config("EMAIL_PORT", cast=int)}')
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logging.error(e)
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return False, e
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return True, None
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VALID_SMTP = None
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SMTP_ERROR = None
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SMTP_NOTIFIED = False
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def has_smtp():
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global VALID_SMTP, SMTP_ERROR, SMTP_NOTIFIED
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if SMTP_ERROR is not None:
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logging.error("!!! SMTP error found, disabling SMTP configuration:")
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logging.error(SMTP_ERROR)
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if VALID_SMTP is not None:
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return VALID_SMTP
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if config("EMAIL_HOST") is not None and len(config("EMAIL_HOST")) > 0:
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VALID_SMTP, SMTP_ERROR = check_connexion()
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return VALID_SMTP
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elif not SMTP_NOTIFIED:
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SMTP_NOTIFIED = True
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logging.info("no SMTP configuration found")
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return False
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def check_connexion():
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# check SMTP host&port
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import socket
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sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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sock.settimeout(config("EMAIL_CHECK_TIMEOUT", cast=int, default=5))
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result = sock.connect_ex((config("EMAIL_HOST"), config("EMAIL_PORT", cast=int)))
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sock.close()
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if not (result == 0):
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error = f"""!! SMTP {config("EMAIL_HOST")}:{config("EMAIL_PORT", cast=int)} is unreachable
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f'please make sure the host&port are correct, and the SMTP protocol is authorized on your server."""
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logging.error(error)
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sock.close()
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return False, error
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return SMTPClient().test_configuration()
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