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emailer.py
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emailer.py
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# Copyright 2022 Secureworks
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import smtplib
import logging
from configparser import ConfigParser
from email.message import EmailMessage
class Emailer:
"""Class to send emails"""
def __init__(self, config: ConfigParser):
"""Initialize emailer
:param config: configuration settings
"""
self.smtp_server = config.get("DEFAULT", "SMTP_SERVER")
self.smtp_port = config.get("DEFAULT", "SMTP_PORT")
self.smtp_proto = config.get("DEFAULT", "SMTP_PROTO")
self.smtp_email = config.get("DEFAULT", "SMTP_EMAIL")
self.smtp_password = config.get("DEFAULT", "SMTP_PASSWORD")
def send_email(self, message: EmailMessage) -> bool:
"""Send a given email message
:param message: email message object to send
:returns: bool if email sent successfully
"""
# Notify the user of no credentials
if not (self.smtp_email or self.smtp_password):
logging.debug("No credentials provided, skipping SMTP authentication")
# Attempt to send the email over SSL, TLS, or no encryption via SMTP
try:
if self.smtp_proto.lower() == "ssl":
with smtplib.SMTP_SSL(self.smtp_server, self.smtp_port) as smtp:
if self.smtp_email or self.smtp_password:
smtp.login(self.smtp_email, self.smtp_password)
smtp.send_message(message)
elif self.smtp_proto.lower() == "tls":
with smtplib.SMTP(self.smtp_server, self.smtp_port) as smtp:
smtp.ehlo()
smtp.starttls()
if self.smtp_email or self.smtp_password:
smtp.login(self.smtp_email, self.smtp_password)
smtp.send_message(message)
elif not self.smtp_proto:
with smtplib.SMTP(self.smtp_server, self.smtp_port) as smtp:
if self.smtp_email or self.smtp_password:
smtp.login(self.smtp_email, self.smtp_password)
smtp.send_message(message)
# Catch invalid protocols
else:
raise ValueError(f"Invalid SMTP protocol: {self.smtp_proto}")
return True
except Exception as e:
logging.error(f"Failed to send email: {e}")
return False