113 lines
3.8 KiB
Python
113 lines
3.8 KiB
Python
"""SMTP email backend class."""
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import smtplib
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import socket
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import threading
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from django.conf import settings
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from django.core.mail.backends.base import BaseEmailBackend
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from django.core.mail.utils import DNS_NAME
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class EmailBackend(BaseEmailBackend):
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"""
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A wrapper that manages the SMTP network connection.
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"""
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def __init__(self, host=None, port=None, username=None, password=None,
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use_tls=None, fail_silently=False, **kwargs):
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super(EmailBackend, self).__init__(fail_silently=fail_silently)
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self.host = host or settings.EMAIL_HOST
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self.port = port or settings.EMAIL_PORT
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self.username = username or settings.EMAIL_HOST_USER
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self.password = password or settings.EMAIL_HOST_PASSWORD
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if use_tls is None:
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self.use_tls = settings.EMAIL_USE_TLS
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else:
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self.use_tls = use_tls
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self.connection = None
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self._lock = threading.RLock()
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def open(self):
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"""
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Ensures we have a connection to the email server. Returns whether or
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not a new connection was required (True or False).
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"""
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if self.connection:
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# Nothing to do if the connection is already open.
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return False
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try:
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# If local_hostname is not specified, socket.getfqdn() gets used.
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# For performance, we use the cached FQDN for local_hostname.
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self.connection = smtplib.SMTP(self.host, self.port,
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local_hostname=DNS_NAME.get_fqdn())
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if self.use_tls:
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self.connection.ehlo()
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self.connection.starttls()
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self.connection.ehlo()
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if self.username and self.password:
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self.connection.login(self.username, self.password)
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return True
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except:
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if not self.fail_silently:
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raise
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def close(self):
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"""Closes the connection to the email server."""
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try:
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try:
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self.connection.quit()
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except socket.sslerror:
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# This happens when calling quit() on a TLS connection
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# sometimes.
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self.connection.close()
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except:
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if self.fail_silently:
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return
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raise
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finally:
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self.connection = None
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def send_messages(self, email_messages):
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"""
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Sends one or more EmailMessage objects and returns the number of email
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messages sent.
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"""
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if not email_messages:
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return
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self._lock.acquire()
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try:
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new_conn_created = self.open()
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if not self.connection:
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# We failed silently on open().
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# Trying to send would be pointless.
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return
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num_sent = 0
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for message in email_messages:
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sent = self._send(message)
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if sent:
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num_sent += 1
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if new_conn_created:
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self.close()
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finally:
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self._lock.release()
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return num_sent
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def _sanitize(self, email):
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name, domain = email.split('@', 1)
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email = '@'.join([name, domain.encode('idna')])
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return email
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def _send(self, email_message):
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"""A helper method that does the actual sending."""
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if not email_message.recipients():
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return False
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from_email = self._sanitize(email_message.from_email)
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recipients = map(self._sanitize, email_message.recipients())
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try:
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self.connection.sendmail(from_email, recipients,
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email_message.message().as_string())
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except:
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if not self.fail_silently:
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raise
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return False
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return True
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