123 lines
4.8 KiB
Python
123 lines
4.8 KiB
Python
"""SMTP email backend class."""
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import smtplib
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import ssl
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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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from django.core.mail.message import sanitize_address
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from django.utils.encoding import force_bytes
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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, use_ssl=None, timeout=None,
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**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 = settings.EMAIL_HOST_USER if username is None else username
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self.password = settings.EMAIL_HOST_PASSWORD if password is None else password
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self.use_tls = settings.EMAIL_USE_TLS if use_tls is None else use_tls
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self.use_ssl = settings.EMAIL_USE_SSL if use_ssl is None else use_ssl
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self.timeout = timeout
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if self.use_ssl and self.use_tls:
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raise ValueError(
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"EMAIL_USE_TLS/EMAIL_USE_SSL are mutually exclusive, so only set "
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"one of those settings to True.")
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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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connection_class = smtplib.SMTP_SSL if self.use_ssl else smtplib.SMTP
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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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connection_params = {'local_hostname': DNS_NAME.get_fqdn()}
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if self.timeout is not None:
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connection_params['timeout'] = self.timeout
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try:
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self.connection = connection_class(self.host, self.port, **connection_params)
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# TLS/SSL are mutually exclusive, so only attempt TLS over
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# non-secure connections.
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if not self.use_ssl and 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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except smtplib.SMTPException:
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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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if self.connection is None:
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return
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try:
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try:
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self.connection.quit()
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except (ssl.SSLError, smtplib.SMTPServerDisconnected):
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# This happens when calling quit() on a TLS connection
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# sometimes, or when the connection was already disconnected
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# by the server.
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self.connection.close()
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except smtplib.SMTPException:
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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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with self._lock:
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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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return num_sent
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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 = sanitize_address(email_message.from_email, email_message.encoding)
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recipients = [sanitize_address(addr, email_message.encoding)
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for addr in email_message.recipients()]
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message = email_message.message()
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charset = message.get_charset().get_output_charset() if message.get_charset() else 'utf-8'
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try:
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self.connection.sendmail(from_email, recipients,
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force_bytes(message.as_string(), charset))
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except smtplib.SMTPException:
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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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