401 lines
14 KiB
Python
401 lines
14 KiB
Python
# -*- coding: utf-8 -*-
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""" Email client to forge and send emails """
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import logging
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import os
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import smtplib
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import email.utils
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from email.mime.text import MIMEText
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from email.mime.multipart import MIMEMultipart
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from email.mime.base import MIMEBase
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from email.encoders import encode_base64
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from mako.template import Template as MakoTemplate
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log = logging.getLogger(__name__)
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class EmailClient(object): # pylint: disable=useless-object-inheritance,too-many-instance-attributes
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"""
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Email client
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This class abstract all interactions with the SMTP server.
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"""
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smtp_host = None
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smtp_port = None
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smtp_ssl = None
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smtp_tls = None
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smtp_user = None
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smtp_password = None
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smtp_debug = None
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sender_name = None
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sender_email = None
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catch_all_addr = False
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just_try = False
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encoding = 'utf-8'
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templates = dict()
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def __init__(self, smtp_host=None, smtp_port=None, smtp_ssl=None, smtp_tls=None, smtp_user=None, smtp_password=None, smtp_debug=None,
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sender_name=None, sender_email=None, catch_all_addr=None, just_try=None, encoding=None, templates=None):
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self.smtp_host = smtp_host if smtp_host else 'localhost'
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self.smtp_port = smtp_port if smtp_port else 25
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self.smtp_ssl = bool(smtp_ssl)
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self.smtp_tls = bool(smtp_tls)
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self.smtp_user = smtp_user if smtp_user else None
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self.smtp_password = smtp_password if smtp_password else None
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self.smtp_debug = bool(smtp_debug)
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self.sender_name = sender_name if sender_name else "No reply"
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self.sender_email = sender_email if sender_email else "noreply@localhost"
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self.catch_all_addr = catch_all_addr if catch_all_addr else False
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self.just_try = just_try if just_try else False
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assert templates is None or isinstance(templates, dict)
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self.templates = templates if templates else dict()
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if encoding:
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self.encoding = encoding
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def forge_message(self, rcpt_to, subject=None, html_body=None, text_body=None, attachment_files=None,
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attachment_payloads=None, sender_name=None, sender_email=None, encoding=None,
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template=None, **template_vars): # pylint: disable=too-many-arguments,too-many-locals
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"""
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Forge a message
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:param rcpt_to: The recipient of the email. Could be a tuple(name, email) or just the email of the recipient.
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:param subject: The subject of the email.
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:param html_body: The HTML body of the email
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:param text_body: The plain text body of the email
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:param attachment_files: List of filepaths to attach
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:param attachment_payloads: List of tuples with filename and payload to attach
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:param sender_name: Custom sender name (default: as defined on initialization)
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:param sender_email: Custom sender email (default: as defined on initialization)
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:param encoding: Email content encoding (default: as defined on initialization)
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:param template: The name of a template to use to forge this email
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All other parameters will be consider as template variables.
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"""
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msg = MIMEMultipart('alternative')
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msg['To'] = email.utils.formataddr(rcpt_to) if isinstance(rcpt_to, tuple) else rcpt_to
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msg['From'] = email.utils.formataddr((sender_name or self.sender_name, sender_email or self.sender_email))
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if subject:
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msg['Subject'] = subject.format(**template_vars)
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msg['Date'] = email.utils.formatdate(None, True)
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encoding = encoding if encoding else self.encoding
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if template:
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assert template in self.templates, "Unknwon template %s" % template
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# Handle subject from template
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if not subject:
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assert self.templates[template].get('subject'), 'No subject defined in template %s' % template
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msg['Subject'] = self.templates[template]['subject'].format(**template_vars)
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# Put HTML part in last one to prefered it
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parts = []
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if self.templates[template].get('text'):
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if isinstance(self.templates[template]['text'], MakoTemplate):
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parts.append((self.templates[template]['text'].render(**template_vars), 'plain'))
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else:
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parts.append((self.templates[template]['text'].format(**template_vars), 'plain'))
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if self.templates[template].get('html'):
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if isinstance(self.templates[template]['html'], MakoTemplate):
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parts.append((self.templates[template]['html'].render(**template_vars), 'html'))
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else:
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parts.append((self.templates[template]['html'].format(**template_vars), 'html'))
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for body, mime_type in parts:
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msg.attach(MIMEText(body.encode(encoding), mime_type, _charset=encoding))
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else:
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assert subject, 'No subject provided'
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if text_body:
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msg.attach(MIMEText(text_body.encode(encoding), 'plain', _charset=encoding))
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if html_body:
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msg.attach(MIMEText(html_body.encode(encoding), 'html', _charset=encoding))
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if attachment_files:
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for filepath in attachment_files:
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with open(filepath, 'rb') as fp:
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part = MIMEBase('application', "octet-stream")
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part.set_payload(fp.read())
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encode_base64(part)
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part.add_header('Content-Disposition', 'attachment; filename="%s"' % os.path.basename(filepath))
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msg.attach(part)
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if attachment_payloads:
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for filename, payload in attachment_payloads:
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part = MIMEBase('application', "octet-stream")
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part.set_payload(payload)
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encode_base64(part)
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part.add_header('Content-Disposition', 'attachment; filename="%s"' % filename)
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msg.attach(part)
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return msg
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def send(self, rcpt_to, msg=None, subject=None, just_try=False, **forge_args):
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"""
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Send an email
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:param rcpt_to: The recipient of the email. Could be a tuple(name, email)
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or just the email of the recipient.
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:param msg: The message of this email (as MIMEBase or derivated classes)
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:param subject: The subject of the email (only if the message is not provided
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using msg parameter)
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:param just_try: Enable just try mode (do not really send email, default: as defined on initialization)
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All other parameters will be consider as parameters to forge the message
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(only if the message is not provided using msg parameter).
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"""
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msg = msg if msg else self.forge_message(rcpt_to, subject, **forge_args)
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if just_try or self.just_try:
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log.debug('Just-try mode: do not really send this email to %s (subject="%s")', rcpt_to, subject or msg.get('subject', 'No subject'))
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return True
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if self.catch_all_addr:
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catch_addr = self.catch_all_addr
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log.debug('Catch email originaly send to %s to %s', rcpt_to, catch_addr)
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rcpt_to = catch_addr
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try:
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if self.smtp_ssl:
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logging.info("Establish SSL connection to server %s:%s", self.smtp_host, self.smtp_port)
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server = smtplib.SMTP_SSL(self.smtp_host, self.smtp_port)
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else:
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logging.info("Establish connection to server %s:%s", self.smtp_host, self.smtp_port)
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server = smtplib.SMTP(self.smtp_host, self.smtp_port)
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if self.smtp_tls:
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logging.info('Start TLS on SMTP connection')
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server.starttls()
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except smtplib.SMTPException:
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log.error('Error connecting to SMTP server %s:%s', self.smtp_host, self.smtp_port, exc_info=True)
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return False
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if self.smtp_debug:
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server.set_debuglevel(True)
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if self.smtp_user and self.smtp_password:
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try:
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log.info('Try to authenticate on SMTP connection as %s', self.smtp_user)
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server.login(self.smtp_user, self.smtp_password)
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except smtplib.SMTPException:
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log.error('Error authenticating on SMTP server %s:%s with user %s', self.smtp_host, self.smtp_port, self.smtp_user, exc_info=True)
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return False
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error = False
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try:
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log.info('Sending email to %s', rcpt_to)
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server.sendmail(self.sender_email, [rcpt_to[1] if isinstance(rcpt_to, tuple) else rcpt_to], msg.as_string())
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except smtplib.SMTPException:
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error = True
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log.error('Error sending email to %s', rcpt_to, exc_info=True)
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finally:
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server.quit()
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return not error
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if __name__ == '__main__':
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# Run tests
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import datetime
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import sys
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import argparse
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# Options parser
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parser = argparse.ArgumentParser()
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parser.add_argument(
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'-v', '--verbose',
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action="store_true",
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dest="verbose",
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help="Enable verbose mode"
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)
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parser.add_argument(
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'-d', '--debug',
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action="store_true",
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dest="debug",
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help="Enable debug mode"
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)
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parser.add_argument(
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'-l', '--log-file',
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action="store",
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type=str,
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dest="logfile",
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help="Log file path"
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)
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parser.add_argument(
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'-j', '--just-try',
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action="store_true",
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dest="just_try",
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help="Enable just-try mode"
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)
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email_opts = parser.add_argument_group('Email options')
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email_opts.add_argument(
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'-H', '--smtp-host',
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action="store",
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type=str,
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dest="email_smtp_host",
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help="SMTP host"
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)
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email_opts.add_argument(
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'-P', '--smtp-port',
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action="store",
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type=int,
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dest="email_smtp_port",
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help="SMTP port"
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)
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email_opts.add_argument(
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'-S', '--smtp-ssl',
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action="store_true",
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dest="email_smtp_ssl",
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help="Use SSL"
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)
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email_opts.add_argument(
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'-T', '--smtp-tls',
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action="store_true",
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dest="email_smtp_tls",
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help="Use TLS"
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)
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email_opts.add_argument(
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'-u', '--smtp-user',
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action="store",
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type=str,
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dest="email_smtp_user",
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help="SMTP username"
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)
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email_opts.add_argument(
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'-p', '--smtp-password',
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action="store",
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type=str,
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dest="email_smtp_password",
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help="SMTP password"
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)
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email_opts.add_argument(
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'-D', '--smtp-debug',
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action="store_true",
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dest="email_smtp_debug",
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help="Debug SMTP connection"
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)
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email_opts.add_argument(
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'-e', '--email-encoding',
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action="store",
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type=str,
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dest="email_encoding",
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help="SMTP encoding"
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)
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email_opts.add_argument(
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'-f', '--sender-name',
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action="store",
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type=str,
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dest="email_sender_name",
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help="Sender name"
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)
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email_opts.add_argument(
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'-F', '--sender-email',
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action="store",
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type=str,
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dest="email_sender_email",
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help="Sender email"
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)
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email_opts.add_argument(
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'-C', '--catch-all',
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action="store",
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type=str,
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dest="email_catch_all",
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help="Catch all sent email: specify catch recipient email address"
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)
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test_opts = parser.add_argument_group('Test email options')
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test_opts.add_argument(
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'-t', '--to',
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action="store",
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type=str,
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dest="test_to",
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help="Test email recipient",
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)
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test_opts.add_argument(
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'-m', '--mako',
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action="store_true",
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dest="test_mako",
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help="Test mako templating",
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)
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options = parser.parse_args()
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if not options.test_to:
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parser.error('You must specify test email recipient using -t/--to parameter')
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sys.exit(1)
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# Initialize logs
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logformat = '%(asctime)s - Test EmailClient - %(levelname)s - %(message)s'
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if options.debug:
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loglevel = logging.DEBUG
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elif options.verbose:
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loglevel = logging.INFO
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else:
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loglevel = logging.WARNING
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if options.logfile:
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logging.basicConfig(filename=options.logfile, level=loglevel, format=logformat)
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else:
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logging.basicConfig(level=loglevel, format=logformat)
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if options.email_smtp_user and not options.email_smtp_password:
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import getpass
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options.email_smtp_password = getpass.getpass('Please enter SMTP password: ')
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logging.info('Initialize Email client')
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email_client = EmailClient(
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smtp_host=options.email_smtp_host,
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smtp_port=options.email_smtp_port,
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smtp_ssl=options.email_smtp_ssl,
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smtp_tls=options.email_smtp_tls,
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smtp_user=options.email_smtp_user,
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smtp_password=options.email_smtp_password,
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smtp_debug=options.email_smtp_debug,
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sender_name=options.email_sender_name,
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sender_email=options.email_sender_email,
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catch_all_addr=options.email_catch_all,
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just_try=options.just_try,
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encoding=options.email_encoding,
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templates=dict(
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test=dict(
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subject="Test email",
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text=(
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"Just a test email sent at {sent_date}." if not options.test_mako else
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MakoTemplate("Just a test email sent at ${sent_date}.")
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),
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html=(
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"<strong>Just a test email.</strong> <small>(sent at {sent_date})</small>" if not options.test_mako else
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MakoTemplate("<strong>Just a test email.</strong> <small>(sent at ${sent_date})</small>")
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)
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)
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)
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)
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logging.info('Send a test email to %s', options.test_to)
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if email_client.send(options.test_to, template='test', sent_date=datetime.datetime.now()):
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logging.info('Test email sent')
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sys.exit(0)
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logging.error('Fail to send test email')
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sys.exit(1)
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