455 lines
16 KiB
Python
455 lines
16 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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from mylib.config import ConfigurableObject
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from mylib.config import BooleanOption
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from mylib.config import IntegerOption
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from mylib.config import PasswordOption
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from mylib.config import StringOption
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log = logging.getLogger(__name__)
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class EmailClient(ConfigurableObject): # 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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_config_name = 'email'
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_config_comment = 'Email'
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_defaults = {
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'smtp_host': 'localhost',
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'smtp_port': 25,
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'smtp_ssl': False,
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'smtp_tls': False,
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'smtp_user': None,
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'smtp_password': None,
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'smtp_debug': False,
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'sender_name': 'No reply',
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'sender_email': 'noreply@localhost',
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'encoding': 'utf-8',
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'catch_all_addr': None,
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'just_try': False,
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}
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templates = dict()
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def __init__(self, templates=None, **kwargs):
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super().__init__(**kwargs)
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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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def configure(self, use_smtp=True, just_try=True, ** kwargs): # pylint: disable=arguments-differ
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""" Configure options on registered mylib.Config object """
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section = super().configure(**kwargs)
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if use_smtp:
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section.add_option(
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StringOption, 'smtp_host', default=self._defaults['smtp_host'],
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comment='SMTP server hostname/IP address')
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section.add_option(
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IntegerOption, 'smtp_port', default=self._defaults['smtp_port'],
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comment='SMTP server port')
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section.add_option(
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BooleanOption, 'smtp_ssl', default=self._defaults['smtp_ssl'],
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comment='Use SSL on SMTP server connection')
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section.add_option(
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BooleanOption, 'smtp_tls', default=self._defaults['smtp_tls'],
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comment='Use TLS on SMTP server connection')
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section.add_option(
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StringOption, 'smtp_user', default=self._defaults['smtp_user'],
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comment='SMTP authentication username')
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section.add_option(
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PasswordOption, 'smtp_password', default=self._defaults['smtp_password'],
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comment='SMTP authentication password (set to "keyring" to use XDG keyring)',
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username_option='smtp_user', keyring_value='keyring')
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section.add_option(
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BooleanOption, 'smtp_debug', default=self._defaults['smtp_debug'],
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comment='Enable SMTP debugging')
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section.add_option(
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StringOption, 'sender_name', default=self._defaults['sender_name'],
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comment='Sender name')
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section.add_option(
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StringOption, 'sender_email', default=self._defaults['sender_email'],
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comment='Sender email address')
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section.add_option(
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StringOption, 'encoding', default=self._defaults['encoding'],
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comment='Email encoding')
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section.add_option(
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StringOption, 'catch_all_addr', default=self._defaults['catch_all_addr'],
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comment='Catch all sent emails to this specified email address')
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if just_try:
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section.add_option(
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BooleanOption, 'just_try', default=self._defaults['just_try'],
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comment='Just-try mode: do not really send emails')
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return section
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def forge_message(self, rcpt_to, subject=None, html_body=None, text_body=None, # pylint: disable=too-many-arguments,too-many-locals
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attachment_files=None, attachment_payloads=None, sender_name=None,
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sender_email=None, encoding=None, template=None, **template_vars):
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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(
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(
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sender_name or self._get_option('sender_name'),
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sender_email or self._get_option('sender_email')
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)
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)
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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._get_option('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._get_option('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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catch_addr = self._get_option('catch_all_addr')
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if catch_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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smtp_host = self._get_option('smtp_host')
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smtp_port = self._get_option('smtp_port')
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try:
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if self._get_option('smtp_ssl'):
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logging.info("Establish SSL connection to server %s:%s", smtp_host, smtp_port)
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server = smtplib.SMTP_SSL(smtp_host, smtp_port)
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else:
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logging.info("Establish connection to server %s:%s", smtp_host, smtp_port)
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server = smtplib.SMTP(smtp_host, smtp_port)
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if self._get_option('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', smtp_host, smtp_port, exc_info=True)
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return False
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if self._get_option('smtp_debug'):
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server.set_debuglevel(True)
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smtp_user = self._get_option('smtp_user')
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smtp_password = self._get_option('smtp_password')
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if smtp_user and smtp_password:
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try:
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log.info('Try to authenticate on SMTP connection as %s', smtp_user)
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server.login(smtp_user, smtp_password)
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except smtplib.SMTPException:
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log.error(
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'Error authenticating on SMTP server %s:%s with user %s',
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smtp_host, smtp_port, 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(
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self._get_option('sender_email'),
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[rcpt_to[1] if isinstance(rcpt_to, tuple) else rcpt_to],
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msg.as_string()
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)
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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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