Custom Mailer

mail.py

import smtplib
from email.message import EmailMessage
from flask import g, current_app


class Mailer():
    def __init__(self, smtp_host=None, smtp_port=None, username=None,
                 password=None):
        self._smtp_host = smtp_host
        self._smtp_port = smtp_port
        self._username = username
        self._password = password

    def send(self, subject, to, sender, msg_plain, msg_html=None, headers={}):
        msg = EmailMessage()
        msg.set_content(msg_plain)
        msg.add_alternative(msg_html, subtype='html')
        msg['Subject'] = subject
        msg['From'] = sender
        msg['To'] = to

        for k, v in headers.items():
            msg.add_header(k, v)

        server = smtplib.SMTP_SSL(self._smtp_host, self._smtp_port)
        server.ehlo()
        server.login(self._username, self._password)
        server.send_message(msg)
        server.close()


def get_mailer():
    if 'mailer' not in g:
        mailer = Mailer(
            smtp_host=current_app.config.get('MAIL_SMTP_HOST'),
            smtp_port=current_app.config.get('MAIL_SMTP_PORT'),
            username=current_app.config.get('MAIL_USERNAME'),
            password=current_app.config.get('MAIL_PASSWORD')
        )
        g.mailer = mailer
    return g.mailer