python-smtp-send-file.py

import smtplib
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart
from email.mime.application import MIMEApplication
import json
import os
import getpass
from typing import List, Tuple, Dict

EMAIL_SUBJECT = 'Notification of DM'
EMAIL_SENDER_DESC = 'NotificationBot'
EMAIL_HOST = 'mail.example.com'
EMAIL_SENDER_ACCOUNT = 'sender@example.com'
EMAIL_SENDER_SECRET = getpass.getpass('Input the password of your email account: ')

def send_email(server: smtplib.SMTPException,
               content: str, 
               files_list: List[Tuple[str]], 
               destinations: str):
    toaddrs = destinations
    textpart = MIMEText(content)

    m = MIMEMultipart()
    m.attach(textpart)
    for file in files_list:
        filepart = MIMEApplication(file[1]) # file[1] The binary content of file
        filepart.add_header('Content-Disposition',
                            'attachment', filename=file[0]) # file[0] The name of file
        m.attach(filepart)
    m['Subject'] = EMAIL_SUBJECT
    m['From'] = EMAIL_SENDER_DESC
    m['To'] = "".join([f"<{dest}>" for dest in destinations])

    try:
        server.sendmail(EMAIL_SENDER_ACCOUNT, toaddrs, m.as_string())
        print('success')
        return True
    except smtplib.SMTPException as err:
        print('error:', err)  # Log error
        return False
    
def get_server(email_host: str, account: str, secret: str):
    server = smtplib.SMTP(email_host)
    server.login(account, secret)
    return server

def del_server(server: smtplib.SMTP):
    server.quit()

def get_job():
    """Rewrite this function to generate new jobs

    Returns:
        A list of tuples with 'destination' and 'file' as key
    """
    return [{ "destination": 'receiver@example.com', 
             "file": './python-smtp-send-file.py'}]

def main():
    server = get_server(EMAIL_HOST, EMAIL_SENDER_ACCOUNT, EMAIL_SENDER_SECRET)
    jobs = get_job()
    
    for job in jobs:
        filename = os.path.basename(job['file'])
        filecontent = open(job['file'], 'rb').read()
        send_email(server, 'helloworld', [(filename, filecontent)], job['destination'])

    del_server(server)

main()