utils.py

import pytz
from datetime import datetime
from O365 import Account
import json
import smtplib
from email.mime.text import MIMEText

with open('config.json') as f:
    config = json.load(f)

TZ = pytz.timezone(config['TIMEZONE'])

def now_arg():
    return datetime.now(TZ)

def today_str():
    return now_arg().strftime('%Y-%m-%d')

def is_weekday():
    return now_arg().weekday() < 5

def send_mail(subject, body):
    sender = config['EXCHANGE_SENDER']
    recipients = [r.strip() for r in config['EXCHANGE_RECIPIENT'].split(',')]
    if sender.endswith('@gmail.com'):
        # Enviar por Gmail SMTP
        password = config.get('GMAIL_APP_PASSWORD', None)
        if not password:
            raise Exception('Falta GMAIL_APP_PASSWORD en config.json')
        msg = MIMEText(body, 'plain', 'utf-8')
        msg['Subject'] = subject
        msg['From'] = sender
        msg['To'] = ', '.join(recipients)
        with smtplib.SMTP_SSL('smtp.gmail.com', 465) as server:
            server.login(sender, password)
            server.sendmail(sender, recipients, msg.as_string())
    else:
        # Enviar por Microsoft Exchange (O365)
        credentials = (config['EXCHANGE_CLIENT_ID'], config['EXCHANGE_CLIENT_SECRET'])
        account = Account(credentials, tenant_id=config['EXCHANGE_TENANT_ID'])
        if not account.is_authenticated:
            account.authenticate(scopes=['basic', 'message_all'])
        m = account.new_message()
        for r in recipients:
            m.to.add(r)
        m.subject = subject
        m.body = body
        m.sender.address = sender
        m.send()