mail-addons/mailgun/controllers/main.py

from odoo import http
from odoo.http import request
import re


class MailMailgun(http.Controller):

    @http.route('/mailgun/notify', auth='public', type='http', csrf=False)
    def mailgun_notify(self, **kw):
        # mailgun notification in json format
        message_url = kw.get('message-url')
        if not re.match('^https://[^/]*api.mailgun.net/', message_url):
            # simple security check failed
            raise Exception('wrong message-url')
        request.env['mail.thread'].sudo().mailgun_fetch_message(message_url)
        return 'ok'