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import smtplib
import ssl
import email.utils
import hmac
from email.mime.text import MIMEText
from datetime import datetime
import functools
import json
import binascii
from flask import Flask, request, abort
app = Flask(__name__)
app.config.from_pyfile('config.py')
smtp_server = "smtp.sendgrid.net"
port = 465
mail_routes = {}
def mail_route(name, receiver, subject):
def wrap(func):
global routes
mail_routes[name] = (receiver, subject, func)
return func
return wrap
def authenticate(secret):
def wrap(func):
func.last_seqnum = 0
@functools.wraps(func)
def wrapper(*args, **kwargs):
if not request.is_json:
abort(400)
if not 'auth' in request.json and 'payload' in request.json:
abort(400)
if not isinstance(request.json['auth'], str):
abort(400)
their_digest = binascii.unhexlify(request.json['auth'])
our_digest = hmac.digest(secret.encode('utf-8'), request.json['payload'].encode('utf-8'), 'sha256')
if not hmac.compare_digest(their_digest, our_digest):
abort(403)
try:
payload = json.loads(request.json['payload'])
except:
abort(400)
if not isinstance(payload['seq'], int) or payload['seq'] <= func.last_seqnum:
abort(400)
func.last_seqnum = payload['seq']
del payload['seq']
return func(payload)
return wrapper
return wrap
@mail_route('klingel', 'computerstuff@jaseg.de', 'It rang!')
@authenticate(app.config['SECRET_KLINGEL'])
def klingel(_):
return f'Date: {datetime.utcnow().isoformat()}'
@app.route('/notify/<route_name>', methods=['POST'])
def notify(route_name):
try:
context = ssl.create_default_context()
smtp = smtplib.SMTP_SSL(smtp_server, port)
smtp.login('apikey', app.config['SENDGRID_APIKEY'])
sender = f'{route_name}@{app.config["DOMAIN"]}'
receiver, subject, func = mail_routes[route_name]
msg = MIMEText(func() or subject)
msg['Subject'] = subject
msg['From'] = sender
msg['To'] = receiver
msg['Date'] = email.utils.formatdate()
smtp.sendmail(sender, receiver, msg.as_string())
finally:
smtp.quit()
return 'success'
if __name__ == '__main__':
app.run()
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