from flask import Flask, request
from flask.json import jsonify

from google.appengine.api import mail

app = Flask(__name__)

# define API endpoint /send
@app.route('/send', methods=['POST']) #GET requests will be blocked
def send():
    req_data = request.get_json()
    sender_address = req_data['from']
    to = req_data['to']
    subject = req_data['subject']
    body = req_data['html']
    mail.send_mail(sender=sender_address, to=to, subject=subject, body='', html=body)
    return 'Email sent.',200