app.py

from os import environ as env
from chalice import Chalice, Response
from twilio.rest import Client
from twilio.base.exceptions import TwilioRestException

#Twilio Config
ACCOUNT_SID = env.get('ACCOUNT_SID')
AUTH_TOKEN = env.get('AUTH_TOKEN')
FROM_NUMBER = env.get('FROM_NUMBER')
TO_NUMBER =env.get('TO_NUMBER')

app = Chalice(app_name='sms-trigger')

# Create a Twilio client using account_sid and auth token
tw_client = Client(ACCOUNT_SID, AUTH_TOKEN)


@app.route('/service/sms/send', methods=['POST'])
def send_sms():
    request_body = app.current_request.json_body
    if request_body:
        try:
            msg = tw_client.message.create(
            from_ = FROM_NUMBER,
            body = request_body['msg'],
            to = TO_NUMBER)

            if msg.sid:
                return Response(status_code=200,
                                headers={'content-type':'application/json'},
                                body={'status':'success', 'data':msg.sid, 'message':'SMS successfully sent'})
            else:
                return Response(status_code=201,
                                headers={'content-type':'application/json'},
                                body={'status':'failure','message':'Please try again'})
        except TwilioRestException as exc:
            return Response(status_code=400,
                            headers={'content-type':'application/json'},
                            body={'status':'failure',
                                  'message':exc.msg})