main.py

#!/usr/bin/python

"""This is a lambda function that accepts web hooks from UptimeRobot
and translates them into SMS messages. Useful when you don't want to
pay UptimeRobot's highway robbery SMS fees.
Twilio code liberally lifted from their blog post on Lambda."""

import os
import json
from twilio.rest import Client

TWILIO_SMS_URL = "https://api.twilio.com/2010-04-01/Accounts/{}/Messages.json"
TWILIO_ACCOUNT_SID = os.environ.get("TWILIO_ACCOUNT_SID")
TWILIO_AUTH_TOKEN = os.environ.get("TWILIO_AUTH_TOKEN")

TWILIO_FROM_NUMBER = ""

def sms_handler(to_number, sms_body):
    """Takes a to number and body and sends it via the Twilio SMS API."""

    if not TWILIO_ACCOUNT_SID:
        return "Unable to access Twilio Account SID."
    elif not TWILIO_AUTH_TOKEN:
        return "Unable to access Twilio Auth Token."
    elif not TWILIO_FROM_NUMBER:
        return "No from phone number provided."
    elif not to_number:
        return "No recipient phone number provided."
    elif not sms_body:
        return "No message body provided."

    sms_client = Client(TWILIO_ACCOUNT_SID, TWILIO_AUTH_TOKEN)

    message = sms_client.messages.create(
        to=to_number,
        from_=TWILIO_FROM_NUMBER,
        body=sms_body)

    return message.sid

#pylint: disable=unused-argument
def lambda_handler(event, context):
    """Takes a dict of info from the web hook and logics it
    into individual notifications."""

    # uncomment next line for debug
    # to_number = "+1"

    event_body = json.loads(event['body'])
    if event_body['alertType'] == "1":
        site_status = "DOWN"
    else:
        site_status = "UP"

    sms_body = "UPTIME ROBOT: %s is %s on alert checker %s. (Details: %s)" % (
        event_body['monitorURL'],
        site_status,
        event_body['monitorFriendlyName'],
        event_body['alertDetails'])

    # send the SMS now
    sms_status = sms_handler(event_body['to_number'], sms_body)

    return_json = (
        "{'isBase64Encoded': 'false', "
        "'statusCode': '200', "
        "'headers': 'application/json', "
        "'body': %s }" % sms_status)
    return return_json