Python script for AWS lambda to forward AWS IoT 1-Click event to IFTTT

1ClickToIfttt_lambda.py

import json
import os
import urllib.request
import logging

logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)


def lambda_handler(event, context):

    logger.info('request event: \n' + json.dumps(event))

    key = event['placementInfo']['attributes'].get('key')
    if key is None:
        logger.error('key is not defined.')
        return

    event_prefix = event['placementInfo']['attributes'].get('event_prefix')
    event_suffix = event['placementInfo']['attributes'].get('event_suffix')
    if event_prefix is None or event_suffix is None:
        logger.error('event is not defined.')
        return
    else:
        event_prefix = replaceValues(event_prefix, event)
        event_suffix = replaceValues(event_suffix, event)
    eventName = event_prefix + '_' + event_suffix

    values = {}
    for idx in range(1, 4):
        vkey = 'value{}'.format(idx)
        value = event['placementInfo']['attributes'].get(vkey)
        if value is None:
            value = 'None'
        else:
            value = replaceValues(value, event)
        values[vkey] = value

    url = 'https://maker.ifttt.com/trigger/' + eventName + '/with/key/' + key
    data = json.dumps(values).encode('utf-8')
    method = 'POST'
    headers = {'Content-Type' : 'application/json'}
    req = urllib.request.Request(url, data = data, method = method, headers = headers)
    with urllib.request.urlopen(req) as res:
        body = res.read().decode('utf-8')
        logger.info('response body: \n' + body)


def replaceValues(str, event):
    ret_str = str
    ret_str = ret_str.replace('$deviceId', event['deviceInfo']['deviceId'])
    ret_str = ret_str.replace('$remainingLife', '{:.1f}'.format(event['deviceInfo']['remainingLife']))
    ret_str = ret_str.replace('$clickType', event['deviceEvent']['buttonClicked']['clickType'])
    ret_str = ret_str.replace('$placementName', event['placementInfo']['placementName'])
    return ret_str