.py

# handler.py

import json
import os

from botocore.vendored import requests
import boto3

SLACK_URL = os.environ.get('SLACK_URL')
CLIENT = boto3.client('ssm')


def parameter(event, context):
    formatted = format_message(event)

    send_to_slack(formatted)


def format_message(parameter_event):
    name = parameter_event.get('detail').get('name')
    operation = parameter_event.get('detail').get('operation')
    resp = CLIENT.describe_parameters(
        Filters=[
            {
                "Key": "Name",
                "Values": [name]
            }
        ]
    )
    last_modified_user = resp['Parameters'][0]['LastModifiedUser']
    version = resp['Parameters'][0]['Version']

    text = '\n'.join([
        "Paramater changed in SSM!",
        "A *{}* operation was performed on parameter *{}*".format(operation.upper(), name),
        "Change made by {}".format(last_modified_user),
        "Parameter now on version {}".format(version)
    ])

    return {
        "text": text
    }


def send_to_slack(message, url=SLACK_URL):
    resp = requests.post(url, json=message)

    resp.raise_for_status()