Slack Notification using Python Code

Slack has limitations in creating Webhooks in Free plan. However, we can use existing Webhook to send a notification in different Slack Channels. If we send Slack Payload to Webhook without mentioning Slack Channel name, the message will send to the default Slack Channel.


import logging, os, json
from base64 import b64decode
from urllib.request import Request, urlopen
from urllib.error import URLError, HTTPError

#Update following variables before test.
SLACK_CHANNEL_NAME=<SLACK_CHANNEL_NAME>     #Exaple: '#my-reporting-slack-channel'
SLACK_USERNAME=<SLACK_USERNAME>        #Exaple: 'reporting-user'

#Logging Variables
logger = logging.getLogger()

#Slack Message function
def lambda_to_slack(SLACK_MSG):
    payload = {'text':SLACK_MSG,'channel':SLACK_CHANNEL_NAME,'icon_emoji':SLACK_ICON_EMOJI,'username':SLACK_USERNAME}
    print('Sending Message to Slack')
    req = Request(SLACK_WEBHOOK_URL, json.dumps(payload).encode('utf-8'))
        response = urlopen(req)"Message posted to %s", payload['channel'])
    except HTTPError as e:
        logger.error("Request failed: %d %s", e.code, e.reason)
    except URLError as e:
        logger.error("Server connection failed: %s", e.reason)
    return 0

#Lamdba Function Code
def lambda_handler(event, context):
    # TODO implement
    lambda_to_slack('hello from AWS')
    return 0


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