Add in slack emoji support

README.md

@@ -48,6 +48,7 @@ If you want to subscribe AWS Lambda Function created by this module to an existi
 | kms_key_arn | ARN of the KMS key used for decrypting slack webhook url | string | `` | no |
 | lambda_function_name | The name of the Lambda function to create | string | `notify_slack` | no |
 | slack_channel | The name of the channel in Slack for notifications | string | - | yes |
+| slack_emoji | The name of the slack emoji you want to use. | string | `:aws:` | no |
 | slack_username | The username that will appear on Slack on messages | string | - | yes |
 | slack_webhook_url | The URL of Slack webhook | string | - | yes |
 | sns_topic_name | The name of the SNS topic to create | string | - | yes |

functions/notify_slack.py

@@ -51,10 +51,12 @@ def notify_slack(message, region):
 
     slack_channel = os.environ['SLACK_CHANNEL']
     slack_username = os.environ['SLACK_USERNAME']
+    slack_emoji = os.environ['SLACK_EMOJI']
 
     payload = {
         "channel": slack_channel,
         "username": slack_username,
+        "icon_emoji": slack_emoji,
         "attachments": []
     }
     if "AlarmName" in message:

main.tf

@@ -49,6 +49,7 @@ resource "aws_lambda_function" "notify_slack" {
       SLACK_WEBHOOK_URL = "${var.slack_webhook_url}"
       SLACK_CHANNEL     = "${var.slack_channel}"
       SLACK_USERNAME    = "${var.slack_username}"
+      SLACK_EMOJI       = "${var.slack_emoji}"
     }
   }
 

variables.tf

@@ -24,6 +24,11 @@ variable "slack_username" {
   description = "The username that will appear on Slack on messages"
 }
 
+variable "slack_emoji" {
+  default = ":aws:"
+  description = "A custom emoji that will appear on slack messages"
+}
+
 variable "kms_key_arn" {
   description = "ARN of the KMS key used for decrypting slack webhook url"
   default     = ""