This is a Swift based AWS Lambda that will publish Simple Notification System (SNS) messages to a Slack channel.
Click here to go to the Slack Apps setup page. Click on "Create New App". Provide a name for your app and choose the workspace you want to post to. Click on "Incoming Webhooks". Click the switch to activate incoming webhooks. Click on "Add new webhook". Choose a channel to post to and click "Allow". You now have a webhook URL. You can go to do the bottom of the "Incoming Webhooks" page and copy the URL.
Before continuing you will need Docker Desktop for Mac installed. You will also need the AWS command line interface and AWS SAM installed. You can install awscli and sam with Homebrew.
brew tap aws/tap
brew install awscli
brew install aws-sam-cli
There are two stages to getting the Lambda installed.
The install process can be broken into two stages, each with its own shell script.
- build-and-package.sh: Building and packaging the lambda. This uses the
archivecommand plugin that comes with the swift-aws-lambda-runtime - deploy.sh: Deploying the packaged Lambda to AWS using AWS SAM. The first time you run this you should add the command line parameter
--guided. This will ask a number of questions about how you want the deployment to work.
The Lambda uses the Environment variable SLACK_HOOK_URL to get the URL to post to. You need to edit the SAM `deploy.yml`` to point this environment variable to the correct URL.