Wolfram Lambda is an example project that illustrates how to implement a simple slash command integration for Slack using the Serverless 1.0 framework for AWS Lambda.

Install serverless:

npm i serverless -g

Change the AWS profile inside serverless.yml as needed (see the serverless documentation on AWS Credentials for details), and adjust the region in serverless.yml if necessary.

Install package dependencies:

npm i

Request an API key from Wolfram Alpha. Add the API key to a .env file in the project root:

echo "WOLFRAM_APP_ID=<APP_ID>" > .env

This file is not under source control and is only used for deployments.

npm run deploy

You can create custom webhook events in JSON files and run the function locally, without deploying the lambda:

npm start test/events/event-population.json

You can also test these events against the deployed version:

serverless invoke -f wolfram -p test/events/event-population.json

After a successful deployment to AWS, serverless prints the service information that you can use to set up a custom integration in Slack:

Service Information
  service: wolfram-lambda
  stage: dev
  region: us-west-2
  endpoints:
    POST - https://f5f6oyjmmb.execute-api.us-east-1.amazonaws.com/dev/wolfram

Navigate to https://api.slack.com/slash-commands, follow instructions on how to create a Slack slash command

Configure the integration with the function URL from above.

See the logs of the deployed function:

serverless logs -f wolfram