Reference SSM Parameters as Variables

This is a Feature Proposal

Description

I was thinking it would be great to have the ability to reference SSM parameters as serverless variables. The syntax would probably look something like this:

service: new-service
provider: aws
functions:
  hello:
      name: ${ssm:param-name}
      handler: handler.hello

I looked at the current code, and I think the implementation would be pretty similar to the s3 variable reference. I’d be happy to test a patch and submit a pull request if there is interest. The feature should include a couple things:

• Ability to reference both regular and path-based SSM parameters.
• Ability to specify WithDecryption. Not sure quite yet where this would go. Any ideas for this one? Maybe a new provider option?

[lorengordon]

I created https://github.com/serverless/serverless/issues/4062 to demonstrate working code and further the discussion.

[eahefnawy]

@akleiber @exoego thanks for the heads up!