Support for Serverless Application Model Cloudformation Templates

[bundyfx]

Running the tool now will give back errors relating to standard syntax use in SAM based Cloudformation templates such as:

E1001 Top level item Globals isn't valid
E1012 Ref ServerlessRestApi not found as a resource or parameter
E1019 String parameter ServerlessRestApi not found in string for Outputs/ApiURL/Value/Fn::Sub

In this case, It becomes a little tricky as resources like ServerlessRestApi might not be statically defined in the template but rather dynamically built to support a certain functions event properties.

[kddejong]

For Globals I wrote the rules around https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/template-anatomy.html. I can't seem to find a lot on Globals... is that a Transform thing as well?

Transform logic hasn't been done yet. Our starting focus was around the CloudFormation Resource Specifications which doesn't include Transforms. That being said I have a few ideas on how we could handle this. I'm not sure we will be able to tackle all the rules with a serverless transform right away but I'm hoping we could handle Fn::GetAtt and Ref. It would be nice if there was a Serverless CloudFormation Spec existed.

Going to mark this for enhancement.
In Scope: Support Ref, GetAtt for Serverless Transforms

Out of Scope:

• Include Transform
• Serverless resource properties. Ideally there would be an AWS generated spec or we may have to look into creating our own for cfn-lint.

[bundyfx]

Awesome - keep up the great work!

[kddejong]

Resolved in version 0.0.10.