MinValue and MaxValue from a parsed parameter are ambiguous

[rclark]

I'm trying to parse a template parameter in order to provide a user with a prompt on the command line. Once they've entered a value, I would like to validate that it is appropriate. If the parameter type is "Number", then I would need to check:

1. that the user entered a numeric value, and
2. if the template file defined a MinValue and/or MaxValue for the parameter,
3. then the user's numeric value falls between the defined min/max.

https://github.com/awslabs/goformation/blob/bf80608c482dde15129c70dd7175c74f143fd5bf/cloudformation/template.go#L36-L37

These fields are float64, which means that even if the optional properties are not present in the template file, the fields will get a zero-value of 0.

So the trouble is, I can't differentiate between a parameter where there is no defined MinValue, or a parameter where there is a defined MinValue of 0.

[rclark]

https://github.com/awslabs/goformation/blob/bf80608c482dde15129c70dd7175c74f143fd5bf/cloudformation/template.go#L34-L35

The same problem exists for validating the length of a "String" or "List" type of parameter.

[rubenfonseca]

Hi @rclark, looking at this now.

[xrn]

This can be closed