Generate Resource ARNs

[aletheia]

Since fetched policy.json file contains a reference to ARNTemplate, this can be used to generate automatically a policy resource schema (thus offering an helper to generate a string for resource field in PolicyStatement).

How it should work

• Generate a resource ARNs after receiving params
• Provide an helper to specify ANY Arn component
• Generate wildcard ARNs when ANY is filled
• Generate resource strings into the array
• Support custom resource string passing

How to implement

• After downloading policy.json file, extract template and build that into a .ts enum
• Make template hooks into strings be of the same kind (some of them are in the form ${} other in the form <>)
• Replace ${partition} with aws, since it is always an AWS
• Add a method to PolicyGenerator.ts to generate resources
• Use a templating engine to fill the template when resource string needs to be provided

[aletheia]

As suggested by @alexcasalboni PolicyGenerator: change .addResource() method to accept an Arn class and define an enum to hold ANY value

[asyschikov]

Partition is not always aws: https://docs.aws.amazon.com/govcloud-us/latest/UserGuide/using-govcloud-arns.html:

In the AWS GovCloud (US) Regions, ARNs begin with:

arn:aws-us-gov

[aletheia]

Great suggestion, it is going to be addressed in the upcoming 2.0 release