iam: support `Role.fromLookup()` method

[go-to-k]

Describe the feature

A generic Context Provider for CloudControl API has been added in aws-cdk-cli.

aws/aws-cdk-cli#138

This allows us to implement new context methods.

Use Case

There will be many cases where IAM roles will be created outside the CFn stack and used.
Importing actual existing roles from AWS accounts is very convenience. It is also useful to be able to make an error if a role does not exist.

Proposed Solution

Add Role.fromLookup method using the new context provider.

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

2.181.0

Environment details (OS name and version, etc.)

Mac

[pahud]

Hello @go-to-k,

Thank you for submitting this feature request. Adding a Role.fromLookup() method to the IAM module would be a valuable addition to the CDK, especially with the new CloudControl API context provider now available.

This type of lookup functionality has proven to be very useful in other CDK modules when working with existing resources, and it makes sense to extend this pattern to IAM roles as well. It aligns well with the CDK's philosophy of making it easier to work with existing AWS resources.

Since you've indicated you may be able to implement this feature, we'd be happy to help guide you through the process.

Thanks again for your contribution to making the CDK better.

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