Resource-Specific Schema Attribute Validation Functions

[bflad]

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Description

NOTE: This issue needs more design consideration before implementation.

Currently the codebase has a generic ARN validation helper, validateArn, which is commonly applied in many places. However, we could offer more specific ARN validation, such as ensuring specific service and resource type are applied in attributes accepting ARNs. More broadly, there are other places where this may be very helpful, such as common resource identifiers like EC2 Security Group, Subnet, and VPC IDs.

For example, the Image Builder API includes the more specific ARN patterns in the API model, which were included in the initial Terraform AWS Provider resource implementations.

Initial considerations:

• Each Terraform AWS Provider resource has a common pattern for providing the regular expression patterns, other resources can reference the pattern to create a validation function
• Each Terraform AWS Provider resource has a common pattern for providing the regular expression patterns along with the associated attribute, other resources can reference the resource and attribute to create a validation function
• Each Terraform AWS Provider resource has a common pattern for providing the regular expression patterns and validation function along with the associated attribute, other resources can reference that resource and attribute for the validation function

Probably much more to think about, but jotting this down to start. 😄

References

• New Resource: aws_imagebuilder_image_pipeline #16299
• https://docs.aws.amazon.com/imagebuilder/latest/APIReference/API_CreateImagePipeline.html

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