aws_cognito_user_pool_client default_redirect_uri validation makes it mandatory

[emulanob]

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Terraform CLI and Terraform AWS Provider Version

Terraform v0.14.8

• provider registry.terraform.io/hashicorp/aws v3.46.0

Affected Resource(s)

• aws_cognito_user_pool_client

Terraform Configuration Files

Please include all Terraform configurations required to reproduce the bug. Bug reports without a functional reproduction may be closed without investigation.

Example resource block:

variable callback_urls {
  default = []
  type = list(string)
}

variable default_redirect_uri {
  default = ""
}

resource "aws_cognito_user_pool_client" "client" {
  name                 = "client"
  user_pool_id         = aws_cognito_user_pool.pool.id
  callback_urls        = var.callback_urls
  default_redirect_uri = var.default_redirect_url
}

Expected Behavior

The empty values will be ignored and the client will be created without these attributes.

Actual Behavior

A terraform plan throws the following errors:

Error: expected length of default_redirect_uri to be in the range (1 - 1024), got 
Error: invalid value for callback_urls.0 (must satisfy regular expression pattern: [\p{L}\p{M}\p{S}\p{N}\p{P}]+`)

Other info

I'm not sure in which version that validation was introduced because I haven't really touched this particular module in a while, but what it causes is basically making two optional attributes (default_redirect_uri) mandatory. This makes writing reusable modules very complicated as the attribute cannot be null nor empty.
The only way I could get rid of the error was by commenting out the attribute, but again, that makes writing a reusable module impossible.

Maybe I'm missing something here? Please let me know if I can provide any more info.
Thanks.

[ewbankkit]

Related: #14935.

[github-actions]

This functionality has been released in v3.50.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
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