Fix literal interpretation and/or accept strings for providers.

[AzySir]

After having an amazing time Googling the absence of dynamic providers and coming through Github issues such as #19932

I was forced to try a magic work around that looked like this -

resource "aws_config_configuration_recorder" "config_recorder" {
  for_each = toset([ for key, value in var.enabled_regions : "aws.${value}"])
  provider = each.value
  name     = "config_recorder"
  role_arn = var.config_recorder_role_arn

  recording_group {
    all_supported                 = true
    include_global_resource_types = true
  }
}

However this does not work because Terraform reads the each.value as a literal provider. So I would've thought adding in "${each.value}"' would work but this also does not allow strings. When I tried to add a provider such as "aws.eu-west-2"` it gives me the below warning -

Warning: Quoted references are deprecated
│
│   on ../main.tf line 3, in resource "aws_config_configuration_recorder" "config_recorder":
│    3:   provider = "aws.eu-west-2"
│
│ In this context, references are expected literally rather than in quotes. Terraform 0.11 and earlier required quotes, but quoted references are
│ now deprecated and will be removed in a future version of Terraform. Remove the quotes surrounding this reference to silence this warning.

Are we able to change this to allow for strings to be passed through?

For my use case is that we need to deploy AWS Config into every single region and unfortunately AWS does not provide anything here to handle this - so I turn to Terraform for assistance and this is also now letting me down unfortunately! If we could rectify this then surely this could be a quick work around for some more clear Terraform code in the "Dynamic Provider" issue

I welcome any assistance thank you!

[jbardin]

Hi @AzySir,

Providers currently need to be statically defined so that they can be resolved when decoding the configuration. We are tracking the possibility of allowing more dynamic assignments in the feature request here: #25244

Thanks!

Duplicate of #25244

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