Allow Cognito Lambda Configuration Outside aws_cognito_user_pool

[grochoge]

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Description

Please create a new resource type to allow configuring Lambda triggers on a Cognito user pool outside of the aws_cognito_user_pool resource.

I want to use the ID of a particular user pool client inside of a Lambda, but this is currently impossible due to a cycle error. The Lambda depends on the user pool client which depends on the user pool which depends on the Lambda.

New or Affected Resource(s)

• aws_cognito_user_pool
• aws_cognito_user_pool_lambda_config (NEW)

Potential Terraform Configuration

resource "aws_cognito_user_pool" "Pool" {
  name = "Pool"
}

resource "aws_cognito_user_pool_lambda_config" "Pool" {
  user_pool_id = aws_cognito_user_pool.Pool.id
  pre_token_generation = aws_lambda_function.CognitoPreToken.arn
}

resource "aws_cognito_user_group" "Group" {
  name         = "Group"
  user_pool_id = aws_cognito_user_pool.Pool.id
}

resource "aws_cognito_user_pool_client" "Client" {
  name         = "Client"
  user_pool_id = aws_cognito_user_pool.Pool.id
}

data "archive_file" "CognitoPreToken" {
  type        = "zip"
  output_path = "${path.module}/.temp/CognitoPreToken.zip"

  source {
    filename = "CognitoPreToken.py"
    content = templatefile("${path.module}/lambda/CognitoPreToken.py", {
      client_groups = {
        aws_cognito_user_pool_client.Client.id = aws_cognito_user_group.Group.name
      }
    })
  }
}

resource "aws_lambda_function" "CognitoPreToken" {
  filename         = data.archive_file.CognitoPreToken.output_path
  source_code_hash = data.archive_file.CognitoPreToken.output_base64sha256
  runtime          = "python3.9"
}

References

• https://docs.aws.amazon.com/cognito-user-identity-pools/latest/APIReference/API_UpdateUserPool.html

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