Terraform-provider-aws: `aws_s3_bucket_object` metadata key name incorrect

[chanhht]

Terraform Version

Terraform v0.11.11

• provider.aws v2.0.0
• provider.null v2.1.0

Affected Resource(s)

• aws_s3_bucket_object

Terraform Configuration Files

provider "aws" {
  region = "ap-southeast-1"
}

data "aws_s3_bucket_object" "test" {
  bucket = "test-terraform-s3-bucket-object"
  key = "test"
}

resource "null_resource" "test" {
  provisioner "local-exec" {
    command = "aws s3api head-object --bucket 'test-terraform-s3-bucket-object' --key 'test' --query 'Metadata'"
  }
}

output "metadata" {
  value = "${data.aws_s3_bucket_object.test.metadata}"
}

Expected Behavior

The output of data.aws_s3_bucket_object.test.metadata key name should be the same as aws cli and aws S3 console (e.g. test )

metadata = {
  test = Test Bucket Object 
}

Actual Behavior

The key name automatic capitalize the first letter (e.g. Test instead of test )

metadata = {
  Test = Test Bucket Object
}

Steps to Reproduce

1. terraform apply

[ewbankkit]

User-defined metadata keys are stored in lowercase:

• https://docs.aws.amazon.com/AmazonS3/latest/dev/UsingMetadata.html#UserMetadata

[chanhht]

Thank @ewbankkit for the doc, then clearly the Metadata keys returned should be in lowercase.

[ewbankkit]

Yes, I'll try and dig in to this when I get time.

[ewbankkit]

It looks like there is an underlying issue with the AWS SDK: https://github.com/aws/aws-sdk-go/issues/445.
Related:

• https://github.com/terraform-providers/terraform-provider-aws/pull/1945

[chanhht]

Thanks, I think the issue has been noticed before and PR is ready. In the meanwhile, since the metadata key always is lowercase, I do a workaround by casting to lowercase.

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