Fix bug in setting dynamic encryption_configuration value

[LawrenceWarren]

what

• When trying to create an S3 bucket, the following error is encountered:

Error: Invalid dynamic for_each value

  on .terraform/main.tf line 225, in resource "aws_s3_bucket_replication_configuration" "default":
 225:           for_each = try(compact(concat(
 226:             [try(rule.value.destination.encryption_configuration.replica_kms_key_id, "")],
 227:             [try(rule.value.destination.replica_kms_key_id, "")]
 228:           ))[0], [])
    ├────────────────
    │ rule.value.destination.encryption_configuration is null
    │ rule.value.destination.replica_kms_key_id is "arn:aws:kms:my-region:my-account-id:my-key-alias"

Cannot use a string value in for_each. An iterable collection is required.

• This is caused in my case by having s3_replication_rules.destination.encryption_configuration.replica_kms_key_id set.

why

• There is a bug when trying to create an S3 bucket, which causes an error that stops the bucket being created

  • Basically, there are two attributes that do the same thing (for backwards compatability)
    • s3_replication_rules.destination.encryption_configuration.replica_kms_key_id (newer)
    • s3_replication_rules.destination.replica_kms_key_id (older)
  • There is logic to:
    • A) use the newer of these two attributes
    • B) fall back to the older of the attributes if it is set and the newer is not
    • C) fall back to an empty array if nothing is set
  • There is a bug in steps A/B, where by selecting one or the other, we end up with the string value, and not an iterable
  • The simplest solution, which I have tested successfully on existing buckets, is to wrap the output of that logic in a list

• This error is easily replicable by trying compact(concat([try("string", "")], [try("string", "")]))[0] in the Terraform console, which is a simplified version of the existing logic used above

• The table below demonstrates the possible values of the existing code - you can see the outputs for value 2, value 3, and value 4 are not lists:

Key	Value 1	Value 2	Value 3	Value 4
newer	null	"string1"	null	"string1"
older	null	null	"string2"	"string2"
output	[]	"string1"	"string2"	"string1"

[LawrenceWarren]

@johncblandii @joe-niland can I get a review please?

[joe-niland]

Hi @LawrenceWarren

Could you please run the following and commit the changes?

make init
make github/init
make readme

[LawrenceWarren]

That's done.

[Nuru]

/terratest