Terraform JSON Policy Templating Example

template.tf

variable "template_files" {
  default = [
    "policy1.json",
    "policy2.json",
  ]
}

data "template_file" "template" {
  count      = "${length(var.template_files)}"
  template = "${file("${path.module}/templates/${element(var.template_files, count.index)}")}"

  vars {
    some_account_id = "12345678"
    some_role_id      = "${data.terraform_remote_state.other_state.fake_role_id}"
  }
}

resource "aws_s3_bucket_policy" "some_bucket_policy" {
  bucket = "some_bucket"
  policy  = "${element(data.template_file.template.*.rendered, index(var.template_files, "policy1.json"))}"
}