# Copyright 2018 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

declare_args() {
  # Location of CloudKMS crypto keys within the fuchsia infra GCE project.
  cloudkms_key_dir =
      "projects/fuchsia-infra/locations/global/keyRings/test-secrets/cryptoKeys"
}

# Describes a 'secret', a plaintext to be supplied to a test at runtime. The
# JSON spec of the secret and its associated ciphertext file will be written to
# $root_build_dir/secret_specs/$target_name.json
# and
# $root_build_dir/secret_spec/ciphertext/$target_name.ciphertext
# respectively.
#
# Parameters
#
#   key_name
#     Required: Name of the private key used for encryption. It is assumed that this key
#     lives in CloudKMS at
#     projects/fuchsia-infra/locations/global/keyRings/test-secrets/cryptoKeys/<key_name>
#
#   ciphertext_file
#     Required: Relative path to a text file containing the encrypted plaintext
#     (maximum 64KiB)
template("secret_spec") {
  assert(defined(invoker.key_name), "key_name must be defined.")
  assert(defined(invoker.ciphertext_file), "ciphertext_file must be defined.")

  secret_spec_dir = "$root_build_dir/secret_specs"

  copy(target_name) {
    sources = [
      invoker.ciphertext_file,
    ]
    outputs = [
      "$secret_spec_dir/ciphertext/$target_name.ciphertext",
    ]
  }

  secret_spec = {
    cloudkms_key_path = "$cloudkms_key_dir/${invoker.key_name}"
    ciphertext_file = invoker.ciphertext_file
  }

  write_file("$secret_spec_dir/$target_name.json", secret_spec, "json")
}