# Copyright 2022 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.

import("//build/config.gni")

# eager_package_config produces config-data for omaha-client and pkg-resolver to
# to support eager package updates.
#
# Parameters
#
#   key_config
#     [string] path to JSON config for key config. Required.
#
#     Should be a scope with a map from [string] service_url to [scope] of
#     Omaha server public keys.
#
#     Each scope has two keys, 'latest' and 'historical'. The value of
#     'latest' should be a scope with keys 'id' and 'key'. The value of
#     'historical' should be a list of scopes, each with keys 'id' and 'key'.
#
#     Nothing is optional, but 'historical' may be empty.
#
#     Example:
#         {
#             "https://example.com": {
#                 "latest":
#                     { "id": 123, "key": "foo", },
#                 "historical":
#                     [
#                         { "id": 246, "key": "bar", },
#                         { "id": 369, "key": "baz", },
#                         ...
#                     ],
#             },
#             ...
#         }
#
#         id: [int] The Omaha server public key ID.
#         key: [string] The value of the public key, encoded as a .pem. No
#           validation of the contents is performed here.
#
#   sources
#     [list of string] list of path to JSON config for each eager package.
#
#     Each JSON config should include the following
#       url
#         [string] url of the package.
#
#       flavor (optional)
#         [string] flavor of the package.
#
#       executable (optional)
#         [bool] executability of the package.
#
#       default_channel (optional)
#         [string] if set, this channel will be the default channel. The
#         channel must appear in channels in at least one realm.
#
#       realms
#         [list of objects] list of realms.  Each realm contains the
#         the following.  Nothing is optional.
#           app_id:  The Omaha App ID for the realm
#           channels: [list of strings] The list of channels for the realm.
#
#       service_url (optional)
#         [string] url of the Omaha server.
#
#   data_deps (optional)
#   deps (optional)
#     Same as for any GN target.
template("eager_package_config") {
  input_paths = []
  foreach(source, invoker.sources) {
    input_paths += [ rebase_path(source, root_build_dir) ]
  }

  omaha_client_config_path =
      "$target_gen_dir/$target_name/omaha_client/eager_package_config.json"
  pkg_resolver_config_path =
      "$target_gen_dir/$target_name/pkg_resolver/eager_package_config.json"

  eager_package_config_script_label =
      "${target_name}_eager_package_config_script"
  action(eager_package_config_script_label) {
    script = "//src/sys/pkg/scripts/eager_package_config.py"
    inputs = invoker.sources
    outputs = [
      omaha_client_config_path,
      pkg_resolver_config_path,
    ]
    args = [
             "--out-omaha-client-config",
             rebase_path(omaha_client_config_path, root_build_dir),
             "--out-pkg-resolver-config",
             rebase_path(pkg_resolver_config_path, root_build_dir),
             "--key-config-file",
             rebase_path(invoker.key_config, root_build_dir),
           ] + input_paths
  }

  omaha_client_config_label = "${target_name}_omaha_client_config"
  config_data(omaha_client_config_label) {
    for_pkg = "omaha-client"
    outputs = [ "eager_package_config.json" ]
    sources = [ omaha_client_config_path ]
    deps = [ ":$eager_package_config_script_label" ]
  }

  pkg_resolver_config_label = "${target_name}_pkg_resolver_config"
  config_data(pkg_resolver_config_label) {
    for_pkg = "pkg-resolver"
    outputs = [ "eager_package_config.json" ]
    sources = [ pkg_resolver_config_path ]
    deps = [ ":$eager_package_config_script_label" ]
  }

  group(target_name) {
    forward_variables_from(invoker,
                           [
                             "deps",
                             "data_deps",
                           ])
    if (!defined(data_deps)) {
      data_deps = []
    }
    data_deps += [
      ":$omaha_client_config_label",
      ":$pkg_resolver_config_label",
    ]
  }
}