# Copyright 2021 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

name: 'Authenticate to Google Cloud'
author: 'Google LLC'
description: |-
  Generate credentials to authenticate to Google Cloud from GitHub Actions using
  an OIDC token and Workload Identity Federation.

inputs:
  workload_identity_provider:
    description: |-
      The full identifier of the Workload Identity Provider, including the
      project number, pool name, and provider name. This must be the full
      identifier which includes all parts, for example:
      "projects/123456789/locations/global/workloadIdentityPools/my-pool/providers/my-provider".
    required: true
  service_account:
    description: |-
      Email address or unique identifier of the Google Cloud service account for
      which to generate credentials.
    required: true
  audience:
    description: |-
      The value for the audience (aud) parameter in GitHub's generated OIDC
      token. At present, the only valid value is "sigstore", but this variable
      exists in case custom values are permitted in the future.
    default: 'sigstore'
    required: false
  create_credentials_file:
    description: |-
      If true, the action will securely generate a credentials file which can be
      used for authentication via gcloud and Google Cloud SDKs.
    default: false
    required: false
  activate_credentials_file:
    description: |-
      If true and create_credentials_file is also true, this will set the
      GOOGLE_APPLICATION_CREDENTIALS environment variable to the path to the
      credentials file, which gcloud and Google Cloud SDKs automatically
      consume.
    default: true
    required: false
  token_format:
    description: |-
      Output format for the generated authentication token. For OAuth 2.0 access
      tokens, specify "access_token". For OIDC tokens, specify "id_token". To
      skip token generation, leave this value empty.
    default: ''
    required: false
  delegates:
    description: |-
      List of additional service account emails or unique identities to use for
      impersonation in the chain.
    default: ''
    required: false

  # access token params
  access_token_lifetime:
    description: |-
      Desired lifetime duration of the access token, in seconds. This must be
      specified as the number of seconds with a trailing "s" (e.g. 30s). This is
      only valid when "token_format" is "access_token".
    default: '3600s'
    required: false
  access_token_scopes:
    description: |-
      List of OAuth 2.0 access scopes to be included in the generated token.
      This is only valid when "token_format" is "access_token".
    default: 'https://www.googleapis.com/auth/cloud-platform'
    required: false

  # id token params
  id_token_audience:
    description: |-
      The audience (aud) for the generated Google Cloud ID Token. This is only
      valid when "token_format" is "id_token".
    default: ''
    required: false
  id_token_include_email:
    description: |-
      Optional parameter of whether to include the service account email in the
      generated token. If true, the token will contain "email" and
      "email_verified" claims. This is only valid when "token_format" is
      "id_token".
    default: false
    required: false

outputs:
  credentials_file_path:
    description: |-
      Path on the local filesystem where the generated credentials file resides.
      This is only available if "create_credentials_file" was set to true.
  access_token:
    description: |-
      The Google Cloud access token for calling other Google Cloud APIs. This is
      only available when "token_format" is "access_token".
  access_token_expiration:
    description: |-
      The RFC3339 UTC "Zulu" format timestamp for the access token. This is only
      available when "token_format" is "access_token".
  id_token:
    description: |-
      The Google Cloud ID token. This is only available when "token_format" is
      "id_token".

branding:
  icon: 'lock'
  color: 'blue'

runs:
  using: 'node12'
  main: 'dist/index.js'