auth/action.yml

# 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: |-
  Authenticate to Google Cloud from GitHub Actions via Workload Identity
  Federation and GitHub Actions OIDC tokens or via exported Google Cloud service
  account keys.  

inputs:
  project_id:
    description: |-
      ID of the default project to use for future API calls and invocations. If
      unspecified, this action will attempt to extract the value from other
      inputs such as "service_account" or "credentials_json".      
    required: false
  workload_identity_provider:
    description: |-
      The full identifier of the Workload Identity Provider, including the
      project number, pool name, and provider name. If provided, this must be
      the full identifier which includes all parts, for example:
      "projects/123456789/locations/global/workloadIdentityPools/my-pool/providers/my-provider".
      This is mutually exclusive with "credentials_json".      
    required: false
  service_account:
    description: |-
      Email address or unique identifier of the Google Cloud service account for
      which to generate credentials. This is required if
      "workload_identity_provider" is specified.      
    required: false
  audience:
    description: |-
      The value for the audience (aud) parameter in GitHub's generated OIDC
      token. This value defaults to the value of "workload_identity_provider",
      which is also the default value Google Cloud expects for the audience
      parameter on the token.      
    default: ''
    required: false
  credentials_json:
    description: |-
      The Google Cloud JSON service account key to use for authentication. This
      is mutually exclusive with "workload_identity_provider".      
    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: 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:
  project_id:
    description: |-
      Provided or extracted value for the Google Cloud project ID.      
  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'