Class: Google::Auth::ServiceAccountCredentials

Inherits:
Signet::OAuth2::Client show all
Extended by:
CredentialsLoader, JsonKeyReader
Defined in:
lib/googleauth/service_account.rb

Overview

Authenticates requests using Google's Service Account credentials via an OAuth access token.

This class allows authorizing requests for service accounts directly from credentials from a json key file downloaded from the developer console (via 'Generate new Json Key').

cf Application Default Credentials

Constant Summary collapse

TOKEN_CRED_URI = 
"https://www.googleapis.com/oauth2/v4/token".freeze

Constants included from CredentialsLoader

CredentialsLoader::ACCOUNT_TYPE_VAR, CredentialsLoader::AWS_ACCESS_KEY_ID_VAR, CredentialsLoader::AWS_DEFAULT_REGION_VAR, CredentialsLoader::AWS_REGION_VAR, CredentialsLoader::AWS_SECRET_ACCESS_KEY_VAR, CredentialsLoader::AWS_SESSION_TOKEN_VAR, CredentialsLoader::CLIENT_EMAIL_VAR, CredentialsLoader::CLIENT_ID_VAR, CredentialsLoader::CLIENT_SECRET_VAR, CredentialsLoader::CLOUD_SDK_CLIENT_ID, CredentialsLoader::CREDENTIALS_FILE_NAME, CredentialsLoader::ENV_VAR, CredentialsLoader::GCLOUD_CONFIG_COMMAND, CredentialsLoader::GCLOUD_POSIX_COMMAND, CredentialsLoader::GCLOUD_WINDOWS_COMMAND, CredentialsLoader::NOT_FOUND_ERROR, CredentialsLoader::PRIVATE_KEY_VAR, CredentialsLoader::PROJECT_ID_VAR, CredentialsLoader::REFRESH_TOKEN_VAR, CredentialsLoader::SYSTEM_DEFAULT_ERROR, CredentialsLoader::WELL_KNOWN_ERROR, CredentialsLoader::WELL_KNOWN_PATH

Constants included from BaseClient

BaseClient::AUTH_METADATA_KEY

Instance Attribute Summary collapse

Attributes inherited from Signet::OAuth2::Client

#universe_domain

Class Method Summary collapse

Instance Method Summary collapse

Methods included from CredentialsLoader

from_env, from_system_default_path, from_well_known_path, load_gcloud_project_id, make_creds

Methods included from JsonKeyReader

read_json_key

Methods inherited from Signet::OAuth2::Client

#build_default_connection, #configure_connection, #fetch_access_token!, #orig_fetch_access_token!, #retry_with_error, #token_type, #update_token!, #update_token_signet_base

Methods included from BaseClient

#apply, #expires_within?, #notify_refresh_listeners, #on_refresh, #updater_proc

Constructor Details

#initialize(options = {}) ⇒ ServiceAccountCredentials

Returns a new instance of ServiceAccountCredentials.



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# File 'lib/googleauth/service_account.rb', line 92

def initialize options = {}
  @project_id = options[:project_id]
  @quota_project_id = options[:quota_project_id]
  @enable_self_signed_jwt = options[:enable_self_signed_jwt] ? true : false
  super options
end

Instance Attribute Details

#project_id ⇒ Object (readonly)

Returns the value of attribute project_id.



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# File 'lib/googleauth/service_account.rb', line 38

def project_id
  @project_id
end

#quota_project_id ⇒ Object (readonly)

Returns the value of attribute quota_project_id.



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# File 'lib/googleauth/service_account.rb', line 39

def quota_project_id
  @quota_project_id
end

Class Method Details

.make_creds(options = {}) ⇒ Object

Creates a ServiceAccountCredentials.

Parameters:

  • json_key_io (IO) —

    an IO from which the JSON key can be read

  • scope (string|array|nil) —

    the scope(s) to access

Raises:

  • (ArgumentError) 


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# File 'lib/googleauth/service_account.rb', line 53

def self.make_creds options = {}
  json_key_io, scope, enable_self_signed_jwt, target_audience, audience, token_credential_uri =
    options.values_at :json_key_io, :scope, :enable_self_signed_jwt, :target_audience,
                      :audience, :token_credential_uri
  raise ArgumentError, "Cannot specify both scope and target_audience" if scope && target_audience

  if json_key_io
    private_key, client_email, project_id, quota_project_id, universe_domain = read_json_key json_key_io
  else
    private_key = unescape ENV[CredentialsLoader::PRIVATE_KEY_VAR]
    client_email = ENV[CredentialsLoader::CLIENT_EMAIL_VAR]
    project_id = ENV[CredentialsLoader::PROJECT_ID_VAR]
    quota_project_id = nil
    universe_domain = nil
  end
  project_id ||= CredentialsLoader.load_gcloud_project_id

  new(token_credential_uri:   token_credential_uri || TOKEN_CRED_URI,
      audience:               audience || TOKEN_CRED_URI,
      scope:                  scope,
      enable_self_signed_jwt: enable_self_signed_jwt,
      target_audience:        target_audience,
      issuer:                 client_email,
      signing_key:            OpenSSL::PKey::RSA.new(private_key),
      project_id:             project_id,
      quota_project_id:       quota_project_id,
      universe_domain:        universe_domain || "googleapis.com")
    .configure_connection(options)
end

.unescape(str) ⇒ Object

Handles certain escape sequences that sometimes appear in input. Specifically, interprets the "\n" sequence for newline, and removes enclosing quotes.



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# File 'lib/googleauth/service_account.rb', line 86

def self.unescape str
  str = str.gsub '\n', "\n"
  str = str[1..-2] if str.start_with?('"') && str.end_with?('"')
  str
end

Instance Method Details

#apply!(a_hash, opts = {}) ⇒ Object

Extends the base class to use a transient ServiceAccountJwtHeaderCredentials for certain cases.



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# File 'lib/googleauth/service_account.rb', line 101

def apply! a_hash, opts = {}
  if enable_self_signed_jwt?
    apply_self_signed_jwt! a_hash
  else
    super
  end
end

#enable_self_signed_jwt? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/googleauth/service_account.rb', line 41

def enable_self_signed_jwt?
  # Use a self-singed JWT if there's no information that can be used to
  # obtain an OAuth token, OR if there are scopes but also an assertion
  # that they are default scopes that shouldn't be used to fetch a token,
  # OR we are not in the default universe and thus OAuth isn't supported.
  target_audience.nil? && (scope.nil? || @enable_self_signed_jwt || universe_domain != "googleapis.com")
end

#needs_access_token? ⇒ Boolean

Modifies this logic so it also requires self-signed-jwt to be disabled

Returns:

  • (Boolean) 


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# File 'lib/googleauth/service_account.rb', line 110

def needs_access_token?
  super && !enable_self_signed_jwt?
end