Loads credentials from a file identified via a search strategy known as
Application Default Credentials (ADC). The hope is to make auth "just work"
for someone working on Google-provided infrastructure or who has used Google
tooling to get started, such as the gcloud command line tool.
A sequence of paths is consulted, which we describe here, with some abuse of
notation. ALL_CAPS represents the value of an environment variable and %||%
is used in the spirit of a null coalescing operator.
GOOGLE_APPLICATION_CREDENTIALS
CLOUDSDK_CONFIG/application_default_credentials.json
# on Windows:
(APPDATA %||% SystemDrive %||% C:)\gcloud\application_default_credentials.json
# on not-Windows:
~/.config/gcloud/application_default_credentials.json
If the above search successfully identifies a JSON file, it is parsed and
ingested as a service account, an external account ("workload identity
federation"), or a user account. Literally, if the JSON describes a service
account, we call credentials_service_account() and if it describes an
external account, we call credentials_external_account().
credentials_app_default(scopes = NULL, ..., subject = NULL)An httr::TokenServiceAccount, a WifToken,
an httr::Token2.0 or NULL.
A character vector of scopes to request. Pick from those listed at https://developers.google.com/identity/protocols/oauth2/scopes.
For certain token flows, the
"https://www.googleapis.com/auth/userinfo.email" scope is unconditionally
included. This grants permission to retrieve the email address associated
with a token; gargle uses this to index cached OAuth tokens. This grants no
permission to view or send email and is generally considered a low-value
scope.
Additional arguments passed to all credential functions.
An optional subject claim. Use for a service account which has
been granted domain-wide authority by an administrator. Such delegation of
domain-wide authority means that the service account is permitted to act on
behalf of users, without their consent. Identify the user to impersonate
via their email, e.g. subject = "user@example.com".
Other credential functions:
credentials_byo_oauth2(),
credentials_external_account(),
credentials_gce(),
credentials_service_account(),
credentials_user_oauth2(),
token_fetch()
if (FALSE) {
credentials_app_default()
}
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