googledrive (version 1.0.1)

drive_auth: Authorize googledrive

Description

Authorize googledrive to view and manage your Drive files. This function is a wrapper around gargle::token_fetch().

By default, you are directed to a web browser, asked to sign in to your Google account, and to grant googledrive permission to operate on your behalf with Google Drive. By default, these user credentials are cached in a folder below your home directory, ~/.R/gargle/gargle-oauth, from where they can be automatically refreshed, as necessary. Storage at the user level means the same token can be used across multiple projects and tokens are less likely to be synced to the cloud by accident.

If you are interacting with R from a web-based platform, like RStudio Server or Cloud, you need to use a variant of this flow, known as out-of-band auth ("oob"). If this does not happen automatically, you can request it yourself with use_oob = TRUE or, more persistently, by setting an option via options(gargle_oob_default = TRUE).

Usage

drive_auth(
  email = gargle::gargle_oauth_email(),
  path = NULL,
  scopes = "https://www.googleapis.com/auth/drive",
  cache = gargle::gargle_oauth_cache(),
  use_oob = gargle::gargle_oob_default(),
  token = NULL
)

Arguments

email

Optional. Allows user to target a specific Google identity. If specified, this is used for token lookup, i.e. to determine if a suitable token is already available in the cache. If no such token is found, email is used to pre-select the targetted Google identity in the OAuth chooser. Note, however, that the email associated with a token when it's cached is always determined from the token itself, never from this argument. Use NA or FALSE to match nothing and force the OAuth dance in the browser. Use TRUE to allow email auto-discovery, if exactly one matching token is found in the cache. Defaults to the option named "gargle_oauth_email", retrieved by gargle::gargle_oauth_email().

path

JSON identifying the service account, in one of the forms supported for the txt argument of jsonlite::fromJSON() (typically, a file path or JSON string).

scopes

A character vector of scopes to request. Pick from those listed at https://developers.google.com/identity/protocols/googlescopes.

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. It is considered a low value scope and does not appear on the consent screen.

cache

Specifies the OAuth token cache. Defaults to the option named "gargle_oauth_cache", retrieved via gargle::gargle_oauth_cache().

use_oob

Whether to prefer "out of band" authentication. Defaults to the option named "gargle_oob_default", retrieved via gargle::gargle_oob_default().

token

A token with class Token2.0 or an object of httr's class request, i.e. a token that has been prepared with httr::config() and has a Token2.0 in the auth_token component.

Details

Most users, most of the time, do not need to call drive_auth() explicitly -- it is triggered by the first action that requires authorization. Even when called, the default arguments often suffice. However, when necessary, this function allows the user to explicitly:

• Declare which Google identity to use, via an email address. If there are multiple cached tokens, this can clarify which one to use. It can also force googledrive to switch from one identity to another. If there's no cached token for the email, this triggers a return to the browser to choose the identity and give consent.

• Use a service account token.

• Bring their own Token2.0.

• Specify non-default behavior re: token caching and out-of-bound authentication.

For details on the many ways to find a token, see gargle::token_fetch(). For deeper control over auth, use drive_auth_configure() to bring your own OAuth app or API key. Read more about gargle options, see gargle::gargle_options.

See Also

Other auth functions: drive_auth_configure(), drive_deauth()

Examples

# NOT RUN {
## load/refresh existing credentials, if available
## otherwise, go to browser for authentication and authorization
drive_auth()

## see user associated with current token
drive_user()

## force use of a token associated with a specific email
drive_auth(email = "[e-mail]")
drive_user()

## force a menu where you can choose from existing tokens or
## choose to get a new one
drive_auth(email = NA)

## use a 'read only' scope, so it's impossible to edit or delete files
drive_auth(
  scopes = "https://www.googleapis.com/auth/drive.readonly"
)

## use a service account token
drive_auth(path = "foofy-83ee9e7c9c48.json")
# }