Authorize mermaidr to access the MERMAID API. You will be directed to a web browser and asked to sign in to MERMAID Collect. By default, these user credentials are cached in a file named .httr-oauth in the current working directory, from where they can be automatically refreshed, as necessary.

mermaid_auth(
token = NULL,
new_user = FALSE,
key = mermaid_key,
cache = getOption("mermaidr.httr_oauth_cache"),
verbose = TRUE
)

## Arguments

token

optional; an actual token object or the path to a valid token stored as an .rds file

new_user

logical, defaults to FALSE. Set to TRUE if you want to wipe the slate clean and re-authenticate with the same or different account. This disables the .httr-oauth file in current working directory.

key

the "Client ID" for the application

cache

logical indicating if mermaidr should cache credentials in the default cache file .httr-oauth

verbose

logical; do you want informative messages?

## Details

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

• force the creation of a new token

• retrieve current token as an object, for possible storage to an .rds file

• read the token from an object or from an .rds file

• prevent caching of credentials in .httr-oauth

In a direct call to mermaid_auth, the user can dictate whether interactively-obtained credentials will be cached in .httr_oauth. If unspecified, these arguments are controlled via options, which, if undefined at the time mermaidr is loaded, are defined like so:

cache

Set to option mermaidr.httr_oauth_cache, which defaults to TRUE

To override these defaults in persistent way, predefine one or more of them with lines like this in a .Rprofile file:

options(mermaidr.httr_oauth_cache = FALSE)

See Startup for possible locations for this file and the implications thereof.

## Examples

if (FALSE) {
# Load/refresh existing credentials, if available
# Otherwise, go to browser for authentication and authorization
mermaid_auth()

# Force a new token to be obtained
mermaid_auth(new_user = TRUE)

# Store token in an object and then to file
ttt <- mermaid_auth()
saveRDS(ttt, "ttt.rds")