R/yt_oauth.R

In soodoku/tuber: Client for the YouTube API

#' Set up Authorization
#'
#' The function looks for \code{.httr-oauth} in the working directory. If it
#' doesn't find it, it expects an application ID and a secret.
#' If you want to remove the existing \code{.httr-oauth}, set remove_old_oauth
#' to TRUE. By default, it is set to FALSE.
#' The function launches a browser to allow you to authorize the application
#'
#' @param app_id client id; required; no default
#' @param app_secret client secret; required; no default
#' @param scope Character. \code{ssl}, \code{basic},
#' \code{own_account_readonly}, \code{upload_and_manage_own_videos},
#' \code{partner}, and \code{partner_audit}.
#' Required. \code{ssl} and \code{basic} are basically interchangeable.
#' Default is \code{ssl}.
#' @param token path to file containing the token. If a path is given,
#' the function will first try to read from it.
#' Default is \code{.httr-oauth} in the local directory.
#' So if there is such a file, the function will first try to read from it.
#' @param \dots Additional arguments passed to \code{\link{oauth2.0_token}}
#'
#' @return sets the google_token option and also saves \code{.httr_oauth}
#' in the working directory (find out the working directory via \code{getwd()})
#'
#' @export
#'
#' @references \url{https://developers.google.com/youtube/v3/docs/}
#' @references \url{https://developers.google.com/youtube/v3/guides/auth/client-side-web-apps}
#' for different scopes
#'
#' @examples
#'  \dontrun{
#' yt_oauth(paste0("998136489867-5t3tq1g7hbovoj46dreqd6k5kd35ctjn",
#'                 ".apps.googleusercontent.com"),
#'          "MbOSt6cQhhFkwETXKur-L9rN")
#' }

yt_oauth <- function(app_id = NULL, app_secret = NULL, scope = "ssl", token = ".httr-oauth", ...) {
  if (file.exists(token)) {
    google_token <- tryCatch(
      suppressWarnings(readRDS(token)),
      error = function(e) {
        warning(sprintf("Unable to read token from: %s", token))
        NULL
      }
    )
  }
  
  if (!file.exists(token) || (file.exists(token) && is.null(google_token))) {
    stopifnot(!is.null(app_id), !is.null(app_secret))
    myapp <- oauth_app("google", key = app_id, secret = app_secret)
    scope <- match.arg(scope, c(
      "ssl", "basic", "own_account_readonly", 
      "upload_and_manage_own_videos", "partner_audit", "partner"
    ))
    scope_url <- switch(scope,
      ssl = "https://www.googleapis.com/auth/youtube.force-ssl",
      basic = "https://www.googleapis.com/auth/youtube",
      own_account_readonly = "https://www.googleapis.com/auth/youtube.readonly",
      upload_and_manage_own_videos = "https://www.googleapis.com/auth/youtube.upload",
      partner_audit = "https://www.googleapis.com/auth/youtubepartner-channel-audit",
      partner = "https://www.googleapis.com/auth/youtubepartner"
    )
    google_token <- oauth2.0_token(oauth_endpoints("google"), myapp, scope = scope_url, ...)
  }
  
  options(google_token = google_token)
}