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#' Default key
#'
#' The default user key can be set in the `USER_KEY` variable and otherwise
#' is `~/.ssh/id_rsa`. Note that on Windows we treat `~` as the windows user
#' home (and not the documents folder).
#'
#' The `my_pubkey()` function looks for the public key by appending `.pub`
#' to the above key path. If this file does not exist, it reads the private key file
#' and automatically derives the corresponding pubkey. In the latter case the user
#' may be prompted for a passphrase if the private key is protected.
#'
#' @export
#' @rdname my_key
#' @examples # Set random RSA key as default
#' key <- rsa_keygen()
#' write_pem(key, tmp <- tempfile(), password = "")
#' rm(key)
#' Sys.setenv("USER_KEY" = tmp)
#'
#' # Check the new keys
#' print(my_key())
#' print(my_pubkey())
my_key <- function(){
path <- default_key()
if(!file.exists(path))
stop("No suitable user key found.")
read_key(path)
}
#' @export
#' @rdname my_key
my_pubkey <- function(){
path <- paste0(default_key(), ".pub")
if(file.exists(path))
return(read_pubkey(path))
# alternatively derive pubkey from key
key <- my_key()
pubkey <- key$pubkey
try(write_ssh(pubkey, path), silent = TRUE)
pubkey
}
default_key <- function(){
normalize_home(Sys.getenv("USER_KEY", "~/.ssh/id_rsa"))
}
normalize_home <- function(path = NULL){
path <- as.character(path)
if(is_windows()){
homedir <- Sys.getenv('USERPROFILE')
is_home <- grepl("^~", path)
path[is_home] <- paste0(homedir, substring(path[is_home], 2))
}
normalizePath(path, mustWork = FALSE)
}
is_windows <- function(){
.Platform$OS.type == "windows"
}
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