connectcreds

connectcreds provides low-level utilities for Shiny developers and R package authors building tools that make use of Posit Connect’s viewer-based credentials.

Installation

You can install connectcreds from CRAN with:

install.packages("connectcreds")

Or, install the development version of connectcreds from GitHub with:

# install.packages("pak")
pak::pak("posit-dev/connectcreds")

Usage

connectcreds includes helper functions for implementing Posit Connect’s viewer-based credentials in Shiny applications. These helpers are meant to be called in the context of a Shiny server function, as follows:

server <- function(input, output, session) {
  token <- "PAT for local development"
  if (connectcreds::has_viewer_token()) {
    token <- connectcreds::connect_viewer_token()
  }

  # ...
}

Usually, though, these helpers will be used internally by packages that authenticate with various services. For example, here is a simplified version of gh::gh_token() that returns a GitHub OAuth token for the viewer on Connect but uses a GitHub personal access token when testing locally:

gh_token <- function() {
  rlang::check_installed("connectcreds", "for viewer-based authentication")
  if (connectcreds::has_viewer_token("https://github.com")) {
    token <- connectcreds::connect_viewer_token("https://github.com")
    return(token$access_token)
  }
  Sys.getenv("GITHUB_PAT")
}

server <- function(input, output, session) {
  # A Shiny output that shows the user's GitHub username:
  output$gh_handle <- renderText({
    resp <- gh::gh_whoami(.token = gh_token())
    resp$login
  })

  # ...
}

License

MIT (c) Posit Software, PBC