r - ShinyApp Google Login

Question

I have a shinyapp and I want to enable certain features to the members who login to the app using google login. I am not able to implement the Google login and authentication process within my app using the GoogleAuthR package. Does anyone has an example of a sample ShinyApp which allows the audience to login through either google or any other social forum authorizations

Appreciate a demo with code.

PS: I have no intention of running statistics on Google data but I only want to do away with the hassle of creating a login module for my app and let Google login take care of the hassles

Thank you SD

Answer 1

There is an example in the readme, that you can see working as a Shiny app here

If you are intending it for just logging in purposes, check out GoogleID package which is built with googleAuthR with this in mind.

Example code below:

## in global.R
library(googleAuthR)
library(shiny)

options(googleAuthR.scopes.selected = "https://www.googleapis.com/auth/urlshortener")
options(googleAnalyticsR.webapp.client_id = "YOUR_PROJECT_KEY")
options(googleAnalyticsR.webapp.client_secret = "YOUR_CLIENT_SECRET")

shorten_url <- function(url){

  body = list(
    longUrl = url
  )

  f <- gar_api_generator("https://www.googleapis.com/urlshortener/v1/url",
                         "POST",
                         data_parse_function = function(x) x$id)

  f(the_body = body)

}

## server.R
source("global.R")

server <- function(input, output, session){

  ## Create access token and render login button
  access_token <- callModule(googleAuth, "loginButton")

  short_url_output <- eventReactive(input$submit, {
    ## wrap existing function with_shiny
    ## pass the reactive token in shiny_access_token
    ## pass other named arguments
    with_shiny(f = shorten_url, 
               shiny_access_token = access_token(),
               url=input$url)

  })

  output$short_url <- renderText({

    short_url_output()

  })
}

## ui.R
ui <- fluidPage(
  googleAuthUI("loginButton"),
  textInput("url", "Enter URL"),
  actionButton("submit", "Shorten URL"),
  textOutput("short_url")
)


### If the above global.R, server.R and ui.R files are in folder "test" like so:
## /home
##    |->/test/
##            /global.R
##            /ui.R
##            /server.R
##
## Port 1221 has been set in your Google Project options as the port to listen to
## as explained in authentication setup section
## run below in /home directory
shiny::runApp("./test/", launch.browser=T, port=1221)