r - How to edit a .yml file in Shiny

I have a Shiny application which pulls data from various APIs and databases. All the sensitive data pertaining to credentials, usernames, passwords etc. are stored in a config.yml file. The code within the Shiny app calls variables within the config.yml file for connecting to different APIs/databases.

I have also created an administrator login for the Shiny application and want to provide access to the administrator for making changes in the config.yml file. The Shiny app has a separate tab called Admin whiich opens up when the administrator logs in. How can I open the config.yml file and allow edits by the administrator and save it?

Answer

I created a tab for the configuration file and using Shiny Ace as editor:

library(shinyAce) 

# UI

aceEditor(
          outputId = "someID",

          value = read.delim("config.yml"),
          placeholder = "Connection configuration file"
         ), 

        actionButton("save", label = "Save Configuration")

# Sever

 observeEvent(input$save, {
    write(x = input$someID, file = "config.yml")

    print("file saved")

    })

Then you can call to the config.yml and apply the configurations.