typesafe-config.scala

/**
* typesafe config is our default configuration library. the configuration can be output via the render methods.
* However, sometimes we don't want display the sensitive information to user, such as password.
* this gist is about how to remove sensitive information when output a configuration.
**/

/**
* one solution is that we first render the config and then filter out sensitive information via regex:
*/
config.root().render.replaceAll("(?m)^(\\s+\"password\".*)$", "")

/**
* alternatively, we can also filter out sensitive information and then render it:
*/
    val conf = config
    .root()
    .toConfig()
    .entrySet
    .filterNot(_.getKey.contains("password"))
    .map{f => (f.getKey() -> f.getValue())}
    .toMap
     ConfigValueFactory.fromMap(conf)

/**
* I personally prefer to the second solution because the first one can't handle scenarios as:
* password {
*     aws = "hello"
*     github = "world"
* }
**/

/**
* besides, my colleague Rahul come up with this code:
*/
val secretKeys = config.entrySet().map(_.getKey).filter(_.toLowerCase.contains("password"))
   secretKeys.foldLeft(config)((c, k) => c.withoutPath(k)).root().render