Using play.api.libs.Crypto from the console

Question

scala> play.api.libs.Crypto.encryptAES("test")
com.typesafe.config.ConfigException$Missing: No configuration setting found for key 'play.crypto.secret'

I've set the variable in application.conf, but I'm not sure how to generate the global state such that Crypto picks up the variable.

The documentation is incorrect:

scala> import play.api._
import play.api._

scala> val application = new DefaultApplication(new File("."), this.getClass.getClassloader, None, Play.Mode.Dev)
<console>:14: error: not enough arguments for constructor DefaultApplication: (environment: play.api.Environment, applicationLifecycle: play.api.inject.DefaultApplicationLifecycle, injector: play.api.inject.Injector, configuration: play.api.Configuration, requestHandler: play.api.http.HttpRequestHandler, errorHandler: play.api.http.HttpErrorHandler, actorSystem: akka.actor.ActorSystem, plugins: play.api.Plugins)play.api.DefaultApplication.
Unspecified value parameters requestHandler, errorHandler, actorSystem...
      val application = new DefaultApplication(new File("."), this.getClass.getClassloader, None, Play.Mode.Dev)

I've tried loading into the test:console and loading via

val application = new play.api.test.FakeApplication(additionalConfiguration = Map("play.application.secret" -> "foobar"))

But that didn't load it into the global config object.

Answer 1

a brute force way is to start the application from within the console, and doing that depends on whether you customize the ApplicationLoader or not. in my case, i do (so that i can use macwire for DI). here's how it works for me, i have this in my build.sbt:

initialCommands in console := """
  import play.api.{ApplicationLoader, Environment, Mode}
  import com.projectname.apiserver.global.MacwireApplicationLoader
  import com.projectname.apiserver.model._
  val env = Environment(new java.io.File("."), this.getClass.getClassLoader, Mode.Dev)
  val context = ApplicationLoader.createContext(env)
  val loader = new MacwireApplicationLoader
  val registry = loader.loadRegistry(context)
  import registry._
"""

and a custom application loader:

/**
 * MacwireApplicationLoader replaces the default Play application loader with a
 * compile time DI system (using macwire).
 *
 * More info: https://www.playframework.com/documentation/2.5.x/ScalaCompileTimeDependencyInjection
 */
class MacwireApplicationLoader extends ApplicationLoader {
  def load(context: Context) = loadRegistry(context).application

  def loadRegistry(context: Context): BuiltInComponentsFromContext with Registry =
    new BuiltInComponentsFromContext(context)
      with AppComponents
      with ApplyEvolutions
}

trait AppComponents
    extends BuiltInComponents
    with NingWSComponents
    with Registry {

  lazy val assets: Assets = wire[Assets]
  lazy val config = configuration
  lazy val app = application
  lazy val ws = wsClient

  lazy val router: Router = {
    lazy val prefix = "/"
    wire[Routes]
  }

}

trait ApplyEvolutions extends EvolutionsComponents {
  applicationEvolutions
  override def dynamicEvolutions = new DynamicEvolutions
}

then when i enter the console, i can just do:

[api-server] $ console
[info] Starting scala interpreter...
[info]
2016-07-23 11:11:01,106 [INFO] [p.a.d.DefaultDBApi] - Database [default] connected at jdbc:postgresql://localhost:5432/databasename
import play.api.{ApplicationLoader, Environment, Mode}
import com.projectname.apiserver.global.MacwireApplicationLoader
import com.projectname.apiserver.model._
env: play.api.Environment = Environment(.,scala.tools.nsc.interpreter.IMain$TranslatingClassLoader@5b0c7029,Dev)
context: play.api.ApplicationLoader.Context = Context(Environment(.,scala.tools.nsc.interpreter.IMain$TranslatingClassLoader@5b0c7029,Dev),None,play.core.DefaultWebCommands@352ca33b,Configuration(Config(SimpleConfigObject({"akka":{"actor":{"creation-timeout":"20s","debug":{"autoreceive":"off","event-stream":"off","fsm":"off","lifecycle":"off","receive":"off","router-misconfiguration":"off","unhandled":"off"},"default-dispatcher":{"attempt-teamwork":"on","default-executor":{"fallback":"fork-join-executor"},"executor":"defa...Welcome to Scala 2.11.8 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_45).
Type in expressions for evaluation. Or try :help.

scala> crypto.encryptAES("test")
res0: String = 2-ZLIW79WqQff4SDZ+aWLkf38cZyU=