Dev actions controller/router + user registration

app/controllers/devel/DevActionsController.scala

@@ -0,0 +1,32 @@
+package controllers.devel
+
+import dao.UsersDAO
+import play.api.libs.functional.syntax.toFunctionalBuilderOps
+import play.api.libs.json.{JsError, JsPath, Json, Reads}
+import play.api.mvc.*
+
+import javax.inject.Inject
+import scala.concurrent.{ExecutionContext, Future}
+
+class DevActionsController @Inject()(val controllerComponents: ControllerComponents,
+                                     val usersDAO: UsersDAO)
+                                    (implicit val ec: ExecutionContext)
+  extends BaseController {
+
+  private case class UserData(username: String, password: String)
+  private implicit val userDataReads: Reads[UserData] = (
+    (JsPath \ "username").read[String] and (JsPath \ "password").read[String]
+  )(UserData.apply)
+
+  def createUser = Action.async(parse.json) { implicit request =>
+    request.body.validate[UserData].fold(
+      errors => Future.successful(BadRequest(JsError.toJson(errors))),
+      userData => usersDAO.create(userData.username, userData.password)
+        .map {
+          case Left(UsersDAO.UsernameTaken) => BadRequest(Json.obj("error" -> "Username exists"))
+          case Left(_ex) => BadRequest(Json.obj("error" -> "User creation error"))
+          case Right(user) => Ok(Json.toJson(user))
+        }
+    )
+  }
+}

app/controllers/devel/DevRouter.scala

@@ -0,0 +1,24 @@
+package controllers.devel
+
+import play.api.Environment
+import play.api.Mode.Dev
+import play.api.mvc.*
+import play.api.routing.Router.Routes
+import play.api.routing.SimpleRouter
+import play.api.routing.sird.{POST, UrlContext}
+
+import javax.inject.Inject
+
+class DevRouter @Inject()(environment: Environment, controller: DevActionsController) extends SimpleRouter {
+  override def routes: Routes = {
+    if (environment.mode == Dev) {
+      devRoutes
+    } else {
+      PartialFunction.empty
+    }
+  }
+
+  private val devRoutes: PartialFunction[RequestHeader, Handler] = {
+    case POST(p"/users") => controller.createUser()
+  }
+}