Ktor with Kodein controller example

ktor-kodein-controller-example.kt

import io.ktor.application.*
import io.ktor.auth.*
import io.ktor.response.respondText
import io.ktor.routing.*
import io.ktor.server.engine.embeddedServer
import io.ktor.server.netty.Netty
import org.kodein.di.Kodein
import org.kodein.di.generic.*
import org.kodein.di.ktor.*
import org.kodein.di.ktor.controller.*

fun main() {
    embeddedServer(Netty, port = 8000, module = Application::starter).start(true)
}

fun Application.starter() {
    install(Authentication) {
        basic("basicAuth") {
            realm = "Ktor Server"
            validate { if (it.name == "superuser" && it.password == "password") UserIdPrincipal(it.name) else null }
        }
    }

    kodein {
        bind() from singleton { PublicController(instance()) }
        bind() from singleton { LowerCaseController(instance()) }
        bind() from singleton { UpperCaseController(instance()) }
    }
    install(KodeinControllerFeature)
}

class PublicController(application: Application) : KodeinController {
    override val kodein by kodein { application }
    override fun Routing.installRoutes() {
        route("/public") {
            get {
                call.respondText("Hello WORLD!")
            }
        }
    }
}

class LowerCaseController(application: Application) : KodeinController {
    override val kodein by kodein { application }
    override fun Routing.installRoutes() {
        authenticate("basicAuth") {
            route("/protected") {
                get("/user/lower") {
                    val principal = call.principal<UserIdPrincipal>()!!
                    call.respondText("Hello ${principal.name.toLowerCase()}!")
                }
            }
        }
    }
}

class UpperCaseController(application: Application) : KodeinController {
    override val kodein by kodein { application }
    override fun Routing.installRoutes() {
        authenticate("basicAuth") {
            route("/protected") {
                get("/user/upper") {
                    val principal = call.principal<UserIdPrincipal>()!!
                    call.respondText("Hello ${principal.name.toUpperCase()}!")
                }
            }
        }
    }
}