A simple wrapper around utterlyidle

BarelyMagical.kt

import com.googlecode.utterlyidle.*
import com.googlecode.utterlyidle.servlet.ApplicationServlet
import javax.servlet.http.HttpServlet
import javax.servlet.http.HttpServletRequest
import javax.servlet.http.HttpServletResponse

class Application(bindings: List<Binding>): HttpHandler {
    val matcher = BindingMatcher(bindings = bindings)

    override fun handle(request: Request): Response {
        val binding = matcher.match(request)
        return binding.action(request)
    }
}

class BindingMatcher(val bindings: List<Binding>) {
    private fun binding(method: String, path: String) = Binding(Method.valueOf(method), path, { request -> ResponseBuilder.response(Status.NOT_FOUND.description("Route not found")).build() })

    fun match(request: Request): Binding {
        val binding: Binding? = bindings
                .filter { binding -> binding.method.equals(Method.valueOf(request.method())) }
                .find({ binding ->
                    val uriTemplate = UriTemplate.uriTemplate(binding.path)
                    uriTemplate.matches(request.uri().toString())
                })
        return binding ?: binding(request.method(), request.uri().path())
    }
}

class UtterlyIdleBindingBasedServlet(val application: Application) : HttpServlet() {
    override fun service(req: HttpServletRequest?, resp: HttpServletResponse?) {
        val request = ApplicationServlet.request(req)
        ApplicationServlet.transfer(application.handle(request), resp)
    }
}

enum class Method {
    GET, POST, PUT
}

data class Binding(val method: Method, val path: String, val action: (Request) -> Response)

infix fun Pair<Method,String>.by(action: (Request)->Response) = Binding(first, second, action)