ateek/Ktor-Middleware

A dead-simple Middleware Implementation for the Ktor Web Framework

Ktor-Middleware

A dead-simple middleware for Kotlin/Ktor

Installation

pom.xml

<dependency>
	<groupId>com.github.kimar</groupId>
        <artifactId>Ktor-Middleware</artifactId>
        <version>0.2.2</version>
</dependency>

build.gradle

compile 'com.github.kimar:Ktor-Middleware:0.2.2'

Usage

Inside your route handler

Let's assume you've got an upload route you'd like to secure using BearerAuthentication, one way would be to install this routing using Ktor-Middleware which will then, in turn, automatically filter all failed middlewares and report and error accordingly, e.g.:

fun Application.module() {
	...
	install(Routing) {
		upload(listOf(BearerAuthentication("secret_token"))
	}
}

fun Routing.upload(middlewares: List<Middleware<Unit, HttpStatus>>): Route {
    return post("upload") {

        val eval = middlewares.evaluate(this)
        when(eval.success) {
            true -> success(call)
            else -> call.respondText(eval.result!!.gsonify(), ContentType.Application.Json)
        }
    }
}

private fun success(call: ApplicationCall) {
	...
}