A Kotlin/Ktor webserver prototype that receives a string and returns an encoded...

A Kotlin/Ktor webserver prototype that receives a string and returns an encoded string to be printed

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A Kotlin/Ktor webserver prototype that receives a string and returns an encoded string to be printed - in color - by a terminal using curl

	/* A prototype script that creates a webserver that receives a string and returns
	an encoded string to be printed - in color - by a terminal using curl.
	Dependency: Kotlin and Ktor (www.ktor.io)
	*/

	import io.ktor.application.call
	import io.ktor.response.respondBytes
	import io.ktor.routing.get
	import io.ktor.routing.routing
	import io.ktor.server.engine.embeddedServer
	import io.ktor.server.netty.Netty


	fun main() {
	/* Returns a bytestring of the value passed at the URL
	e.g. "curl http://localhost:8000/yolo" prints "yolo " to the
	console in red letters and white background. */
	val server = embeddedServer(Netty, port=8000) {
	routing {
	get("/{string}") {
	val string = call.parameters["string"] ?: ""
	call.respondBytes(addColor(string))
	}
	}
	}
	server.start(wait = true)
	}

	fun addColor(string: String) : ByteArray {
	/* Concatenates the string with the necessary ANSI code for coloring (fixed colors for now) */
	val start = byteArrayOf(32, 27, 91, 51, 49, 59, 49, 48, 55, 109) // '\033[0;31m' > RED on WHITE BG
	val end = byteArrayOf(32, 27, 91, 49, 48, 55, 109) // '\033[0m' > no color
	val new_string = string.map {
	it.toByte() // transform string into a byte array
	}
	var ret = start + new_string
	ret += end
	return ret
	}

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