RequestUtils.kt

package biz.radioteria.web.server

import biz.radioteria.web.request.Request
import biz.radioteria.web.request.RequestMethod
import com.sun.net.httpserver.HttpExchange

fun fromHttpExchange(httpExchange: HttpExchange): Request {
    val method = httpExchange.requestMethod
    val path = normalizedRequestPath(httpExchange.requestURI.path)
    val query = httpExchange.requestURI.query ?: ""

    return Request(RequestMethod.valueOf(method), path, queryStringToMap(query))
}

fun queryStringToMap(queryString: String): Map<String, String> {
    if (queryString.isNullOrBlank()) {
        return mapOf()
    }

    return queryString.split("&").fold(emptyMap()) {
        map, item -> map + hashMapOf(item.splitAt("="))
    }
}

fun normalizedRequestPath(requestPath: String): String {
    return if (requestPath.equals("/")) requestPath else requestPath.substring(1)
}

fun String.splitAt(substring: String): Pair<String, String> {
    with(this.split(substring, limit = 2)) {
        return if (this.size < 2) Pair(this[0], "") else Pair(this[0], this[1])
    }
}