Port metadata code to Kotlin

src/main/kotlin/link/infra/packwiz/installer/request/HandlerManager.kt

@@ -0,0 +1,47 @@
+package link.infra.packwiz.installer.request
+
+import link.infra.packwiz.installer.metadata.SpaceSafeURI
+import link.infra.packwiz.installer.request.handlers.RequestHandlerGithub
+import link.infra.packwiz.installer.request.handlers.RequestHandlerHTTP
+import okio.Source
+
+object HandlerManager {
+
+	private val handlers: List<IRequestHandler> = listOf(
+			RequestHandlerGithub(),
+			RequestHandlerHTTP()
+	)
+
+	@JvmStatic
+	fun getNewLoc(base: SpaceSafeURI?, loc: SpaceSafeURI?): SpaceSafeURI? {
+		if (loc == null) {
+			return null
+		}
+		val dest = base?.run { resolve(loc) } ?: loc
+		for (handler in handlers) with (handler) {
+			if (matchesHandler(dest)) {
+				return getNewLoc(dest)
+			}
+		}
+		return dest
+	}
+
+	// TODO: What if files are read multiple times??
+	// Zip handler discards once read, requesting multiple times on other handlers would cause multiple downloads
+	// Caching system? Copy from already downloaded files?
+
+	@JvmStatic
+	@Throws(Exception::class)
+	fun getFileSource(loc: SpaceSafeURI): Source {
+		for (handler in handlers) {
+			if (handler.matchesHandler(loc)) {
+				return handler.getFileSource(loc) ?: throw Exception("Couldn't find URI: $loc")
+			}
+		}
+		throw Exception("No handler available for URI: $loc")
+	}
+
+	// TODO: github toml resolution?
+	// e.g. https://github.com/comp500/Demagnetize -> demagnetize.toml
+	// https://github.com/comp500/Demagnetize/blob/master/demagnetize.toml
+}