Add wss support

src/commonMain/kotlin/de/kif/common/DateFormat.kt

@@ -31,7 +31,7 @@ fun formatTimeDiff(time: Long, now: Long): String {
         hours > 1L -> {
             val nowHour = DateFormat("HH")
                 .withLocale(KlockLocale.german)
-                .format(now).toInt() ?: 0
+                .format(now).toIntOrNull() ?: 0
 
             val ht = DateFormat("HH:mm")
                 .withLocale(KlockLocale.german)

src/jsMain/kotlin/de/kif/frontend/WebSocketClient.kt

@@ -11,8 +11,11 @@ import org.w3c.dom.events.Event
 import kotlin.browser.window
 
 class WebSocketClient() {
-    val prefix = js("prefix")
-    private val url = "ws://${window.location.host}$prefix/"
+    private val prefix = js("prefix")
+
+    private val useSsl = "https" in window.location.protocol
+    private val wsProtocol = if (useSsl) "wss" else "ws"
+    private val url = "$wsProtocol://${window.location.host}$prefix/websocket"
 
     private lateinit var ws: WebSocket
     private var reconnect = false

src/jvmMain/kotlin/de/kif/backend/util/PushService.kt

@@ -28,7 +28,7 @@ object PushService {
 }
 
 fun Route.pushService() {
-    webSocket("/") {
+    webSocket("/websocket") {
         PushService.clients += this
 
         try {