feat(websocket)!: Implement WebSocket connection and event handling (#82)

Co-authored-by: LQ63 <lkhermann@web.de>
Reviewed-on: #82
Co-authored-by: Janis <janis.e.20@gmx.de>
Co-committed-by: Janis <janis.e.20@gmx.de>

knockoutwhistweb/app/controllers/WebsocketController.scala

@@ -0,0 +1,45 @@
+package controllers
+
+
+import auth.AuthAction
+import logic.PodManager
+import logic.user.SessionManager
+import model.sessions.{UserSession, UserWebsocketActor}
+import org.apache.pekko.actor.{ActorRef, ActorSystem, Props}
+import org.apache.pekko.stream.Materializer
+import play.api.*
+import play.api.libs.streams.ActorFlow
+import play.api.mvc.*
+
+import javax.inject.*
+
+
+@Singleton
+class WebsocketController @Inject()(
+                                     cc: ControllerComponents,
+                                     val sessionManger: SessionManager,
+                                   )(implicit system: ActorSystem, mat: Materializer) extends AbstractController(cc) {
+
+  def socket(): WebSocket = WebSocket.accept[String, String] { request =>
+    val session = request.cookies.get("sessionId")
+    if (session.isEmpty) throw new Exception("No session cookie found")
+    val userOpt = sessionManger.getUserBySession(session.get.value)
+    if (userOpt.isEmpty) throw new Exception("Invalid session")
+    val user = userOpt.get
+    val game = PodManager.identifyGameOfUser(user)
+    if (game.isEmpty) throw new Exception("User is not in a game")
+    val userSession = game.get.getUserSession(user.id)
+    ActorFlow.actorRef { out =>
+      println("Connect received")
+      KnockOutWebSocketActorFactory.create(out, userSession)
+    }
+  }
+
+  object KnockOutWebSocketActorFactory {
+    def create(out: ActorRef, userSession: UserSession): Props = {
+      Props(new UserWebsocketActor(out, userSession))
+    }
+  }
+
+
+}