Add a POST /user/:id/leave, this will be used to track whether a player is currently on the network or not.

src/main/java/net/frozenorb/apiv3/APIv3.java

@@ -219,6 +219,7 @@ public final class APIv3 {
         post("/user/:id/grant",  new POSTUserGrant(), gson::toJson);
         post("/user/:id/punish", new POSTUserPunish(), gson::toJson);
         post("/user/:id/login", new POSTUserLogin(), gson::toJson);
+        post("/user/:id/leave", new POSTUserLeave(), gson::toJson);
         post("/user/:id/notify", new POSTUserNotify(), gson::toJson);
         post("/user/:id/register", new POSTUserRegister(), gson::toJson);
         post("/user/:id/setupTOTP", new POSTUserSetupTOTP(), gson::toJson);

src/main/java/net/frozenorb/apiv3/models/User.java

@@ -31,6 +31,7 @@ public final class  User {
     @Getter private String lastSeenOn;
     @Getter private Date lastSeenAt;
     @Getter private Date firstSeenAt;
+    @Getter private boolean online;
 
     public static User byId(String id) {
         try {
@@ -140,7 +141,17 @@ public final class  User {
 
     public void seenOnServer(Server server) {
         this.lastSeenOn = server.getId();
+
+        if (!online) {
+            this.lastSeenAt = new Date();
+        }
+
+        this.online = true;
+    }
+
+    public void leftServer() {
         this.lastSeenAt = new Date();
+        this.online = false;
     }
 
     public void updateUsername(String username) {

src/main/java/net/frozenorb/apiv3/routes/users/POSTUserLeave.java

@@ -0,0 +1,33 @@
+package net.frozenorb.apiv3.routes.users;
+
+import net.frozenorb.apiv3.APIv3;
+import net.frozenorb.apiv3.actors.Actor;
+import net.frozenorb.apiv3.actors.ActorType;
+import net.frozenorb.apiv3.models.User;
+import net.frozenorb.apiv3.utils.ErrorUtils;
+import spark.Request;
+import spark.Response;
+import spark.Route;
+
+public class POSTUserLeave implements Route {
+
+    @Override
+    public Object handle(Request req, Response res) throws Exception {
+        User user = User.byId(req.params("id"));
+        Actor actor = req.attribute("actor");
+
+        if (actor.getType() != ActorType.SERVER) {
+            return ErrorUtils.serverOnly();
+        }
+
+        if (user == null) {
+            return ErrorUtils.notFound("User", req.params("id"));
+        }
+
+        user.leftServer();
+
+        APIv3.getDatastore().save(user);
+        return user;
+    }
+
+}