Make sure that the time we use is always the same across servers

common/src/main/java/org/geysermc/floodgate/FloodgatePlatform.java

@@ -47,6 +47,7 @@ import org.geysermc.floodgate.link.PlayerLinkLoader;
 import org.geysermc.floodgate.module.ConfigLoadedModule;
 import org.geysermc.floodgate.module.PostInitializeModule;
 import org.geysermc.floodgate.util.PrefixCheckTask;
+import org.geysermc.floodgate.util.TimeSyncerHolder;
 
 public class FloodgatePlatform {
     private static final UUID KEY = UUID.randomUUID();
@@ -97,6 +98,8 @@ public class FloodgatePlatform {
         guice = guice.createChildInjector(new ConfigLoadedModule(config));
         PlayerLink link = guice.getInstance(PlayerLinkLoader.class).load();
 
+        TimeSyncerHolder.init();
+
         InstanceHolder.set(api, link, this.injector, packetHandlers, handshakeHandlers, KEY);
     }
 

common/src/main/java/org/geysermc/floodgate/player/FloodgatePlayerImpl.java

@@ -39,10 +39,12 @@ import org.geysermc.floodgate.api.handshake.HandshakeData;
 import org.geysermc.floodgate.api.player.FloodgatePlayer;
 import org.geysermc.floodgate.api.player.PropertyKey;
 import org.geysermc.floodgate.api.player.PropertyKey.Result;
+import org.geysermc.floodgate.time.TimeSyncer;
 import org.geysermc.floodgate.util.BedrockData;
 import org.geysermc.floodgate.util.DeviceOs;
 import org.geysermc.floodgate.util.InputMode;
 import org.geysermc.floodgate.util.LinkedPlayer;
+import org.geysermc.floodgate.util.TimeSyncerHolder;
 import org.geysermc.floodgate.util.UiProfile;
 import org.geysermc.floodgate.util.Utils;
 
@@ -77,10 +79,7 @@ public final class FloodgatePlayerImpl implements FloodgatePlayer {
      */
     @Setter private boolean login = true;
 
-    protected static FloodgatePlayerImpl from(
-            BedrockData data,
-            HandshakeData handshakeData) {
-
+    protected static FloodgatePlayerImpl from(BedrockData data, HandshakeData handshakeData) {
         FloodgateApi api = InstanceHolder.getApi();
 
         UUID javaUniqueId = Utils.getJavaUuid(data.getXuid());
@@ -109,9 +108,11 @@ public final class FloodgatePlayerImpl implements FloodgatePlayer {
     }
 
     public BedrockData toBedrockData() {
+        TimeSyncer timeSyncer = TimeSyncerHolder.get();
+
         return BedrockData.of(version, username, xuid, deviceOs.ordinal(), languageCode,
                 uiProfile.ordinal(), inputMode.ordinal(), ip, linkedPlayer, proxy, subscribeId,
-                verifyCode);
+                verifyCode, timeSyncer);
     }
 
     @Override

common/src/main/java/org/geysermc/floodgate/util/Constants.java

@@ -38,6 +38,7 @@ public final class Constants {
 
     public static final boolean DEBUG_MODE = true;
 
+    public static final String NTP_SERVER = "time.cloudflare.com";
     public static final String TIMESTAMP_DENIED_MESSAGE =
             "Something isn't right with this data." +
             " Try logging in again or contact a server administrator if the issue persists.";

common/src/main/java/org/geysermc/floodgate/util/TimeSyncerHolder.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2019-2021 GeyserMC. http://geysermc.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author GeyserMC
+ * @link https://github.com/GeyserMC/Floodgate
+ */
+
+package org.geysermc.floodgate.util;
+
+import org.geysermc.floodgate.time.TimeSyncer;
+
+public final class TimeSyncerHolder {
+    private static TimeSyncer timeSyncer;
+
+    public static void init() {
+        timeSyncer = new TimeSyncer(Constants.NTP_SERVER);
+    }
+
+    public static void set(TimeSyncer syncer) {
+        timeSyncer = syncer;
+    }
+
+    public static TimeSyncer get() {
+        return timeSyncer;
+    }
+}