Added premium UUID support (Fixes #5)

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/FastLoginBukkit.java

@@ -154,7 +154,7 @@ public class FastLoginBukkit extends JavaPlugin {
 
     /**
      * Gets the auth plugin hook in order to interact with the plugins.
-     * This can be null if no supporting auth plugin was found
+     * This can be null if no supporting auth plugin was found.
      *
      * @return interface to any supported auth plugin
      */

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/MojangApiConnector.java

@@ -7,6 +7,7 @@ import java.io.IOException;
 import java.io.InputStreamReader;
 import java.net.HttpURLConnection;
 import java.net.URL;
+import java.util.UUID;
 import java.util.logging.Level;
 import java.util.regex.Pattern;
 
@@ -68,6 +69,7 @@ public class MojangApiConnector {
                 //http://wiki.vg/Protocol_Encryption#Server
                 JSONObject userData = (JSONObject) JSONValue.parseWithException(line);
                 String uuid = (String) userData.get("id");
+                session.setUuid(parseId(uuid));
 
                 JSONArray properties = (JSONArray) userData.get("properties");
                 JSONObject skinProperty = (JSONObject) properties.get(0);
@@ -90,6 +92,14 @@ public class MojangApiConnector {
         return false;
     }
 
+    private UUID parseId(String withoutDashes) {
+        return UUID.fromString(withoutDashes.substring(0, 8)
+                + "-" + withoutDashes.substring(8, 12)
+                + "-" + withoutDashes.substring(12, 16)
+                + "-" + withoutDashes.substring(16, 20)
+                + "-" + withoutDashes.substring(20, 32));
+    }
+
     private HttpURLConnection getConnection(String url) throws IOException {
         HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
         connection.setConnectTimeout(TIMEOUT);

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/PlayerSession.java

@@ -2,6 +2,8 @@ package com.github.games647.fastlogin.bukkit;
 
 import com.comphenix.protocol.wrappers.WrappedSignedProperty;
 
+import java.util.UUID;
+
 import org.apache.commons.lang.ArrayUtils;
 
 /**
@@ -15,6 +17,7 @@ public class PlayerSession {
     private final String serverId;
     private final byte[] verifyToken;
 
+    private UUID uuid;
     private WrappedSignedProperty skinProperty;
     private boolean verified;
     private boolean registered;
@@ -110,6 +113,25 @@ public class PlayerSession {
         this.verified = verified;
     }
 
+    /**
+     * Get the premium UUID of this player
+     *
+     * @return the premium UUID or null if not fetched
+     */
+    public synchronized UUID getUuid() {
+        return uuid;
+    }
+
+
+    /**
+     * Set the online UUID if it's fetched
+     *
+     * @param uuid premium UUID
+     */
+    public synchronized void setUuid(UUID uuid) {
+        this.uuid = uuid;
+    }
+
     /**
      * Get whether the player has a premium (paid account) account
      * and valid session

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/EncryptionPacketListener.java

@@ -105,6 +105,7 @@ public class EncryptionPacketListener extends PacketAdapter {
             plugin.getLogger().log(Level.FINE, "Player {0} has a verified premium account", username);
 
             session.setVerified(true);
+            setPremiumUUID(session, player);
             receiveFakeStartPacket(username, player);
         } else {
             //user tried to fake a authentication
@@ -117,6 +118,20 @@ public class EncryptionPacketListener extends PacketAdapter {
         packetEvent.setCancelled(true);
     }
 
+    private void setPremiumUUID(PlayerSession session, Player player) {
+        UUID uuid = session.getUuid();
+        if (plugin.getConfig().getBoolean("premiumUuid") && uuid != null) {
+            try {
+                Object networkManager = getNetworkManager(player);
+                //https://github.com/bergerkiller/CraftSource/blob/master/net.minecraft.server/NetworkManager.java#L69
+                Field spoofField = FuzzyReflection.fromObject(networkManager).getFieldByType("spoofedUUID", UUID.class);
+                spoofField.set(networkManager, uuid);
+            } catch (ReflectiveOperationException reflectiveOperationException) {
+                plugin.getLogger().log(Level.SEVERE, "Error setting premium uuid", reflectiveOperationException);
+            }
+        }
+    }
+
     private boolean checkVerifyToken(PlayerSession session, PrivateKey privateKey, PacketEvent packetEvent) {
         byte[] requestVerify = session.getVerifyToken();
         //encrypted verify token

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/ProtcolSupportListener.java

@@ -59,7 +59,9 @@ public class ProtcolSupportListener implements Listener {
             PlayerSession playerSession = new PlayerSession(playerName, null, null);
             playerSession.setRegistered(registered);
             plugin.getSessions().put(address.toString(), playerSession);
-//            loginStartEvent.setUseOnlineModeUUID(true);
+            if (plugin.getConfig().getBoolean("premiumUuid")) {
+                loginStartEvent.setUseOnlineModeUUID(true);
+            }
         }
     }
 }

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/listener/StartPacketListener.java

@@ -76,7 +76,7 @@ public class StartPacketListener extends PacketAdapter {
             BukkitAuthPlugin authPlugin = plugin.getAuthPlugin();
             if (plugin.getEnabledPremium().contains(username)) {
                 enablePremiumLogin(username, sessionKey, player, packetEvent, true);
-            } else if (plugin.getConfig().getBoolean("autologin")
+            } else if (plugin.getConfig().getBoolean("autoRegister")
                     && authPlugin != null && !plugin.getAuthPlugin().isRegistered(username)) {
                 enablePremiumLogin(username, sessionKey, player, packetEvent, false);
                 plugin.getEnabledPremium().add(username);

bukkit/src/main/resources/config.yml

@@ -16,4 +16,23 @@
 # the player just disconnect and sees the message: 'bad login'
 # There is no way to change this message
 # For more information: https://github.com/games647/FastLogin#why-do-players-have-to-invoke-a-command
-autoRegister: false
+autoRegister: false
+
+# If this plugin detected that a player has a premium, it can also set the associated
+# uuid from that account.
+#
+# So if the players changes their usernames, they will still have
+# the same playerdata (inventory, permissions, ...)
+#
+# Warning: This also means that the UUID will be different if the player is connecting
+# through a offline mode connection. This **could** cause plugin compatibility issues.
+#
+# This is a example and doesn't apply for every plugin.
+# Example: If you want to ban players who aren't online at the moment, the ban plugin will look
+# after a offline uuid associated to the player, because the server is in offline mode. Then the premium
+# players could still join the server, because they have different UUID.
+#
+# Moreover you may want to convert the offline UUID to a premium UUID. This will ensure that the player
+# will have the same inventory, permissions, ... if they switched to premium authentification from offline/cracked
+# authentification.
+premiumUuid: false