Warn if FastLogin doesn't login authenticated players

Related #351

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/hook/AuthMeHook.java

@@ -42,6 +42,7 @@ public class AuthMeHook implements AuthPlugin<Player>, Listener {
     @Override
     public boolean forceLogin(Player player) {
         if (AuthMeApi.getInstance().isAuthenticated(player)) {
+            plugin.getLog().warn(ALREADY_AUTHENTICATED, player);
             return false;
         }
 

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/hook/LogItHook.java

@@ -1,5 +1,6 @@
 package com.github.games647.fastlogin.bukkit.hook;
 
+import com.github.games647.fastlogin.bukkit.FastLoginBukkit;
 import com.github.games647.fastlogin.core.hooks.AuthPlugin;
 
 import io.github.lucaseasedup.logit.CancelledState;
@@ -22,11 +23,21 @@ import org.bukkit.entity.Player;
  */
 public class LogItHook implements AuthPlugin<Player> {
 
+    private final FastLoginBukkit plugin;
+
+    public LogItHook(FastLoginBukkit plugin) {
+        this.plugin = plugin;
+    }
+
     @Override
     public boolean forceLogin(Player player) {
         SessionManager sessionManager = LogItCore.getInstance().getSessionManager();
-        return sessionManager.isSessionAlive(player)
+        if (sessionManager.isSessionAlive(player)) {
-                || sessionManager.startSession(player) == CancelledState.NOT_CANCELLED;
+            plugin.getLog().warn(ALREADY_AUTHENTICATED, player);
+            return false;
+        }
+
+        return sessionManager.startSession(player) == CancelledState.NOT_CANCELLED;
     }
 
     @Override

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/hook/LoginSecurityHook.java

@@ -30,6 +30,11 @@ public class LoginSecurityHook implements AuthPlugin<Player> {
     @Override
     public boolean forceLogin(Player player) {
         PlayerSession session = LoginSecurity.getSessionManager().getPlayerSession(player);
+        if (session.isAuthorized()) {
+            plugin.getLog().warn(ALREADY_AUTHENTICATED, player);
+            return true;
+        }
+
         return session.isAuthorized()
                 || session.performAction(new LoginAction(AuthService.PLUGIN, plugin)).isSuccess();
     }

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/hook/UltraAuthHook.java

@@ -34,7 +34,7 @@ public class UltraAuthHook implements AuthPlugin<Player> {
         //not thread-safe
         Future<Boolean> future = Bukkit.getScheduler().callSyncMethod(plugin, () -> {
             if (UltraAuthAPI.isAuthenticated(player)) {
-                return true;
+                return false;
             }
 
             UltraAuthAPI.authenticatedPlayer(player);

bukkit/src/main/java/com/github/games647/fastlogin/bukkit/hook/xAuthHook.java

@@ -35,7 +35,8 @@ public class xAuthHook implements AuthPlugin<Player> {
             xAuthPlayer xAuthPlayer = xAuthPlugin.getPlayerManager().getPlayer(player);
             if (xAuthPlayer != null) {
                 if (xAuthPlayer.isAuthenticated()) {
-                    return true;
+                    plugin.getLog().warn("Player {} is already authenticated", player);
+                    return false;
                 }
 
                 //we checked that the player is premium (paid account)

core/src/main/java/com/github/games647/fastlogin/core/hooks/AuthPlugin.java

@@ -8,6 +8,8 @@ package com.github.games647.fastlogin.core.hooks;
  */
 public interface AuthPlugin<P> {
 
+    String ALREADY_AUTHENTICATED = "Player {} is already authenticated. Cancelling force login.";
+
     /**
      * Login the premium (paid account) player after the player joined successfully the server.
      *