Add online mode data for /ess dump (#4497)

EssentialsX/Website#60

Essentials/src/main/java/com/earth2me/essentials/Essentials.java

@@ -49,6 +49,7 @@ import net.ess3.api.IJails;
 import net.ess3.api.ISettings;
 import net.ess3.nms.refl.providers.ReflFormattedCommandAliasProvider;
 import net.ess3.nms.refl.providers.ReflKnownCommandsProvider;
+import net.ess3.nms.refl.providers.ReflOnlineModeProvider;
 import net.ess3.nms.refl.providers.ReflPersistentDataProvider;
 import net.ess3.nms.refl.providers.ReflServerStateProvider;
 import net.ess3.nms.refl.providers.ReflSpawnEggProvider;
@@ -165,6 +166,7 @@ public class Essentials extends JavaPlugin implements net.ess3.api.IEssentials {
     private transient MaterialTagProvider materialTagProvider;
     private transient SyncCommandsProvider syncCommandsProvider;
     private transient PersistentDataProvider persistentDataProvider;
+    private transient ReflOnlineModeProvider onlineModeProvider;
     private transient Kits kits;
     private transient RandomTeleport randomTeleport;
     private transient UpdateChecker updateChecker;
@@ -406,6 +408,8 @@ public class Essentials extends JavaPlugin implements net.ess3.api.IEssentials {
                 persistentDataProvider = new ReflPersistentDataProvider(this);
             }
 
+            onlineModeProvider = new ReflOnlineModeProvider();
+
             execTimer.mark("Init(Providers)");
             reload();
 
@@ -1260,6 +1264,11 @@ public class Essentials extends JavaPlugin implements net.ess3.api.IEssentials {
         return persistentDataProvider;
     }
 
+    @Override
+    public ReflOnlineModeProvider getOnlineModeProvider() {
+        return onlineModeProvider;
+    }
+
     @Override
     public PluginCommand getPluginCommand(final String cmd) {
         return this.getCommand(cmd);

Essentials/src/main/java/com/earth2me/essentials/IEssentials.java

@@ -7,6 +7,7 @@ import com.earth2me.essentials.commands.IEssentialsCommand;
 import com.earth2me.essentials.commands.PlayerNotFoundException;
 import com.earth2me.essentials.perm.PermissionsHandler;
 import com.earth2me.essentials.updatecheck.UpdateChecker;
+import net.ess3.nms.refl.providers.ReflOnlineModeProvider;
 import net.ess3.provider.ContainerProvider;
 import net.ess3.provider.FormattedCommandAliasProvider;
 import net.ess3.provider.KnownCommandsProvider;
@@ -156,5 +157,7 @@ public interface IEssentials extends Plugin {
 
     PersistentDataProvider getPersistentDataProvider();
 
+    ReflOnlineModeProvider getOnlineModeProvider();
+
     PluginCommand getPluginCommand(String cmd);
 }

Essentials/src/main/java/com/earth2me/essentials/commands/Commandessentials.java

@@ -190,6 +190,7 @@ public class Commandessentials extends EssentialsCommand {
         serverData.addProperty("bukkit-version", Bukkit.getBukkitVersion());
         serverData.addProperty("server-version", Bukkit.getVersion());
         serverData.addProperty("server-brand", Bukkit.getName());
+        serverData.addProperty("online-mode", ess.getOnlineModeProvider().getOnlineModeString());
         final JsonObject supportStatus = new JsonObject();
         final VersionUtil.SupportStatus status = VersionUtil.getServerSupportStatus();
         supportStatus.addProperty("status", status.name());

providers/NMSReflectionProvider/src/main/java/net/ess3/nms/refl/providers/ReflOnlineModeProvider.java

@@ -0,0 +1,59 @@
+package net.ess3.nms.refl.providers;
+
+import org.bukkit.Bukkit;
+
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.invoke.MethodType;
+
+public class ReflOnlineModeProvider {
+    private final MethodHandle spigotBungeeGetter;
+    private final MethodHandle paperBungeeGetter;
+    private final boolean fancyPaperCheck;
+
+    public ReflOnlineModeProvider() {
+        MethodHandle spigotBungeeGetter = null;
+        MethodHandle paperBungeeGetter = null;
+        boolean fancyCheck = false;
+        try {
+            final MethodHandles.Lookup lookup = MethodHandles.lookup();
+            spigotBungeeGetter = lookup.findStaticGetter(Class.forName("org.spigotmc.SpigotConfig"), "bungee", boolean.class);
+            final Class<?> paperConfig = Class.forName("com.destroystokyo.paper.PaperConfig");
+            paperBungeeGetter = lookup.findStaticGetter(paperConfig, "bungeeOnlineMode", boolean.class);
+            paperBungeeGetter = lookup.findStatic(paperConfig, "isProxyOnlineMode", MethodType.methodType(boolean.class));
+            fancyCheck = true;
+        } catch (Throwable ignored) {
+        }
+        this.spigotBungeeGetter = spigotBungeeGetter;
+        this.paperBungeeGetter = paperBungeeGetter;
+        this.fancyPaperCheck = fancyCheck;
+    }
+
+    public String getOnlineModeString() {
+        if (spigotBungeeGetter == null) {
+            return Bukkit.getOnlineMode() ? "Online Mode" : "Offline Mode";
+        }
+
+        try {
+            if (Bukkit.getOnlineMode()) {
+                return "Online Mode";
+            }
+
+            if (fancyPaperCheck) {
+                if ((boolean) paperBungeeGetter.invoke()) {
+                    // Could be Velocity or Bungee, so do not specify.
+                    return "Proxy Mode";
+                }
+                return "Offline Mode";
+            }
+
+            if ((boolean) spigotBungeeGetter.invoke() && (paperBungeeGetter == null || (boolean) paperBungeeGetter.invoke())) {
+                return "Bungee Mode";
+            }
+
+            return "Offline Mode";
+        } catch (Throwable ignored) {
+            return "Unknown";
+        }
+    }
+}