Implement chat message signing for 1.19.1+ (#5030)

**Known issue: this inadvertently reformats `/minecraft:tell`. There's not much we can do about this in 2.19.x.**

This commit refactors EssentialsX Chat in order to support chat previews and signed chat messages in 1.19.1+.

Author: mdcfe

Essentials/src/main/java/net/ess3/api/events/LocalChatSpyEvent.java

@@ -52,8 +52,8 @@ public void setMessage(final String message) {
     }
 
     /**
-     * Gets the format to use to display this chat message. When this event finishes execution, the first format
-     * parameter is the {@link Player#getDisplayName()} and the second parameter is {@link #getMessage()}
+     * Gets the format to use to display this chat message to spy recipients. When this event finishes execution, the
+     * first format parameter is the {@link Player#getDisplayName()} and the second parameter is {@link #getMessage()}
      *
      * @return {@link String#format(String, Object...)} compatible format string
      */
@@ -62,8 +62,8 @@ public String getFormat() {
     }
 
     /**
-     * Sets the format to use to display this chat message. When this event finishes execution, the first format
-     * parameter is the {@link Player#getDisplayName()} and the second parameter is {@link #getMessage()}
+     * Sets the format to use to display this chat message to spy recipients. When this event finishes execution, the
+     * first format parameter is the {@link Player#getDisplayName()} and the second parameter is {@link #getMessage()}
      *
      * @param format {@link String#format(String, Object...)} compatible format string
      * @throws IllegalFormatException if the underlying API throws the exception

Essentials/src/main/resources/messages.properties

@@ -314,6 +314,7 @@ enderchestCommandUsage2=/<command> <player>
 enderchestCommandUsage2Description=Opens the ender chest of the target player
 errorCallingCommand=Error calling the command /{0}
 errorWithMessage=\u00a7cError\:\u00a74 {0}
+essChatNoSecureMsg=EssentialsX Chat version {0} does not support secure chat on this server software. Update EssentialsX, and if this issue persists, inform the developers.
 essentialsCommandDescription=Reloads essentials.
 essentialsCommandUsage=/<command>
 essentialsCommandUsage1=/<command> reload

EssentialsChat/src/main/java/com/earth2me/essentials/chat/ChatStore.java

@@ -1,17 +1,16 @@
 package com.earth2me.essentials.chat;
 
+import com.earth2me.essentials.Essentials;
 import com.earth2me.essentials.EssentialsLogger;
+import com.earth2me.essentials.chat.processing.LegacyChatHandler;
+import com.earth2me.essentials.chat.processing.SignedChatHandler;
 import com.earth2me.essentials.metrics.MetricsWrapper;
 import net.ess3.api.IEssentials;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandSender;
-import org.bukkit.event.player.AsyncPlayerChatEvent;
 import org.bukkit.plugin.PluginManager;
 import org.bukkit.plugin.java.JavaPlugin;
 
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.Map;
 import java.util.logging.Level;
 
 import static com.earth2me.essentials.I18n.tl;
@@ -33,14 +32,13 @@ public void onEnable() {
             return;
         }
 
-        final Map<AsyncPlayerChatEvent, ChatStore> chatStore = Collections.synchronizedMap(new HashMap<>());
-
-        final EssentialsChatPlayerListenerLowest playerListenerLowest = new EssentialsChatPlayerListenerLowest(getServer(), ess, this, chatStore);
-        final EssentialsChatPlayerListenerNormal playerListenerNormal = new EssentialsChatPlayerListenerNormal(getServer(), ess, this, chatStore);
-        final EssentialsChatPlayerListenerHighest playerListenerHighest = new EssentialsChatPlayerListenerHighest(getServer(), ess, this, chatStore);
-        pluginManager.registerEvents(playerListenerLowest, this);
-        pluginManager.registerEvents(playerListenerNormal, this);
-        pluginManager.registerEvents(playerListenerHighest, this);
+        final SignedChatHandler signedHandler = new SignedChatHandler((Essentials) ess, this);
+        if (signedHandler.tryRegisterListeners()) {
+            getLogger().info("Secure signed chat and previews are enabled.");
+        } else {
+            final LegacyChatHandler legacyHandler = new LegacyChatHandler((Essentials) ess, this);
+            legacyHandler.registerListeners();
+        }
 
         if (metrics == null) {
             metrics = new MetricsWrapper(this, 3814, false);