Call PaperServerListPingEvent for legacy pings

paper-server/src/main/java/com/destroystokyo/paper/network/PaperLegacyStatusClient.java

@@ -0,0 +1,75 @@
+package com.destroystokyo.paper.network;
+
+import com.destroystokyo.paper.event.server.PaperServerListPingEvent;
+import net.kyori.adventure.text.serializer.plain.PlainTextComponentSerializer;
+import net.minecraft.ChatFormatting;
+import net.minecraft.server.MinecraftServer;
+import org.apache.commons.lang3.StringUtils;
+
+import java.net.InetSocketAddress;
+
+import javax.annotation.Nullable;
+
+public final class PaperLegacyStatusClient implements StatusClient {
+
+    private final InetSocketAddress address;
+    private final int protocolVersion;
+    @Nullable private final InetSocketAddress virtualHost;
+
+    private PaperLegacyStatusClient(InetSocketAddress address, int protocolVersion, @Nullable InetSocketAddress virtualHost) {
+        this.address = address;
+        this.protocolVersion = protocolVersion;
+        this.virtualHost = virtualHost;
+    }
+
+    @Override
+    public InetSocketAddress getAddress() {
+        return this.address;
+    }
+
+    @Override
+    public int getProtocolVersion() {
+        return this.protocolVersion;
+    }
+
+    @Nullable
+    @Override
+    public InetSocketAddress getVirtualHost() {
+        return this.virtualHost;
+    }
+
+    @Override
+    public boolean isLegacy() {
+        return true;
+    }
+
+    public static PaperServerListPingEvent processRequest(MinecraftServer server,
+            InetSocketAddress address, int protocolVersion, @Nullable InetSocketAddress virtualHost) {
+
+        PaperServerListPingEvent event =  new PaperServerListPingEventImpl(server,
+                new PaperLegacyStatusClient(address, protocolVersion, virtualHost), Byte.MAX_VALUE, null);
+        server.server.getPluginManager().callEvent(event);
+
+        if (event.isCancelled()) {
+            return null;
+        }
+
+        return event;
+    }
+
+    @SuppressWarnings("deprecation") // Valid as this is the legacy status client
+    public static String getMotd(PaperServerListPingEvent event) {
+        return getFirstLine(event.getMotd());
+    }
+
+    public static String getUnformattedMotd(PaperServerListPingEvent event) {
+        // Strip color codes and all other occurrences of the color char (because it's used as delimiter)
+        return getFirstLine(StringUtils.remove(PlainTextComponentSerializer.plainText().serialize(event.motd()), ChatFormatting.PREFIX_CODE));
+    }
+
+    private static String getFirstLine(String s) {
+        int pos = s.indexOf('\n');
+        return pos >= 0 ? s.substring(0, pos) : s;
+    }
+
+}