From c53ff4ca1da2dbd6ec00ea821a986238f7390c92 Mon Sep 17 00:00:00 2001
From: kashike <kashike@vq.lc>
Date: Wed, 13 Apr 2016 20:21:38 -0700
Subject: [PATCH] Add handshake event to allow plugins to handle client
 handshaking logic themselves


diff --git a/src/main/java/net/minecraft/server/HandshakeListener.java b/src/main/java/net/minecraft/server/HandshakeListener.java
index 963dbd064..d0b9c6e3d 100644
--- a/src/main/java/net/minecraft/server/HandshakeListener.java
+++ b/src/main/java/net/minecraft/server/HandshakeListener.java
@@ -73,8 +73,33 @@ public class HandshakeListener implements PacketHandshakingInListener {
                     this.b.close(chatmessage);
                 } else {
                     this.b.setPacketListener(new LoginListener(this.a, this.b));
+                // Paper start - handshake event
+                boolean proxyLogicEnabled = org.spigotmc.SpigotConfig.bungee;
+                boolean handledByEvent = false;
+                // Try and handle the handshake through the event
+                if (com.destroystokyo.paper.event.player.PlayerHandshakeEvent.getHandlerList().getRegisteredListeners().length != 0) { // Hello? Can you hear me?
+                    com.destroystokyo.paper.event.player.PlayerHandshakeEvent event = new com.destroystokyo.paper.event.player.PlayerHandshakeEvent(packethandshakinginsetprotocol.hostname, !proxyLogicEnabled);
+                    if (event.callEvent()) {
+                        // If we've failed somehow, let the client know so and go no further.
+                        if (event.isFailed()) {
+                            chatmessage = new ChatMessage(event.getFailMessage());
+                            this.b.sendPacket(new PacketLoginOutDisconnect(chatmessage));
+                            this.b.close(chatmessage);
+                            return;
+                        }
+
+                        packethandshakinginsetprotocol.hostname = event.getServerHostname();
+                        this.b.socketAddress = new java.net.InetSocketAddress(event.getSocketAddressHostname(), ((java.net.InetSocketAddress) this.b.getSocketAddress()).getPort());
+                        this.b.spoofedUUID = event.getUniqueId();
+                        this.b.spoofedProfile = gson.fromJson(event.getPropertiesJson(), com.mojang.authlib.properties.Property[].class);
+                        handledByEvent = true; // Hooray, we did it!
+                    }
+                }
+                // Don't try and handle default logic if it's been handled by the event.
+                if (!handledByEvent && proxyLogicEnabled) {
+                // Paper end
                     // Spigot Start
-                    if (org.spigotmc.SpigotConfig.bungee) {
+                //if (org.spigotmc.SpigotConfig.bungee) { // Paper - comment out, we check above!
                         String[] split = packethandshakinginsetprotocol.hostname.split("\00");
                         if ( split.length == 3 || split.length == 4 ) {
                             packethandshakinginsetprotocol.hostname = split[0];
-- 
2.24.0