Add PlayerHandshakeEvent which allows changing of versions and online mode status amongst other things.

api/src/main/java/net/md_5/bungee/api/event/PlayerHandshakeEvent.java

@@ -0,0 +1,34 @@
+package net.md_5.bungee.api.event;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import lombok.ToString;
+import net.md_5.bungee.api.connection.PendingConnection;
+import net.md_5.bungee.protocol.packet.Packet2Handshake;
+import net.md_5.bungee.api.plugin.Event;
+
+/**
+ * Event called to represent a player first making their presence and username
+ * known.
+ */
+@Data
+@ToString(callSuper = false)
+@EqualsAndHashCode(callSuper = false)
+public class PlayerHandshakeEvent extends Event
+{
+
+    /**
+     * Connection attempting to login.
+     */
+    private final PendingConnection connection;
+    /**
+     * The handshake.
+     */
+    private final Packet2Handshake handshake;
+
+    public PlayerHandshakeEvent(PendingConnection connection, Packet2Handshake handshake)
+    {
+        this.connection = connection;
+        this.handshake = handshake;
+    }
+}

proxy/src/main/java/net/md_5/bungee/EncryptionUtil.java

@@ -40,9 +40,9 @@ public class EncryptionUtil
         }
     }
 
-    public static PacketFDEncryptionRequest encryptRequest()
+    public static PacketFDEncryptionRequest encryptRequest(boolean onlinemode)
     {
-        String hash = ( BungeeCord.getInstance().config.isOnlineMode() ) ? Long.toString( random.nextLong(), 16 ) : "-";
+        String hash = ( onlinemode ) ? Long.toString( random.nextLong(), 16 ) : "-";
         byte[] pubKey = keys.getPublic().getEncoded();
         byte[] verify = new byte[ 4 ];
         random.nextBytes( verify );

proxy/src/main/java/net/md_5/bungee/connection/InitialHandler.java

@@ -52,6 +52,7 @@ import net.md_5.bungee.protocol.packet.PacketFDEncryptionRequest;
 import net.md_5.bungee.protocol.packet.PacketFEPing;
 import net.md_5.bungee.protocol.packet.PacketFFKick;
 import net.md_5.bungee.api.AbstractReconnectHandler;
+import net.md_5.bungee.api.event.PlayerHandshakeEvent;
 
 @RequiredArgsConstructor
 public class InitialHandler extends PacketHandler implements PendingConnection
@@ -80,6 +81,8 @@ public class InitialHandler extends PacketHandler implements PendingConnection
             ch.write( packet );
         }
     };
+    @Getter
+    private boolean onlineMode = BungeeCord.getInstance().config.isOnlineMode();
     private ScheduledFuture<?> pingFuture;
     private InetSocketAddress vHost;
     private byte version = -1;
@@ -198,6 +201,8 @@ public class InitialHandler extends PacketHandler implements PendingConnection
         this.vHost = new InetSocketAddress( handshake.getHost(), handshake.getPort() );
         bungee.getLogger().log( Level.INFO, "{0} has connected", this );
 
+        bungee.getPluginManager().callEvent( new PlayerHandshakeEvent( InitialHandler.this, handshake ) );
+
         if ( handshake.getProtocolVersion() > Vanilla.PROTOCOL_VERSION )
         {
             disconnect( bungee.getTranslation( "outdated_server" ) );
@@ -220,7 +225,7 @@ public class InitialHandler extends PacketHandler implements PendingConnection
         }
 
         // If offline mode and they are already on, don't allow connect
-        if ( !BungeeCord.getInstance().config.isOnlineMode() && bungee.getPlayer( handshake.getUsername() ) != null )
+        if ( !isOnlineMode() && bungee.getPlayer( handshake.getUsername() ) != null )
         {
             disconnect( bungee.getTranslation( "already_connected" ) );
             return;
@@ -228,7 +233,8 @@ public class InitialHandler extends PacketHandler implements PendingConnection
 
         unsafe().sendPacket( PacketConstants.I_AM_BUNGEE );
         unsafe().sendPacket( PacketConstants.FORGE_MOD_REQUEST );
-        unsafe().sendPacket( request = EncryptionUtil.encryptRequest() );
+
+        unsafe().sendPacket( request = EncryptionUtil.encryptRequest( this.onlineMode ) );
         thisState = State.ENCRYPT;
     }
 
@@ -241,7 +247,7 @@ public class InitialHandler extends PacketHandler implements PendingConnection
         Cipher decrypt = EncryptionUtil.getCipher( Cipher.DECRYPT_MODE, sharedKey );
         ch.addBefore( PipelineUtils.PACKET_DECODE_HANDLER, PipelineUtils.DECRYPT_HANDLER, new CipherDecoder( decrypt ) );
 
-        if ( BungeeCord.getInstance().config.isOnlineMode() )
+        if ( this.onlineMode )
         {
             String encName = URLEncoder.encode( InitialHandler.this.getName(), "UTF-8" );
 
@@ -402,6 +408,12 @@ public class InitialHandler extends PacketHandler implements PendingConnection
         return unsafe;
     }
 
+    public void setOnlineMode(boolean onlineMode)
+    {
+        Preconditions.checkState( thisState == State.HANDSHAKE, "Can only set online mode status whilst handshaking" );
+        this.onlineMode = onlineMode;
+    }
+
     @Override
     public String toString()
     {