up3

server/session/handler_lectern_update.go

@@ -0,0 +1,24 @@
+package session
+
+import (
+	"fmt"
+	"github.com/df-mc/dragonfly/server/block"
+	"github.com/df-mc/dragonfly/server/world"
+	"github.com/sandertv/gophertunnel/minecraft/protocol/packet"
+)
+
+// LecternUpdateHandler handles the LecternUpdate packet, sent when a player interacts with a lectern.
+type LecternUpdateHandler struct{}
+
+// Handle ...
+func (LecternUpdateHandler) Handle(p packet.Packet, _ *Session, tx *world.Tx, c Controllable) error {
+	pk := p.(*packet.LecternUpdate)
+	pos := blockPosFromProtocol(pk.Position)
+	if !canReach(c, pos.Vec3Middle()) {
+		return fmt.Errorf("block at %v is not within reach", pos)
+	}
+	if _, ok := tx.Block(pos).(block.Lectern); !ok {
+		return fmt.Errorf("block at %v is not a lectern", pos)
+	}
+	return c.TurnLecternPage(pos, int(pk.Page))
+}