From d2e95e2f183b2816ccd8ecb977ae1696b0f05e0e Mon Sep 17 00:00:00 2001
From: TwistedAsylumMC <twistedasylummc@gmail.com>
Date: Mon, 3 Oct 2022 18:18:15 +0100
Subject: [PATCH] minecraft/conn.go: Remember which packs have been ignored

---
 minecraft/conn.go | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/minecraft/conn.go b/minecraft/conn.go
index 518d8bff..3bad3761 100644
--- a/minecraft/conn.go
+++ b/minecraft/conn.go
@@ -122,6 +122,9 @@ type Conn struct {
 	// downloadResourcePack is an optional function passed to a Dial() call. If set, each resource pack received
 	// from the server will call this function to see if it should be downloaded or not.
 	downloadResourcePack func(id uuid.UUID, version string) bool
+	// ignoredResourcePacks is a slice of resource packs that are not being downloaded due to the downloadResourcePack
+	// func returning false for the specific pack.
+	ignoredResourcePacks []exemptedResourcePack
 
 	cacheEnabled bool
 
@@ -808,6 +811,8 @@ func (conn *Conn) handleClientCacheStatus(pk *packet.ClientCacheStatus) error {
 // handleResourcePacksInfo handles a ResourcePacksInfo packet sent by the server. The client responds by
 // sending the packs it needs downloaded.
 func (conn *Conn) handleResourcePacksInfo(pk *packet.ResourcePacksInfo) error {
+	conn.packMu.Lock()
+	defer conn.packMu.Unlock()
 	// First create a new resource pack queue with the information in the packet so we can download them
 	// properly later.
 	conn.packQueue = &resourcePackQueue{
@@ -824,6 +829,10 @@ func (conn *Conn) handleResourcePacksInfo(pk *packet.ResourcePacksInfo) error {
 			continue
 		}
 		if conn.downloadResourcePack != nil && !conn.downloadResourcePack(uuid.MustParse(pack.UUID), pack.Version) {
+			conn.ignoredResourcePacks = append(conn.ignoredResourcePacks, exemptedResourcePack{
+				uuid:    pack.UUID,
+				version: pack.Version,
+			})
 			continue
 		}
 		// This UUID_Version is a hack Mojang put in place.
@@ -842,6 +851,10 @@ func (conn *Conn) handleResourcePacksInfo(pk *packet.ResourcePacksInfo) error {
 			continue
 		}
 		if conn.downloadResourcePack != nil && !conn.downloadResourcePack(uuid.MustParse(pack.UUID), pack.Version) {
+			conn.ignoredResourcePacks = append(conn.ignoredResourcePacks, exemptedResourcePack{
+				uuid:    pack.UUID,
+				version: pack.Version,
+			})
 			continue
 		}
 		// This UUID_Version is a hack Mojang put in place.
@@ -909,6 +922,11 @@ func (conn *Conn) hasPack(uuid string, version string, hasBehaviours bool) bool
 	conn.packMu.Lock()
 	defer conn.packMu.Unlock()
 
+	for _, ignored := range conn.ignoredResourcePacks {
+		if ignored.uuid == uuid && ignored.version == version {
+			return true
+		}
+	}
 	for _, pack := range conn.resourcePacks {
 		if pack.UUID() == uuid && pack.Version() == version && pack.HasBehaviours() == hasBehaviours {
 			return true