up3

server/internal/packbuilder/resource_pack.go

@@ -0,0 +1,52 @@
+package packbuilder
+
+import (
+	_ "embed"
+	"os"
+
+	"github.com/df-mc/dragonfly/server/world"
+	"github.com/sandertv/gophertunnel/minecraft/resource"
+	"golang.org/x/mod/sumdb/dirhash"
+)
+
+//go:embed pack_icon.png
+var packIcon []byte
+
+// BuildResourcePack builds a resource pack based on custom features that have been registered to the server.
+// It creates a UUID based on the hash of the directory so the client will only be prompted to download it
+// once it is changed.
+func BuildResourcePack(reg world.BlockRegistry) (*resource.Pack, bool) {
+	dir, err := os.MkdirTemp("", "dragonfly_resource_pack-")
+	if err != nil {
+		panic(err)
+	}
+	defer os.RemoveAll(dir)
+
+	var assets int
+	var lang []string
+
+	itemCount, itemLang := buildItems(dir)
+	assets += itemCount
+	lang = append(lang, itemLang...)
+
+	blockCount, blockLang := buildBlocks(reg, dir)
+	assets += blockCount
+	lang = append(lang, blockLang...)
+
+	if assets > 0 {
+		buildLanguageFile(dir, lang)
+		if err := os.WriteFile(dir+"/pack_icon.png", packIcon, 0666); err != nil {
+			panic(err)
+		}
+		hash, err := dirhash.HashDir(dir, "", dirhash.Hash1)
+		if err != nil {
+			panic(err)
+		}
+		var header, module [16]byte
+		copy(header[:], hash)
+		copy(module[:], hash[16:])
+		buildManifest(dir, header, module)
+		return resource.MustReadPath(dir), true
+	}
+	return nil, false
+}