initial commit

main.go

@@ -0,0 +1,106 @@
+package main
+
+import (
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+func main() {
+	// current directory or the first argument
+	root := "."
+	if len(os.Args) > 1 {
+		root = os.Args[1]
+	}
+
+	// just walk through all files and alter them
+	err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
+		if info.IsDir() {
+			return nil
+		}
+
+		if filepath.Ext(path) == ".json" {
+			alterFile(path)
+		}
+		return nil
+	})
+	if err != nil {
+		panic(err)
+	}
+}
+
+func alterFile(file string) {
+	re := regexp.MustCompile(`SkullOwner:\{Id:\\"([0-9a-f-]{36})\\"`)
+
+	// don't pass a wrong formatted file
+	json, err := ioutil.ReadFile(file)
+
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	// skip file if no match was found
+	if len(re.FindSubmatch(json)) < 2 {
+		return
+	}
+
+	intArray, err := convertUUID(string(re.FindSubmatch(json)[1]))
+	if err != nil {
+		panic(err)
+	}
+
+	// replace old UUID with int_array format
+	json = re.ReplaceAll(json, []byte("SkullOwner:{Id:"+parseUUIDArray(intArray)))
+
+	fmt.Print(file + " updated.")
+
+	// your original file is now rip
+	ioutil.WriteFile(file, json, 0666)
+}
+
+func parseUUIDArray(uuid [4]int32) string {
+	parsed := "[I;"
+
+	for i, n := range uuid {
+		parsed += fmt.Sprintf("%d", n)
+		if i < len(uuid)-1 {
+			parsed += ","
+		}
+	}
+
+	return parsed + "]"
+}
+
+func convertUUID(uuid string) ([4]int32, error) {
+	// remove "-"
+	uuid = strings.ReplaceAll(uuid, "-", "")
+
+	var uuidIntArray [4]int32
+
+	// for real, why?
+	if len(uuid) != 32 {
+		return uuidIntArray, errors.New(uuid + " is not a valid UUID")
+	}
+
+	for i := 0; i < 4; i++ {
+		slice := uuid[i*8 : i*8+8]
+
+		// convert hex to int64 because stupid
+		n, err := strconv.ParseInt(slice, 16, 64)
+		if err != nil {
+			// fuck you
+			return uuidIntArray, err
+		}
+
+		// convert int64 to int32 because stupid
+		uuidIntArray[i] = int32(n)
+	}
+
+	return uuidIntArray, nil
+}