remove dependency to external base62 package and create own methods in utils

go.mod

@@ -28,7 +28,6 @@ require (
 )
 
 require (
-	codeberg.org/ac/base62 v0.0.0-20210305150220-e793b546833a
 	fyne.io/fyne/v2 v2.1.4
 	github.com/c-robinson/iplib v1.0.3
 	github.com/coreos/go-iptables v0.6.0

go.sum

@@ -31,8 +31,6 @@ cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0Zeo
 cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
 cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
 cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
-codeberg.org/ac/base62 v0.0.0-20210305150220-e793b546833a h1:U6cY/g6VSiy59vuvnBU6J/eSir0qVg4BeTnCDLaX+20=
-codeberg.org/ac/base62 v0.0.0-20210305150220-e793b546833a/go.mod h1:ykEpkLT4JtH3I4Rb4gwkDsNLfgUg803qRDeIX88t3e8=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 fyne.io/fyne/v2 v2.1.4 h1:bt1+28++kAzRzPB0GM2EuSV4cnl8rXNX4cjfd8G06Rc=
 fyne.io/fyne/v2 v2.1.4/go.mod h1:p+E/Dh+wPW8JwR2DVcsZ9iXgR9ZKde80+Y+40Is54AQ=

management/server/account.go

@@ -15,7 +15,6 @@ import (
 	"sync"
 	"time"
 
-	"codeberg.org/ac/base62"
 	"github.com/eko/gocache/v3/cache"
 	cacheStore "github.com/eko/gocache/v3/store"
 	gocache "github.com/patrickmn/go-cache"
@@ -28,6 +27,7 @@ import (
 	"github.com/netbirdio/netbird/management/server/jwtclaims"
 	"github.com/netbirdio/netbird/management/server/status"
 	"github.com/netbirdio/netbird/route"
+	"github.com/netbirdio/netbird/util"
 )
 
 const (
@@ -1174,7 +1174,7 @@ func (am *DefaultAccountManager) GetAccountFromPAT(token string) (*Account, *Use
 	secret := token[len(PATPrefix) : len(PATPrefix)+PATSecretLength]
 	encodedChecksum := token[len(PATPrefix)+PATSecretLength : len(PATPrefix)+PATSecretLength+PATChecksumLength]
 
-	verificationChecksum, err := base62.Decode(encodedChecksum)
+	verificationChecksum, err := util.DecodeBase62(encodedChecksum)
 	if err != nil {
 		return nil, nil, nil, fmt.Errorf("token checksum decoding failed: %w", err)
 	}

management/server/personal_access_token.go

@@ -7,9 +7,10 @@ import (
 	"hash/crc32"
 	"time"
 
-	"codeberg.org/ac/base62"
 	b "github.com/hashicorp/go-secure-stdlib/base62"
 	"github.com/rs/xid"
+
+	"github.com/netbirdio/netbird/util"
 )
 
 const (
@@ -71,7 +72,7 @@ func generateNewToken() (string, string, error) {
 	}
 
 	checksum := crc32.ChecksumIEEE([]byte(secret))
-	encodedChecksum := base62.Encode(checksum)
+	encodedChecksum := util.EncodeBase62(checksum)
 	paddedChecksum := fmt.Sprintf("%06s", encodedChecksum)
 	plainToken := PATPrefix + secret + paddedChecksum
 	hashedToken := sha256.Sum256([]byte(plainToken))

management/server/personal_access_token_test.go

@@ -4,11 +4,13 @@ import (
 	"crypto/sha256"
 	b64 "encoding/base64"
 	"hash/crc32"
+	"math/big"
 	"strings"
 	"testing"
 
-	"codeberg.org/ac/base62"
 	"github.com/stretchr/testify/assert"
+
+	"github.com/netbirdio/netbird/util"
 )
 
 func TestPAT_GenerateToken_Hashing(t *testing.T) {
@@ -33,8 +35,10 @@ func TestPAT_GenerateToken_Checksum(t *testing.T) {
 	secret := tokenWithoutPrefix[:len(tokenWithoutPrefix)-6]
 	tokenCheckSum := tokenWithoutPrefix[len(tokenWithoutPrefix)-6:]
 
+	var i big.Int
+	i.SetString(secret, 62)
 	expectedChecksum := crc32.ChecksumIEEE([]byte(secret))
-	actualChecksum, err := base62.Decode(tokenCheckSum)
+	actualChecksum, err := util.DecodeBase62(tokenCheckSum)
 	if err != nil {
 		t.Fatal(err)
 	}

util/base62.go

@@ -0,0 +1,59 @@
+package util
+
+import (
+	"fmt"
+	"math"
+	"strings"
+)
+
+const (
+	alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+	base     = uint32(len(alphabet))
+)
+
+// EncodeBase62 encodes a uint32 value to a base62 string.
+func EncodeBase62(num uint32) string {
+	if num == 0 {
+		return string(alphabet[0])
+	}
+
+	var encoded strings.Builder
+	remainder := uint32(0)
+
+	for num > 0 {
+		remainder = num % base
+		encoded.WriteByte(alphabet[remainder])
+		num /= base
+	}
+
+	// Reverse the encoded string
+	encodedString := encoded.String()
+	reversed := reverse(encodedString)
+	return reversed
+}
+
+// DecodeBase62 decodes a base62 string to a uint32 value.
+func DecodeBase62(encoded string) (uint32, error) {
+	var decoded uint32
+	strLen := len(encoded)
+
+	for i, char := range encoded {
+		index := strings.IndexRune(alphabet, char)
+		if index < 0 {
+			return 0, fmt.Errorf("invalid character: %c", char)
+		}
+
+		decoded += uint32(index) * uint32(math.Pow(float64(base), float64(strLen-i-1)))
+	}
+
+	return decoded, nil
+}
+
+// Reverse a string.
+func reverse(s string) string {
+	runes := []rune(s)
+	for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
+		runes[i], runes[j] = runes[j], runes[i]
+	}
+	return string(runes)
+}

util/base62_test.go

@@ -0,0 +1,31 @@
+package util
+
+import (
+	"testing"
+)
+
+func TestEncodeDecode(t *testing.T) {
+	tests := []struct {
+		num uint32
+	}{
+		{0},
+		{1},
+		{42},
+		{12345},
+		{99999},
+		{123456789},
+	}
+
+	for _, tt := range tests {
+		encoded := EncodeBase62(tt.num)
+		decoded, err := DecodeBase62(encoded)
+
+		if err != nil {
+			t.Errorf("Decode error: %v", err)
+		}
+
+		if decoded != tt.num {
+			t.Errorf("Decode(%v) = %v, want %v", encoded, decoded, tt.num)
+		}
+	}
+}