fix qr-code generation for large configurations (#374)

go.mod

@@ -21,6 +21,7 @@ require (
 	github.com/vishvananda/netlink v1.3.0
 	github.com/xhit/go-simple-mail/v2 v2.16.0
 	github.com/yeqown/go-qrcode/v2 v2.2.5
+	github.com/yeqown/go-qrcode/writer/compressed v1.0.1
 	golang.org/x/crypto v0.34.0
 	golang.org/x/oauth2 v0.26.0
 	golang.org/x/sys v0.30.0

go.sum

@@ -284,6 +284,8 @@ github.com/xhit/go-simple-mail/v2 v2.16.0 h1:ouGy/Ww4kuaqu2E2UrDw7SvLaziWTB60ICL
 github.com/xhit/go-simple-mail/v2 v2.16.0/go.mod h1:b7P5ygho6SYE+VIqpxA6QkYfv4teeyG4MKqB3utRu98=
 github.com/yeqown/go-qrcode/v2 v2.2.5 h1:HCOe2bSjkhZyYoyyNaXNzh4DJZll6inVJQQw+8228Zk=
 github.com/yeqown/go-qrcode/v2 v2.2.5/go.mod h1:uHpt9CM0V1HeXLz+Wg5MN50/sI/fQhfkZlOM+cOTHxw=
+github.com/yeqown/go-qrcode/writer/compressed v1.0.1 h1:0el6zOppx3oPiYWMUJWRYGvxWYh8MDmUU0j3rSWGWlI=
+github.com/yeqown/go-qrcode/writer/compressed v1.0.1/go.mod h1:BJScsGUIKM+eg0CCLCcVaDTaclDM1IEXtq2r8qQnDKk=
 github.com/yeqown/reedsolomon v1.0.0 h1:x1h/Ej/uJnNu8jaX7GLHBWmZKCAWjEJTetkqaabr4B0=
 github.com/yeqown/reedsolomon v1.0.0/go.mod h1:P76zpcn2TCuL0ul1Fso373qHRc69LKwAw/Iy6g1WiiM=
 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=

internal/app/configfile/manager.go

@@ -15,6 +15,7 @@ import (
 	"github.com/sirupsen/logrus"
 	evbus "github.com/vardius/message-bus"
 	"github.com/yeqown/go-qrcode/v2"
+	"github.com/yeqown/go-qrcode/writer/compressed"
 )
 
 type Manager struct {
@@ -27,7 +28,13 @@ type Manager struct {
 	wg     WireguardDatabaseRepo
 }
 
-func NewConfigFileManager(cfg *config.Config, bus evbus.MessageBus, users UserDatabaseRepo, wg WireguardDatabaseRepo, fsRepo FileSystemRepo) (*Manager, error) {
+func NewConfigFileManager(
+	cfg *config.Config,
+	bus evbus.MessageBus,
+	users UserDatabaseRepo,
+	wg WireguardDatabaseRepo,
+	fsRepo FileSystemRepo,
+) (*Manager, error) {
 	tplHandler, err := newTemplateHandler()
 	if err != nil {
 		return nil, fmt.Errorf("failed to initialize template handler: %w", err)
@@ -156,18 +163,19 @@ func (m Manager) GetPeerConfigQrCode(ctx context.Context, id domain.PeerIdentifi
 		return nil, fmt.Errorf("failed to read peer config for %s: %w", id, err)
 	}
 
-	code, err := qrcode.New(sb.String())
+	code, err := qrcode.NewWith(sb.String(),
+		qrcode.WithErrorCorrectionLevel(qrcode.ErrorCorrectionLow), qrcode.WithEncodingMode(qrcode.EncModeByte))
 	if err != nil {
-		return nil, fmt.Errorf("failed to initializeqr code for %s: %w", id, err)
+		return nil, fmt.Errorf("failed to initialize qr code for %s: %w", id, err)
 	}
 
 	buf := bytes.NewBuffer(nil)
 	wr := nopCloser{Writer: buf}
-	option := Option{
+	option := compressed.Option{
 		Padding:   8, // padding pixels around the qr code.
 		BlockSize: 4, // block pixels which represents a bit data.
 	}
-	qrWriter := NewCompressedWriter(wr, &option)
+	qrWriter := compressed.NewWithWriter(wr, &option)
 	err = code.Save(qrWriter)
 	if err != nil {
 		return nil, fmt.Errorf("failed to write code for %s: %w", id, err)