show mobile url qrcode on desktop page

pkg/api/qrcodes.go

@@ -0,0 +1,51 @@
+package api
+
+import (
+	"bytes"
+	"image/png"
+
+	"github.com/boombuler/barcode"
+	"github.com/boombuler/barcode/qr"
+
+	"github.com/mayswind/ezbookkeeping/pkg/core"
+	"github.com/mayswind/ezbookkeeping/pkg/errs"
+	"github.com/mayswind/ezbookkeeping/pkg/settings"
+)
+
+const (
+	qrCodeDefaultWidth  int = 320
+	qrCodeDefaultHeight int = 320
+)
+
+// QrCodesApi represents qrcode generator api
+type QrCodesApi struct {
+}
+
+// Initialize a qrcode generator api singleton instance
+var (
+	QrCodes = &QrCodesApi{}
+)
+
+// MobileUrlQrCodeHandler returns a mobile url qr code image
+func (a *QrCodesApi) MobileUrlQrCodeHandler(c *core.Context) ([]byte, string, *errs.Error) {
+	fullUrl := settings.Container.Current.RootUrl + "mobile"
+	data, err := a.generateUrlQrCode(c, fullUrl)
+
+	if err != nil {
+		return nil, "", errs.ErrOperationFailed
+	}
+
+	return data, "", nil
+}
+
+func (a *QrCodesApi) generateUrlQrCode(c *core.Context, url string) ([]byte, *errs.Error) {
+	qrCodeImg, _ := qr.Encode(url, qr.M, qr.Auto)
+	qrCodeImg, _ = barcode.Scale(qrCodeImg, qrCodeDefaultWidth, qrCodeDefaultHeight)
+	imgData := &bytes.Buffer{}
+
+	if err := png.Encode(imgData, qrCodeImg); err != nil {
+		return nil, errs.ErrOperationFailed
+	}
+
+	return imgData.Bytes(), nil
+}