wechaty/go-wechaty

package filebox

import (
    "bytes"
    "fmt"
    "github.com/skip2/go-qrcode"
    "io"
)

var _ fileImplInterface = &fileBoxQRCode{}

type fileBoxQRCode struct {
    qrCode string
}

func newFileBoxQRCode(qrCode string) *fileBoxQRCode {
    return &fileBoxQRCode{qrCode: qrCode}
}

func (fb *fileBoxQRCode) toJSONMap() (map[string]interface{}, error) {
    if fb.qrCode == "" {
        return nil, fmt.Errorf("fileBoxQRCode.toJSONMap %w", ErrNoQRCode)
    }

    return map[string]interface{}{
        "qrCode": fb.qrCode,
    }, nil
}

func (fb *fileBoxQRCode) toBytes() ([]byte, error) {
    qr, err := qrcode.New(fb.qrCode, qrcode.Medium)
    if err != nil {
        return nil, err
    }
    return qr.PNG(256)
}

func (fb *fileBoxQRCode) toReader() (io.Reader, error) {
    byteData, err := fb.toBytes()
    if err != nil {
        return nil, err
    }
    return bytes.NewReader(byteData), nil
}