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import (
	"github.com/pquerna/otp"
	"github.com/pquerna/otp/totp"
)

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key, err := totp.Generate(totp.GenerateOpts{
    Issuer:      "system",
    AccountName: "user",
    Digits:      digitalLen,  // default is 6
})

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key.URL()

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img, err := key.Image(256, 256)

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import "github.com/skip2/go-qrcode"

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qr, err := qrcode.New(key.URL(), qrcode.Medium)
if err != nil {
    panic(err)
}

fmt.Println(qr.ToSmallString(true))

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validateOpts := totp.ValidateOpts{
    Period:    30,
    Skew:      1,
    Digits:    digitalLen,
    Algorithm: otp.AlgorithmSHA1,
}

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code, err := totp.GenerateCodeCustom(key.Secret(), time.Now(), validateOpts)
if err != nil {
    panic(err)
}
fmt.Println(code)

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success, err := totp.ValidateCustom(code, key.Secret(), time.Now(), validateOpts)