func (o *OTP) QRImage(width, height int) (image.Image, error) {
key, err := otp.NewKeyFromURL(o.URI)
if err != nil {
return nil, err
}
return key.Image(width, height)
}
func (o *OTP) Validate(password string) error {
key, err := otp.NewKeyFromURL(o.URI)
if err != nil {
return err
}
if !totp.Validate(password, key.Secret()) {
return ErrAccessDenied
}
return nil
}
// Generate a new TOTP Key.
func Generate(opts GenerateOpts) (*otp.Key, error) {
// url encode the Issuer/AccountName
if opts.Issuer == "" {
return nil, otp.ErrGenerateMissingIssuer
}
if opts.AccountName == "" {
return nil, otp.ErrGenerateMissingAccountName
}
if opts.Period == 0 {
opts.Period = 30
}
if opts.SecretSize == 0 {
opts.SecretSize = 10
}
// otpauth://totp/Example:[email protected]?secret=JBSWY3DPEHPK3PXP&issuer=Example
v := url.Values{}
secret := make([]byte, opts.SecretSize)
_, err := rand.Read(secret)
if err != nil {
return nil, err
}
v.Set("secret", base32.StdEncoding.EncodeToString(secret))
v.Set("issuer", opts.Issuer)
v.Set("period", strconv.FormatUint(uint64(opts.Period), 10))
v.Set("algorithm", opts.Algorithm.String())
v.Set("digits", opts.Digits.String())
u := url.URL{
Scheme: "otpauth",
Host: "totp",
Path: "/" + opts.Issuer + ":" + opts.AccountName,
RawQuery: v.Encode(),
}
return otp.NewKeyFromURL(u.String())
}