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google_auth.go
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google_auth.go
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package util
import (
"bytes"
"crypto/hmac"
"crypto/sha1"
"encoding/base32"
"encoding/binary"
"fmt"
"net/url"
"strings"
"time"
)
type GoogleAuth struct {
}
func NewGoogleAuth() *GoogleAuth {
return &GoogleAuth{}
}
func (this *GoogleAuth) un() int64 {
return time.Now().UnixNano() / 1000 / 30
}
func (this *GoogleAuth) hmacSha1(key, data []byte) []byte {
h := hmac.New(sha1.New, key)
if total := len(data); total > 0 {
h.Write(data)
}
return h.Sum(nil)
}
func (this *GoogleAuth) base32encode(src []byte) string {
return base32.StdEncoding.EncodeToString(src)
}
func (this *GoogleAuth) base32decode(s string) ([]byte, error) {
return base32.StdEncoding.DecodeString(s)
}
func (this *GoogleAuth) toBytes(value int64) []byte {
var result []byte
mask := int64(0xFF)
shifts := [8]uint16{56, 48, 40, 32, 24, 16, 8, 0}
for _, shift := range shifts {
result = append(result, byte((value>>shift)&mask))
}
return result
}
func (this *GoogleAuth) toUint32(bts []byte) uint32 {
return (uint32(bts[0]) << 24) + (uint32(bts[1]) << 16) +
(uint32(bts[2]) << 8) + uint32(bts[3])
}
func (this *GoogleAuth) oneTimePassword(key []byte, data []byte) uint32 {
hash := this.hmacSha1(key, data)
offset := hash[len(hash)-1] & 0x0F
hashParts := hash[offset : offset+4]
hashParts[0] = hashParts[0] & 0x7F
number := this.toUint32(hashParts)
return number % 1000000
}
// GetSecret 获取秘钥
func (this *GoogleAuth) GetSecret() string {
var buf bytes.Buffer
binary.Write(&buf, binary.BigEndian, this.un())
return strings.ToUpper(this.base32encode(this.hmacSha1(buf.Bytes(), nil)))
}
// GetCode 获取动态码
func (this *GoogleAuth) GetCode(secret string) (string, error) {
secretUpper := strings.ToUpper(secret)
secretKey, err := this.base32decode(secretUpper)
if err != nil {
return "", err
}
number := this.oneTimePassword(secretKey, this.toBytes(time.Now().Unix()/30))
return fmt.Sprintf("%06d", number), nil
}
// GetQrcode 获取动态码二维码内容
func (this *GoogleAuth) GetQrcode(secret string) string {
return fmt.Sprintf("otpauth://totp/%s?secret=%s", "IM项目管理后台", secret)
}
// GetQrcodeUrl 获取动态码二维码图片地址,这里是第三方二维码api
func (this *GoogleAuth) GetQrcodeUrl(secret string) string {
qrcode := this.GetQrcode(secret)
width := "200"
height := "200"
data := url.Values{}
data.Set("data", qrcode)
return "https://api.qrserver.com/v1/create-qr-code/?" + data.Encode() + "&size=" + width + "x" + height + "&ecc=M"
}
// VerifyCode 验证动态码
func (this *GoogleAuth) VerifyCode(secret, code string) (bool, error) {
_code, err := this.GetCode(secret)
fmt.Println(_code, code, err)
if err != nil {
return false, err
}
return _code == code, nil
}
var err error