func (auth BaiduAuth) Sign(signParam *SignParameter) (sUrl string, err error) {
var u bytes.Buffer
s, err := auth.sign(signParam)
u.WriteString("http://")
if auth.Host() == "" {
err = errors.New("Host is empty")
return
}
u.WriteString(strings.Trim(auth.Host(), "/"))
u.WriteString("/")
u.WriteString(strings.Trim(signParam.Bucket, "/"))
objStr := strings.TrimLeft(signParam.Object, "/")
if len(objStr) > 0 {
u.WriteString("/")
u.WriteString(url.QueryEscape(utils.UrlPreEncode(objStr)))
}
u.WriteString("?sign=")
u.WriteString(s)
if signParam.Time != "" {
u.WriteString("&time=")
u.WriteString(signParam.Time)
}
if signParam.Ip != "" {
u.WriteString("&ip=")
u.WriteString(signParam.Ip)
}
if signParam.Size != "" {
u.WriteString("&size=")
u.WriteString(signParam.Size)
}
sUrl = u.String()
return
}
func (auth BaiduAuth) sign(signParam *SignParameter) (result string, err error) {
flag, data := content(signParam)
var f func() hash.Hash = sha1.New
h := hmac.New(f, auth.Secret())
h.Write(data)
signed := base64.URLEncoding.EncodeToString(h.Sum(nil))
var buff bytes.Buffer
buff.WriteString(flag)
buff.WriteString(":")
buff.WriteString(auth.Key())
buff.WriteString(":")
buff.WriteString(url.QueryEscape(utils.UrlPreEncode(signed)))
result = buff.String()
return
}