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urlsign.go
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/
urlsign.go
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package auth
import (
"crypto/hmac"
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"encoding/base64"
"fmt"
"hash"
"math/rand"
URL "net/url"
"strconv"
"strings"
"time"
"github.com/madlabx/pkgx/log"
)
func ValidateSign(url string, format []string, enc, secret string) error {
purl, err := URL.Parse(url)
if err != nil {
return fmt.Errorf("Invalid url: %s, error: %v", url, err)
}
idx := strings.Index(url, "?")
if idx >= 0 {
url = url[:idx]
}
// fill the sign fields
fields := map[string]string{
"url": url,
"algo": "hmac-sha256",
}
fillSignFieldsFromUrl(purl, fields)
if es, ok := fields["expires"]; ok {
expires, err := strconv.ParseInt(es, 10, 64)
if err != nil {
log.Debugf("Invalid expires value: %d, error: %v", es, err)
return fmt.Errorf("Invalid url expires param: %s, error: %v", es, err)
}
now := time.Now().UTC().Unix()
if expires <= now {
log.Debugf("The url %s expires, expires value: %d, now: %d", url, expires, now)
return fmt.Errorf("Url expires")
}
}
usign, _ := fields["sign"]
if usign == "" {
return fmt.Errorf("No sign found in url")
}
sign, err := genSign(fields, format, fields["algo"], enc, secret)
if err != nil {
return err
}
if usign != sign {
log.Debugf("The url sign %s mismatches with gen sign: %s", usign, sign)
return fmt.Errorf("The url sign is invalid")
}
return nil
}
func UrlSign(url string, fields map[string]string, format []string,
algo, enc, secret string, expire int) (string, error) {
purl, err := URL.Parse(url)
if err != nil {
return "", fmt.Errorf("Invalid url: %s, error: %v", url, err)
}
idx := strings.Index(url, "?")
ourl := url
if idx >= 0 {
url = url[:idx]
}
// fill the sign fields
now := time.Now().UTC().Unix()
fields["url"] = url
fields["algo"] = algo
fields["expires"] = fmt.Sprintf("%d", now+int64(expire))
fm := map[string]string{}
fillSignFieldsFromUrl(purl, fm)
for k, v := range fields {
fm[k] = v
}
fields = fm
sign, err := genSign(fields, format, algo, enc, secret)
if err != nil {
return "", err
}
querys := []string{}
for _, field := range format {
if field == "url" || field == "uri" || field == "path" {
continue
}
if _, ok := purl.Query()[field]; ok {
// skip the field already in the url
continue
}
value := fields[field]
querys = append(querys, field+"="+value)
}
querys = append(querys, "sign="+sign)
queryStr := strings.Join(querys, "&")
if idx >= 0 {
return ourl + "&" + queryStr, nil
}
return ourl + "?" + queryStr, nil
}
func fillSignFieldsFromUrl(purl *URL.URL, fields map[string]string) {
fields["uri"] = purl.Path
fields["path"] = purl.Path
fields["host"] = purl.Hostname()
fields["port"] = purl.Port()
fields["scheme"] = purl.Scheme
fields["query"] = purl.RawQuery
for k, vl := range purl.Query() {
if len(vl) == 0 {
continue
}
fields[k] = vl[0]
}
}
func genSign(fields map[string]string, format []string, algo, enc, secret string) (string, error) {
signs := []string{}
for _, field := range format {
v, ok := fields[field]
if !ok {
log.Debugf("No such field '%s' value provided for urlsign, use the empty string instead", field)
}
signs = append(signs, v)
}
ss := strings.Join(signs, "/")
signStr := ss + " " + secret
var h hash.Hash
switch algo {
case "md5":
h = md5.New()
case "hmac-md5":
signStr = ss
h = hmac.New(md5.New, []byte(secret))
case "sha1":
h = sha1.New()
case "hmac-sha1":
signStr = ss
h = hmac.New(sha1.New, []byte(secret))
case "sha256":
h = sha256.New()
case "hmac-sha256":
signStr = ss
h = hmac.New(sha256.New, []byte(secret))
case "sha512":
h = sha512.New()
case "hmac-sha512":
signStr = ss
h = hmac.New(sha512.New, []byte(secret))
default:
log.Errorf("Unsupported urlsign algo: %s", algo)
return "", fmt.Errorf("Unsupported urlsign algo: %s", algo)
}
h.Write([]byte(signStr))
bytes := h.Sum(nil)
sign := EncSign(bytes, enc)
log.Debugf("sign string(%s/%s): %s, sign: %s, signs: %#v, format: %#v",
algo, enc, ss, sign, signs, format)
return sign, nil
}
func EncSign(bytes []byte, enc string) string {
switch enc {
case "base64":
bs := base64.StdEncoding.EncodeToString(bytes)
bs = strings.Replace(bs, "+", "-", -1)
bs = strings.Replace(bs, "/", "_", -1)
bs = strings.Replace(bs, "=", "", -1)
return bs
default:
// use the hex as default
return fmt.Sprintf("%x", bytes)
}
}
var letters = []byte("abcdefghijklmnopqrstuvwxyz0123456789")
func RandString(n int) string {
b := make([]byte, n)
for i := range b {
b[i] = letters[rand.Intn(len(letters))]
}
return string(b)
}
func genTxid(now int64, deviceId string) string {
return fmt.Sprintf("%s-%d-%s", deviceId, now, RandString(10))
}
func ParseSignFormat(fstr string) []string {
format := strings.Split(fstr, "$")
es := ""
as := ""
nfmt := []string{}
for _, fmt := range format {
if fmt == "expires" {
es = fmt
} else if fmt == "algo" {
as = fmt
}
if fmt != "" {
nfmt = append(nfmt, fmt)
}
}
format = nfmt
if as == "" {
format = append(format, "algo")
}
if es == "" {
format = append(format, "expires")
}
return format
}