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sign_url.go
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/
sign_url.go
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package auth
import (
"crypto/md5"
"fmt"
"net/url"
"time"
)
// An URLSigner provides URL signing utilities to sign URLs for Aliyun CDN
// resources.
// authentication document: https://help.aliyun.com/document_detail/85117.html
type URLSigner struct {
authType string
privKey string
}
// NewURLSigner returns a new signer object.
func NewURLSigner(authType string, privKey string) *URLSigner {
return &URLSigner{
authType: authType,
privKey: privKey,
}
}
// Sign returns a signed aliyuncdn url based on authentication type
func (s URLSigner) Sign(uri string, expires time.Time) (string, error) {
r, err := url.Parse(uri)
if err != nil {
return "", fmt.Errorf("unable to parse url: %s", uri)
}
switch s.authType {
case "a":
return aTypeSign(r, s.privKey, expires), nil
case "b":
return bTypeSign(r, s.privKey, expires), nil
case "c":
return cTypeSign(r, s.privKey, expires), nil
default:
return "", fmt.Errorf("invalid authentication type")
}
}
// sign by A type authentication method.
// authentication document: https://help.aliyun.com/document_detail/85113.html
func aTypeSign(r *url.URL, privateKey string, expires time.Time) string {
//rand is a random uuid without "-"
rand := GenerateUUID().String()
// not use, "0" by default
uid := "0"
secret := fmt.Sprintf("%s-%d-%s-%s-%s", r.Path, expires.Unix(), rand, uid, privateKey)
hashValue := md5.Sum([]byte(secret))
authKey := fmt.Sprintf("%d-%s-%s-%x", expires.Unix(), rand, uid, hashValue)
if r.RawQuery == "" {
return fmt.Sprintf("%s?auth_key=%s", r.String(), authKey)
}
return fmt.Sprintf("%s&auth_key=%s", r.String(), authKey)
}
// sign by B type authentication method.
// authentication document: https://help.aliyun.com/document_detail/85114.html
func bTypeSign(r *url.URL, privateKey string, expires time.Time) string {
formatExp := expires.Format("200601021504")
secret := privateKey + formatExp + r.Path
hashValue := md5.Sum([]byte(secret))
signURL := fmt.Sprintf("%s://%s/%s/%x%s?%s", r.Scheme, r.Host, formatExp, hashValue, r.Path, r.RawQuery)
return signURL
}
// sign by C type authentication method.
// authentication document: https://help.aliyun.com/document_detail/85115.html
func cTypeSign(r *url.URL, privateKey string, expires time.Time) string {
hexExp := fmt.Sprintf("%x", expires.Unix())
secret := privateKey + r.Path + hexExp
hashValue := md5.Sum([]byte(secret))
signURL := fmt.Sprintf("%s://%s/%x/%s%s?%s", r.Scheme, r.Host, hashValue, hexExp, r.Path, r.RawQuery)
return signURL
}