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