55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
package auth
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import (
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"crypto/hmac"
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"crypto/sha256"
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"encoding/base64"
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"io"
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"strconv"
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"strings"
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"time"
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)
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// HMACAuth HMAC算法鉴权
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type HMACAuth struct {
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SecretKey []byte
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}
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// Sign 对给定Body生成expires后失效的签名，expires为过期时间戳，
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// 填写为0表示不限制有效期
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func (auth HMACAuth) Sign(body string, expires int64) string {
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h := hmac.New(sha256.New, auth.SecretKey)
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expireTimeStamp := strconv.FormatInt(expires, 10)
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_, err := io.WriteString(h, body+":"+expireTimeStamp)
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if err != nil {
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return ""
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}
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return base64.URLEncoding.EncodeToString(h.Sum(nil)) + ":" + expireTimeStamp
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}
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// Check 对给定Body和Sign进行鉴权，包括对expires的检查
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func (auth HMACAuth) Check(body string, sign string) error {
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signSlice := strings.Split(sign, ":")
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// 如果未携带expires字段
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if signSlice[len(signSlice)-1] == "" {
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return ErrExpiresMissing
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}
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// 验证是否过期
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expires, err := strconv.ParseInt(signSlice[len(signSlice)-1], 10, 64)
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if err != nil {
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return ErrAuthFailed.WithError(err)
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}
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// 如果签名过期
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if expires < time.Now().Unix() && expires != 0 {
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return ErrExpired
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}
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// 验证签名
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if auth.Sign(body, expires) != sign {
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return ErrAuthFailed
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}
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return nil
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}
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