112 lines
2.8 KiB
Go
112 lines
2.8 KiB
Go
package auth
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import (
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"crypto/sha256"
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"encoding/hex"
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"errors"
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"time"
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"github.com/golang-jwt/jwt/v5"
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"github.com/google/uuid"
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)
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// 自定义错误。
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var (
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ErrInvalidToken = errors.New("invalid or expired token")
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)
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// Claims JWT 声明。
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type Claims struct {
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UserID string `json:"user_id"`
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Username string `json:"username"`
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jwt.RegisteredClaims
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}
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// TokenManager JWT 令牌管理器。
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type TokenManager struct {
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secret []byte
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accessTTL time.Duration
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refreshTTL time.Duration
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}
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// NewTokenManager 创建 TokenManager。
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// secret: JWT 签名密钥；accessTTL/refreshTTL: 令牌有效期。
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func NewTokenManager(secret string, accessTTL, refreshTTL time.Duration) *TokenManager {
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return &TokenManager{
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secret: []byte(secret),
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accessTTL: accessTTL,
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refreshTTL: refreshTTL,
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}
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}
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// GeneratePair 生成 access + refresh 令牌对。
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func (tm *TokenManager) GeneratePair(userID, username string) (access, refresh string, err error) {
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now := time.Now()
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// access token
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accessClaims := &Claims{
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UserID: userID,
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Username: username,
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RegisteredClaims: jwt.RegisteredClaims{
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ExpiresAt: jwt.NewNumericDate(now.Add(tm.accessTTL)),
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IssuedAt: jwt.NewNumericDate(now),
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Issuer: "camtalk",
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},
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}
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accessTkn := jwt.NewWithClaims(jwt.SigningMethodHS256, accessClaims)
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access, err = accessTkn.SignedString(tm.secret)
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if err != nil {
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return "", "", err
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}
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// refresh token（含唯一 token_id 用于 DB 关联）
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tokenID := uuid.New().String()
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refreshClaims := &Claims{
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UserID: userID,
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Username: username,
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RegisteredClaims: jwt.RegisteredClaims{
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ID: tokenID,
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ExpiresAt: jwt.NewNumericDate(now.Add(tm.refreshTTL)),
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IssuedAt: jwt.NewNumericDate(now),
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Issuer: "camtalk",
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},
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}
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refreshTkn := jwt.NewWithClaims(jwt.SigningMethodHS256, refreshClaims)
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refresh, err = refreshTkn.SignedString(tm.secret)
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return
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}
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// ValidateAccess 校验 access token 并返回 Claims。
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func (tm *TokenManager) ValidateAccess(tokenStr string) (*Claims, error) {
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return tm.validate(tokenStr)
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}
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// ValidateRefresh 校验 refresh token 并返回 Claims。
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func (tm *TokenManager) ValidateRefresh(tokenStr string) (*Claims, error) {
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return tm.validate(tokenStr)
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}
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// validate 解析并校验 JWT。
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func (tm *TokenManager) validate(tokenStr string) (*Claims, error) {
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token, err := jwt.ParseWithClaims(tokenStr, &Claims{}, func(t *jwt.Token) (interface{}, error) {
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if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, ErrInvalidToken
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}
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return tm.secret, nil
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})
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if err != nil {
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return nil, ErrInvalidToken
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}
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claims, ok := token.Claims.(*Claims)
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if !ok || !token.Valid {
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return nil, ErrInvalidToken
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}
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return claims, nil
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}
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// HashToken 对 token 做 SHA256 哈希，用于 DB 存储。
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func HashToken(token string) string {
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h := sha256.Sum256([]byte(token))
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return hex.EncodeToString(h[:])
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}
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