85 lines
1.9 KiB
Go
85 lines
1.9 KiB
Go
package middleware
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import (
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"fmt"
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"github.com/gin-gonic/gin"
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"github.com/golang-jwt/jwt/v5"
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"net/http"
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"strings"
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"time"
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)
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const (
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ApiSecret = "your-super-secret-key" // 预共享密钥
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TokenExp = 1 * time.Hour // Token有效期
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)
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type JWTService struct {
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secretKey []byte
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expiresIn time.Duration
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}
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func NewJWTService(secret string, expiresIn time.Duration) *JWTService {
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return &JWTService{
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secretKey: []byte(secret),
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expiresIn: expiresIn,
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}
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}
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// 生成带HMAC签名的Token
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func (s *JWTService) GenerateToken() (string, error) {
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claims := jwt.MapClaims{
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"exp": time.Now().Add(s.expiresIn).Unix(),
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"iat": time.Now().Unix(),
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
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return token.SignedString(s.secretKey)
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}
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// 验证HMAC签名的Token
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func (s *JWTService) ValidateToken(tokenString string) (jwt.Claims, error) {
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token, err := jwt.Parse(tokenString, func(t *jwt.Token) (interface{}, error) {
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if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, jwt.ErrSignatureInvalid
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}
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return s.secretKey, nil
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})
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if err != nil {
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return nil, err
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}
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if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
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return claims, nil
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}
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return nil, jwt.ErrTokenInvalidClaims
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}
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// 鉴权中间件
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func AuthMiddleware() gin.HandlerFunc {
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return func(c *gin.Context) {
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authHeader := c.GetHeader("Authorization")
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if authHeader == "" {
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c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Authorization header required"})
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return
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}
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tokenString := strings.TrimPrefix(authHeader, "Bearer ")
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token, err := jwt.Parse(tokenString, func(t *jwt.Token) (interface{}, error) {
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if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
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return nil, fmt.Errorf("unexpected signing method: %v", t.Header["alg"])
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}
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return []byte(ApiSecret), nil
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})
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if err != nil || !token.Valid {
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c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "invalid token"})
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return
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}
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c.Next()
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}
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}
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