feat: auth.

middleware/auth.go

@@ -0,0 +1,84 @@
+package middleware
+
+import (
+	"fmt"
+	"github.com/gin-gonic/gin"
+	"github.com/golang-jwt/jwt/v5"
+	"net/http"
+	"strings"
+	"time"
+)
+
+const (
+	ApiSecret = "your-super-secret-key" // 预共享密钥
+	TokenExp  = 1 * time.Hour           // Token有效期
+)
+
+type JWTService struct {
+	secretKey []byte
+	expiresIn time.Duration
+}
+
+func NewJWTService(secret string, expiresIn time.Duration) *JWTService {
+	return &JWTService{
+		secretKey: []byte(secret),
+		expiresIn: expiresIn,
+	}
+}
+
+// 生成带HMAC签名的Token
+func (s *JWTService) GenerateToken() (string, error) {
+	claims := jwt.MapClaims{
+		"exp": time.Now().Add(s.expiresIn).Unix(),
+		"iat": time.Now().Unix(),
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString(s.secretKey)
+}
+
+// 验证HMAC签名的Token
+func (s *JWTService) ValidateToken(tokenString string) (jwt.Claims, error) {
+	token, err := jwt.Parse(tokenString, func(t *jwt.Token) (interface{}, error) {
+		if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, jwt.ErrSignatureInvalid
+		}
+		return s.secretKey, nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	if claims, ok := token.Claims.(jwt.MapClaims); ok && token.Valid {
+		return claims, nil
+	}
+
+	return nil, jwt.ErrTokenInvalidClaims
+}
+
+// 鉴权中间件
+func AuthMiddleware() gin.HandlerFunc {
+	return func(c *gin.Context) {
+		authHeader := c.GetHeader("Authorization")
+		if authHeader == "" {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "Authorization header required"})
+			return
+		}
+
+		tokenString := strings.TrimPrefix(authHeader, "Bearer ")
+		token, err := jwt.Parse(tokenString, func(t *jwt.Token) (interface{}, error) {
+			if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
+				return nil, fmt.Errorf("unexpected signing method: %v", t.Header["alg"])
+			}
+			return []byte(ApiSecret), nil
+		})
+
+		if err != nil || !token.Valid {
+			c.AbortWithStatusJSON(http.StatusUnauthorized, gin.H{"error": "invalid token"})
+			return
+		}
+
+		c.Next()
+	}
+}