Initial commit

server/pkg/jwt/jwt.go

@@ -0,0 +1,82 @@
+package jwt
+
+import (
+	"dianshang/internal/config"
+	"errors"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+// Claims JWT声明结构
+type Claims struct {
+	UserID   uint   `json:"user_id"`
+	UserType string `json:"user_type"` // user, admin
+	jwt.RegisteredClaims
+}
+
+var jwtSecret []byte
+
+// Init 初始化JWT
+func Init(cfg config.JWTConfig) {
+	jwtSecret = []byte(cfg.Secret)
+}
+
+// GenerateToken 生成JWT token
+func GenerateToken(userID uint, userType string, expire int) (string, error) {
+	nowTime := time.Now()
+	expireTime := nowTime.Add(time.Duration(expire) * time.Second)
+
+	claims := Claims{
+		UserID:   userID,
+		UserType: userType,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(expireTime),
+			IssuedAt:  jwt.NewNumericDate(nowTime),
+			NotBefore: jwt.NewNumericDate(nowTime),
+			Issuer:    "dianshang",
+		},
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString(jwtSecret)
+}
+
+// ParseToken 解析JWT token
+func ParseToken(tokenString string) (*Claims, error) {
+	token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (interface{}, error) {
+		return jwtSecret, nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	if claims, ok := token.Claims.(*Claims); ok && token.Valid {
+		return claims, nil
+	}
+
+	return nil, errors.New("invalid token")
+}
+
+// RefreshToken 刷新token
+func RefreshToken(tokenString string, expire int) (string, error) {
+	claims, err := ParseToken(tokenString)
+	if err != nil {
+		return "", err
+	}
+
+	// 检查token是否即将过期（剩余时间少于30分钟）
+	if time.Until(claims.ExpiresAt.Time) > 30*time.Minute {
+		return tokenString, nil
+	}
+
+	// 生成新token
+	return GenerateToken(claims.UserID, claims.UserType, expire)
+}
+
+// ValidateToken 验证token有效性
+func ValidateToken(tokenString string) bool {
+	_, err := ParseToken(tokenString)
+	return err == nil
+}