feat(auth): 添加JWT认证功能

- 引入github.com/golang-jwt/jwt/v5依赖包
- 创建utils/jwt.go文件实现JWT工具函数
- 定义JWTClaims结构体用于存储用户信息
- 实现GenerateToken函数生成JWT令牌
- 实现ParseToken函数解析JWT令牌
- 实现ValidateToken函数验证令牌有效性
- 添加令牌过期和无效的错误处理

go.mod

@@ -7,6 +7,7 @@ require (
 	github.com/fsnotify/fsnotify v1.9.0
 	github.com/gin-gonic/gin v1.7.7
 	github.com/gogf/gf/v2 v2.10.0
+	github.com/golang-jwt/jwt/v5 v5.3.1
 	github.com/gorilla/websocket v1.5.3
 	github.com/spf13/viper v1.21.0
 	gopkg.in/natefinch/lumberjack.v2 v2.2.1

go.sum

@@ -40,6 +40,8 @@ github.com/go-viper/mapstructure/v2 v2.4.0 h1:EBsztssimR/CONLSZZ04E8qAkxNYq4Qp9L
 github.com/go-viper/mapstructure/v2 v2.4.0/go.mod h1:oJDH3BJKyqBA2TXFhDsKDGDTlndYOZ6rGS0BRZIxGhM=
 github.com/gogf/gf/v2 v2.10.0 h1:rzDROlyqGMe/eM6dCalSR8dZOuMIdLhmxKSH1DGhbFs=
 github.com/gogf/gf/v2 v2.10.0/go.mod h1:Svl1N+E8G/QshU2DUbh/3J/AJauqCgUnxHurXWR4Qx0=
+github.com/golang-jwt/jwt/v5 v5.3.1 h1:kYf81DTWFe7t+1VvL7eS+jKFVWaUnK9cB1qbwn63YCY=
+github.com/golang-jwt/jwt/v5 v5.3.1/go.mod h1:fxCRLWMO43lRc8nhHWY6LGqRcf+1gQWArsqaEUEa5bE=
 github.com/golang/protobuf v1.3.3 h1:gyjaxf+svBWX08ZjK86iN9geUJF0H6gp2IRKX6Nf6/I=
 github.com/golang/protobuf v1.3.3/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
 github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=

utils/jwt.go

@@ -0,0 +1,70 @@
+package utils
+
+import (
+	"errors"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+var (
+	ErrTokenInvalid = errors.New("token无效")
+	ErrTokenExpired = errors.New("token已过期")
+)
+
+// JWTClaims JWT声明
+type JWTClaims struct {
+	UserID   int    `json:"user_id"`
+	Username string `json:"username"`
+	jwt.RegisteredClaims
+}
+
+// GenerateToken 生成JWT Token
+func GenerateToken(userID int, username, secret string, expiresInHours int) (string, error) {
+	claims := JWTClaims{
+		UserID:   userID,
+		Username: username,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Duration(expiresInHours) * time.Hour)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+			NotBefore: jwt.NewNumericDate(time.Now()),
+		},
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString([]byte(secret))
+}
+
+// ParseToken 解析JWT Token
+func ParseToken(tokenString, secret string) (*JWTClaims, error) {
+	token, err := jwt.ParseWithClaims(tokenString, &JWTClaims{}, func(token *jwt.Token) (interface{}, error) {
+		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, errors.New("签名方法无效")
+		}
+		return []byte(secret), nil
+	})
+
+	if err != nil {
+		return nil, err
+	}
+
+	if claims, ok := token.Claims.(*JWTClaims); ok && token.Valid {
+		return claims, nil
+	}
+
+	return nil, ErrTokenInvalid
+}
+
+// ValidateToken 验证Token是否有效
+func ValidateToken(tokenString, secret string) error {
+	claims, err := ParseToken(tokenString, secret)
+	if err != nil {
+		return err
+	}
+
+	if claims.ExpiresAt != nil && claims.ExpiresAt.Time.Before(time.Now()) {
+		return ErrTokenExpired
+	}
+
+	return nil
+}