init: 初始化项目

internal/auth/jwt.go

@@ -0,0 +1,131 @@
+package auth
+
+import (
+	"errors"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+// Claims JWT 声明
+type Claims struct {
+	UserID   string `json:"userId"`
+	Username string `json:"username"`
+	Role     string `json:"role"`
+	jwt.RegisteredClaims
+}
+
+// TokenPair 访问令牌和刷新令牌
+type TokenPair struct {
+	AccessToken  string `json:"accessToken"`
+	RefreshToken string `json:"refreshToken"`
+	ExpiresIn    int64  `json:"expiresIn"` // 秒
+}
+
+// JWTService JWT 服务
+type JWTService struct {
+	secret               string
+	accessTokenDuration  time.Duration
+	refreshTokenDuration time.Duration
+}
+
+// NewJWTService 创建 JWT 服务
+func NewJWTService(secret string, accessTokenDuration, refreshTokenDuration time.Duration) *JWTService {
+	return &JWTService{
+		secret:               secret,
+		accessTokenDuration:  accessTokenDuration,
+		refreshTokenDuration: refreshTokenDuration,
+	}
+}
+
+// GenerateTokenPair 生成访问令牌和刷新令牌
+func (s *JWTService) GenerateTokenPair(userID, username, role string) (*TokenPair, error) {
+	// 生成访问令牌
+	accessToken, err := s.generateToken(userID, username, role, s.accessTokenDuration)
+	if err != nil {
+		return nil, err
+	}
+
+	// 生成刷新令牌（更长的过期时间，不包含敏感信息）
+	refreshToken, err := s.generateToken(userID, "", "", s.refreshTokenDuration)
+	if err != nil {
+		return nil, err
+	}
+
+	return &TokenPair{
+		AccessToken:  accessToken,
+		RefreshToken: refreshToken,
+		ExpiresIn:    int64(s.accessTokenDuration.Seconds()),
+	}, nil
+}
+
+// generateToken 生成 token
+func (s *JWTService) generateToken(userID, username, role string, duration time.Duration) (string, error) {
+	now := time.Now()
+	claims := Claims{
+		UserID:   userID,
+		Username: username,
+		Role:     role,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(now.Add(duration)),
+			IssuedAt:  jwt.NewNumericDate(now),
+			NotBefore: jwt.NewNumericDate(now),
+		},
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString([]byte(s.secret))
+}
+
+// ParseToken 解析 token
+func (s *JWTService) ParseToken(tokenString string) (*Claims, error) {
+	token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (interface{}, error) {
+		// 验证签名算法
+		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, errors.New("unexpected signing method")
+		}
+		return []byte(s.secret), 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")
+}
+
+// ValidateToken 验证 token 是否有效
+func (s *JWTService) ValidateToken(tokenString string) (*Claims, error) {
+	claims, err := s.ParseToken(tokenString)
+	if err != nil {
+		return nil, err
+	}
+
+	// 检查是否过期
+	if time.Now().Unix() > claims.ExpiresAt.Unix() {
+		return nil, errors.New("token expired")
+	}
+
+	return claims, nil
+}
+
+// RefreshAccessToken 使用刷新令牌生成新的访问令牌
+func (s *JWTService) RefreshAccessToken(refreshToken string, user *User) (*TokenPair, error) {
+	// 验证刷新令牌
+	claims, err := s.ValidateToken(refreshToken)
+	if err != nil {
+		return nil, errors.New("invalid refresh token")
+	}
+
+	// 确保刷新令牌属于该用户
+	if claims.UserID != user.ID {
+		return nil, errors.New("token does not match user")
+	}
+
+	// 生成新的 token 对
+	return s.GenerateTokenPair(user.ID, user.Username, user.Role)
+}