first

backend/internal/auth/jwt.go

@@ -0,0 +1,85 @@
+package auth
+
+import (
+	"errors"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+	"golang.org/x/crypto/bcrypt"
+)
+
+var (
+	ErrInvalidToken = errors.New("invalid token")
+	ErrExpiredToken = errors.New("token has expired")
+)
+
+type Claims struct {
+	UserID   uint   `json:"userId"`
+	Username string `json:"username"`
+	Role     string `json:"role"`
+	jwt.RegisteredClaims
+}
+
+type JWTManager struct {
+	secretKey []byte
+	issuer    string
+}
+
+func NewJWTManager(secretKey, issuer string) *JWTManager {
+	return &JWTManager{
+		secretKey: []byte(secretKey),
+		issuer:    issuer,
+	}
+}
+
+func (j *JWTManager) GenerateToken(userID uint, username, role string, duration time.Duration) (string, error) {
+	claims := &Claims{
+		UserID:   userID,
+		Username: username,
+		Role:     role,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(duration)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+			Issuer:    j.issuer,
+		},
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString(j.secretKey)
+}
+
+func (j *JWTManager) ValidateToken(tokenString string) (*Claims, error) {
+	token, err := jwt.ParseWithClaims(tokenString, &Claims{}, func(token *jwt.Token) (interface{}, error) {
+		if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, ErrInvalidToken
+		}
+		return j.secretKey, nil
+	})
+
+	if err != nil {
+		if errors.Is(err, jwt.ErrTokenExpired) {
+			return nil, ErrExpiredToken
+		}
+		return nil, ErrInvalidToken
+	}
+
+	claims, ok := token.Claims.(*Claims)
+	if !ok || !token.Valid {
+		return nil, ErrInvalidToken
+	}
+
+	return claims, nil
+}
+
+func HashPassword(password string) (string, error) {
+	hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		return "", err
+	}
+	return string(hash), nil
+}
+
+func CheckPassword(password, hash string) bool {
+	err := bcrypt.CompareHashAndPassword([]byte(hash), []byte(password))
+	return err == nil
+}

backend/internal/auth/rbac.go

@@ -0,0 +1,18 @@
+package auth
+
+type Role string
+
+const (
+	RoleAdmin Role = "admin"
+	RoleUser  Role = "user"
+)
+
+type Context struct {
+	UserID   uint
+	Username string
+	Role     Role
+}
+
+func (c *Context) IsAdmin() bool {
+	return c.Role == RoleAdmin
+}