Inicial

backend/internal/auth/jwt.go

@@ -0,0 +1,54 @@
+package auth
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+type Claims struct {
+	UserID   string `json:"user_id"`
+	TenantID string `json:"tenant_id,omitempty"`
+	Role     string `json:"role"`
+	jwt.RegisteredClaims
+}
+
+func GenerateAccessToken(userID, tenantID, role, secret string) (string, error) {
+	return generateToken(userID, tenantID, role, secret, 15*time.Minute)
+}
+
+func GenerateRefreshToken(userID, tenantID, role, secret string) (string, error) {
+	return generateToken(userID, tenantID, role, secret, 30*24*time.Hour)
+}
+
+func generateToken(userID, tenantID, role, secret string, ttl time.Duration) (string, error) {
+	claims := Claims{
+		UserID:   userID,
+		TenantID: tenantID,
+		Role:     role,
+		RegisteredClaims: jwt.RegisteredClaims{
+			ExpiresAt: jwt.NewNumericDate(time.Now().Add(ttl)),
+			IssuedAt:  jwt.NewNumericDate(time.Now()),
+		},
+	}
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString([]byte(secret))
+}
+
+func ValidateToken(tokenStr, secret string) (*Claims, error) {
+	token, err := jwt.ParseWithClaims(tokenStr, &Claims{}, func(t *jwt.Token) (interface{}, error) {
+		if _, ok := t.Method.(*jwt.SigningMethodHMAC); !ok {
+			return nil, fmt.Errorf("método de assinatura inesperado: %v", t.Header["alg"])
+		}
+		return []byte(secret), nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	claims, ok := token.Claims.(*Claims)
+	if !ok || !token.Valid {
+		return nil, fmt.Errorf("token inválido")
+	}
+	return claims, nil
+}