PIbd-42_Kashin_M.I_FinalQualifyingWork/go-auth/controllers/authController.go

package controllers

import (
	"log"
	"main/database"
	"main/models"
	"os"
	"sync"
	"time"

	"github.com/gofiber/fiber/v2"
	"github.com/golang-jwt/jwt/v4"
	"golang.org/x/crypto/bcrypt"

	"github.com/joho/godotenv"
)

var (
	SecretKey       string
	blockedTokens   = make(map[string]struct{})
	blockedTokensMu sync.Mutex
)

func init() {
	if err := godotenv.Load(); err != nil {
		log.Fatal("Ошибка загрузки .env файла")
	}
	SecretKey = os.Getenv("JWT_SECRET_KEY")
	if SecretKey == "" {
		log.Fatal("JWT_SECRET_KEY не задан в .env")
	}
}

func Register(c *fiber.Ctx) error {
	var data map[string]string
	if err := c.BodyParser(&data); err != nil {
		log.Println("Ошибка парсинга тела запроса:", err)
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"message": "Invalid request body"})
	}

	if data["password"] == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"message": "Password is required"})
	}

	var existingUser models.User
	if err := database.DB.Where("email = ?", data["email"]).First(&existingUser).Error; err == nil {
		return c.Status(fiber.StatusConflict).JSON(fiber.Map{"message": "Email already taken"})
	}

	passwordHash, err := bcrypt.GenerateFromPassword([]byte(data["password"]), bcrypt.DefaultCost)
	if err != nil {
		log.Println("Ошибка хеширования пароля:", err)
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"message": "Could not process password"})
	}

	user := models.User{
		Name:     data["name"],
		Email:    data["email"],
		Password: passwordHash,
	}
	database.DB.Create(&user)

	log.Println("Пользователь зарегистрирован:", user.Email)
	return c.JSON(user)
}

func generateToken(user models.User) (string, error) {
	claims := jwt.MapClaims{
		"user_id": user.Id,
		"exp":     time.Now().Add(time.Hour * 24).Unix(),
	}
	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
	return token.SignedString([]byte(SecretKey))
}

func isTokenBlocked(token string) bool {
	blockedTokensMu.Lock()
	defer blockedTokensMu.Unlock()
	_, exists := blockedTokens[token]
	return exists
}

func blockToken(token string) {
	blockedTokensMu.Lock()
	defer blockedTokensMu.Unlock()
	blockedTokens[token] = struct{}{}
}

func Login(c *fiber.Ctx) error {
	var data map[string]string
	if err := c.BodyParser(&data); err != nil {
		log.Println("Ошибка парсинга тела запроса:", err)
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"message": "Invalid request body"})
	}

	var user models.User
	database.DB.Where("email = ?", data["email"]).First(&user)
	if user.Id == 0 {
		return c.Status(fiber.StatusUnauthorized).JSON(fiber.Map{"message": "Invalid email or password"})
	}

	if err := bcrypt.CompareHashAndPassword(user.Password, []byte(data["password"])); err != nil {
		return c.Status(fiber.StatusUnauthorized).JSON(fiber.Map{"message": "Invalid email or password"})
	}

	token, err := generateToken(user)
	if err != nil {
		log.Println("Ошибка генерации JWT токена:", err)
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"message": "Could not generate token"})
	}

	c.Cookie(&fiber.Cookie{
		Name:     "jwt",
		Value:    token,
		Expires:  time.Now().Add(time.Hour * 24),
		HTTPOnly: true,
		Secure:   true,
		SameSite: "Strict",
	})

	log.Println("Пользователь вошел в систему:", user.Email)
	return c.JSON(fiber.Map{"message": "Login successful"})
}

func User(c *fiber.Ctx) error {
	cookie := c.Cookies("jwt")
	if isTokenBlocked(cookie) {
		return c.Status(fiber.StatusUnauthorized).JSON(fiber.Map{"message": "Token is blocked"})
	}

	token, err := jwt.ParseWithClaims(cookie, &jwt.MapClaims{}, func(token *jwt.Token) (interface{}, error) {
		return []byte(SecretKey), nil
	})

	if err != nil {
		return c.Status(fiber.StatusUnauthorized).JSON(fiber.Map{"message": "Unauthorized"})
	}

	claims, ok := token.Claims.(*jwt.MapClaims)
	if !ok || !token.Valid {
		return c.Status(fiber.StatusUnauthorized).JSON(fiber.Map{"message": "Invalid token"})
	}

	var user models.User
	database.DB.Where("id = ?", (*claims)["user_id"]).First(&user)
	if user.Id == 0 {
		return c.Status(fiber.StatusUnauthorized).JSON(fiber.Map{"message": "User not found"})
	}

	return c.JSON(user)
}

func Logout(c *fiber.Ctx) error {
	cookie := c.Cookies("jwt")
	blockToken(cookie)

	c.Cookie(&fiber.Cookie{
		Name:     "jwt",
		Value:    "",
		Expires:  time.Now().Add(-time.Hour),
		HTTPOnly: true,
		Secure:   true,
		SameSite: "Strict",
	})

	log.Println("Пользователь вышел из системы")
	return c.JSON(fiber.Map{"message": "Logout successful"})
}