controllers/auth.go

package controllers

import (
	"net/http"
	"os"
	"time"
	"uptime/backend/database"
	"uptime/backend/models"

	"github.com/gin-gonic/gin"
	"github.com/golang-jwt/jwt/v5"
	"golang.org/x/crypto/bcrypt"
)

func Login(c *gin.Context) {
	var body struct {
		Username string `json:"username"`
		Password string `json:"password"`
	}

	if err := c.BindJSON(&body); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Failed to read body"})
		return
	}

	var user models.User
	database.DB.First(&user, "username = ?", body.Username)

	if user.ID == 0 {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid username or password"})
		return
	}

	err := bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(body.Password))
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid username or password"})
		return
	}

	token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
		"sub": user.ID,
		"exp": time.Now().Add(time.Hour * 24 * 30).Unix(),
	})

	tokenString, err := token.SignedString([]byte(os.Getenv("SECRET")))
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Failed to create token"})
		return
	}

	c.SetSameSite(http.SameSiteLaxMode)
	c.SetCookie("Authorization", tokenString, 3600*24*30, "/", "", false, true)

	c.JSON(http.StatusOK, gin.H{})
}