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package authenticate
import (
"fmt"
"net/http"
"os"
"strings"
"time"
"github.com/ckrinitsin/shopping-list/models"
"github.com/gin-contrib/sessions"
"github.com/gin-gonic/gin"
"github.com/golang-jwt/jwt/v5"
"golang.org/x/crypto/bcrypt"
"gorm.io/gorm"
)
func CheckAuth(c *gin.Context) {
session := sessions.Default(c)
token_session := session.Get("token")
if token_session == nil {
c.Redirect(http.StatusFound, models.BasePath() + "/login")
return
}
token_string, ok := token_session.(string)
if !ok {
c.Redirect(http.StatusFound, models.BasePath() + "/login")
return
}
token, err := jwt.Parse(token_string, func(token *jwt.Token) (any, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
}
return []byte(os.Getenv("SECRET")), nil
})
if err != nil || !token.Valid {
c.Redirect(http.StatusFound, models.BasePath() + "/login")
c.Error(err)
return
}
claims, ok := token.Claims.(jwt.MapClaims)
if !ok {
c.Redirect(http.StatusFound, models.BasePath() + "/login")
return
}
if float64(time.Now().Unix()) > claims["exp"].(float64) {
c.Redirect(http.StatusFound, models.BasePath() + "/login")
return
}
var list models.List
err = models.DB.
Model(&models.List{}).
Where("name = ?", claims["username"]).
First(&list).
Error
if err != nil {
c.Redirect(http.StatusFound, models.BasePath() + "/login")
return
}
c.Set("current_list", list)
c.Next()
}
func LoginGET(c *gin.Context) {
title := "Shopping List"
c.HTML(http.StatusOK, "login.html", gin.H{
"name": title,
"error": "",
"base_path": models.BasePath(),
})
}
func LoginPOST(c *gin.Context) {
username := strings.TrimSpace(c.PostForm("username"))
password := c.PostForm("password")
var list models.List
err := models.DB.
Model(&models.List{}).
Where("name = ?", username).
First(&list).
Error
if err == gorm.ErrRecordNotFound {
c.HTML(http.StatusBadRequest, "login.html", gin.H{
"error": "User does not exist",
})
return
} else if err != nil {
c.HTML(http.StatusInternalServerError, "login.html", gin.H{
"error": "Internal Server Error",
})
c.Error(err)
return
}
err = bcrypt.CompareHashAndPassword(list.Password, []byte(password))
if err == bcrypt.ErrMismatchedHashAndPassword {
c.HTML(http.StatusBadRequest, "login.html", gin.H{
"error": "Invalid username or password",
})
return
} else if err != nil {
c.HTML(http.StatusInternalServerError, "login.html", gin.H{
"error": "Internal Server Error",
})
c.Error(err)
return
}
session := sessions.Default(c)
token, err := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.MapClaims{
"username": username,
"exp": time.Now().Add(time.Hour * 24 * 30).Unix(),
}).SignedString([]byte(os.Getenv("SECRET")))
if err != nil {
c.HTML(http.StatusInternalServerError, "login.html", gin.H{
"error": "Internal Server Error",
})
c.Error(err)
return
}
session.Set("token", token)
session.Save()
c.Redirect(http.StatusFound, models.BasePath() + "/")
}
func RegisterGET(c *gin.Context) {
title := "Shopping List"
c.HTML(http.StatusOK, "register.html", gin.H{
"name": title,
"error": "",
"base_path": models.BasePath(),
})
}
func RegisterPOST(c *gin.Context) {
username := strings.TrimSpace(c.PostForm("username"))
password := c.PostForm("password")
global_password := strings.TrimSpace(c.PostForm("global_password"))
if username == "" {
c.HTML(http.StatusBadRequest, "register.html", gin.H{
"error": "Invalid username",
})
return
}
if len(password) <= 0 && len(password) <= 72 {
c.HTML(http.StatusBadRequest, "register.html", gin.H{
"error": "Invalid password",
})
return
}
if global_password != os.Getenv("GLOBAL_PASSWORD") {
c.HTML(http.StatusBadRequest, "register.html", gin.H{
"error": "Global Password is wrong",
})
return
}
var count int64
err := models.DB.
Model(&models.List{}).
Where("name = ?", username).
Count(&count).
Error
if count > 0 {
c.HTML(http.StatusBadRequest, "register.html", gin.H{
"error": "User does exist already",
})
return
} else if err != gorm.ErrRecordNotFound && err != nil {
c.HTML(http.StatusInternalServerError, "register.html", gin.H{
"error": "Internal Server Error",
})
c.Error(err)
return
}
hash, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
if err != nil {
c.HTML(http.StatusInternalServerError, "register.html", gin.H{
"error": "Internal Server Error",
})
c.Error(err)
return
}
var list models.List
list = models.List{
Name: username,
Password: hash,
}
err = models.DB.
Create(&list).
Error
if err != nil {
c.HTML(http.StatusInternalServerError, "register.html", gin.H{
"error": "Internal Server Error",
})
c.Error(err)
return
}
c.Redirect(http.StatusFound, models.BasePath() + "/login")
}
func Logout(c *gin.Context) {
session := sessions.Default(c)
session.Delete("token")
session.Save()
c.Redirect(http.StatusFound, models.BasePath() + "/login")
}
|