/
jwt.go
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/
jwt.go
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package auth
import (
"fmt"
"github.com/gin-gonic/gin"
"github.com/golang-jwt/jwt"
"net/http"
"os"
)
type JwtPayload struct {
Username string `json:"username"`
Admin bool `json:"admin"`
UserId uint `json:"userId"`
Theme string `json:"theme"`
}
type JwtRefreshPayload struct {
JwtToken string `json:"jwtToken"`
}
func ExtractAuth(ctx *gin.Context) (jwtPayload *JwtPayload, err error) {
jwtCookie, err := ctx.Request.Cookie("token")
if err != nil || jwtCookie == nil {
return refreshTokens(ctx)
}
return VerifyJwtToken(jwtCookie.Value)
}
func DeleteAuthCookies(ctx *gin.Context) {
jwtCookie := http.Cookie{
Name: "token",
Value: "",
Path: "/",
Domain: "",
MaxAge: -1,
SameSite: http.SameSiteStrictMode,
Secure: true,
HttpOnly: true,
}
http.SetCookie(ctx.Writer, &jwtCookie)
refreshCookie := http.Cookie{
Name: "refreshToken",
Value: "",
Path: "/",
Domain: "",
MaxAge: -1,
SameSite: http.SameSiteStrictMode,
Secure: true,
HttpOnly: true,
}
http.SetCookie(ctx.Writer, &refreshCookie)
}
func AddAuthCookies(ctx *gin.Context, jwtToken string, refreshToken string) {
jwtCookie := http.Cookie{
Name: "token",
Value: jwtToken,
Path: "/",
Domain: "",
MaxAge: 60,
SameSite: http.SameSiteStrictMode,
Secure: true,
HttpOnly: true,
}
http.SetCookie(ctx.Writer, &jwtCookie)
refreshCookie := http.Cookie{
Name: "refreshToken",
Value: refreshToken,
Path: "/",
Domain: "",
MaxAge: 60 * 60 * 3,
SameSite: http.SameSiteStrictMode,
Secure: true,
HttpOnly: true,
}
http.SetCookie(ctx.Writer, &refreshCookie)
}
func VerifyRefreshToken(token string) (payload *JwtRefreshPayload, err error) {
jwtSecret := []byte(os.Getenv("JWT_SECRET"))
return verifyRefreshToken(token, jwtSecret)
}
func VerifyJwtToken(token string) (payload *JwtPayload, err error) {
jwtSecret := []byte(os.Getenv("JWT_SECRET"))
return verifyJwtToken(token, jwtSecret)
}
func verifyJwtToken(token string, jwtSecret []byte) (payload *JwtPayload, err error) {
jwtToken, err := jwt.Parse(token, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
}
return jwtSecret, nil
})
if err != nil {
fmt.Println("Token parsing error:", err)
return nil, err
}
if _, ok := jwtToken.Claims.(jwt.MapClaims); ok && jwtToken.Valid {
payload = &JwtPayload{
Username: jwtToken.Claims.(jwt.MapClaims)["username"].(string),
Admin: jwtToken.Claims.(jwt.MapClaims)["admin"].(bool),
UserId: uint(jwtToken.Claims.(jwt.MapClaims)["userId"].(float64)),
Theme: jwtToken.Claims.(jwt.MapClaims)["theme"].(string),
}
return payload, nil
}
return nil, fmt.Errorf("invalid token")
}
func verifyRefreshToken(token string, jwtSecret []byte) (payload *JwtRefreshPayload, err error) {
jwtToken, err := jwt.Parse(token, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("unexpected signing method: %v", token.Header["alg"])
}
return jwtSecret, nil
})
if err != nil {
fmt.Println("Token parsing error:", err)
return nil, err
}
if _, ok := jwtToken.Claims.(jwt.MapClaims); ok && jwtToken.Valid {
payload = &JwtRefreshPayload{
JwtToken: jwtToken.Claims.(jwt.MapClaims)["jwtToken"].(string),
}
return payload, nil
}
return nil, fmt.Errorf("invalid token")
}
func GenerateTokens(payload *JwtPayload) (token string, refreshToken string, err error) {
jwtSecret := []byte(os.Getenv("JWT_SECRET"))
token, err = generateJwtToken(payload, jwtSecret)
if err != nil {
return "", "", err
}
refreshToken, err = generateRefreshToken(JwtRefreshPayload{JwtToken: token}, jwtSecret)
if err != nil {
return "", "", err
}
return token, refreshToken, nil
}
func generateRefreshToken(payload JwtRefreshPayload, jwtSecret []byte) (string, error) {
claims := jwt.MapClaims{}
claims["jwtToken"] = payload.JwtToken
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
tokenString, err := token.SignedString(jwtSecret)
return tokenString, err
}
func generateJwtToken(payload *JwtPayload, jwtSecret []byte) (string, error) {
claims := jwt.MapClaims{}
claims["username"] = payload.Username
claims["admin"] = payload.Admin
claims["userId"] = payload.UserId
claims["theme"] = payload.Theme
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
tokenString, err := token.SignedString(jwtSecret)
return tokenString, err
}
func refreshTokens(ctx *gin.Context) (jwtPayload *JwtPayload, err error) {
refreshCookie, err := ctx.Request.Cookie("refreshToken")
if err != nil {
return nil, err
}
refreshPayload, err := VerifyRefreshToken(refreshCookie.Value)
if err != nil {
return nil, err
}
jwtPayload, err = VerifyJwtToken(refreshPayload.JwtToken)
if err != nil {
return nil, err
}
jwtToken, refreshToken, err := GenerateTokens(jwtPayload)
if err != nil {
return nil, err
}
AddAuthCookies(ctx, jwtToken, refreshToken)
return jwtPayload, nil
}