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middleware.go
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middleware.go
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package middleware
import (
"log"
"net/http"
"strings"
"time"
"github.com/justinas/alice"
"github.com/satyajitnayk/csrf-security/db"
"github.com/satyajitnayk/csrf-security/server/middleware/myJwt"
"github.com/satyajitnayk/csrf-security/server/templates"
)
// using all the handler as there is no library like gin used here
func NewHandler() http.Handler {
return alice.New(recoverHandler, authHandler).ThenFunc(logicHandler)
}
// help in recovery from panic situation
// used as middleware
func recoverHandler(next http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
defer func() {
if err := recover(); err != nil {
log.Panic("Recovered! Panic: %+v", err)
http.Error(w, http.StatusText(500), 500)
}
}()
next.ServeHTTP(w, r)
}
return http.HandlerFunc(fn)
}
func authHandler(next http.Handler) http.Handler {
fn := func(w http.ResponseWriter, r *http.Request) {
switch r.URL.Path {
case "/restricted", "/logout", "/deleteUser":
log.Println("In auth restricted section")
authCookie, authErr := r.Cookie("AuthToken")
if authErr == http.ErrNoCookie {
log.Println("Unauthorized attempt! no auth cookie")
nullifyTokenCookies(&w, r)
http.Error(w, http.StatusText(401), 401)
return
} else if authErr != nil {
log.Panic("panic: %+v", authErr)
nullifyTokenCookies(&w, r)
http.Error(w, http.StatusText(500), 500)
return
}
refreshCookie, refreshErr := r.Cookie("RefreshToken")
if refreshErr == http.ErrNoCookie {
log.Println("Unauthorized attempt! no refresh cookie found")
nullifyTokenCookies(&w, r)
http.Redirect(w, r, "/login", 302)
return
} else if refreshErr != nil {
log.Panic("panic: %+v", refreshErr)
nullifyTokenCookies(&w, r)
http.Error(w, http.StatusText(500), 500)
return
}
requestCsrfToken := grabCsrfFromRequest(r)
log.Println(requestCsrfToken)
// check for jwt validity
authTokenString, refreshTokenString, csrfSecret, err := myJwt.CheckAndRefreshTokens(authCookie.Value, refreshCookie.Value, requestCsrfToken)
if err != nil {
if err.Error() == "Unauthorized" {
log.Println("Unauthorized attempt! JWT not valid!")
http.Error(w, http.StatusText(401), 401)
return
} else {
log.Panic("err not nil")
log.Panic("panic: %+v", err)
http.Error(w, http.StatusText(500), 500)
return
}
}
log.Println("Successfully recreated jwts")
w.Header().Set("Access-Control-Allow-Origin", "*")
setAuthAndRefreshCookies(&w, authTokenString, refreshTokenString)
w.Header().Set("X-CSRF-Token", csrfSecret)
default:
// no check needed
}
next.ServeHTTP(w, r)
}
return http.HandlerFunc(fn)
}
func logicHandler(w http.ResponseWriter, r *http.Request) {
switch r.URL.Path {
case "/restricted":
csrfSecret := grabCsrfFromRequest(r)
templates.RenderTemplate(w, "restricted", &templates.RestrictedPage{CsrfSecret: csrfSecret, SecretMessage: "Hello Satya!!"})
case "/login":
switch r.Method {
case "GET":
case "POST":
default:
}
case "/register":
switch r.Method {
case "GET":
templates.RenderTemplate(w, "register", &templates.RegisterPage{BAlertUser: false, AlertMsg: ""})
case "POST":
r.ParseForm()
log.Println(r.Form)
_, uuid, err := db.FetchUserByUsername(strings.Join(r.Form["username"], ""))
// username exists
if err == nil {
w.WriteHeader(http.StatusUnauthorized)
} else {
// username not exists
role := "user"
uuid, err = db.StoreUser(strings.Join(r.Form["username"], ""), strings.Join(r.Form["password"], ""), role)
if err != nil {
http.Error(w, http.StatusText(500), 500)
}
log.Println("uuid: " + uuid)
authTokenString, refreshTokenString, csrfSecret, err := myJwt.CreateNewTokens(uuid, role)
if err != nil {
http.Error(w, http.StatusText(500), 500)
}
setAuthAndRefreshCookies(&w, authTokenString, refreshTokenString)
w.Header().Set("X-CSRF-Token", csrfSecret)
w.WriteHeader(http.StatusOK)
}
default:
w.WriteHeader(http.StatusMethodNotAllowed)
}
case "/logout":
nullifyTokenCookies(&w, r)
http.Redirect(w, r, "/login", 302)
case "/deleteUser":
default:
}
}
// revoke our cookies
func nullifyTokenCookies(w *http.ResponseWriter, r *http.Request) {
authCookie := http.Cookie{
Name: "AuthToken",
Value: "",
Expires: time.Now().Add(-1000 * time.Hour),
HttpOnly: true,
}
http.SetCookie(*w, &authCookie)
refreshCookie := http.Cookie{
Name: "RefreshToken",
Value: "",
Expires: time.Now().Add(-1000 * time.Hour),
HttpOnly: true,
}
http.SetCookie(*w, &refreshCookie)
// if present, revoke the refresh cookie from our db
RefreshCookie, refreshErr := r.Cookie("RefreshToken")
if refreshErr == http.ErrNoCookie {
// do nothing
return
} else if refreshErr != nil {
log.Panic("panic: %+v")
http.Error(*w, http.StatusText(500), 500)
}
// revoke refersh token
myJwt.RevokeRefreshToken(RefreshCookie.Value)
}
func setAuthAndRefreshCookies(w *http.ResponseWriter, authTokenString string, refreshTokenString string) {
authCookie := http.Cookie{
Name: "AuthToken",
Value: authTokenString,
HttpOnly: true,
}
http.SetCookie(*w, &authCookie)
refreshCookie := http.Cookie{
Name: "RefreshToken",
Value: refreshTokenString,
HttpOnly: true,
}
http.SetCookie(*w, &refreshCookie)
}
// pick csrf from request
func grabCsrfFromRequest(r *http.Request) string {
csrfFromForm := r.FormValue("X-CSRF-Token")
if csrfFromForm != "" {
return csrfFromForm
} else {
return r.Header.Get("X-CSRF-Token")
}
}