48 lines
1.2 KiB
Go
48 lines
1.2 KiB
Go
// Copyright 2017 Frédéric Guillot. All rights reserved.
|
|
// Use of this source code is governed by the Apache 2.0
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package middleware
|
|
|
|
import (
|
|
"context"
|
|
"github.com/miniflux/miniflux2/helper"
|
|
"log"
|
|
"net/http"
|
|
)
|
|
|
|
func Csrf(next http.Handler) http.Handler {
|
|
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
|
|
var csrfToken string
|
|
|
|
csrfCookie, err := r.Cookie("csrfToken")
|
|
if err == http.ErrNoCookie || csrfCookie.Value == "" {
|
|
csrfToken = helper.GenerateRandomString(64)
|
|
cookie := &http.Cookie{
|
|
Name: "csrfToken",
|
|
Value: csrfToken,
|
|
Path: "/",
|
|
Secure: r.URL.Scheme == "https",
|
|
HttpOnly: true,
|
|
}
|
|
|
|
http.SetCookie(w, cookie)
|
|
} else {
|
|
csrfToken = csrfCookie.Value
|
|
}
|
|
|
|
ctx := r.Context()
|
|
ctx = context.WithValue(ctx, "CsrfToken", csrfToken)
|
|
|
|
w.Header().Add("Vary", "Cookie")
|
|
isTokenValid := csrfToken == r.FormValue("csrf") || csrfToken == r.Header.Get("X-Csrf-Token")
|
|
|
|
if r.Method == "POST" && !isTokenValid {
|
|
log.Println("[Middleware:CSRF] Invalid or missing CSRF token!")
|
|
w.WriteHeader(http.StatusBadRequest)
|
|
w.Write([]byte("Invalid or missing CSRF token!"))
|
|
} else {
|
|
next.ServeHTTP(w, r.WithContext(ctx))
|
|
}
|
|
})
|
|
}
|