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