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59 lines
1.2 KiB
59 lines
1.2 KiB
package api
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import (
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"errors"
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"net/http"
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"github.com/mediocregopher/blog.mediocregopher.com/srv/api/apiutil"
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)
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const (
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csrfTokenCookieName = "csrf_token"
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csrfTokenHeaderName = "X-CSRF-Token"
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csrfTokenFormName = "csrfToken"
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)
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func setCSRFMiddleware(h http.Handler) http.Handler {
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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csrfTok, err := apiutil.GetCookie(r, csrfTokenCookieName, "")
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if err != nil {
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apiutil.InternalServerError(rw, r, err)
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return
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} else if csrfTok == "" {
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http.SetCookie(rw, &http.Cookie{
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Name: csrfTokenCookieName,
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Value: apiutil.RandStr(32),
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Secure: true,
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})
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}
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h.ServeHTTP(rw, r)
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})
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}
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func checkCSRFMiddleware(h http.Handler) http.Handler {
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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csrfTok, err := apiutil.GetCookie(r, csrfTokenCookieName, "")
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if err != nil {
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apiutil.InternalServerError(rw, r, err)
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return
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}
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givenCSRFTok := r.Header.Get(csrfTokenHeaderName)
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if givenCSRFTok == "" {
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givenCSRFTok = r.FormValue(csrfTokenFormName)
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}
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if csrfTok == "" || givenCSRFTok != csrfTok {
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apiutil.BadRequest(rw, r, errors.New("invalid CSRF token"))
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return
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}
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h.ServeHTTP(rw, r)
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})
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}
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