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package http
import (
"errors"
"net"
"net/http"
"net/url"
"dev.mediocregopher.com/mediocre-blog.git/src/http/apiutil"
)
func checkCSRF(r *http.Request, publicURL *url.URL) error {
if ipStr, _, err := net.SplitHostPort(r.Host); err == nil {
if ip := net.ParseIP(ipStr); ip != nil && ip.IsLoopback() {
return nil
}
}
refererURL, err := url.Parse(r.Referer())
if err != nil {
return errors.New("invalid Referer")
}
if refererURL.Scheme != publicURL.Scheme ||
refererURL.Host != publicURL.Host {
return errors.New("invalid Referer")
}
return nil
}
func (a *api) checkCSRFMiddleware(h http.Handler) http.Handler {
logger := a.params.Logger.WithNamespace("csrf")
return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
ctx := r.Context()
if err := checkCSRF(r, a.params.PublicURL); err != nil {
apiutil.BadRequest(ctx, logger, rw, "invalid Referer")
return
}
h.ServeHTTP(rw, r)
})
}
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