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43 lines
887 B
43 lines
887 B
package http
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import (
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"errors"
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"net"
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"net/http"
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"net/url"
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"github.com/mediocregopher/blog.mediocregopher.com/srv/http/apiutil"
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)
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func checkCSRF(r *http.Request, publicURL *url.URL) error {
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if ipStr, _, err := net.SplitHostPort(r.Host); err == nil {
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if ip := net.ParseIP(ipStr); ip != nil && ip.IsLoopback() {
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return nil
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}
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}
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refererURL, err := url.Parse(r.Referer())
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if err != nil {
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return errors.New("invalid Referer")
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}
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if refererURL.Scheme != publicURL.Scheme ||
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refererURL.Host != publicURL.Host {
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return errors.New("invalid Referer")
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}
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return nil
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}
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func (a *api) checkCSRFMiddleware(h http.Handler) http.Handler {
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return http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
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if err := checkCSRF(r, a.params.PublicURL); err != nil {
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apiutil.BadRequest(rw, r, errors.New("invalid Referer"))
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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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