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package cleanhttp
import (
"net/http"
"strings"
"unicode"
)
// HandlerInput provides input options to cleanhttp's handlers
type HandlerInput struct {
ErrStatus int
}
// PrintablePathCheckHandler is a middleware that ensures the request path
// contains only printable runes.
func PrintablePathCheckHandler(next http.Handler, input *HandlerInput) http.Handler {
// Nil-check on input to make it optional
if input == nil {
input = &HandlerInput{
ErrStatus: http.StatusBadRequest,
}
}
// Default to http.StatusBadRequest on error
if input.ErrStatus == 0 {
input.ErrStatus = http.StatusBadRequest
}
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
// Check URL path for non-printable characters
idx := strings.IndexFunc(r.URL.Path, func(c rune) bool {
return !unicode.IsPrint(c)
})
if idx != -1 {
w.WriteHeader(input.ErrStatus)
return
}
next.ServeHTTP(w, r)
return
})
}
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