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