1package config
 2
 3import (
 4	"strings"
 5	"unicode"
 6	"unicode/utf8"
 7)
 8
 9const (
10	siteNameMaxBytes = 64
11	reasonSiteName   = "must be at most 64 bytes of UTF-8 text with a visible character and no control characters (the display-name rule, §3.8)"
12)
13
14func siteNameValid(value string) bool {
15	if value == "" || len(value) > siteNameMaxBytes || !utf8.ValidString(value) {
16		return false
17	}
18	for _, r := range value {
19		if unicode.IsControl(r) {
20			return false
21		}
22	}
23	return strings.IndexFunc(value, siteNameVisible) >= 0
24}
25
26func siteNameVisible(r rune) bool {
27	return !unicode.IsSpace(r) && !unicode.In(r, unicode.Cf, unicode.Variation_Selector, unicode.Other_Default_Ignorable_Code_Point)
28}
29
30func (v *validator) siteName(value string) string {
31	if !v.idx.has("server.site_name") {
32		return ""
33	}
34	switch {
35	case value == "":
36		v.add("server.site_name", reasonEmpty)
37	case !siteNameValid(value):
38		v.add("server.site_name", reasonSiteName)
39	}
40	return value
41}