68 lines
1.8 KiB
Go
68 lines
1.8 KiB
Go
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package idna implements IDNA2008 (Internationalized Domain Names for
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// Applications), defined in RFC 5890, RFC 5891, RFC 5892, RFC 5893 and
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// RFC 5894.
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package idna // import "golang.org/x/net/idna"
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import (
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"strings"
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"unicode/utf8"
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)
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// TODO(nigeltao): specify when errors occur. For example, is ToASCII(".") or
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// ToASCII("foo\x00") an error? See also http://www.unicode.org/faq/idn.html#11
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// acePrefix is the ASCII Compatible Encoding prefix.
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const acePrefix = "xn--"
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// ToASCII converts a domain or domain label to its ASCII form. For example,
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// ToASCII("bücher.example.com") is "xn--bcher-kva.example.com", and
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// ToASCII("golang") is "golang".
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func ToASCII(s string) (string, error) {
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if ascii(s) {
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return s, nil
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}
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labels := strings.Split(s, ".")
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for i, label := range labels {
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if !ascii(label) {
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a, err := encode(acePrefix, label)
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if err != nil {
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return "", err
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}
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labels[i] = a
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}
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}
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return strings.Join(labels, "."), nil
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}
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// ToUnicode converts a domain or domain label to its Unicode form. For example,
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// ToUnicode("xn--bcher-kva.example.com") is "bücher.example.com", and
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// ToUnicode("golang") is "golang".
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func ToUnicode(s string) (string, error) {
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if !strings.Contains(s, acePrefix) {
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return s, nil
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}
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labels := strings.Split(s, ".")
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for i, label := range labels {
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if strings.HasPrefix(label, acePrefix) {
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u, err := decode(label[len(acePrefix):])
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if err != nil {
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return "", err
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}
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labels[i] = u
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}
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}
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return strings.Join(labels, "."), nil
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}
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func ascii(s string) bool {
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for i := 0; i < len(s); i++ {
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if s[i] >= utf8.RuneSelf {
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return false
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}
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}
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return true
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}
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