mirror of
https://github.com/foxcpp/maddy.git
synced 2025-04-03 05:07:38 +03:00
85 lines
2.2 KiB
Go
85 lines
2.2 KiB
Go
/*
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Maddy Mail Server - Composable all-in-one email server.
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Copyright © 2019-2020 Max Mazurov <fox.cpp@disroot.org>, Maddy Mail Server contributors
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package address
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import (
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"errors"
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"golang.org/x/net/idna"
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"golang.org/x/text/unicode/norm"
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)
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var ErrUnicodeMailbox = errors.New("address: cannot convert the Unicode local-part to the ACE form")
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// ToASCII converts the domain part of the email address to the A-label form and
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// fails with ErrUnicodeMailbox if the local-part contains non-ASCII characters.
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func ToASCII(addr string) (string, error) {
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mbox, domain, err := Split(addr)
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if err != nil {
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return addr, err
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}
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for _, ch := range mbox {
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if ch > 128 {
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return addr, ErrUnicodeMailbox
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}
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}
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if domain == "" {
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return mbox, nil
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}
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aDomain, err := idna.ToASCII(domain)
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if err != nil {
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return addr, err
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}
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return mbox + "@" + aDomain, nil
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}
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// ToUnicode converts the domain part of the email address to the U-label form.
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func ToUnicode(addr string) (string, error) {
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mbox, domain, err := Split(addr)
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if err != nil {
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return norm.NFC.String(addr), err
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}
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if domain == "" {
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return mbox, nil
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}
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uDomain, err := idna.ToUnicode(domain)
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if err != nil {
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return norm.NFC.String(addr), err
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}
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return mbox + "@" + norm.NFC.String(uDomain), nil
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}
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// SelectIDNA is a convenience function for conversion of domains in the email
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// addresses to/from the Punycode form.
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//
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// ulabel=true => ToUnicode is used.
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// ulabel=false => ToASCII is used.
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func SelectIDNA(ulabel bool, addr string) (string, error) {
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if ulabel {
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return ToUnicode(addr)
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}
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return ToASCII(addr)
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}
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