45 lines
1.4 KiB
Go
45 lines
1.4 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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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 Affero 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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//
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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 Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package util
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import (
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"strings"
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"golang.org/x/net/idna"
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)
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// Punify converts the given domain to lowercase
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// then to punycode (for international domain names).
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//
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// Returns the resulting domain or an error if the
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// punycode conversion fails.
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func Punify(domain string) (string, error) {
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domain = strings.ToLower(domain)
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return idna.ToASCII(domain)
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}
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// DePunify converts the given punycode string
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// to its original unicode representation (lowercased).
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// Noop if the domain is (already) not puny.
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//
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// Returns an error if conversion fails.
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func DePunify(domain string) (string, error) {
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out, err := idna.ToUnicode(domain)
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return strings.ToLower(out), err
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}
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