62 lines
2.3 KiB
Dart
62 lines
2.3 KiB
Dart
/*
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* Copyright (c) 2024-2026 Fabian Freund.
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*
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* This file is part of WebLibre
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* (see https://weblibre.eu).
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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
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* published by the Free Software Foundation, either version 3 of the
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* License, or (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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*/
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import 'package:weblibre/utils/uri_input_parser.dart';
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import 'package:weblibre/utils/uri_policy.dart';
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Uri? tryParseUrl(String? input, {bool eagerParsing = false}) {
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return parseUserInputUrl(
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input,
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policy: SchemePolicy.internalIntent,
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allowSchemelessHosts: eagerParsing,
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);
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}
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/// Generic subdomain labels that don't identify a distinct site. Search engines
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/// routinely redirect between these (e.g. `bing.com` → `www.bing.com`,
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/// `www.youtube.com` → `m.youtube.com`), so they are treated as equivalent when
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/// matching a live URL against a bang template host.
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const _genericHostPrefixes = {'www', 'm', 'mobile'};
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/// Strips a single leading generic subdomain label ([_genericHostPrefixes])
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/// from [host] so hosts differing only by such a prefix compare equal.
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///
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/// `www.bing.com` and `bing.com` → `bing.com`; `m.youtube.com` → `youtube.com`.
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/// Non-generic subdomains (e.g. `cn.bing.com`) are left untouched.
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String normalizeHost(String host) {
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final lower = host.toLowerCase();
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final dot = lower.indexOf('.');
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if (dot <= 0) return lower;
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final label = lower.substring(0, dot);
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if (_genericHostPrefixes.contains(label)) {
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return lower.substring(dot + 1);
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}
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return lower;
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}
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/// All host spellings that should be considered the same site as [host] for the
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/// purposes of bang template lookup: the normalized base plus each generic
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/// subdomain variant.
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Set<String> hostVariants(String host) {
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final base = normalizeHost(host);
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return {base, for (final prefix in _genericHostPrefixes) '$prefix.$base'};
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}
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