mirror of
https://codeberg.org/yeentown/barkey.git
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37 lines
1 KiB
TypeScript
37 lines
1 KiB
TypeScript
/*
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* SPDX-FileCopyrightText: syuilo and misskey-project
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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import * as mfm from '@transfem-org/sfm-js';
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// unique without hash
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// [ http://a/#1, http://a/#2, http://b/#3 ] => [ http://a/#1, http://b/#3 ]
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const removeHash = (x: string) => {
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if (URL.canParse(x)) {
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const url = new URL(x);
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url.hash = '';
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return url.toString();
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} else {
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return x.replace(/#[^#]*$/, '');
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}
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};
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export function extractUrlFromMfm(nodes: mfm.MfmNode[], respectSilentFlag = true): string[] {
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const urls = new Map<string, string>();
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// Single iteration pass to avoid potential DoS in maliciously-constructed notes.
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for (const node of nodes) {
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if ((node.type === 'url') || (node.type === 'link' && (!respectSilentFlag || !node.props.silent))) {
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const url = (node as mfm.MfmUrl | mfm.MfmLink).props.url;
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const key = removeHash(url);
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// Keep the first match only, to preserve existing behavior.
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if (!urls.has(key)) {
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urls.set(key, url);
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}
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}
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}
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return Array.from(urls.values());
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}
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