80 lines
2.4 KiB
TypeScript
80 lines
2.4 KiB
TypeScript
import type { BilibiliVideoReference } from './bilibili-card.types';
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const BILIBILI_HOST = 'bilibili.com';
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const B23_HOST = 'b23.tv';
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const TRAILING_WRAPPERS = /[\s"'<>，。！？、；：）)\]}]+$/u;
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const LEADING_WRAPPERS = /^[\s"'<>（([{]+/u;
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const BVID_PATTERN = /(?:^|\/)(BV[0-9A-Za-z]{10,})/;
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const AID_PATTERN = /(?:^|\/)(?:av|AV)(\d+)(?:$|[/?#])/;
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/**
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* Removes QQ card wrappers and punctuation that often stick to copied URLs.
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* @param candidate - Raw string fragment found in text or card JSON.
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* @returns Cleaned URL candidate ready for `URL` parsing.
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*/
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export function cleanBilibiliUrlCandidate(candidate: string) {
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return candidate
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.replaceAll('&', '&')
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.replaceAll('"', '"')
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.replaceAll('"', '"')
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.replace(LEADING_WRAPPERS, '')
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.replace(TRAILING_WRAPPERS, '')
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.trim();
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}
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/**
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* Checks whether a URL belongs to the Bilibili domains this plugin is allowed to parse.
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* @param candidate - URL string collected from a QQ message or redirect result.
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* @returns `true` when the host is Bilibili-owned or `b23.tv`.
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*/
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export function isAllowedBilibiliUrl(candidate: string) {
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try {
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const url = new URL(cleanBilibiliUrlCandidate(candidate));
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const hostname = url.hostname.toLowerCase();
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return (
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(url.protocol === 'http:' || url.protocol === 'https:') &&
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(hostname === B23_HOST ||
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hostname === BILIBILI_HOST ||
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hostname.endsWith(`.${BILIBILI_HOST}`))
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);
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} catch {
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return false;
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}
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}
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/**
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* Extracts a Bilibili video identifier from a supported URL.
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* @param candidate - Direct Bilibili video URL or short-link URL that already embeds BV/av.
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* @returns Parsed video reference, or `null` when the URL is not a supported video URL.
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*/
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export function parseBilibiliVideoReference(
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candidate: string,
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): BilibiliVideoReference | null {
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const cleaned = cleanBilibiliUrlCandidate(candidate);
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if (!isAllowedBilibiliUrl(cleaned)) return null;
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const url = new URL(cleaned);
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const probe = `${url.pathname}${url.search}${url.hash}`;
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const bvid = probe.match(BVID_PATTERN)?.[1];
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if (bvid) {
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return {
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canonicalVideoId: bvid,
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kind: 'bvid',
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sourceUrl: cleaned,
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value: bvid,
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};
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}
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const aid = `${url.pathname}/`.match(AID_PATTERN)?.[1];
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if (aid) {
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return {
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canonicalVideoId: `av${aid}`,
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kind: 'aid',
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sourceUrl: cleaned,
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value: aid,
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};
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}
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return null;
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}
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