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import { genericUserAgent, env } from "../../config.js"; |
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import { resolveRedirectingURL } from "../url.js"; |
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function getBest(content) { |
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return content?.filter(v => v.baseUrl || v.url) |
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.map(v => (v.baseUrl = v.baseUrl || v.url, v)) |
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.reduce((a, b) => a?.bandwidth > b?.bandwidth ? a : b); |
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} |
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function extractBestQuality(dashData) { |
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const bestVideo = getBest(dashData.video), |
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bestAudio = getBest(dashData.audio); |
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if (!bestVideo || !bestAudio) return []; |
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return [ bestVideo, bestAudio ]; |
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} |
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async function com_download(id, partId) { |
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const url = new URL(`https://bilibili.com/video/${id}`); |
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if (partId) { |
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url.searchParams.set('p', partId); |
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} |
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const html = await fetch(url, { |
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headers: { |
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"user-agent": genericUserAgent |
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} |
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}) |
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.then(r => r.text()) |
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.catch(() => {}); |
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if (!html) { |
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return { error: "fetch.fail" } |
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} |
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if (!(html.includes('<script>window.__playinfo__=') && html.includes('"video_codecid"'))) { |
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return { error: "fetch.empty" }; |
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} |
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const streamData = JSON.parse( |
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html.split('<script>window.__playinfo__=')[1].split('</script>')[0] |
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); |
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if (streamData.data.timelength > env.durationLimit * 1000) { |
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return { error: "content.too_long" }; |
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} |
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const [ video, audio ] = extractBestQuality(streamData.data.dash); |
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if (!video || !audio) { |
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return { error: "fetch.empty" }; |
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} |
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let filenameBase = `bilibili_${id}`; |
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if (partId) { |
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filenameBase += `_${partId}`; |
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} |
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return { |
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urls: [video.baseUrl, audio.baseUrl], |
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audioFilename: `${filenameBase}_audio`, |
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filename: `${filenameBase}_${video.width}x${video.height}.mp4`, |
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}; |
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} |
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async function tv_download(id) { |
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const url = new URL( |
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'https://api.bilibili.tv/intl/gateway/web/playurl' |
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+ '?s_locale=en_US&platform=web&qn=64&type=0&device=wap' |
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+ '&tf=0&spm_id=bstar-web.ugc-video-detail.0.0&from_spm_id=' |
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); |
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url.searchParams.set('aid', id); |
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const { data } = await fetch(url).then(a => a.json()); |
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if (!data?.playurl?.video) { |
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return { error: "fetch.empty" }; |
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} |
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const [ video, audio ] = extractBestQuality({ |
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video: data.playurl.video.map(s => s.video_resource) |
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.filter(s => s.codecs.includes('avc1')), |
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audio: data.playurl.audio_resource |
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}); |
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if (!video || !audio) { |
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return { error: "fetch.empty" }; |
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} |
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if (video.duration > env.durationLimit * 1000) { |
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return { error: "content.too_long" }; |
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} |
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return { |
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urls: [video.url, audio.url], |
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audioFilename: `bilibili_tv_${id}_audio`, |
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filename: `bilibili_tv_${id}.mp4` |
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}; |
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} |
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export default async function({ comId, tvId, comShortLink, partId }) { |
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if (comShortLink) { |
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const patternMatch = await resolveRedirectingURL(`https://b23.tv/${comShortLink}`); |
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comId = patternMatch?.comId; |
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} |
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if (comId) { |
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return com_download(comId, partId); |
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} else if (tvId) { |
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return tv_download(tvId); |
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} |
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return { error: "fetch.fail" }; |
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} |
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