32 lines
956 B
TypeScript
32 lines
956 B
TypeScript
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import { saveAs, assertRes } from './utils'
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import { ScoreInfo } from './scoreinfo'
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const MSCZ_BUF_SYM = Symbol('msczBufferP')
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export const fetchMscz = async (scoreinfo: ScoreInfo, _fetch = fetch): Promise<ArrayBuffer> => {
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let msczBufferP = scoreinfo.store.get(MSCZ_BUF_SYM) as Promise<ArrayBuffer> | undefined
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if (!msczBufferP) {
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const url = scoreinfo.msczCidUrl
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msczBufferP = (async (): Promise<ArrayBuffer> => {
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const r0 = await _fetch(url)
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assertRes(r0)
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const cidRes = await r0.json()
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const r = await _fetch(scoreinfo.getMsczUrl(cidRes))
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assertRes(r)
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const data = await r.arrayBuffer()
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return data
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})()
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scoreinfo.store.set(MSCZ_BUF_SYM, msczBufferP)
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}
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return msczBufferP
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}
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export const downloadMscz = async (scoreinfo: ScoreInfo): Promise<void> => {
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const data = new Blob([await fetchMscz(scoreinfo)])
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const filename = scoreinfo.fileName
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saveAs(data, `${filename}.mscz`)
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}
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