musescore-downloader/src/mscz.ts

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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): Promise<ArrayBuffer> => {
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 { Key } = await r0.json()
const r = await fetch(`https://ipfs.infura.io/ipfs/${Key as string}`)
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assertRes(r)
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const data = await r.arrayBuffer()
return data
})()
scoreinfo.store.set(MSCZ_BUF_SYM, msczBufferP)
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}
return msczBufferP
}
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export const downloadMscz = async (scoreinfo: ScoreInfo): Promise<void> => {
const data = new Blob([await fetchMscz(scoreinfo)])
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const filename = scoreinfo.fileName
saveAs(data, `${filename}.mscz`)
}