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scoreinfo.ts
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import { getFetch, escapeFilename, assertRes } from './utils'
import { getMainCid } from './mscz'
export abstract class ScoreInfo {
private readonly RADIX = 20;
private readonly INDEX_RADIX = 32;
abstract id: number;
abstract title: string;
public store = new Map<symbol, any>();
get idLastDigit (): number {
return (+this.id) % this.RADIX
}
get fileName (): string {
return escapeFilename(this.title)
}
public getMsczIpfsRef (mainCid: string): string {
return `/ipfs/${mainCid}/${this.idLastDigit}/${this.id}.mscz`
}
public getMsczCidUrl (mainCid: string): string {
return `https://ipfs.infura.io:5001/api/v0/block/stat?arg=${this.getMsczIpfsRef(mainCid)}`
}
public getScorepackRef (mainCid: string): string {
return `/ipfs/${mainCid}/index/${(+this.id) % this.INDEX_RADIX}/${this.id}`
}
}
export class ScoreInfoObj extends ScoreInfo {
constructor (public id: number = 0, public title: string = '') { super() }
}
export class ScoreInfoInPage extends ScoreInfo {
constructor (private document: Document) { super() }
get id (): number {
const el = this.document.querySelector("meta[property='al:ios:url']") as HTMLMetaElement
const m = el.content.match(/(\d+)$/) as RegExpMatchArray
return +m[1]
}
get title (): string {
const el = this.document.querySelector("meta[property='og:title']") as HTMLMetaElement
return el.content
}
get baseUrl (): string {
const el = this.document.querySelector("meta[property='og:image']") as HTMLMetaElement
const m = el.content.match(/^(.+\/)score_/) as RegExpMatchArray
return m[1]
}
}
export class ScoreInfoHtml extends ScoreInfo {
private readonly ID_REG = /<meta property="al:ios:url" content="musescore:\/\/score\/(\d+)">/
private readonly TITLE_REG = /<meta property="og:title" content="(.*)">/
private readonly BASEURL_REG = /<meta property="og:image" content="(.+\/)score_.*">/
constructor (private html: string) { super() }
get id (): number {
const m = this.html.match(this.ID_REG)
if (!m) return 0
return +m[1]
}
get title (): string {
const m = this.html.match(this.TITLE_REG)
if (!m) return ''
return m[1]
}
get baseUrl (): string {
const m = this.html.match(this.BASEURL_REG)
if (!m) return ''
return m[1]
}
get sheet (): SheetInfo {
return new SheetInfoHtml(this.html)
}
static async request (url: string, _fetch = getFetch()): Promise<ScoreInfoHtml> {
const r = await _fetch(url)
if (!r.ok) return new ScoreInfoHtml('')
const html = await r.text()
return new ScoreInfoHtml(html)
}
}
export type Dimensions = { width: number; height: number }
export abstract class SheetInfo {
abstract pageCount: number;
/** url to the image of the first page */
abstract thumbnailUrl: string;
abstract dimensions: Dimensions;
get imgType (): 'svg' | 'png' {
const thumbnail = this.thumbnailUrl
const imgtype = thumbnail.match(/score_0\.(\w+)/)![1]
return imgtype as 'svg' | 'png'
}
}
export class SheetInfoInPage extends SheetInfo {
constructor (private document: Document) { super() }
private get sheet0Img (): HTMLImageElement | null {
return this.document.querySelector('img[src*=score_]')
}
get pageCount (): number {
const sheet0Div = this.sheet0Img?.parentElement
if (!sheet0Div) {
throw new Error('no sheet images found')
}
return this.document.getElementsByClassName(sheet0Div.className).length
}
get thumbnailUrl (): string {
const el = this.document.querySelector<HTMLLinkElement>('link[as=image]')
const url = (el?.href || this.sheet0Img?.src) as string
return url.split('@')[0]
}
get dimensions (): Dimensions {
const { naturalWidth: width, naturalHeight: height } = this.sheet0Img as HTMLImageElement
return { width, height }
}
}
export class SheetInfoHtml extends SheetInfo {
private readonly PAGE_COUNT_REG = /pages(?:"|"):(\d+),/
private readonly THUMBNAIL_REG = /<link (?:.*) href="(.*)" rel="preload" as="image"/
private readonly DIMENSIONS_REG = /dimensions(?:"|"):(?:"|")(\d+)x(\d+)(?:"|"),/
constructor (private html: string) { super() }
get pageCount (): number {
const m = this.html.match(this.PAGE_COUNT_REG)
if (!m) return NaN
return +m[1]
}
get thumbnailUrl (): string {
const m = this.html.match(this.THUMBNAIL_REG)
if (!m) return ''
return m[1].split('@')[0]
}
get dimensions (): Dimensions {
const m = this.html.match(this.DIMENSIONS_REG)
if (!m) return { width: NaN, height: NaN }
return { width: +m[1], height: +m[2] }
}
}
export const getActualId = async (scoreinfo: ScoreInfoInPage | ScoreInfoHtml, _fetch = getFetch()): Promise<number> => {
if (scoreinfo.id <= 1000000000000) {
// actual id already
return scoreinfo.id
}
const mainCid = await getMainCid(scoreinfo, _fetch)
const ref = `${mainCid}/sid2id/${scoreinfo.id}`
const url = `https://ipfs.infura.io:5001/api/v0/dag/get?arg=${ref}`
const r0 = await _fetch(url)
if (r0.status !== 500) {
assertRes(r0)
}
const res: { Message: string } | number = await r0.json()
if (typeof res !== 'number') {
// read further error msg
throw new Error(res.Message)
}
// assign the actual id back to scoreinfo
Object.defineProperty(scoreinfo, 'id', {
get () { return res },
})
return res
}