mirror of https://github.com/Chocobozzz/PeerTube
104 lines
2.8 KiB
TypeScript
104 lines
2.8 KiB
TypeScript
import { wait } from '@root-helpers/utils'
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import { Segment } from '@peertube/p2p-media-loader-core'
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import { basename } from 'path'
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type SegmentsJSON = { [filename: string]: string | { [byterange: string]: string } }
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const maxRetries = 3
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function segmentValidatorFactory (segmentsSha256Url: string, isLive: boolean) {
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let segmentsJSON = fetchSha256Segments(segmentsSha256Url)
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const regex = /bytes=(\d+)-(\d+)/
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return async function segmentValidator (segment: Segment, _method: string, _peerId: string, retry = 1) {
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// Wait for hash generation from the server
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if (isLive) await wait(1000)
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const filename = basename(segment.url)
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const segmentValue = (await segmentsJSON)[filename]
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if (!segmentValue && retry > maxRetries) {
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throw new Error(`Unknown segment name ${filename} in segment validator`)
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}
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if (!segmentValue) {
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console.log('Refetching sha segments for %s.', filename)
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await wait(1000)
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segmentsJSON = fetchSha256Segments(segmentsSha256Url)
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await segmentValidator(segment, _method, _peerId, retry + 1)
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return
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}
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let hashShouldBe: string
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let range = ''
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if (typeof segmentValue === 'string') {
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hashShouldBe = segmentValue
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} else {
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const captured = regex.exec(segment.range)
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range = captured[1] + '-' + captured[2]
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hashShouldBe = segmentValue[range]
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}
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if (hashShouldBe === undefined) {
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throw new Error(`Unknown segment name ${filename}/${range} in segment validator`)
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}
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const calculatedSha = await sha256Hex(segment.data)
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if (calculatedSha !== hashShouldBe) {
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throw new Error(
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`Hashes does not correspond for segment ${filename}/${range}` +
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`(expected: ${hashShouldBe} instead of ${calculatedSha})`
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)
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}
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}
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}
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// ---------------------------------------------------------------------------
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export {
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segmentValidatorFactory
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}
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// ---------------------------------------------------------------------------
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function fetchSha256Segments (url: string) {
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return fetch(url)
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.then(res => res.json() as Promise<SegmentsJSON>)
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.catch(err => {
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console.error('Cannot get sha256 segments', err)
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return {}
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})
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}
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async function sha256Hex (data?: ArrayBuffer) {
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if (!data) return undefined
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if (window.crypto.subtle) {
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return window.crypto.subtle.digest('SHA-256', data)
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.then(data => bufferToHex(data))
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}
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// Fallback for non HTTPS context
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const shaModule = await import('sha.js')
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return new shaModule.sha256().update(Buffer.from(data)).digest('hex')
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}
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// Thanks: https://stackoverflow.com/a/53307879
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function bufferToHex (buffer?: ArrayBuffer) {
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if (!buffer) return ''
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let s = ''
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const h = '0123456789abcdef'
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const o = new Uint8Array(buffer)
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o.forEach((v: any) => s += h[ v >> 4 ] + h[ v & 15 ])
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return s
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}
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