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import { basename, dirname } from 'path'
class RedundancyUrlManager {
// Remember by what new URL we replaced an origin URL
private replacedSegmentUrls: { [originUrl: string]: string } = {}
constructor (private baseUrls: string[] = []) {
// empty
}
removeBySegmentUrl (segmentUrl: string) {
console.log('Removing redundancy of segment URL %s.', segmentUrl)
const baseUrl = dirname(segmentUrl)
this.baseUrls = this.baseUrls.filter(u => u !== baseUrl && u !== baseUrl + '/')
}
removeByOriginUrl (originUrl: string) {
const replaced = this.replacedSegmentUrls[originUrl]
if (!replaced) return
return this.removeBySegmentUrl(replaced)
}
buildUrl (url: string) {
delete this.replacedSegmentUrls[url]
const max = this.baseUrls.length + 1
const i = this.getRandomInt(max)
if (i === max - 1) return url
const newBaseUrl = this.baseUrls[i]
const slashPart = newBaseUrl.endsWith('/') ? '' : '/'
const newUrl = newBaseUrl + slashPart + basename(url)
this.replacedSegmentUrls[url] = newUrl
return newUrl
}
countBaseUrls () {
return this.baseUrls.length
}
private getRandomInt (max: number) {
return Math.floor(Math.random() * Math.floor(max))
}
}
// ---------------------------------------------------------------------------
export {
RedundancyUrlManager
}
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