overleaf/services/web/frontend/js/features/pdf-preview/util/fetchFromCompileDomain.ts
Jakob Ackermann 1f14e08fa1 Merge pull request #11442 from overleaf/jpa-hybrid-pdf-download
[web] add hybrid download of compile output

GitOrigin-RevId: b9c6dfc86e3af2f7b1728e791f074ec6d5e0badf
2023-01-27 09:04:12 +00:00

55 lines
1.7 KiB
TypeScript

import { isNetworkError } from '../../../utils/isNetworkError'
import getMeta from '../../../utils/meta'
import OError from '@overleaf/o-error'
import { postJSON } from '../../../infrastructure/fetch-json'
let useFallbackDomainUntil = performance.now()
const ONE_HOUR_IN_MS = 1000 * 60 * 60
export async function fetchFromCompileDomain(url: string, init: RequestInit) {
const userContentDomain = getMeta('ol-compilesUserContentDomain')
let isUserContentDomain =
userContentDomain &&
new URL(url).hostname === new URL(userContentDomain).hostname
if (useFallbackDomainUntil > performance.now()) {
isUserContentDomain = false
url = withFallbackCompileDomain(url)
}
try {
return await fetch(url, init)
} catch (err) {
if (isNetworkError(err) && isUserContentDomain) {
try {
const res = await fetch(withFallbackCompileDomain(url), init)
// Only switch to the fallback when fetch does not throw there as well.
if (useFallbackDomainUntil < performance.now()) {
useFallbackDomainUntil = performance.now() + ONE_HOUR_IN_MS
recordFallbackUsage()
}
return res
} catch (err2: any) {
throw OError.tag(err2, 'fallback request failed', {
errUserContentDomain: err,
})
}
}
throw err
}
}
export function swapDomain(url: string, domain: string) {
const u = new URL(url)
u.hostname = new URL(domain).hostname
return u.href
}
function withFallbackCompileDomain(url: string) {
return swapDomain(url, getMeta('ol-fallbackCompileDomain'))
}
function recordFallbackUsage() {
setTimeout(() => {
postJSON('/record-user-content-domain-fallback-usage').catch(() => {})
}, 1_000)
}