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 } } function withFallbackCompileDomain(url: string) { const u = new URL(url) u.hostname = new URL(getMeta('ol-fallbackCompileDomain')).hostname return u.href } function recordFallbackUsage() { setTimeout(() => { postJSON('/record-user-content-domain-fallback-usage').catch(() => {}) }, 1_000) }