59 lines
1.5 KiB
TypeScript
59 lines
1.5 KiB
TypeScript
import { useState, useEffect } from 'react'
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import { useRouter } from 'next/router'
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const MAX_CACHE = 5000 // milliseconds
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const RETRY = 500 // milliseconds
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type LanguageItem = {
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name: string
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nativeName?: string
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code: string
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hreflang: string
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wip?: boolean
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}
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type Session = {
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isSignedIn: boolean
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csrfToken: string
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userLanguage: string // en, es, ja, cn
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languages: Record<string, LanguageItem> // en... name nativeName code hreflang redirectPatterns dir wip
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theme: object // colorMode, nightTheme, dayTheme
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themeCSS: object // colorMode, nightTheme, dayTheme
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}
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let sessionCache: Session | null
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let lastUpdate: number | null
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function isCacheValid() {
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return lastUpdate && Date.now() - lastUpdate < MAX_CACHE
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}
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export function getSession() {
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return sessionCache
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}
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// This function must only be called in the browser
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export async function fetchSession(): Promise<Session | null> {
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if (isCacheValid()) return sessionCache
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lastUpdate = Date.now()
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const response = await fetch('/api/session')
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if (response.ok) {
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sessionCache = await response.json()
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return sessionCache as Session
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}
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sessionCache = null
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await new Promise((resolve) => setTimeout(resolve, RETRY))
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return fetchSession()
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}
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// React hook version
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export function useSession() {
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const [session, setSession] = useState<Session | null>(sessionCache)
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const { asPath } = useRouter()
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// Only call `fetchSession` on the client
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useEffect(() => {
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fetchSession().then((session) => setSession(session))
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}, [asPath])
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return session
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}
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