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80 lines
2.2 KiB
JavaScript
80 lines
2.2 KiB
JavaScript
4 years ago
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import { getAssetFromKV, mapRequestToAsset } from '@cloudflare/kv-asset-handler'
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/**
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* The DEBUG flag will do two things that help during development:
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* 1. we will skip caching on the edge, which makes it easier to
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* debug.
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* 2. we will return an error message on exception in your Response rather
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* than the default 404.html page.
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*/
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const DEBUG = false
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addEventListener('fetch', event => {
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try {
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event.respondWith(handleEvent(event))
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} catch (e) {
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if (DEBUG) {
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return event.respondWith(
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new Response(e.message || e.toString(), {
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status: 500,
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}),
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)
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}
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event.respondWith(new Response('Internal Error', { status: 500 }))
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}
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})
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async function handleEvent(event) {
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const url = new URL(event.request.url)
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let options = {}
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/**
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* You can add custom logic to how we fetch your assets
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* by configuring the function `mapRequestToAsset`
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*/
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// options.mapRequestToAsset = handlePrefix(/^\/docs/)
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try {
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if (DEBUG) {
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// customize caching
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options.cacheControl = {
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bypassCache: true,
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}
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}
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return await getAssetFromKV(event, options)
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} catch (e) {
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// if an error is thrown try to serve the asset at 404.html
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if (!DEBUG) {
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try {
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let notFoundResponse = await getAssetFromKV(event, {
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mapRequestToAsset: req => new Request(`${new URL(req.url).origin}/404.html`, req),
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})
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return new Response(notFoundResponse.body, { ...notFoundResponse, status: 404 })
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} catch (e) {}
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}
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return new Response(e.message || e.toString(), { status: 500 })
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}
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}
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/**
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* Here's one example of how to modify a request to
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* remove a specific prefix, in this case `/docs` from
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* the url. This can be useful if you are deploying to a
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* route on a zone, or if you only want your static content
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* to exist at a specific path.
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*/
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function handlePrefix(prefix) {
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return request => {
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// compute the default (e.g. / -> index.html)
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let defaultAssetKey = mapRequestToAsset(request)
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let url = new URL(defaultAssetKey.url)
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// strip the prefix from the path for lookup
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url.pathname = url.pathname.replace(prefix, '/')
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// inherit all other props from the default request
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return new Request(url.toString(), defaultAssetKey)
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}
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}
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