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node_modules | ||
worker |
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import { | ||
getAssetFromKV, | ||
mapRequestToAsset, | ||
serveSinglePageApp, | ||
} from '@cloudflare/kv-asset-handler' | ||
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/** | ||
* The DEBUG flag will do two things that help during development: | ||
* 1. we will skip caching on the edge, which makes it easier to | ||
* debug. | ||
* 2. we will return an error message on exception in your Response rather | ||
* than the default 404.html page. | ||
*/ | ||
const DEBUG = false | ||
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addEventListener('fetch', (event) => { | ||
try { | ||
event.respondWith(handleEvent(event)) | ||
} catch (e) { | ||
if (DEBUG) { | ||
return event.respondWith( | ||
new Response(e.message || e.toString(), { | ||
status: 500, | ||
}) | ||
) | ||
} | ||
event.respondWith(new Response('Internal Error', { status: 500 })) | ||
} | ||
}) | ||
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async function handleEvent(event) { | ||
const url = new URL(event.request.url) | ||
let options = { mapRequestToAsset: serveSinglePageApp } | ||
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/** | ||
* You can add custom logic to how we fetch your assets | ||
* by configuring the function `mapRequestToAsset` | ||
*/ | ||
// options.mapRequestToAsset = handlePrefix(/^\/docs/) | ||
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try { | ||
if (DEBUG) { | ||
// customize caching | ||
options.cacheControl = { | ||
bypassCache: true, | ||
} | ||
} | ||
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const page = await getAssetFromKV(event, options) | ||
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// allow headers to be altered | ||
const response = new Response(page.body, page) | ||
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response.headers.set('X-XSS-Protection', '1; mode=block') | ||
response.headers.set('X-Content-Type-Options', 'nosniff') | ||
response.headers.set('X-Frame-Options', 'DENY') | ||
response.headers.set('Referrer-Policy', 'unsafe-url') | ||
response.headers.set('Feature-Policy', 'none') | ||
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return response | ||
} catch (e) { | ||
// if an error is thrown try to serve the asset at 404.html | ||
if (!DEBUG) { | ||
try { | ||
let notFoundResponse = await getAssetFromKV(event, { | ||
mapRequestToAsset: (req) => | ||
new Request(`${new URL(req.url).origin}/404.html`, req), | ||
}) | ||
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return new Response(notFoundResponse.body, { | ||
...notFoundResponse, | ||
status: 404, | ||
}) | ||
} catch (e) {} | ||
} | ||
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return new Response(e.message || e.toString(), { status: 500 }) | ||
} | ||
} | ||
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/** | ||
* Here's one example of how to modify a request to | ||
* remove a specific prefix, in this case `/docs` from | ||
* the url. This can be useful if you are deploying to a | ||
* route on a zone, or if you only want your static content | ||
* to exist at a specific path. | ||
*/ | ||
function handlePrefix(prefix) { | ||
return (request) => { | ||
// compute the default (e.g. / -> index.html) | ||
let defaultAssetKey = mapRequestToAsset(request) | ||
let url = new URL(defaultAssetKey.url) | ||
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// strip the prefix from the path for lookup | ||
url.pathname = url.pathname.replace(prefix, '/') | ||
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// inherit all other props from the default request | ||
return new Request(url.toString(), defaultAssetKey) | ||
} | ||
} |
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{ | ||
"private": true, | ||
"name": "worker", | ||
"version": "1.0.0", | ||
"description": "A template for kick starting a Cloudflare Workers project", | ||
"main": "index.js", | ||
"author": "Ashley Lewis <[email protected]>", | ||
"license": "MIT", | ||
"dependencies": { | ||
"@cloudflare/kv-asset-handler": "~0.1.2" | ||
} | ||
} |