Created
September 4, 2018 23:10
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Cloudflare Worker to normalise URLs for cache efficiency
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addEventListener('fetch', event => { | |
event.respondWith(handleRequest(event.request)); | |
}) | |
/** | |
* Fetch request after making casing of hash prefix uniform | |
* @param {Request} request | |
*/ | |
async function handleRequest(request) { | |
if(request.method === 'OPTIONS') { | |
let responseHeaders = setCorsHeaders(new Headers()) | |
return new Response('', {headers:responseHeaders}) | |
} | |
const url = new URL(request.url); | |
if (!url.pathname.startsWith("/range/")) { | |
const response = await fetch(request) | |
return response; | |
} | |
const prefix = url.pathname.substr(7); | |
const newRequest = "https://api.pwnedpasswords.com/range/" + prefix.toUpperCase() | |
if (prefix === prefix.toUpperCase()) { | |
const response = await fetch(request, { cf: { cacheKey: newRequest } }) | |
return response; | |
} | |
const init = { | |
method: request.method, | |
headers: request.headers | |
} | |
const modifiedRequest = new Request(newRequest, init) | |
const response = await fetch(modifiedRequest, { cf: { cacheKey: newRequest } }) | |
return response | |
} | |
function setCorsHeaders(headers) { | |
headers.set('Access-Control-Allow-Origin', '*') | |
headers.set('Access-Control-Allow-Methods', 'GET') | |
headers.set('Access-Control-Allow-Headers', 'access-control-allow-headers') | |
headers.set('Access-Control-Max-Age', 1728000) | |
return headers | |
} |
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