Created
February 26, 2023 05:06
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cloudflare worker egybest crosproxy.js
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// We support the GET, POST, HEAD, and OPTIONS methods from any origin, | |
// and allow any header on requests. These headers must be present | |
// on all responses to all CORS preflight requests. In practice, this means | |
// all responses to OPTIONS requests. | |
const corsHeaders = { | |
"Access-Control-Allow-Origin": "https://cinema2gether.herokuapp.com", | |
"Access-Control-Allow-Methods": "GET,HEAD,POST,OPTIONS", | |
"Access-Control-Max-Age": "86400", | |
} | |
// The URL for the remote third party API you want to fetch from | |
// but does not implement CORS | |
const API_URL = "https://examples.cloudflareworkers.com/demos/demoapi" | |
// The endpoint you want the CORS reverse proxy to be on | |
const PROXY_ENDPOINT = "/corsproxy/" | |
// The rest of this snippet for the demo page | |
async function rawHtmlResponse(html) { | |
return new Response(html, { | |
headers: { | |
"content-type": "text/html;charset=UTF-8", | |
}, | |
}) | |
} | |
const DEMO_PAGE = `Hello World` | |
async function handleRequest(request) { | |
const url = new URL(request.url) | |
let apiUrl = url.pathname.replace(PROXY_ENDPOINT+"https:/","https://"); | |
if (apiUrl == null) { | |
apiUrl = API_URL | |
} | |
// Rewrite request to point to API url. This also makes the request mutable | |
// so we can add the correct Origin header to make the API server think | |
// that this request isn't cross-site. | |
request = new Request(apiUrl, request) | |
request.headers.set("Origin", new URL(apiUrl).origin) | |
let response = await fetch(request) | |
// Recreate the response so we can modify the headers | |
response = new Response(response.body, response) | |
// Set CORS headers | |
response.headers.set("Access-Control-Allow-Origin", "*") | |
// Append to/Add Vary header so browser will cache response correctly | |
response.headers.append("Vary", "Origin") | |
return response | |
} | |
function handleOptions(request) { | |
// Make sure the necessary headers are present | |
// for this to be a valid pre-flight request | |
let headers = request.headers; | |
if ( | |
headers.get("Origin") !== null && | |
headers.get("Access-Control-Request-Method") !== null && | |
headers.get("Access-Control-Request-Headers") !== null | |
){ | |
// Handle CORS pre-flight request. | |
// If you want to check or reject the requested method + headers | |
// you can do that here. | |
let respHeaders = { | |
...corsHeaders, | |
// Allow all future content Request headers to go back to browser | |
// such as Authorization (Bearer) or X-Client-Name-Version | |
"Access-Control-Allow-Headers": request.headers.get("Access-Control-Request-Headers"), | |
} | |
return new Response(null, { | |
headers: respHeaders, | |
}) | |
} | |
else { | |
// Handle standard OPTIONS request. | |
// If you want to allow other HTTP Methods, you can do that here. | |
return new Response(null, { | |
headers: { | |
Allow: "GET, HEAD, POST, OPTIONS", | |
}, | |
}) | |
} | |
} | |
async function handleEGYBESTRequest(request) { | |
let url = new URL(request.url) | |
url = url.pathname.replace("/egybest/",""); | |
const res = await fetch("http://cinema2gether.herokuapp.com/egybest/"+url) | |
if(res.ok){ | |
value = await res.text() | |
return new Response(value,{ headers:{...corsHeaders,"Content-Type":"audio/x-mpegurl"}}) | |
} | |
else{ | |
return new Response("Value not found", {status: 404}) | |
} | |
} | |
addEventListener("fetch", event => { | |
const request = event.request | |
const url = new URL(request.url) | |
if(url.pathname.startsWith(PROXY_ENDPOINT)){ | |
if (request.method === "OPTIONS") { | |
// Handle CORS preflight requests | |
event.respondWith(handleOptions(request)) | |
} | |
else if( | |
request.method === "GET" || | |
request.method === "HEAD" || | |
request.method === "POST" | |
){ | |
// Handle requests to the API server | |
event.respondWith(handleRequest(request)) | |
} | |
else { | |
event.respondWith( | |
new Response(null, { | |
status: 405, | |
statusText: "Method Not Allowed", | |
}), | |
) | |
} | |
} else if(url.pathname.startsWith("/egybest")){ | |
event.respondWith(handleEGYBESTRequest(request)) | |
} | |
else { | |
// Serve demo page | |
event.respondWith(rawHtmlResponse(DEMO_PAGE)) | |
} | |
}) |
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