CORS via Greasemonkey/Tampermonkey
// ==UserScript==
// @name CORS-via-GM
// @description CORS via Greasemonkey/Tampermonkey
// @version 1.01
// @include /^(file:///.*/index.html|https?://(127.0.0.1|192.168.\d+.\d+|localhost)(:\d+)?/(([^/]*/)?bundled/)?(index.html)?)(\?.*|$)/
// @include /\b(pages\.dev|onrender\.com)\b/
// @include /\b(?:github.io|gitlab.io|glitch.me|js.org|eu.org|web.app|netlify.(?:com|app)|now.sh|vercel.(?:com|app)|herokuapp.com|neocities.org)/
// @connect *
// @grant GM_xmlhttpRequest
// @namespace https://greasyfork.org/users/882700
// @license WTFPL
// ==/UserScript==
const CORSViaGM = document.body.appendChild(Object.assign(document.createElement('div'), { id: 'CORSViaGM' }))
addEventListener('fetchViaGM', e => GM_fetch(e.detail.forwardingFetch))
CORSViaGM.init = function (window) {
if (!window) throw 'The `window` parameter must be passed in!'
window.fetch = window.fetchViaGM = fetchViaGM.bind(window)
// Support for service worker
window.forwardingFetch = new BroadcastChannel('forwardingFetch')
window.forwardingFetch.onmessage = async e => {
const req = e.data
const { url } = req
const res = await fetchViaGM(url, req)
const response = await res.blob()
window.forwardingFetch.postMessage({ type: 'fetchResponse', url, response })
}
window._CORSViaGM && window._CORSViaGM.inited.done()
const info = '🙉 CORS-via-GM initiated!'
console.info(info)
return info
}
function GM_fetch(p) {
GM_xmlhttpRequest({
...p.init,
url: p.url, method: p.init.method || 'GET',
onload: responseDetails => p.res(new Response(responseDetails.response, responseDetails))
})
}
function fetchViaGM(url, init) {
let _r
const p = new Promise(r => _r = r)
p.res = _r
p.url = url
p.init = init || {}
dispatchEvent(new CustomEvent('fetchViaGM', { detail: { forwardingFetch: p } }))
return p
}