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/**
* @template T
* @param {T[]} arr
* @param {(v: T) => boolean} predicate
*/
function removeFirst(arr, predicate) {
const idx = arr.findIndex(predicate);
if (idx !== -1) arr.splice(idx, 1);
}
chrome.webRequest.onHeadersReceived.addListener(
({ responseHeaders, type, url }) => {
if (!responseHeaders) return;
if (type === "main_frame") {
// In main frame requests, the CSP needs to be removed to enable fetching of custom css
// as desired by the user
removeFirst(responseHeaders, h => h.name.toLowerCase() === "content-security-policy");
} else if (type === "stylesheet" && url.startsWith("https://raw.githubusercontent.com")) {
// Most users will load css from GitHub, but GitHub doesn't set the correct content type,
// so we fix it here
removeFirst(responseHeaders, h => h.name.toLowerCase() === "content-type");
responseHeaders.push({
name: "Content-Type",
value: "text/css"
});
}
return { responseHeaders };
},
{ urls: ["https://raw.githubusercontent.com/*", "*://*.discord.com/*"], types: ["main_frame", "stylesheet"] },
["blocking", "responseHeaders"]
);
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