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/**
* Myext injecting policy to page using webRequest
*
* Copyright (C) 2021 Wojtek Kosior
* Redistribution terms are gathered in the `copyright' file.
*/
"use strict";
(() => {
const TYPE_PREFIX = window.TYPE_PREFIX;
const get_storage = window.get_storage;
const browser = window.browser;
const is_chrome = window.is_chrome;
const gen_unique = window.gen_unique;
const url_item = window.url_item;
const get_query_best = window.get_query_best;
var storage;
var query_best;
let csp_header_names = {
"content-security-policy" : true,
"x-webkit-csp" : true,
"x-content-security-policy" : true
};
function is_noncsp_header(header)
{
return !csp_header_names[header.name.toLowerCase()];
}
function inject(details)
{
let url = url_item(details.url);
let [pattern, settings] = query_best(url);
if (settings !== undefined && settings.allow) {
console.log("allowing", url);
return {cancel : false};
}
let nonce = gen_unique(url).substring(1);
let headers = details.responseHeaders.filter(is_noncsp_header);
headers.push({
name : "content-security-policy",
value : `script-src 'nonce-${nonce}'; script-src-elem 'nonce-${nonce}';`
});
console.log("modified headers", url, headers);
return {responseHeaders: headers};
}
async function start() {
storage = await get_storage();
query_best = await get_query_best();
let extra_opts = ["blocking", "responseHeaders"];
if (is_chrome)
extra_opts.push("extraHeaders");
browser.webRequest.onHeadersReceived.addListener(
inject,
{
urls: ["<all_urls>"],
types: ["main_frame", "sub_frame"]
},
extra_opts
);
}
window.start_policy_injector = start;
})();
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