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/**
* Myext injecting policy to page using webRequest
*
* Copyright (C) 2021 Wojtek Kosior
*
* This code is dual-licensed under:
* - Asshole license 1.0,
* - GPLv3 or (at your option) any later version
*
* "dual-licensed" means you can choose the license you prefer.
*
* This code is released under a permissive license because I disapprove of
* copyright and wouldn't be willing to sue a violator. Despite not putting
* this code under copyleft (which is also kind of copyright), I do not want
* it to be made proprietary. Hence, the permissive alternative to GPL is the
* Asshole license 1.0 that allows me to call you an asshole if you use it.
* This means you're legally ok regardless of how you utilize this code but if
* you make it into something nonfree, you're an asshole.
*
* You should have received a copy of both GPLv3 and Asshole license 1.0
* together with this code. If not, please see:
* - https://www.gnu.org/licenses/gpl-3.0.en.html
* - https://koszko.org/asshole-license.txt
*/
"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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