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/**
* This file is part of Haketilo.
*
* Function: Main background script.
*
* Copyright (C) 2021 Wojtek Kosior
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* As additional permission under GNU GPL version 3 section 7, you
* may distribute forms of that code without the copy of the GNU
* GPL normally required by section 4, provided you include this
* license notice and, in case of non-source distribution, a URL
* through which recipients can access the Corresponding Source.
* If you modify file(s) with this exception, you may extend this
* exception to your version of the file(s), but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* As a special exception to the GPL, any HTML file which merely
* makes function calls to this code, and for that purpose
* includes it by reference shall be deemed a separate work for
* copyright law purposes. If you modify this code, you may extend
* this exception to your version of the code, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* I, Wojtek Kosior, thereby promise not to sue for violation of this file's
* license. Although I request that you do not make use this code in a
* proprietary program, I am not going to enforce this in court.
*/
/*
* IMPORTS_START
* IMPORT TYPE_PREFIX
* IMPORT get_storage
* IMPORT light_storage
* IMPORT start_storage_server
* IMPORT start_page_actions_server
* IMPORT browser
* IMPORT is_privileged_url
* IMPORT query_best
* IMPORT gen_nonce
* IMPORT inject_csp_headers
* IMPORT apply_stream_filter
* IMPORT filter_cookie_headers
* IMPORT is_chrome
* IMPORTS_END
*/
start_storage_server();
start_page_actions_server();
async function init_ext(install_details)
{
if (install_details.reason != "install")
return;
let storage = await get_storage();
await storage.clear();
/*
* Below we add sample settings to the extension.
*/
for (let setting of // The next line is replaced with the contents of /default_settings.json by the build script
`DEFAULT SETTINGS`
) {
let [key, value] = Object.entries(setting)[0];
storage.set(key[0], key.substring(1), value);
}
}
browser.runtime.onInstalled.addListener(init_ext);
let storage;
let policy_observable = {};
function on_headers_received(details)
{
const url = details.url;
if (is_privileged_url(details.url))
return;
const [pattern, settings] = query_best(storage, details.url);
const has_payload = !!(settings && settings.components);
const allow = !has_payload &&
!!(settings ? settings.allow : policy_observable.value);
const nonce = gen_nonce();
const policy = {allow, url, nonce, has_payload};
let headers = details.responseHeaders;
let skip = false;
for (const header of headers) {
if ((header.name.toLowerCase().trim() === "content-disposition" &&
/^\s*attachment\s*(;.*)$/i.test(header.value)))
skip = true;
}
headers = inject_csp_headers(headers, policy);
skip = skip || (details.statusCode >= 300 && details.statusCode < 400);
if (!skip) {
/* Check for API availability. */
if (browser.webRequest.filterResponseData)
headers = apply_stream_filter(details, headers, policy);
}
return {responseHeaders: headers};
}
function on_before_send_headers(details)
{
let headers = details.requestHeaders;
headers = filter_cookie_headers(headers);
return {requestHeaders: headers};
}
const all_types = [
"main_frame", "sub_frame", "stylesheet", "script", "image", "font",
"object", "xmlhttprequest", "ping", "csp_report", "media", "websocket",
"other", "main_frame", "sub_frame"
];
async function start_webRequest_operations()
{
storage = await get_storage();
const extra_opts = ["blocking"];
if (is_chrome)
extra_opts.push("extraHeaders");
browser.webRequest.onHeadersReceived.addListener(
on_headers_received,
{urls: ["<all_urls>"], types: ["main_frame", "sub_frame"]},
extra_opts.concat("responseHeaders")
);
browser.webRequest.onBeforeSendHeaders.addListener(
on_before_send_headers,
{urls: ["<all_urls>"], types: all_types},
extra_opts.concat("requestHeaders")
);
policy_observable = await light_storage.observe_var("default_allow");
}
start_webRequest_operations();
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