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/**
* This file is part of Haketilo.
*
* Function: Content scripts - main script.
*
* Copyright (C) 2022 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 of this code in a
* proprietary program, I am not going to enforce this in court.
*/
#IMPORT content/repo_query_cacher.js
#FROM common/browser.js IMPORT browser
#FROM common/misc.js IMPORT is_privileged_url
#FROM common/policy.js IMPORT decide_policy, fallback_policy
#FROM content/policy_enforcing.js IMPORT enforce_blocking
#IF CHROMIUM && MV2
function synchronously_get_policy(url)
{
const encoded_url = encodeURIComponent(url);
const request_url = `${browser.runtime.getURL("dummy")}?url=${encoded_url}`;
try {
var xhttp = new XMLHttpRequest();
xhttp.open("GET", request_url, false);
xhttp.send();
} catch(e) {
console.error("Failure to synchronously fetch policy for url.", e);
return fallback_policy();
}
try {
const policy = /^[^?]*\?settings=(.*)$/.exec(xhttp.responseURL)[1];
return JSON.parse(decodeURIComponent(policy));
} catch(e) {
console.error("Failure to process synchronously fetched policy for url.", e);
return fallback_policy()
}
}
#ENDIF
let already_run = false, resolve_page_info,
page_info_prom = new Promise(cb => resolve_page_info = cb);
function on_page_info_request([type], sender, respond_cb) {
if (type !== "page_info")
return;
page_info_prom.then(respond_cb);
return true;
}
#IF MOZILLA || MV3
globalThis.haketilo_content_script_main = async function() {
#ELSE
async function main() {
#ENDIF
if (already_run)
return;
already_run = true;
if (is_privileged_url(document.URL))
return;
browser.runtime.onMessage.addListener(on_page_info_request);
repo_query_cacher.start();
#IF MOZILLA || MV3
try {
var policy = decide_policy(globalThis.haketilo_pattern_tree,
document.URL,
globalThis.haketilo_default_allow,
globalThis.haketilo_secret);
} catch(e) {
console.error(e);
var policy = fallback_policy();
}
#ELSE
const policy = synchronously_get_policy(document.URL);
#ENDIF
const page_info = Object.assign({url: document.URL}, policy);
["csp", "nonce"].forEach(prop => delete page_info[prop]);
if ("payload" in policy) {
const msg = ["indexeddb_files", policy.payload.identifier];
var scripts_prom = browser.runtime.sendMessage(msg);
}
await enforce_blocking(policy);
if ("payload" in policy) {
const script_response = await scripts_prom;
if ("error" in script_response) {
resolve_page_info(Object.assign(page_info, script_response));
return;
} else {
for (const script_contents of script_response.files) {
const html_ns = "http://www.w3.org/1999/xhtml";
const script = document.createElementNS(html_ns, "script");
const blobby_opts = {type: "text/javascript;charset=UTF-8"};
const blobby = new Blob([script_contents], blobby_opts);
script.src = URL.createObjectURL(blobby);
script.setAttribute("nonce", policy.nonce);
document.documentElement.append(script);
script.remove();
}
}
}
resolve_page_info(page_info);
}
#IF MOZILLA || MV3
function main() {
if (globalThis.haketilo_pattern_tree !== undefined)
globalThis.haketilo_content_script_main();
}
#ENDIF
#IF !UNIT_TEST
main();
#ENDIF
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