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/**
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* This file is part of Haketilo.
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*
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* Function: Content scripts - main script.
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*
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* Copyright (C) 2022 Wojtek Kosior
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* As additional permission under GNU GPL version 3 section 7, you
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* may distribute forms of that code without the copy of the GNU
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* GPL normally required by section 4, provided you include this
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* license notice and, in case of non-source distribution, a URL
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* through which recipients can access the Corresponding Source.
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* If you modify file(s) with this exception, you may extend this
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* exception to your version of the file(s), but you are not
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* obligated to do so. If you do not wish to do so, delete this
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* exception statement from your version.
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*
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* As a special exception to the GPL, any HTML file which merely
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* makes function calls to this code, and for that purpose
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* includes it by reference shall be deemed a separate work for
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* copyright law purposes. If you modify this code, you may extend
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* this exception to your version of the code, but you are not
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* obligated to do so. If you do not wish to do so, delete this
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* exception statement from your version.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*
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* I, Wojtek Kosior, thereby promise not to sue for violation of this file's
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* license. Although I request that you do not make use of this code in a
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* proprietary program, I am not going to enforce this in court.
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*/
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#IMPORT content/repo_query_cacher.js
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#FROM common/browser.js IMPORT browser
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#FROM common/misc.js IMPORT is_privileged_url
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#FROM common/policy.js IMPORT decide_policy, fallback_policy
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#FROM content/policy_enforcing.js IMPORT enforce_blocking
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#IF CHROMIUM && MV2
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function synchronously_get_policy(url)
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{
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const encoded_url = encodeURIComponent(url);
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const request_url = `${browser.runtime.getURL("dummy")}?url=${encoded_url}`;
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try {
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var xhttp = new XMLHttpRequest();
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xhttp.open("GET", request_url, false);
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xhttp.send();
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} catch(e) {
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console.error("Failure to synchronously fetch policy for url.", e);
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return fallback_policy();
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}
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try {
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const policy = /^[^?]*\?settings=(.*)$/.exec(xhttp.responseURL)[1];
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return JSON.parse(decodeURIComponent(policy));
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} catch(e) {
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console.error("Failure to process synchronously fetched policy for url.", e);
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return fallback_policy()
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}
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}
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#ENDIF
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let already_run = false, resolve_page_info,
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page_info_prom = new Promise(cb => resolve_page_info = cb);
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function on_page_info_request([type], sender, respond_cb) {
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if (type !== "page_info")
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return;
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page_info_prom.then(respond_cb);
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return true;
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}
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#IF MOZILLA || MV3
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globalThis.haketilo_content_script_main = async function() {
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#ELSE
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async function main() {
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#ENDIF
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if (already_run)
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return;
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already_run = true;
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if (is_privileged_url(document.URL))
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return;
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browser.runtime.onMessage.addListener(on_page_info_request);
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repo_query_cacher.start();
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#IF MOZILLA || MV3
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try {
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var policy = decide_policy(globalThis.haketilo_pattern_tree,
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document.URL,
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globalThis.haketilo_default_allow,
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globalThis.haketilo_secret);
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} catch(e) {
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console.error(e);
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var policy = fallback_policy();
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}
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#ELSE
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const policy = synchronously_get_policy(document.URL);
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#ENDIF
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const page_info = Object.assign({url: document.URL}, policy);
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["csp", "nonce"].forEach(prop => delete page_info[prop]);
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if ("payload" in policy) {
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const msg = ["indexeddb_files", policy.payload.identifier];
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var scripts_prom = browser.runtime.sendMessage(msg);
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}
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await enforce_blocking(policy);
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if ("payload" in policy) {
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const script_response = await scripts_prom;
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if ("error" in script_response) {
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resolve_page_info(Object.assign(page_info, script_response));
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return;
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} else {
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for (const script_contents of script_response.files) {
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const html_ns = "http://www.w3.org/1999/xhtml";
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const script = document.createElementNS(html_ns, "script");
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const blobby_opts = {type: "text/javascript;charset=UTF-8"};
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const blobby = new Blob([script_contents], blobby_opts);
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script.src = URL.createObjectURL(blobby);
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script.setAttribute("nonce", policy.nonce);
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document.documentElement.append(script);
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script.remove();
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}
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}
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}
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resolve_page_info(page_info);
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}
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#IF MOZILLA || MV3
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function main() {
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if (globalThis.haketilo_pattern_tree !== undefined)
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globalThis.haketilo_content_script_main();
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}
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#ENDIF
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#IF !UNIT_TEST
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main();
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#ENDIF
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