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/*
* NoScript Commons Library
* Reusable building blocks for cross-browser security/privacy WebExtensions.
* Copyright (C) 2020-2023 Giorgio Maone <https://maone.net>
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
* 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.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <https://www.gnu.org/licenses/>.
*/
// depends on /nscl/common/sha256.js
// depends on /nscl/common/uuid.js
"use strict";
var DocStartInjection = (() => {
const MSG_ID = "__DocStartInjection__";
let repeating = !("contentScripts" in browser);
let scriptBuilders = new Set();
let getId = ({requestId, tabId, frameId, url}) => requestId || `${tabId}:${frameId}:${url}`;
let pending = new Map();
function onMessage(msg, sender) {
let payload = msg[MSG_ID];
if (!payload) return;
let {id, tabId, frameId, url} = payload;
let ret = false;
if (tabId === sender.tab.id && frameId === sender.frameId && url === sender.url) {
end(payload, true);
ret = true;
}
return Promise.resolve(ret);
}
async function begin(request) {
let scripts = new Set();
let {tabId, frameId, url} = request;
if (tabId < 0 || !/^(?:(?:https?|ftp|data|blob|file):|about:blank$)/.test(url)) return;
await Promise.all([...scriptBuilders].map(async buildScript => {
try {
let script = await buildScript({tabId, frameId, url});
if (script) scripts.add(`try {
${typeof script === "function" ? `(${script})();` : script}
} catch (e) {
console.error("Error in DocStartInjection script", e);
}`);
} catch (e) {
error("Error calling DocStartInjection scriptBuilder", buildScript, e);
}
}));
if (scripts.size === 0) {
debug(`DocStartInjection: no script to inject in ${url}`);
return;
}
let id = getId(request);
if (repeating) {
let scriptsBlock = [...scripts].join("\n");
let injectionId = `injection:${uuid()}:${await sha256(scriptsBlock)}`;
let args = {
code: `(() => {
let injectionId = ${JSON.stringify(injectionId)};
if (document.readyState === "complete" ||
window[injectionId] ||
document.URL !== ${JSON.stringify(url)}
) return window[injectionId];
window[injectionId] = true;
${scriptsBlock}
return document.readyState === "loading";
})();`,
runAt: "document_start",
frameId,
};
pending.set(id, args);
await run(request, true);
} else {
let matches = [url];
try {
let urlObj = new URL(url);
if (urlObj.port) {
urlObj.port = "";
matches[0] = urlObj.toString();
}
} catch (e) {}
let ackMsg = JSON.stringify({
[MSG_ID]: {id, tabId, frameId, url}
});
scripts.add(`if (document.readyState !== "complete") browser.runtime.sendMessage(${ackMsg});`);
let options = {
js: [...scripts].map(code => ({code})),
runAt: "document_start",
matchAboutBlank: true,
matches,
allFrames: true,
};
let current = pending.get(id);
if (current) {
current.unregister();
}
pending.set(id, await browser.contentScripts.register(options));
}
}
async function run(request, repeat = false) {
let id = getId(request);
let args = pending.get(id);
if (!args) return;
let {url, tabId} = request;
let attempts = 0, success = false;
for (; pending.has(id);) {
attempts++;
try {
if (attempts % 1000 === 0) {
let tab = await browser.tabs.get(request.tabId);
if (tab.url !== url) {
console.error(`Tab mismatch: ${tab.url} <> ${url} (download-triggered?)`);
break;
}
console.error(`DocStartInjection at ${url} ${attempts} failed attempts so far...`);
}
let ret = await browser.tabs.executeScript(tabId, args);
if (success = ret[0]) {
break;
}
} catch (e) {
if (/No tab\b/.test(e.message)) {
break;
}
if (!/\baccess\b/.test(e.message)) {
console.error(e.message);
}
if (attempts % 1000 === 0) {
console.error(`DocStartInjection at ${url} ${attempts} failed attempts`, e);
}
} finally {
if (!repeat) break;
}
}
pending.delete(id);
debug(`DocStartInjection at ${url}, ${attempts} attempts, success = ${success}, repeat = ${repeat}.`);
}
function end(request, immediate = false) {
let id = getId(request);
let script = pending.get(id);
if (script) {
if (repeating) {
run(request, false);
} else {
pending.delete(id);
if (immediate) {
script.unregister();
} else {
setTimeout(() => script.unregister(), 500);
}
}
}
}
let listeners = {
onBeforeNavigate: begin,
onErrorOccurred: end,
onCompleted: end,
}
function listen(enabled) {
let {webNavigation, webRequest} = browser;
let method = `${enabled ? "add" : "remove"}Listener`;
let reqFilter = {urls: ["<all_urls>"], types: ["main_frame", "sub_frame", "object"]};
function setup(api, eventName, listener, ...args) {
let event = api[eventName];
if (event) {
event[method].apply(event, enabled ? [listener, ...args] : [listener]);
}
}
if (repeating) {
// Just Chromium
setup(webRequest, "onResponseStarted", begin, reqFilter);
} else {
// add or remove Firefox's webNavigation listeners for non-http loads
// and asynchronous blocking onHeadersReceived for registration on http
let navFilter = enabled && {url: [{schemes: ["file", "ftp"]}]};
for (let [eventName, listener] of Object.entries(listeners)) {
setup(webNavigation, eventName, listener, navFilter)
}
setup(webRequest, "onHeadersReceived", begin, reqFilter, ["blocking"]);
browser.runtime.onMessage[method](onMessage);
}
// add or remove common webRequest listener
for (let [eventName, listener] of Object.entries(listeners)) {
setup(webRequest, eventName, listener, reqFilter);
}
}
return {
register(scriptBuilder) {
if (scriptBuilders.size === 0) listen(true);
scriptBuilders.add(scriptBuilder);
},
unregister(scriptBuilder) {
scriptBuilders.delete(scriptBuilder);
if (scriptBuilders.size === 0) listen(false);
}
};
})();
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