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'use strict';
// debug = () => {}; // XPI_ONLY
window.canScript = true;
function createHTMLElement(name) {
return document.createElementNS("http://www.w3.org/1999/xhtml", name);
}
function probe() {
try {
debug("Probing execution...");
let s = document.createElement("script");
s.textContent=";";
document.documentElement.appendChild(s);
s.remove();
} catch(e) {
debug(e);
}
}
var _ = browser.i18n.getMessage;
var embeddingDocument = false;
var seen = {
_map: new Map(),
_list: null,
record(event) {
let key = event.request.key;
if (this._map.has(key)) return;
this._map.set(key, event);
this._list = null;
},
get list() {
return this._list || (this._list = [...this._map.values()]);
}
}
var handlers = {
seen(event) {
let {allowed, policyType, request, ownFrame} = event;
if (window.top === window) {
seen.record(event);
}
if (ownFrame) {
init();
if (!allowed && PlaceHolder.canReplace(policyType)) {
request.embeddingDocument = embeddingDocument;
PlaceHolder.create(policyType, request);
}
}
},
collect(event) {
let list = seen.list;
debug("COLLECT", list);
return list;
}
};
browser.runtime.onMessage.addListener(async event => {
if (event.type in handlers) {
debug("Received message", event);
return handlers[event.type](event);
}
});
if (document.readyState !== "complete") {
let pageshown = e => {
removeEventListener("pageshow", pageshown);
init();
};
addEventListener("pageshow", pageshown);
} else {
init(true);
}
let notifyPage = () => {
if (document.readyState === "complete") {
browser.runtime.sendMessage({type: "pageshow", seen, canScript});
return true;
}
return false;
}
var queryingCanScript = false;
var caps = {};
async function init(oldPage = false) {
if (queryingCanScript) return;
if (document.URL === "about:blank") {
return;
}
queryingCanScript = true;
debug(`init() called in document %s, contentType %s readyState %s`,
document.URL, document.contentType, document.readyState);
try {
let {canScript, shouldScript} = await browser.runtime.sendMessage({type: "canScript"});
debug(`document %s, canScript=%s, shouldScript=%s, readyState %s`, document.URL, canScript, shouldScript, document.readyState);
if (canScript) {
if (oldPage) {
probe();
setTimeout(() => init(), 100);
return;
}
if (!shouldScript) {
// Something wrong: scripts can run, permissions say they shouldn't.
// Was webRequest bypassed by caching/session restore/service workers?
let noCache = !!navigator.serviceWorker.controller;
if (noCache) {
for (let r of await navigator.serviceWorker.getRegistrations()) {
await r.unregister();
}
}
debug("Reloading %s (%s)", document.URL, noCache ? "no cache" : "cached");
location.reload(noCache);
return;
}
}
window.canScript = canScript;
init = () => {};
} catch (e) {
debug("Error querying canScript", e);
if (!oldPage &&
/Receiving end does not exist/.test(e.message)) {
// probably startup and bg page not ready yet, hence no CSP: reload!
location.reload(false);
} else {
setTimeout(() => init(oldPage), 100);
}
return;
} finally {
queryingCanScript = false;
}
if (!canScript) onScriptDisabled();
seen.record({
request: {
key: "noscript-probe",
url: document.URL,
documentUrl: document.URL,
type: window === window.top ? "main_frame" : "script",
},
allowed: canScript
}
);
debug(`Loading NoScript in document %s, scripting=%s, readyState %s`,
document.URL, canScript, document.readyState);
if (/application|video|audio/.test(document.contentType)) {
debug("Embedding document detected");
embeddingDocument = true;
window.addEventListener("pageshow", e => {
debug("Active content still in document %s: %o", document.url, document.querySelectorAll("embed,object,video,audio"));
}, true);
// document.write("<plaintext>");
}
notifyPage() || addEventListener("pageshow", notifyPage);
};
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