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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
import { XPCOMUtils } from "resource://gre/modules/XPCOMUtils.sys.mjs";
const lazy = {};
ChromeUtils.defineESModuleGetters(lazy, {
PageDataSchema: "resource:///modules/pagedata/PageDataSchema.sys.mjs",
PrivateBrowsingUtils: "resource://gre/modules/PrivateBrowsingUtils.sys.mjs",
});
// We defer any attempt to check for page data for a short time after a page
// loads to allow JS to operate.
XPCOMUtils.defineLazyPreferenceGetter(
lazy,
"READY_DELAY",
"browser.pagedata.readyDelay",
500
);
/**
* The actor responsible for monitoring a page for page data.
*/
export class PageDataChild extends JSWindowActorChild {
#isContentWindowPrivate = true;
/**
* Used to debounce notifications about a page being ready.
*
* @type {Timer | null}
*/
#deferTimer = null;
/**
* Called when the actor is created for a new page.
*/
actorCreated() {
this.#isContentWindowPrivate = lazy.PrivateBrowsingUtils.isContentWindowPrivate(
this.contentWindow
);
}
/**
* Called when the page is destroyed.
*/
didDestroy() {
if (this.#deferTimer) {
this.#deferTimer.cancel();
}
}
/**
* Called when the page has signalled it is done loading. This signal is
* debounced by READY_DELAY.
*/
#deferReady() {
if (!this.#deferTimer) {
this.#deferTimer = Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
}
// If the timer was already running this re-starts it.
this.#deferTimer.initWithCallback(
() => {
this.#deferTimer = null;
this.sendAsyncMessage("PageData:DocumentReady", {
url: this.document.documentURI,
});
},
lazy.READY_DELAY,
Ci.nsITimer.TYPE_ONE_SHOT_LOW_PRIORITY
);
}
/**
* Called when a message is received from the parent process.
*
* @param {ReceiveMessageArgument} msg
* The received message.
*
* @returns {Promise | undefined}
* A promise for the requested data or undefined if no data was requested.
*/
receiveMessage(msg) {
if (this.#isContentWindowPrivate) {
return undefined;
}
switch (msg.name) {
case "PageData:CheckLoaded":
// The service just started in the parent. Check if this document is
// already loaded.
if (this.document.readystate == "complete") {
this.#deferReady();
}
break;
case "PageData:Collect":
return lazy.PageDataSchema.collectPageData(this.document);
}
return undefined;
}
/**
* DOM event handler.
*
* @param {Event} event
* The DOM event.
*/
handleEvent(event) {
if (this.#isContentWindowPrivate) {
return;
}
switch (event.type) {
case "DOMContentLoaded":
case "pageshow":
this.#deferReady();
break;
}
}
}
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