зеркало из https://github.com/mozilla/gecko-dev.git
101 строка
3.5 KiB
JavaScript
101 строка
3.5 KiB
JavaScript
/* vim: set ts=2 sw=2 sts=2 et tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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var EXPORTED_SYMBOLS = ["BackgroundThumbnailsChild"];
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const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
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ChromeUtils.defineModuleGetter(
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this,
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"PageThumbUtils",
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"resource://gre/modules/PageThumbUtils.jsm"
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);
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// NOTE: Copied from nsSandboxFlags.h
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/**
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* This flag prevents content from creating new auxiliary browsing contexts,
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* e.g. using the target attribute, or the window.open() method.
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*/
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const SANDBOXED_AUXILIARY_NAVIGATION = 0x2;
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class BackgroundThumbnailsChild extends JSWindowActorChild {
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receiveMessage(message) {
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switch (message.name) {
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case "Browser:Thumbnail:ContentInfo": {
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if (
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message.data.isImage ||
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this.contentWindow.ImageDocument.isInstance(this.document)
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) {
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// To avoid sending additional messages between processes, we return
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// the image data directly with the size info.
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return PageThumbUtils.createImageThumbnailCanvas(
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this.contentWindow,
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this.document.location,
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message.data.targetWidth,
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message.data.backgroundColor
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);
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}
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let [width, height] = PageThumbUtils.getContentSize(this.contentWindow);
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return { width, height };
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}
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case "Browser:Thumbnail:LoadURL": {
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let docShell = this.docShell.QueryInterface(Ci.nsIWebNavigation);
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// We want a low network priority for this service - lower than b/g tabs
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// etc - so set it to the lowest priority available.
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docShell
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.QueryInterface(Ci.nsIDocumentLoader)
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.loadGroup.QueryInterface(Ci.nsISupportsPriority).priority =
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Ci.nsISupportsPriority.PRIORITY_LOWEST;
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docShell.allowMedia = false;
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docShell.allowPlugins = false;
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docShell.allowContentRetargeting = false;
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let defaultFlags =
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Ci.nsIRequest.LOAD_ANONYMOUS |
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Ci.nsIRequest.LOAD_BYPASS_CACHE |
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Ci.nsIRequest.INHIBIT_CACHING |
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Ci.nsIWebNavigation.LOAD_FLAGS_BYPASS_HISTORY;
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docShell.defaultLoadFlags = defaultFlags;
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this.browsingContext.sandboxFlags |= SANDBOXED_AUXILIARY_NAVIGATION;
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docShell.useTrackingProtection = true;
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// Get the document to force a content viewer to be created, otherwise
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// the first load can fail.
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if (!this.document) {
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return false;
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}
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let loadURIOptions = {
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// Bug 1498603 verify usages of systemPrincipal here
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triggeringPrincipal: Services.scriptSecurityManager.getSystemPrincipal(),
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loadFlags: Ci.nsIWebNavigation.LOAD_FLAGS_STOP_CONTENT,
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};
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try {
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docShell.loadURI(message.data.url, loadURIOptions);
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} catch (ex) {
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return false;
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}
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return true;
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}
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}
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return undefined;
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}
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handleEvent(event) {
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if (event.type == "DOMDocElementInserted") {
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// Arrange to prevent (most) popup dialogs for this window - popups done
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// in the parent (eg, auth) aren't prevented, but alert() etc are.
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// disableDialogs only works on the current inner window, so it has
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// to be called every page load, but before scripts run.
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this.contentWindow.windowUtils.disableDialogs();
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}
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}
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}
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