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