зеркало из https://github.com/mozilla/gecko-dev.git
66 строки
2.0 KiB
JavaScript
66 строки
2.0 KiB
JavaScript
/* 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 https://mozilla.org/MPL/2.0/. */
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/* globals Components, Task, PromiseMessage */
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"use strict";
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const {
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utils: Cu
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} = Components;
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Cu.import("resource://gre/modules/PromiseMessage.jsm");
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this.ManifestFinder = {// jshint ignore:line
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/**
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* Check from content process if DOM Window has a conforming
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* manifest link relationship.
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* @param aContent DOM Window to check.
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* @return {Promise<Boolean>}
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*/
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contentHasManifestLink(aContent) {
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if (!aContent || isXULBrowser(aContent)) {
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throw new TypeError("Invalid input.");
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}
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return checkForManifest(aContent);
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},
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/**
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* Check from a XUL browser (parent process) if it's content document has a
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* manifest link relationship.
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* @param aBrowser The XUL browser to check.
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* @return {Promise}
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*/
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async browserHasManifestLink(aBrowser) {
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if (!isXULBrowser(aBrowser)) {
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throw new TypeError("Invalid input.");
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}
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const msgKey = "DOM:WebManifest:hasManifestLink";
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const mm = aBrowser.messageManager;
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const reply = await PromiseMessage.send(mm, msgKey);
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return reply.data.result;
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}
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};
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function isXULBrowser(aBrowser) {
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if (!aBrowser || !aBrowser.namespaceURI || !aBrowser.localName) {
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return false;
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}
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const XUL = "http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";
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return (aBrowser.namespaceURI === XUL && aBrowser.localName === "browser");
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}
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function checkForManifest(aWindow) {
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// Only top-level browsing contexts are valid.
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if (!aWindow || aWindow.top !== aWindow) {
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return false;
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}
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const elem = aWindow.document.querySelector("link[rel~='manifest']");
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// Only if we have an element and a non-empty href attribute.
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if (!elem || !elem.getAttribute("href")) {
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return false;
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}
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return true;
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}
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this.EXPORTED_SYMBOLS = [// jshint ignore:line
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"ManifestFinder"
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];
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