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