/* 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/.*/ /* * Manifest obtainer frame script implementation of: * http://www.w3.org/TR/appmanifest/#obtaining * * It searches a top-level browsing context for * a <link rel=manifest> element. Then fetches * and processes the linked manifest. * * BUG: https://bugzilla.mozilla.org/show_bug.cgi?id=1083410 */ /*globals Task, ManifestObtainer, ManifestFinder, content, sendAsyncMessage, addMessageListener, Components*/ "use strict"; const { utils: Cu, } = Components; Cu.import("resource://gre/modules/ManifestObtainer.jsm"); Cu.import("resource://gre/modules/ManifestFinder.jsm"); Cu.import("resource://gre/modules/Task.jsm"); const MessageHandler = { registerListeners() { addMessageListener( "DOM:WebManifest:hasManifestLink", this.hasManifestLink.bind(this) ); addMessageListener( "DOM:ManifestObtainer:Obtain", this.obtainManifest.bind(this) ); addMessageListener( "DOM:Manifest:FireAppInstalledEvent", this.fireAppInstalledEvent.bind(this) ); }, /** * Check if the content document includes a link to a web manifest. * @param {Object} aMsg The IPC message, which is destructured to just * get the id. */ hasManifestLink({data: {id}}) { const response = makeMsgResponse(id); response.result = ManifestFinder.contentHasManifestLink(content); response.success = true; sendAsyncMessage("DOM:WebManifest:hasManifestLink", response); }, /** * Asynchronously obtains a web manifest from content by using the * ManifestObtainer and messages back the result. * @param {Object} aMsg The IPC message, which is destructured to just * get the id. */ obtainManifest: Task.async(function* ({data: {id}}) { const response = makeMsgResponse(id); try { response.result = yield ManifestObtainer.contentObtainManifest(content); response.success = true; } catch (err) { response.result = serializeError(err); } sendAsyncMessage("DOM:ManifestObtainer:Obtain", response); }), fireAppInstalledEvent({data: {id}}){ const ev = new Event("appinstalled"); const response = makeMsgResponse(id); if (!content || content.top !== content) { const msg = "Can only dispatch install event on top-level browsing contexts."; response.result = serializeError(new Error(msg)); } else { response.success = true; content.dispatchEvent(ev); } sendAsyncMessage("DOM:Manifest:FireAppInstalledEvent", response); } }; /** * Utility function to Serializes an JS Error, so it can be transferred over * the message channel. * FIX ME: https://bugzilla.mozilla.org/show_bug.cgi?id=1172586 * @param {Error} aError The error to serialize. * @return {Object} The serialized object. */ function serializeError(aError) { const clone = { "fileName": aError.fileName, "lineNumber": aError.lineNumber, "columnNumber": aError.columnNumber, "stack": aError.stack, "message": aError.message, "name": aError.name }; return clone; } function makeMsgResponse(aId) { return { id: aId, success: false, result: undefined }; } MessageHandler.registerListeners();