зеркало из https://github.com/mozilla/gecko-dev.git
93 строки
2.7 KiB
JavaScript
93 строки
2.7 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 http://mozilla.org/MPL/2.0/.*/
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/*
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* Manifest obtainer frame script implementation of:
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* http://www.w3.org/TR/appmanifest/#obtaining
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*
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* It searches a top-level browsing context for
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* a <link rel=manifest> element. Then fetches
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* and processes the linked manifest.
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*
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* BUG: https://bugzilla.mozilla.org/show_bug.cgi?id=1083410
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*/
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/*globals Task, ManifestObtainer, ManifestFinder, content, sendAsyncMessage, addMessageListener, Components*/
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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/ManifestObtainer.jsm');
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Cu.import('resource://gre/modules/ManifestFinder.jsm');
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Cu.import('resource://gre/modules/Task.jsm');
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const finder = new ManifestFinder();
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const MessageHandler = {
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registerListeners() {
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addMessageListener(
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'DOM:WebManifest:hasManifestLink',
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this.hasManifestLink.bind(this)
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);
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addMessageListener(
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'DOM:ManifestObtainer:Obtain',
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this.obtainManifest.bind(this)
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);
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},
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/**
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* Check if the content document includes a link to a web manifest.
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* @param {Object} aMsg The IPC message.
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*/
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hasManifestLink: Task.async(function* ({data: {id}}) {
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const response = this.makeMsgResponse(id);
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response.result = yield finder.hasManifestLink(content);
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response.success = true;
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sendAsyncMessage('DOM:WebManifest:hasManifestLink', response);
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}),
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/**
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* Obtains a web manifest from content by using the ManifestObtainer
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* and messages back the result.
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* @param {Object} aMsg The IPC message.
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*/
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obtainManifest: Task.async(function* ({data: {id}}) {
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const obtainer = new ManifestObtainer();
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const response = this.makeMsgResponse(id);
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try {
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response.result = yield obtainer.obtainManifest(content);
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response.success = true;
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} catch (err) {
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response.result = this.serializeError(err);
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}
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sendAsyncMessage('DOM:ManifestObtainer:Obtain', response);
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}),
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makeMsgResponse(aId) {
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return {
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id: aId,
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success: false,
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result: undefined
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};
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},
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/**
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* Utility function to Serializes an JS Error, so it can be transferred over
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* the message channel.
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* FIX ME: https://bugzilla.mozilla.org/show_bug.cgi?id=1172586
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* @param {Error} aError The error to serialize.
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* @return {Object} The serialized object.
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*/
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serializeError(aError) {
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const clone = {
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'fileName': aError.fileName,
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'lineNumber': aError.lineNumber,
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'columnNumber': aError.columnNumber,
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'stack': aError.stack,
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'message': aError.message,
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'name': aError.name
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};
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return clone;
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},
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};
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MessageHandler.registerListeners();
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