forked from mirrors/gecko-dev
134 lines
4.1 KiB
JavaScript
134 lines
4.1 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/XPCOMUtils.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "ManifestObtainer",
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"resource://gre/modules/ManifestObtainer.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "ManifestFinder",
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"resource://gre/modules/ManifestFinder.jsm");
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XPCOMUtils.defineLazyModuleGetter(this, "ManifestIcons",
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"resource://gre/modules/ManifestIcons.jsm");
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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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addMessageListener(
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"DOM:Manifest:FireAppInstalledEvent",
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this.fireAppInstalledEvent.bind(this)
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);
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addMessageListener(
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"DOM:WebManifest:fetchIcon",
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this.fetchIcon.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, which is destructured to just
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* get the id.
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*/
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hasManifestLink({data: {id}}) {
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const response = makeMsgResponse(id);
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response.result = ManifestFinder.contentHasManifestLink(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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* Asynchronously obtains a web manifest from content by using the
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* ManifestObtainer and messages back the result.
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* @param {Object} aMsg The IPC message, which is destructured to just
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* get the id.
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*/
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async obtainManifest({data: {id}}) {
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const response = makeMsgResponse(id);
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try {
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response.result = await ManifestObtainer.contentObtainManifest(content);
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response.success = true;
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} catch (err) {
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response.result = serializeError(err);
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}
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sendAsyncMessage("DOM:ManifestObtainer:Obtain", response);
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},
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fireAppInstalledEvent({data: {id}}){
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const ev = new Event("appinstalled");
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const response = makeMsgResponse(id);
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if (!content || content.top !== content) {
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const msg = "Can only dispatch install event on top-level browsing contexts.";
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response.result = serializeError(new Error(msg));
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} else {
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response.success = true;
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content.dispatchEvent(ev);
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}
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sendAsyncMessage("DOM:Manifest:FireAppInstalledEvent", response);
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},
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/**
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* Given a manifest and an expected icon size, ask ManifestIcons
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* to fetch the appropriate icon and send along result
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*/
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async fetchIcon({data: {id, manifest, iconSize}}) {
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const response = makeMsgResponse(id);
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try {
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response.result =
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await ManifestIcons.contentFetchIcon(content, manifest, iconSize);
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response.success = true;
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} catch (err) {
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response.result = serializeError(err);
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}
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sendAsyncMessage("DOM:WebManifest:fetchIcon", response);
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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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function 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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function 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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MessageHandler.registerListeners();
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