зеркало из https://github.com/mozilla/gecko-dev.git
113 строки
3.1 KiB
JavaScript
113 строки
3.1 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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const lazy = {};
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ChromeUtils.defineESModuleGetters(lazy, {
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ManifestFinder: "resource://gre/modules/ManifestFinder.sys.mjs",
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ManifestIcons: "resource://gre/modules/ManifestIcons.sys.mjs",
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ManifestObtainer: "resource://gre/modules/ManifestObtainer.sys.mjs",
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});
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export class ManifestMessagesChild extends JSWindowActorChild {
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receiveMessage(message) {
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switch (message.name) {
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case "DOM:WebManifest:hasManifestLink":
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return this.hasManifestLink();
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case "DOM:ManifestObtainer:Obtain":
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return this.obtainManifest(message.data);
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case "DOM:WebManifest:fetchIcon":
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return this.fetchIcon(message);
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}
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return undefined;
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}
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/**
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* Check if the document includes a link to a web manifest.
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*/
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hasManifestLink() {
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const response = makeMsgResponse();
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response.result = lazy.ManifestFinder.contentHasManifestLink(
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this.contentWindow
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);
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response.success = true;
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return response;
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}
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/**
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* Asynchronously obtains a web manifest from this window by using the
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* ManifestObtainer and returns the result.
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* @param {Object} checkConformance True if spec conformance messages should be collected.
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*/
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async obtainManifest(options) {
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const { checkConformance } = options;
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const response = makeMsgResponse();
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try {
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response.result = await lazy.ManifestObtainer.contentObtainManifest(
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this.contentWindow,
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{ checkConformance }
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);
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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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return 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: { manifest, iconSize } }) {
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const response = makeMsgResponse();
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try {
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response.result = await lazy.ManifestIcons.contentFetchIcon(
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this.contentWindow,
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manifest,
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iconSize
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);
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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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return 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() {
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return {
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success: false,
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result: undefined,
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};
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}
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