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111 lines
3.4 KiB
JavaScript
111 lines
3.4 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://w3c.github.io/manifest/#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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* exported ManifestObtainer
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*/
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/*globals content, ManifestProcessor, XPCOMUtils, 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, 'ManifestProcessor',
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'resource://gre/modules/ManifestProcessor.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, 'BrowserUtils',
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'resource://gre/modules/BrowserUtils.jsm');
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addMessageListener('DOM:ManifestObtainer:Obtain', (aMsg) => {
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fetchManifest()
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.then(
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manifest => sendAsyncMessage('DOM:ManifestObtainer:Obtain', {
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success: true,
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result: manifest,
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msgId: aMsg.data.msgId
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}),
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error => sendAsyncMessage('DOM:ManifestObtainer:Obtain', {
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success: false,
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result: cloneError(error),
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msgId: aMsg.data.msgId
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})
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);
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});
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function cloneError(aError) {
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const clone = {
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'fileName': String(aError.fileName),
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'lineNumber': String(aError.lineNumber),
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'columnNumber': String(aError.columnNumber),
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'stack': String(aError.stack),
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'message': String(aError.message),
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'name': String(aError.name)
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};
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return clone;
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}
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function fetchManifest() {
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const manifestQuery = 'link[rel~="manifest"]';
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return new Promise((resolve, reject) => {
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if (!content || content.top !== content) {
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let msg = 'Content window must be a top-level browsing context.';
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return reject(new Error(msg));
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}
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const elem = content.document.querySelector(manifestQuery);
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if (!elem || !elem.getAttribute('href')) {
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let msg = 'No manifest to fetch.';
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return reject(new Error(msg));
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}
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// Will throw on "about:blank" and possibly other invalid URIs.
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const manifestURL = new content.URL(elem.href, elem.baseURI);
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const reqInit = {
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mode: 'cors'
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};
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if (elem.crossOrigin === 'use-credentials') {
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reqInit.credentials = 'include';
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}
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const req = new content.Request(manifestURL, reqInit);
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req.setContext('manifest');
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content
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.fetch(req)
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.then(resp => processResponse(resp, content))
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.then(resolve)
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.catch(reject);
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});
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}
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function processResponse(aResp, aContentWindow) {
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const manifestURL = aResp.url;
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return new Promise((resolve, reject) => {
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const badStatus = aResp.status < 200 || aResp.status >= 300;
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if (aResp.type === 'error' || badStatus) {
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let msg =
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`Fetch error: ${aResp.status} - ${aResp.statusText} at ${aResp.url}`;
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return reject(new Error(msg));
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}
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aResp
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.text()
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.then((text) => {
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const args = {
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jsonText: text,
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manifestURL: manifestURL,
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docURL: aContentWindow.location.href
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};
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const processor = new ManifestProcessor();
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const manifest = processor.process(args);
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resolve(Cu.cloneInto(manifest, content));
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}, reject);
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});
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}
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