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102 lines
3.3 KiB
JavaScript
102 lines
3.3 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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const DEFAULT_ICON_URL = "chrome://global/skin/icons/webapps-64.png";
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/**
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* This function receives a list of icon sizes
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* and URLs and returns the url string for the biggest icon.
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*
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* @param aIcons An object where the keys are the icon sizes
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* and the values are URL strings. E.g.:
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* aIcons = {
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* "16": "http://www.example.org/icon16.png",
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* "32": "http://www.example.org/icon32.png"
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* };
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*
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* @returns the URL string for the largest specified icon
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*/
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function getBiggestIconURL(aIcons) {
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if (!aIcons) {
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return DEFAULT_ICON_URL;
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}
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let iconSizes = Object.keys(aIcons);
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if (iconSizes.length == 0) {
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return DEFAULT_ICON_URL;
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}
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iconSizes.sort(function(a, b) a - b);
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return aIcons[iconSizes.pop()];
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}
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// Download an icon using either a temp file or a pipe.
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function downloadIcon(aIconURI) {
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let deferred = Promise.defer();
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let mimeService = Cc["@mozilla.org/mime;1"].getService(Ci.nsIMIMEService);
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let mimeType;
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try {
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let tIndex = aIconURI.path.indexOf(";");
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if("data" == aIconURI.scheme && tIndex != -1) {
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mimeType = aIconURI.path.substring(0, tIndex);
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} else {
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mimeType = mimeService.getTypeFromURI(aIconURI);
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}
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} catch(e) {
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deferred.reject("Failed to determine icon MIME type: " + e);
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return deferred.promise;
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}
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function onIconDownloaded(aStatusCode, aIcon) {
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if (Components.isSuccessCode(aStatusCode)) {
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deferred.resolve([ mimeType, aIcon ]);
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} else {
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deferred.reject("Failure downloading icon: " + aStatusCode);
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}
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}
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try {
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#ifdef XP_MACOSX
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let downloadObserver = {
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onDownloadComplete: function(downloader, request, cx, aStatus, file) {
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onIconDownloaded(aStatus, file);
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}
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};
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let tmpIcon = Services.dirsvc.get("TmpD", Ci.nsIFile);
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tmpIcon.append("tmpicon." + mimeService.getPrimaryExtension(mimeType, ""));
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tmpIcon.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, parseInt("666", 8));
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let listener = Cc["@mozilla.org/network/downloader;1"]
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.createInstance(Ci.nsIDownloader);
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listener.init(downloadObserver, tmpIcon);
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#else
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let pipe = Cc["@mozilla.org/pipe;1"]
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.createInstance(Ci.nsIPipe);
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pipe.init(true, true, 0, 0xffffffff, null);
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let listener = Cc["@mozilla.org/network/simple-stream-listener;1"]
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.createInstance(Ci.nsISimpleStreamListener);
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listener.init(pipe.outputStream, {
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onStartRequest: function() {},
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onStopRequest: function(aRequest, aContext, aStatusCode) {
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pipe.outputStream.close();
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onIconDownloaded(aStatusCode, pipe.inputStream);
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}
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});
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#endif
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let channel = NetUtil.newChannel(aIconURI);
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let { BadCertHandler } = Cu.import("resource://gre/modules/CertUtils.jsm", {});
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// Pass true to avoid optional redirect-cert-checking behavior.
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channel.notificationCallbacks = new BadCertHandler(true);
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channel.asyncOpen(listener, null);
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} catch(e) {
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deferred.reject("Failure initiating download of icon: " + e);
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}
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return deferred.promise;
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}
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