gecko/toolkit/webapps/WebappsIconHelpers.js

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
const DEFAULT_ICON_URL = "chrome://global/skin/icons/webapps-64.png";
/**
* This function receives a list of icon sizes
* and URLs and returns the url string for the biggest icon.
*
* @param aIcons An object where the keys are the icon sizes
* and the values are URL strings. E.g.:
* aIcons = {
* "16": "http://www.example.org/icon16.png",
* "32": "http://www.example.org/icon32.png"
* };
*
* @returns the URL string for the largest specified icon
*/
function getBiggestIconURL(aIcons) {
if (!aIcons) {
return DEFAULT_ICON_URL;
}
let iconSizes = Object.keys(aIcons);
if (iconSizes.length == 0) {
return DEFAULT_ICON_URL;
}
iconSizes.sort(function(a, b) a - b);
return aIcons[iconSizes.pop()];
}
// Download an icon using either a temp file or a pipe.
function downloadIcon(aIconURI) {
let deferred = Promise.defer();
let mimeService = Cc["@mozilla.org/mime;1"].getService(Ci.nsIMIMEService);
let mimeType;
try {
let tIndex = aIconURI.path.indexOf(";");
if("data" == aIconURI.scheme && tIndex != -1) {
mimeType = aIconURI.path.substring(0, tIndex);
} else {
mimeType = mimeService.getTypeFromURI(aIconURI);
}
} catch(e) {
deferred.reject("Failed to determine icon MIME type: " + e);
return deferred.promise;
}
function onIconDownloaded(aStatusCode, aIcon) {
if (Components.isSuccessCode(aStatusCode)) {
deferred.resolve([ mimeType, aIcon ]);
} else {
deferred.reject("Failure downloading icon: " + aStatusCode);
}
}
try {
#ifdef XP_MACOSX
let downloadObserver = {
onDownloadComplete: function(downloader, request, cx, aStatus, file) {
onIconDownloaded(aStatus, file);
}
};
let tmpIcon = Services.dirsvc.get("TmpD", Ci.nsIFile);
tmpIcon.append("tmpicon." + mimeService.getPrimaryExtension(mimeType, ""));
tmpIcon.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, parseInt("666", 8));
let listener = Cc["@mozilla.org/network/downloader;1"]
.createInstance(Ci.nsIDownloader);
listener.init(downloadObserver, tmpIcon);
#else
let pipe = Cc["@mozilla.org/pipe;1"]
.createInstance(Ci.nsIPipe);
pipe.init(true, true, 0, 0xffffffff, null);
let listener = Cc["@mozilla.org/network/simple-stream-listener;1"]
.createInstance(Ci.nsISimpleStreamListener);
listener.init(pipe.outputStream, {
onStartRequest: function() {},
onStopRequest: function(aRequest, aContext, aStatusCode) {
pipe.outputStream.close();
onIconDownloaded(aStatusCode, pipe.inputStream);
}
});
#endif
let channel = NetUtil.newChannel(aIconURI);
let { BadCertHandler } = Cu.import("resource://gre/modules/CertUtils.jsm", {});
// Pass true to avoid optional redirect-cert-checking behavior.
channel.notificationCallbacks = new BadCertHandler(true);
channel.asyncOpen(listener, null);
} catch(e) {
deferred.reject("Failure initiating download of icon: " + e);
}
return deferred.promise;
}