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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/. */
"use strict";
const { Cc, Ci, Cu } = require("chrome");
const IOService = Cc["@mozilla.org/network/io-service;1"].
getService(Ci.nsIIOService);
const AppShellService = Cc["@mozilla.org/appshell/appShellService;1"].
getService(Ci.nsIAppShellService);
const { NetUtil } = Cu.import("resource://gre/modules/NetUtil.jsm");
const FaviconService = Cc["@mozilla.org/browser/favicon-service;1"].
getService(Ci.nsIFaviconService);
const PNG_B64 = "data:image/png;base64,";
const DEF_FAVICON_URI = "chrome://mozapps/skin/places/defaultFavicon.png";
let DEF_FAVICON = null;
/**
* Takes URI of the page and returns associated favicon URI.
* If page under passed uri has no favicon then base64 encoded data URI of
* default faveicon is returned.
* @param {String} uri
* @returns {String}
*/
exports.getFaviconURIForLocation = function getFaviconURIForLocation(uri) {
let pageURI = NetUtil.newURI(uri);
try {
return FaviconService.getFaviconDataAsDataURL(
FaviconService.getFaviconForPage(pageURI));
}
catch(e) {
if (!DEF_FAVICON) {
DEF_FAVICON = PNG_B64 +
base64Encode(getChromeURIContent(DEF_FAVICON_URI));
}
return DEF_FAVICON;
}
}
/**
* Takes chrome URI and returns content under that URI.
* @param {String} chromeURI
* @returns {String}
*/
function getChromeURIContent(chromeURI) {
let channel = IOService.newChannel(chromeURI, null, null);
let input = channel.open();
let stream = Cc["@mozilla.org/binaryinputstream;1"].
createInstance(Ci.nsIBinaryInputStream);
stream.setInputStream(input);
let content = stream.readBytes(input.available());
stream.close();
input.close();
return content;
}
exports.getChromeURIContent = getChromeURIContent;
/**
* Creates a base-64 encoded ASCII string from a string of binary data.
*/
function base64Encode(data) AppShellService.hiddenDOMWindow.btoa(String(data));
exports.base64Encode = base64Encode;
/**
* Decodes a string of data which has been encoded using base-64 encoding.
*/
function base64Decode(data) AppShellService.hiddenDOMWindow.atob(String(data));
exports.base64Decode = base64Decode;
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