Move Add-on SDK source to toolkit/jetpack

toolkit/jetpack/sdk/places/favicon.js

@@ -0,0 +1,49 @@
+/* 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";
+
+module.metadata = {
+  "stability": "unstable",
+  "engines": {
+    "Firefox": "*",
+    "SeaMonkey": "*"
+  }
+};
+
+const { Cc, Ci, Cu } = require("chrome");
+const { defer, reject } = require("../core/promise");
+const FaviconService = Cc["@mozilla.org/browser/favicon-service;1"].
+                          getService(Ci.nsIFaviconService);
+const AsyncFavicons = FaviconService.QueryInterface(Ci.mozIAsyncFavicons);
+const { isValidURI } = require("../url");
+const { newURI, getURL } = require("../url/utils");
+
+/**
+ * Takes an object of several possible types and
+ * returns a promise that resolves to the page's favicon URI.
+ * @param {String|Tab} object
+ * @param {Function} (callback)
+ * @returns {Promise}
+ */
+
+function getFavicon (object, callback) {
+  let url = getURL(object);
+  let deferred = defer();
+
+  if (url && isValidURI(url)) {
+    AsyncFavicons.getFaviconURLForPage(newURI(url), function (aURI) {
+      if (aURI && aURI.spec)
+        deferred.resolve(aURI.spec.toString());
+      else
+        deferred.reject(null);
+    });
+  } else {
+    deferred.reject(null);
+  }
+
+  if (callback) deferred.promise.then(callback, callback);
+  return deferred.promise;
+}
+exports.getFavicon = getFavicon;