зеркало из https://github.com/mozilla/gecko-dev.git
80 строки
2.9 KiB
JavaScript
80 строки
2.9 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 EXPORTED_SYMBOLS = ["WebappRT"];
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const Cc = Components.classes;
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const Ci = Components.interfaces;
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const Cu = Components.utils;
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Cu.import("resource://gre/modules/XPCOMUtils.jsm");
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Cu.import("resource://gre/modules/Services.jsm");
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XPCOMUtils.defineLazyGetter(this, "FileUtils", function() {
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Cu.import("resource://gre/modules/FileUtils.jsm");
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return FileUtils;
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});
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XPCOMUtils.defineLazyGetter(this, "DOMApplicationRegistry", function() {
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Cu.import("resource://gre/modules/Webapps.jsm");
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return DOMApplicationRegistry;
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});
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// In test mode, observe webapps-ask-install so tests can install apps.
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Services.obs.addObserver(function observeCmdLine(subj, topic, data) {
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Services.obs.removeObserver(observeCmdLine, "webapprt-command-line");
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let args = subj.QueryInterface(Ci.nsIPropertyBag2);
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if (!args.hasKey("test-mode"))
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return;
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Services.obs.addObserver(function observeInstall(subj, topic, data) {
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// observeInstall is present for the lifetime of the runtime.
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let config = JSON.parse(data);
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config.registryDir = Services.dirsvc.get("ProfD", Ci.nsIFile).path;
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DOMApplicationRegistry.confirmInstall(config);
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delete WebappRT.config;
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WebappRT.config = deepFreeze(config);
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Services.obs.notifyObservers(null, "webapprt-test-did-install",
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JSON.stringify(config));
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}, "webapps-ask-install", false);
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}, "webapprt-command-line", false);
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let WebappRT = {
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get config() {
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let webappFile = FileUtils.getFile("AppRegD", ["webapp.json"]);
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let inputStream = Cc["@mozilla.org/network/file-input-stream;1"].
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createInstance(Ci.nsIFileInputStream);
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inputStream.init(webappFile, -1, 0, 0);
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let json = Cc["@mozilla.org/dom/json;1"].createInstance(Ci.nsIJSON);
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let config = json.decodeFromStream(inputStream, webappFile.fileSize);
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// Memoize the getter, freezing the `config` object in the meantime so
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// consumers don't inadvertently (or intentionally) change it, as the object
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// is meant to be a read-only representation of the webapp's configuration.
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config = deepFreeze(config);
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delete this.config;
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Object.defineProperty(this, "config", { get: function getConfig() config });
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return this.config;
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}
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};
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function deepFreeze(o) {
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// First, freeze the object.
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Object.freeze(o);
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// Then recursively call deepFreeze() to freeze its properties.
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for (let p in o) {
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// If the object is on the prototype, not an object, or is already frozen,
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// skip it. Note that this might leave an unfrozen reference somewhere in
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// the object if there is an already frozen object containing an unfrozen
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// object.
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if (!o.hasOwnProperty(p) || !(typeof o[p] == "object") ||
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Object.isFrozen(o[p]))
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continue;
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deepFreeze(o[p]);
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}
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return o;
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}
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