gecko/dom/settings/SettingsManager.js
2012-06-10 19:44:50 -04:00

345 lines
12 KiB
JavaScript

/* 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";
function debug(s) {
// dump("-*- SettingsManager: " + s + "\n");
}
const Cc = Components.classes;
const Ci = Components.interfaces;
const Cu = Components.utils;
Cu.import("resource://gre/modules/SettingsQueue.jsm");
Cu.import("resource://gre/modules/SettingsDB.jsm");
Cu.import("resource://gre/modules/XPCOMUtils.jsm");
Cu.import("resource://gre/modules/Services.jsm");
XPCOMUtils.defineLazyGetter(this, "cpmm", function() {
return Cc["@mozilla.org/childprocessmessagemanager;1"].getService(Ci.nsIFrameMessageManager);
});
const nsIClassInfo = Ci.nsIClassInfo;
const SETTINGSLOCK_CONTRACTID = "@mozilla.org/settingsLock;1";
const SETTINGSLOCK_CID = Components.ID("{ef95ddd0-6308-11e1-b86c-0800200c9a66}");
const nsIDOMSettingsLock = Ci.nsIDOMSettingsLock;
function SettingsLock(aSettingsManager)
{
this._open = true;
this._requests = new Queue();
this._settingsManager = aSettingsManager;
this._transaction = null;
}
SettingsLock.prototype = {
process: function process() {
let lock = this;
lock._open = false;
let store = lock._transaction.objectStore(SETTINGSSTORE_NAME);
while (!lock._requests.isEmpty()) {
let info = lock._requests.dequeue();
debug("info: " + info.intent);
let request = info.request;
switch (info.intent) {
case "clear":
let req = store.clear();
req.onsuccess = function() { this._open = true;
Services.DOMRequest.fireSuccess(request, 0);
this._open = false; }.bind(lock);
req.onerror = function() { Services.DOMRequest.fireError(request, 0) };
break;
case "set":
for (let key in info.settings) {
debug("key: " + key + ", val: " + JSON.stringify(info.settings[key]) + ", type: " + typeof(info.settings[key]));
if(typeof(info.settings[key]) != 'object') {
req = store.put({settingName: key, settingValue: info.settings[key]});
} else {
//Workaround for cloning issues
let obj = JSON.parse(JSON.stringify(info.settings[key]));
req = store.put({settingName: key, settingValue: obj});
}
req.onsuccess = function() {
lock._open = true;
Services.DOMRequest.fireSuccess(request, 0);
cpmm.sendAsyncMessage("Settings:Changed", { key: key, value: info.settings[key] });
lock._open = false;
};
req.onerror = function() { Services.DOMRequest.fireError(request, 0) };
}
break;
case "get":
req = (info.name === "*") ? store.getAll()
: store.getAll(info.name);
req.onsuccess = function(event) {
debug("Request for '" + info.name + "' successful. " +
"Record count: " + event.target.result.length);
debug("result: " + JSON.stringify(event.target.result));
let results = {
__exposedProps__: {
}
};
for (var i in event.target.result) {
let result = event.target.result[i];
results[result.settingName] = result.settingValue;
results.__exposedProps__[result.settingName] = "r";
}
this._open = true;
Services.DOMRequest.fireSuccess(request, results);
this._open = false;
}.bind(lock);
req.onerror = function() {
Services.DOMRequest.fireError(request, 0)
};
break;
}
}
if (!lock._requests.isEmpty())
throw Components.results.NS_ERROR_ABORT;
lock._open = true;
},
createTransactionAndProcess: function() {
if (this._settingsManager._settingsDB._db) {
var lock;
while (lock = this._settingsManager._locks.dequeue()) {
if (!lock._transaction) {
lock._transaction = lock._settingsManager._settingsDB._db.transaction(SETTINGSSTORE_NAME, "readwrite");
}
lock.process();
}
if (!this._requests.isEmpty())
this.process();
}
},
get: function get(aName) {
if (!this._open) {
dump("Settings lock not open!\n");
throw Components.results.NS_ERROR_ABORT;
}
if (this._settingsManager.hasReadPrivileges || this._settingsManager.hasReadWritePrivileges) {
let req = Services.DOMRequest.createRequest(this._settingsManager._window);
this._requests.enqueue({ request: req, intent:"get", name: aName });
this.createTransactionAndProcess();
return req;
} else {
debug("get not allowed");
throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
}
},
set: function set(aSettings) {
if (!this._open) {
dump("Settings lock not open!\n");
throw Components.results.NS_ERROR_ABORT;
}
if (this._settingsManager.hasReadWritePrivileges) {
let req = Services.DOMRequest.createRequest(this._settingsManager._window);
debug("send: " + JSON.stringify(aSettings));
this._requests.enqueue({request: req, intent: "set", settings: aSettings});
this.createTransactionAndProcess();
return req;
} else {
debug("set not allowed");
throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
}
},
clear: function clear() {
if (!this._open) {
dump("Settings lock not open!\n");
throw Components.results.NS_ERROR_ABORT;
}
if (this._settingsManager.hasReadWritePrivileges) {
let req = Services.DOMRequest.createRequest(this._settingsManager._window);
this._requests.enqueue({ request: req, intent: "clear"});
this.createTransactionAndProcess();
return req;
} else {
debug("clear not allowed");
throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
}
},
classID : SETTINGSLOCK_CID,
QueryInterface : XPCOMUtils.generateQI([nsIDOMSettingsLock]),
classInfo : XPCOMUtils.generateCI({classID: SETTINGSLOCK_CID,
contractID: SETTINGSLOCK_CONTRACTID,
classDescription: "SettingsLock",
interfaces: [nsIDOMSettingsLock],
flags: nsIClassInfo.DOM_OBJECT})
};
const SETTINGSMANAGER_CONTRACTID = "@mozilla.org/settingsManager;1";
const SETTINGSMANAGER_CID = Components.ID("{dd9f5380-a454-11e1-b3dd-0800200c9a66}");
const nsIDOMSettingsManager = Ci.nsIDOMSettingsManager;
let myGlobal = this;
function SettingsManager()
{
this._locks = new Queue();
var idbManager = Components.classes["@mozilla.org/dom/indexeddb/manager;1"].getService(Ci.nsIIndexedDatabaseManager);
idbManager.initWindowless(myGlobal);
this._settingsDB = new SettingsDB();
this._settingsDB.init(myGlobal);
}
SettingsManager.prototype = {
_onsettingchange: null,
_callbacks: null,
nextTick: function nextTick(aCallback, thisObj) {
if (thisObj)
aCallback = aCallback.bind(thisObj);
Services.tm.currentThread.dispatch(aCallback, Ci.nsIThread.DISPATCH_NORMAL);
},
set onsettingchange(aCallback) {
if (this.hasReadPrivileges || this.hasReadWritePrivileges)
this._onsettingchange = aCallback;
else
throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
},
get onsettingchange() {
return this._onsettingchange;
},
getLock: function() {
debug("get lock!");
var lock = new SettingsLock(this);
this._locks.enqueue(lock);
this._settingsDB.ensureDB(
function() { lock.createTransactionAndProcess(); },
function() { dump("ensureDB error cb!\n"); },
myGlobal );
this.nextTick(function() { this._open = false; }, lock);
return lock;
},
receiveMessage: function(aMessage) {
debug("Settings::receiveMessage: " + aMessage.name);
let msg = aMessage.json;
switch (aMessage.name) {
case "Settings:Change:Return:OK":
debug("Settings:Change:Return:OK");
if (this._onsettingchange || this._callbacks) {
debug('data:' + msg.key + ':' + msg.value + '\n');
if (this._onsettingchange) {
let event = new this._window.MozSettingsEvent("settingchanged", {
settingName: msg.key,
settingValue: msg.value
});
this._onsettingchange.handleEvent(event);
}
if (this._callbacks && this._callbacks[msg.key]) {
debug("observe callback called! " + msg.key + " " + this._callbacks[msg.key].length);
for (let cb in this._callbacks[msg.key]) {
this._callbacks[msg.key].forEach(function(cb) {
cb({settingName: msg.key, settingValue: msg.value});
});
}
}
} else {
debug("no observers stored!");
}
break;
default:
debug("Wrong message: " + aMessage.name);
}
},
addObserver: function addObserver(aName, aCallback) {
debug("addObserver " + aName);
if (!this._callbacks)
this._callbacks = {};
if (!this._callbacks[aName]) {
this._callbacks[aName] = [aCallback];
} else {
this._callbacks[aName].push(aCallback);
}
},
removeObserver: function removeObserver(aName, aCallback) {
debug("deleteObserver " + aName);
if (this._callbacks && this._callbacks[aName]) {
let index = this._callbacks[aName].indexOf(aCallback)
if (index != -1) {
this._callbacks[aName].splice(index, 1)
} else {
debug("Callback not found for: " + aName);
}
} else {
debug("No observers stored for " + aName);
}
},
init: function(aWindow) {
// Set navigator.mozSettings to null.
if (!Services.prefs.getBoolPref("dom.mozSettings.enabled"))
return null;
cpmm.addMessageListener("Settings:Change:Return:OK", this);
this._window = aWindow;
Services.obs.addObserver(this, "inner-window-destroyed", false);
let util = aWindow.QueryInterface(Ci.nsIInterfaceRequestor).getInterface(Ci.nsIDOMWindowUtils);
this.innerWindowID = util.currentInnerWindowID;
let principal = aWindow.document.nodePrincipal;
let secMan = Cc["@mozilla.org/scriptsecuritymanager;1"].getService(Ci.nsIScriptSecurityManager);
let readPerm = principal == secMan.getSystemPrincipal() ? Ci.nsIPermissionManager.ALLOW_ACTION : Services.perms.testExactPermission(principal.URI, "websettings-read");
let readwritePerm = principal == secMan.getSystemPrincipal() ? Ci.nsIPermissionManager.ALLOW_ACTION : Services.perms.testExactPermission(principal.URI, "websettings-readwrite");
this.hasReadPrivileges = readPerm == Ci.nsIPermissionManager.ALLOW_ACTION;
this.hasReadWritePrivileges = readwritePerm == Ci.nsIPermissionManager.ALLOW_ACTION;
debug("has read privileges :" + this.hasReadPrivileges + ", has read-write privileges: " + this.hasReadWritePrivileges);
},
observe: function(aSubject, aTopic, aData) {
debug("Topic: " + aTopic);
if (aTopic == "inner-window-destroyed") {
let wId = aSubject.QueryInterface(Ci.nsISupportsPRUint64).data;
if (wId == this.innerWindowID) {
Services.obs.removeObserver(this, "inner-window-destroyed");
cpmm.removeMessageListener("Settings:Change:Return:OK", this);
this._requests = null;
this._window = null;
this._innerWindowID = null;
this._onsettingchange = null;
this._settingsDB.close();
}
}
},
classID : SETTINGSMANAGER_CID,
QueryInterface : XPCOMUtils.generateQI([nsIDOMSettingsManager, Ci.nsIDOMGlobalPropertyInitializer]),
classInfo : XPCOMUtils.generateCI({classID: SETTINGSMANAGER_CID,
contractID: SETTINGSMANAGER_CONTRACTID,
classDescription: "SettingsManager",
interfaces: [nsIDOMSettingsManager],
flags: nsIClassInfo.DOM_OBJECT})
}
const NSGetFactory = XPCOMUtils.generateNSGetFactory([SettingsManager, SettingsLock])