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songbird
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Songbird_0.4_windows-i686.exe
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components
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sbAddonMetadata.js
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2007-12-21
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/**
//
// BEGIN SONGBIRD GPL
//
// This file is part of the Songbird web player.
//
// Copyright(c) 2005-2008 POTI, Inc.
// http://songbirdnest.com
//
// This file may be licensed under the terms of of the
// GNU General Public License Version 2 (the "GPL").
//
// Software distributed under the License is distributed
// on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either
// express or implied. See the GPL for the specific language
// governing rights and limitations.
//
// You should have received a copy of the GPL along with this
// program. If not, go to http://www.gnu.org/licenses/gpl.html
// or write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// END SONGBIRD GPL
//
*/
/**
* \file sbAddonMetadata.js
* \brief Provides an nsIRDFDataSource with the contents of all
* addon install.rdf files.
*/
const CONTRACTID = "@mozilla.org/rdf/datasource;1?name=addon-metadata";
const CLASSNAME = "Songbird Addon Metadata Datasource";
const CID = Components.ID("{a1edd551-0f29-4ce9-aebc-92fbee77f37e}");
const IID = Components.interfaces.nsIRDFDataSource;
const FILE_INSTALL_MANIFEST = "install.rdf";
const FILE_EXTENSIONS = "extensions.rdf";
const FILE_ADDONMETADATA = "addon-metadata.rdf";
const PREF_LASTMODIFIED = "songbird.addonmetadata.lastModifiedTime";
const KEY_PROFILEDIR = "ProfD";
const RDFURI_INSTALL_MANIFEST_ROOT = "urn:mozilla:install-manifest";
const RDFURI_ADDON_ROOT = "urn:songbird:addon:root"
const PREFIX_ADDON_URI = "urn:songbird:addon:";
const PREFIX_NS_EM = "http://www.mozilla.org/2004/em-rdf#";
const PREFIX_NS_SONGBIRD = "http://www.songbirdnest.com/2007/addon-metadata-rdf#";
const PREFIX_ITEM_URI = "urn:mozilla:item:";
function SONGBIRD_NS(property) {
return PREFIX_NS_SONGBIRD + property;
}
function EM_NS(property) {
return PREFIX_NS_EM + property;
}
function ADDON_NS(id) {
return PREFIX_ADDON_URI + id;
}
function ITEM_NS(id) {
return PREFIX_ITEM_URI + id;
}
/**
* /class AddonMetadata
* /brief Provides an nsIRDFDataSource with the contents of all
* addon install.rdf files.
*/
function AddonMetadata() {
//debug("\nAddonMetadata: constructed\n");
this._RDF = Components.classes["@mozilla.org/rdf/rdf-service;1"]
.getService(Components.interfaces.nsIRDFService);
try {
// If possible, load the cached datasource from disk.
// Otherwise rebuild it by reading the metadata from all addons
if (!this._loadDatasource() || this._isRebuildRequired()) {
//debug("AddonMetadata: rebuilding addon metadata datasource\n");
this._purgeDatasource();
this._buildDatasource();
}
} catch (e) {
dump("AddonMetadata: Constructor Error: " + e.toString());
}
var os = Components.classes["@mozilla.org/observer-service;1"]
.getService(Components.interfaces.nsIObserverService);
os.addObserver(this, "xpcom-shutdown", false);
};
AddonMetadata.prototype = {
constructor: AddonMetadata,
_RDF: null,
_datasource: null,
/**
* Return true if cached addons metadata datasource is no longer valid.
* Uses the last modified date on the extension manager's data file to
* determine if extensions have changed.
*/
_isRebuildRequired: function _isRebuildRequired() {
var emDataFile = this._getProfileFile(FILE_EXTENSIONS);
if (!emDataFile.exists()) {
//debug("AddonMetadata._isRebuildRequired: " + FILE_EXTENSIONS + " not found\n");
return true;
}
var newLastModified = emDataFile.lastModifiedTime.toString();
// When was the last time we noticed that extensions.rdf had been modified
var prefs = Components.classes["@mozilla.org/preferences-service;1"]
.getService(Components.interfaces.nsIPrefBranch);
var lastModified = 0;
try {
lastModified = prefs.getCharPref(PREF_LASTMODIFIED);
} catch (e) {}
// If the extensions.rdf hasn't changed, then we don't need to rebuild
//debug("AddonMetadata._isRebuildRequired: " + lastModified + " == " + newLastModified + "\n");
if (lastModified == newLastModified) {
return false;
}
// Store the new last modified time
prefs.setCharPref(PREF_LASTMODIFIED, newLastModified);
//debug("AddonMetadata._isRebuildRequired: true\n");
// Extensions.rdf has changed, so we will need to rebuild the addons datasource.
return true;
},
/**
* Attempt to load the data source from disk. Return false
* if the datasource needs populating.
*/
_loadDatasource: function _loadDatasource() {
//debug("\nAddonMetadata: _loadDatasource \n");
var file = this._getProfileFile(FILE_ADDONMETADATA);
try {
this._datasource = this._getDatasource(file);
} catch (e) {
// Load did not go ok. Will need to rebuild
return false;
}
if (!file.exists()) {
return false;
}
return true;
},
/**
* Clean out the contents of the datasource
*/
_purgeDatasource: function _purgeDatasource() {
//debug("\nAddonMetadata: _purgeDatasource \n");
var file = this._getProfileFile(FILE_ADDONMETADATA);
// Make sure the RDF service isn't caching our ds
this._RDF.UnregisterDataSource(this._datasource);
// Kill the file
try {
if (file.exists()) {
file.remove(false);
}
} catch (e) {
debug("\nAddonMetadata: _purgeDatasource: Could not remove "
+ "addon-metadata.rdf. Bad things may happen.\n");
}
// Reload the datasource. Since the file no longer exists
// this will result in a new empty DS.
this._loadDatasource();
},
/**
* Given a filename, returns an nsIFile pointing to
* profile/filename
*/
_getProfileFile: function _getProfileFile(filename) {
// get profile directory
var file = Components.classes["@mozilla.org/file/directory_service;1"]
.getService(Components.interfaces.nsIProperties)
.get("ProfD", Components.interfaces.nsIFile);
var localFile = file.QueryInterface(Components.interfaces.nsILocalFile);
localFile.appendRelativePath(filename)
return file;
},
/**
* Populate the datasource with the contents of all
* addon install.rdf files.
*/
_buildDatasource: function _buildDatasource() {
//debug("\nAddonMetadata: _buildDatasource \n");
// Make a container to list all installed extensions
var itemRoot = this._RDF.GetResource(RDFURI_ADDON_ROOT);
var cu = Components.classes["@mozilla.org/rdf/container-utils;1"]
.getService(Components.interfaces.nsIRDFContainerUtils);
var container = cu.MakeSeq(this._datasource, itemRoot);
var extManager = Components.classes["@mozilla.org/extensions/manager;1"]
.getService(Components.interfaces.nsIExtensionManager);
// Read the install.rdf for every addon
var addons = extManager.getItemList(Components.interfaces.nsIUpdateItem.TYPE_ADDON, {});
for (var i = 0; i < addons.length; i++)
{
var id = addons[i].id;
// If the extension is disabled, do not include it in our datasource
if (this._isExtensionDisabled(id)) {
//debug("\nAddonMetadata: id {" + id + "} is disabled.\n");
continue;
}
//debug("\nAddonMetadata: loading install.rdf for id {" + id + "}\n");
var location = extManager.getInstallLocation(id);
var installManifestFile = location.getItemFile(id, FILE_INSTALL_MANIFEST);
if (!installManifestFile.exists()) {
this._reportErrors(["install.rdf for id " + id + " was not found " +
"at location " + installManifestFile.path]);
}
var manifestDS = this._getDatasource(installManifestFile);
var itemNode = this._RDF.GetResource(ADDON_NS(id));
// Copy the install.rdf metadata into the master datasource
this._copyManifest(itemNode, manifestDS);
// Add the new install.rdf root to the list of extensions
container.AppendElement(itemNode);
}
// Save changes
this._datasource.QueryInterface(Components.interfaces.nsIRDFRemoteDataSource)
.Flush();
//debug("\nAddonMetadata: _buildDatasource complete \n");
},
/**
* Return true if the given extension GUID has been disabled in the EM
*/
_isExtensionDisabled: function _isExtensionDisabled(id) {
var item = this._RDF.GetResource(ITEM_NS(id));
var extManager = Components.classes["@mozilla.org/extensions/manager;1"]
.getService(Components.interfaces.nsIExtensionManager);
var userDisabled = this._RDF.GetResource(EM_NS("userDisabled"));
if (extManager.datasource.hasArcOut(item, userDisabled)) {
var target = extManager.datasource.GetTarget(item, userDisabled, true);
if (target instanceof Components.interfaces.nsIRDFLiteral){
target = target.QueryInterface(Components.interfaces.nsIRDFLiteral);
return target.Value == "true";
}
}
var appDisabled = this._RDF.GetResource(EM_NS("appDisabled"));
if (extManager.datasource.hasArcOut(item, appDisabled)) {
var target = extManager.datasource.GetTarget(item, appDisabled, true);
if (target instanceof Components.interfaces.nsIRDFLiteral){
target = target.QueryInterface(Components.interfaces.nsIRDFLiteral);
return target.Value == "true";
}
}
return false;
},
/**
* Copy all nodes and assertions into the main datasource,
* renaming the install manifest to the id of the extension.
*/
_copyManifest: function _copyManifest(itemNode, manifestDS) {
// Copy all resources from the manifest to the main DS
var resources = manifestDS.GetAllResources();
while (resources.hasMoreElements()) {
var resource = resources.getNext().QueryInterface(Components.interfaces.nsIRDFResource);
// Get all arcs out of the resource
var arcs = manifestDS.ArcLabelsOut(resource);
while (arcs.hasMoreElements()) {
var arc = arcs.getNext().QueryInterface(Components.interfaces.nsIRDFResource);
// For each arc, get all targets
var targets = manifestDS.GetTargets(resource, arc, true);
while (targets.hasMoreElements()) {
var target = targets.getNext().QueryInterface(Components.interfaces.nsIRDFNode);
// If this resource is the manifest root, replace it
// with a resource representing the current addon
newResource = resource;
if (resource.Value == RDFURI_INSTALL_MANIFEST_ROOT) {
newResource = itemNode;
}
// Otherwise, assert into the main ds
this._datasource.Assert(newResource, arc, target, true);
}
}
}
},
/**
* Gets a datasource from a file.
* @param file
* The nsIFile that containing RDF/XML
* @returns RDF datasource
*/
_getDatasource: function _getDatasource(file) {
var ioServ = Components.classes["@mozilla.org/network/io-service;1"]
.getService(Components.interfaces.nsIIOService);
var fph = ioServ.getProtocolHandler("file")
.QueryInterface(Components.interfaces.nsIFileProtocolHandler);
var fileURL = fph.getURLSpecFromFile(file);
var ds = this._RDF.GetDataSourceBlocking(fileURL);
return ds;
},
_deinit: function _deinit() {
//debug("\nAddonMetadata: deinit\n");
this._RDF = null;
this._datasource = null;
},
// watch for XRE startup and shutdown messages
observe: function(subject, topic, data) {
var os = Components.classes["@mozilla.org/observer-service;1"]
.getService(Components.interfaces.nsIObserverService);
switch (topic) {
case "xpcom-shutdown":
os.removeObserver(this, "xpcom-shutdown");
this._deinit();
break;
}
},
_reportErrors: function _reportErrors(errorList) {
var consoleService = Components.classes["@mozilla.org/consoleservice;1"].
getService(Components.interfaces.nsIConsoleService);
for (var i = 0; i < errorList.length; i++) {
consoleService.logStringMessage("Addon Metadata Reader: " + errorList[i]);
debug("AddonMetadataReader: " + errorList[i] + "\n");
}
},
/**
* See nsISupports.idl
*/
QueryInterface: function(iid) {
if (!iid.equals(IID) &&
!iid.equals(Components.interfaces.nsIObserver) &&
!iid.equals(Components.interfaces.nsISupports))
throw Components.results.NS_ERROR_NO_INTERFACE;
// THIS IS SO WRONG!
// We can get away with it though since we really only want the datasource
// and never the object that builds it.
if (iid.equals(IID)) {
return this._datasource;
}
return this;
}
}; // AddonMetadata.prototype
/**
* ----------------------------------------------------------------------------
* Registration for XPCOM
* ----------------------------------------------------------------------------
*/
var gModule = {
registerSelf: function(componentManager, fileSpec, location, type) {
componentManager = componentManager.QueryInterface(Components.interfaces.nsIComponentRegistrar);
for (var key in this._objects) {
var obj = this._objects[key];
componentManager.registerFactoryLocation(obj.CID, obj.className, obj.contractID,
fileSpec, location, type);
}
},
getClassObject: function(componentManager, cid, iid) {
if (!iid.equals(Components.interfaces.nsIFactory))
throw Components.results.NS_ERROR_NOT_IMPLEMENTED;
for (var key in this._objects) {
if (cid.equals(this._objects[key].CID))
return this._objects[key].factory;
}
throw Components.results.NS_ERROR_NO_INTERFACE;
},
_makeFactory: #1= function(ctor) {
function ci(outer, iid) {
if (outer != null)
throw Components.results.NS_ERROR_NO_AGGREGATION;
return (new ctor()).QueryInterface(iid);
}
return { createInstance: ci };
},
_objects: {
AddonMetadata: { CID : CID,
contractID : CONTRACTID,
className : CLASSNAME,
factory : #1#(AddonMetadata)
},
},
canUnload: function(componentManager) {
return true;
}
}; // gModule
function NSGetModule(comMgr, fileSpec) {
return gModule;
} // NSGetModule