Merge branch 'master' of git://gitorious.org/owncloud/owncloud into oracle-support

Conflicts:
	3rdparty/Sabre/CardDAV/Plugin.php
	3rdparty/smb4php/smb.php
	apps/bookmarks/ajax/addBookmark.php
	apps/bookmarks/ajax/editBookmark.php
	apps/bookmarks/appinfo/migrate.php
	apps/calendar/ajax/calendar/edit.form.php
	apps/calendar/ajax/changeview.php
	apps/calendar/ajax/import/import.php
	apps/calendar/ajax/settings/guesstimezone.php
	apps/calendar/ajax/settings/setfirstday.php
	apps/calendar/ajax/settings/settimeformat.php
	apps/calendar/ajax/share/changepermission.php
	apps/calendar/ajax/share/share.php
	apps/calendar/ajax/share/unshare.php
	apps/calendar/appinfo/app.php
	apps/calendar/appinfo/remote.php
	apps/calendar/appinfo/update.php
	apps/calendar/appinfo/version
	apps/calendar/js/calendar.js
	apps/calendar/l10n/da.php
	apps/calendar/l10n/de.php
	apps/calendar/l10n/fi_FI.php
	apps/calendar/l10n/gl.php
	apps/calendar/l10n/he.php
	apps/calendar/l10n/hr.php
	apps/calendar/l10n/ja_JP.php
	apps/calendar/l10n/lb.php
	apps/calendar/l10n/lt_LT.php
	apps/calendar/l10n/nb_NO.php
	apps/calendar/l10n/pl.php
	apps/calendar/l10n/pt_PT.php
	apps/calendar/l10n/ro.php
	apps/calendar/l10n/ru.php
	apps/calendar/l10n/sv.php
	apps/calendar/l10n/zh_CN.php
	apps/calendar/l10n/zh_TW.php
	apps/calendar/lib/app.php
	apps/calendar/lib/calendar.php
	apps/calendar/lib/object.php
	apps/calendar/lib/share.php
	apps/calendar/templates/part.choosecalendar.rowfields.php
	apps/calendar/templates/part.import.php
	apps/calendar/templates/settings.php
	apps/contacts/ajax/activation.php
	apps/contacts/ajax/addressbook/delete.php
	apps/contacts/ajax/contact/add.php
	apps/contacts/ajax/contact/addproperty.php
	apps/contacts/ajax/contact/delete.php
	apps/contacts/ajax/contact/deleteproperty.php
	apps/contacts/ajax/contact/saveproperty.php
	apps/contacts/ajax/createaddressbook.php
	apps/contacts/ajax/cropphoto.php
	apps/contacts/ajax/currentphoto.php
	apps/contacts/ajax/importaddressbook.php
	apps/contacts/ajax/oc_photo.php
	apps/contacts/ajax/savecrop.php
	apps/contacts/ajax/selectaddressbook.php
	apps/contacts/ajax/updateaddressbook.php
	apps/contacts/ajax/uploadimport.php
	apps/contacts/ajax/uploadphoto.php
	apps/contacts/appinfo/migrate.php
	apps/contacts/appinfo/remote.php
	apps/contacts/css/contacts.css
	apps/contacts/import.php
	apps/contacts/index.php
	apps/contacts/js/contacts.js
	apps/contacts/l10n/ca.php
	apps/contacts/l10n/cs_CZ.php
	apps/contacts/l10n/da.php
	apps/contacts/l10n/de.php
	apps/contacts/l10n/el.php
	apps/contacts/l10n/eo.php
	apps/contacts/l10n/es.php
	apps/contacts/l10n/et_EE.php
	apps/contacts/l10n/eu.php
	apps/contacts/l10n/fa.php
	apps/contacts/l10n/fi_FI.php
	apps/contacts/l10n/fr.php
	apps/contacts/l10n/he.php
	apps/contacts/l10n/hr.php
	apps/contacts/l10n/hu_HU.php
	apps/contacts/l10n/ia.php
	apps/contacts/l10n/it.php
	apps/contacts/l10n/ja_JP.php
	apps/contacts/l10n/ko.php
	apps/contacts/l10n/lb.php
	apps/contacts/l10n/mk.php
	apps/contacts/l10n/nb_NO.php
	apps/contacts/l10n/nl.php
	apps/contacts/l10n/pl.php
	apps/contacts/l10n/pt_BR.php
	apps/contacts/l10n/pt_PT.php
	apps/contacts/l10n/ro.php
	apps/contacts/l10n/ru.php
	apps/contacts/l10n/sk_SK.php
	apps/contacts/l10n/sl.php
	apps/contacts/l10n/sv.php
	apps/contacts/l10n/th_TH.php
	apps/contacts/l10n/tr.php
	apps/contacts/l10n/zh_CN.php
	apps/contacts/l10n/zh_TW.php
	apps/contacts/lib/addressbook.php
	apps/contacts/lib/hooks.php
	apps/contacts/lib/vcard.php
	apps/contacts/photo.php
	apps/contacts/templates/part.contact.php
	apps/contacts/templates/part.contacts.php
	apps/contacts/templates/part.cropphoto.php
	apps/contacts/templates/part.importaddressbook.php
	apps/contacts/templates/part.selectaddressbook.php
	apps/contacts/thumbnail.php
	apps/files/ajax/download.php
	apps/files/ajax/newfile.php
	apps/files/ajax/timezone.php
	apps/files/appinfo/update.php
	apps/files/appinfo/version
	apps/files/index.php
	apps/files/js/fileactions.js
	apps/files/js/filelist.js
	apps/files/js/files.js
	apps/files/l10n/ar.php
	apps/files/l10n/bg_BG.php
	apps/files/l10n/ca.php
	apps/files/l10n/cs_CZ.php
	apps/files/l10n/da.php
	apps/files/l10n/de.php
	apps/files/l10n/el.php
	apps/files/l10n/eo.php
	apps/files/l10n/es.php
	apps/files/l10n/et_EE.php
	apps/files/l10n/eu.php
	apps/files/l10n/fa.php
	apps/files/l10n/fi_FI.php
	apps/files/l10n/fr.php
	apps/files/l10n/gl.php
	apps/files/l10n/he.php
	apps/files/l10n/hr.php
	apps/files/l10n/hu_HU.php
	apps/files/l10n/ia.php
	apps/files/l10n/id.php
	apps/files/l10n/it.php
	apps/files/l10n/ja_JP.php
	apps/files/l10n/ko.php
	apps/files/l10n/lb.php
	apps/files/l10n/lt_LT.php
	apps/files/l10n/mk.php
	apps/files/l10n/ms_MY.php
	apps/files/l10n/nb_NO.php
	apps/files/l10n/nl.php
	apps/files/l10n/nn_NO.php
	apps/files/l10n/pl.php
	apps/files/l10n/pt_BR.php
	apps/files/l10n/pt_PT.php
	apps/files/l10n/ro.php
	apps/files/l10n/ru.php
	apps/files/l10n/sk_SK.php
	apps/files/l10n/sl.php
	apps/files/l10n/sr.php
	apps/files/l10n/sr@latin.php
	apps/files/l10n/sv.php
	apps/files/l10n/th_TH.php
	apps/files/l10n/tr.php
	apps/files/l10n/uk.php
	apps/files/l10n/zh_CN.php
	apps/files/l10n/zh_TW.php
	apps/files_archive/js/archive.js
	apps/files_encryption/lib/cryptstream.php
	apps/files_encryption/lib/proxy.php
	apps/files_encryption/tests/proxy.php
	apps/files_external/appinfo/app.php
	apps/files_external/lib/smb.php
	apps/files_external/lib/streamwrapper.php
	apps/files_external/tests/config.php
	apps/files_external/tests/smb.php
	apps/files_sharing/ajax/email.php
	apps/files_sharing/ajax/getitem.php
	apps/files_sharing/ajax/setpermissions.php
	apps/files_sharing/ajax/share.php
	apps/files_sharing/ajax/toggleresharing.php
	apps/files_sharing/ajax/unshare.php
	apps/files_sharing/ajax/userautocomplete.php
	apps/files_sharing/js/settings.js
	apps/files_sharing/js/share.js
	apps/files_sharing/lib_share.php
	apps/files_sharing/settings.php
	apps/files_sharing/sharedstorage.php
	apps/files_sharing/templates/settings.php
	apps/files_versions/ajax/rollbackVersion.php
	apps/files_versions/versions.php
	apps/gallery/ajax/thumbnail.php
	apps/gallery/appinfo/app.php
	apps/gallery/appinfo/update.php
	apps/gallery/appinfo/version
	apps/gallery/css/styles.css
	apps/gallery/index.php
	apps/gallery/js/pictures.js
	apps/gallery/l10n/ca.php
	apps/gallery/l10n/cs_CZ.php
	apps/gallery/l10n/de.php
	apps/gallery/l10n/el.php
	apps/gallery/l10n/es.php
	apps/gallery/l10n/fi_FI.php
	apps/gallery/l10n/fr.php
	apps/gallery/l10n/it.php
	apps/gallery/l10n/pl.php
	apps/gallery/l10n/pt_PT.php
	apps/gallery/l10n/ru.php
	apps/gallery/l10n/sl.php
	apps/gallery/l10n/sv.php
	apps/gallery/l10n/th_TH.php
	apps/gallery/l10n/tr.php
	apps/gallery/l10n/zh_CN.php
	apps/gallery/lib/album.php
	apps/gallery/lib/hooks_handlers.php
	apps/gallery/lib/managers.php
	apps/gallery/lib/photo.php
	apps/gallery/lib/tiles.php
	apps/gallery/lib/tiles_test.php
	apps/gallery/templates/index.php
	apps/media/lib_ampache.php
	apps/media/lib_collection.php
	apps/media/lib_media.php
	apps/remoteStorage/lib_remoteStorage.php
	apps/tasks/ajax/addtaskform.php
	apps/tasks/ajax/edittask.php
	apps/user_ldap/appinfo/update.php
	apps/user_ldap/group_ldap.php
	apps/user_ldap/lib_ldap.php
	apps/user_ldap/settings.php
	apps/user_ldap/templates/settings.php
	apps/user_ldap/user_ldap.php
	apps/user_migrate/appinfo/app.php
	apps/user_migrate/templates/settings.php
	apps/user_webfinger/host-meta.php
	config/config.sample.php
	core/js/js.js
	core/l10n/da.php
	core/l10n/de.php
	core/l10n/fi_FI.php
	core/l10n/gl.php
	core/l10n/he.php
	core/l10n/hr.php
	core/l10n/id.php
	core/l10n/ja_JP.php
	core/l10n/lb.php
	core/l10n/lt_LT.php
	core/l10n/nb_NO.php
	core/l10n/pl.php
	core/l10n/pt_PT.php
	core/l10n/ro.php
	core/l10n/ru.php
	core/l10n/sv.php
	core/lostpassword/index.php
	core/templates/layout.user.php
	core/templates/login.php
	db_structure.xml
	index.php
	l10n/af/calendar.po
	l10n/af/contacts.po
	l10n/af/core.po
	l10n/af/files.po
	l10n/af/settings.po
	l10n/ar/calendar.po
	l10n/ar/contacts.po
	l10n/ar/core.po
	l10n/ar/files.po
	l10n/ar/media.po
	l10n/ar/settings.po
	l10n/bg_BG/calendar.po
	l10n/bg_BG/contacts.po
	l10n/bg_BG/core.po
	l10n/bg_BG/files.po
	l10n/bg_BG/media.po
	l10n/bg_BG/settings.po
	l10n/ca/calendar.po
	l10n/ca/contacts.po
	l10n/ca/core.po
	l10n/ca/files.po
	l10n/ca/gallery.po
	l10n/ca/settings.po
	l10n/cs_CZ/calendar.po
	l10n/cs_CZ/contacts.po
	l10n/cs_CZ/core.po
	l10n/cs_CZ/files.po
	l10n/cs_CZ/gallery.po
	l10n/cs_CZ/settings.po
	l10n/da/calendar.po
	l10n/da/contacts.po
	l10n/da/core.po
	l10n/da/files.po
	l10n/da/settings.po
	l10n/de/calendar.po
	l10n/de/contacts.po
	l10n/de/core.po
	l10n/de/files.po
	l10n/de/gallery.po
	l10n/de/settings.po
	l10n/el/calendar.po
	l10n/el/contacts.po
	l10n/el/core.po
	l10n/el/files.po
	l10n/el/gallery.po
	l10n/el/settings.po
	l10n/eo/calendar.po
	l10n/eo/contacts.po
	l10n/eo/core.po
	l10n/eo/files.po
	l10n/eo/media.po
	l10n/eo/settings.po
	l10n/es/calendar.po
	l10n/es/contacts.po
	l10n/es/core.po
	l10n/es/files.po
	l10n/es/gallery.po
	l10n/es/settings.po
	l10n/et_EE/calendar.po
	l10n/et_EE/contacts.po
	l10n/et_EE/core.po
	l10n/et_EE/files.po
	l10n/et_EE/settings.po
	l10n/eu/calendar.po
	l10n/eu/contacts.po
	l10n/eu/core.po
	l10n/eu/files.po
	l10n/eu/settings.po
	l10n/fa/calendar.po
	l10n/fa/contacts.po
	l10n/fa/core.po
	l10n/fa/files.po
	l10n/fa/settings.po
	l10n/fi_FI/calendar.po
	l10n/fi_FI/contacts.po
	l10n/fi_FI/core.po
	l10n/fi_FI/files.po
	l10n/fi_FI/gallery.po
	l10n/fi_FI/settings.po
	l10n/fr/calendar.po
	l10n/fr/contacts.po
	l10n/fr/core.po
	l10n/fr/files.po
	l10n/fr/gallery.po
	l10n/fr/media.po
	l10n/fr/settings.po
	l10n/gl/calendar.po
	l10n/gl/contacts.po
	l10n/gl/core.po
	l10n/gl/files.po
	l10n/gl/settings.po
	l10n/he/calendar.po
	l10n/he/contacts.po
	l10n/he/core.po
	l10n/he/files.po
	l10n/he/settings.po
	l10n/hr/calendar.po
	l10n/hr/contacts.po
	l10n/hr/core.po
	l10n/hr/files.po
	l10n/hr/settings.po
	l10n/hu_HU/calendar.po
	l10n/hu_HU/contacts.po
	l10n/hu_HU/core.po
	l10n/hu_HU/files.po
	l10n/hu_HU/settings.po
	l10n/hy/calendar.po
	l10n/hy/contacts.po
	l10n/hy/core.po
	l10n/hy/files.po
	l10n/hy/settings.po
	l10n/ia/calendar.po
	l10n/ia/contacts.po
	l10n/ia/core.po
	l10n/ia/files.po
	l10n/ia/settings.po
	l10n/id/calendar.po
	l10n/id/contacts.po
	l10n/id/core.po
	l10n/id/files.po
	l10n/id/settings.po
	l10n/it/calendar.po
	l10n/it/contacts.po
	l10n/it/core.po
	l10n/it/files.po
	l10n/it/gallery.po
	l10n/it/settings.po
	l10n/ja_JP/calendar.po
	l10n/ja_JP/contacts.po
	l10n/ja_JP/core.po
	l10n/ja_JP/files.po
	l10n/ja_JP/settings.po
	l10n/ko/calendar.po
	l10n/ko/contacts.po
	l10n/ko/core.po
	l10n/ko/files.po
	l10n/ko/settings.po
	l10n/lb/calendar.po
	l10n/lb/contacts.po
	l10n/lb/core.po
	l10n/lb/files.po
	l10n/lb/settings.po
	l10n/lt_LT/calendar.po
	l10n/lt_LT/contacts.po
	l10n/lt_LT/core.po
	l10n/lt_LT/files.po
	l10n/lt_LT/settings.po
	l10n/mk/calendar.po
	l10n/mk/contacts.po
	l10n/mk/core.po
	l10n/mk/files.po
	l10n/mk/settings.po
	l10n/ms_MY/calendar.po
	l10n/ms_MY/contacts.po
	l10n/ms_MY/core.po
	l10n/ms_MY/files.po
	l10n/ms_MY/settings.po
	l10n/nb_NO/calendar.po
	l10n/nb_NO/contacts.po
	l10n/nb_NO/core.po
	l10n/nb_NO/files.po
	l10n/nb_NO/settings.po
	l10n/nl/calendar.po
	l10n/nl/contacts.po
	l10n/nl/core.po
	l10n/nl/files.po
	l10n/nl/settings.po
	l10n/nn_NO/calendar.po
	l10n/nn_NO/contacts.po
	l10n/nn_NO/core.po
	l10n/nn_NO/files.po
	l10n/nn_NO/settings.po
	l10n/pl/calendar.po
	l10n/pl/contacts.po
	l10n/pl/core.po
	l10n/pl/files.po
	l10n/pl/gallery.po
	l10n/pl/settings.po
	l10n/pt_BR/calendar.po
	l10n/pt_BR/contacts.po
	l10n/pt_BR/core.po
	l10n/pt_BR/files.po
	l10n/pt_BR/settings.po
	l10n/pt_PT/calendar.po
	l10n/pt_PT/contacts.po
	l10n/pt_PT/core.po
	l10n/pt_PT/files.po
	l10n/pt_PT/gallery.po
	l10n/pt_PT/settings.po
	l10n/ro/calendar.po
	l10n/ro/contacts.po
	l10n/ro/core.po
	l10n/ro/files.po
	l10n/ro/settings.po
	l10n/ru/calendar.po
	l10n/ru/contacts.po
	l10n/ru/core.po
	l10n/ru/files.po
	l10n/ru/gallery.po
	l10n/ru/settings.po
	l10n/sk_SK/calendar.po
	l10n/sk_SK/contacts.po
	l10n/sk_SK/core.po
	l10n/sk_SK/files.po
	l10n/sk_SK/settings.po
	l10n/sl/calendar.po
	l10n/sl/contacts.po
	l10n/sl/core.po
	l10n/sl/files.po
	l10n/sl/gallery.po
	l10n/sl/settings.po
	l10n/sr/calendar.po
	l10n/sr/contacts.po
	l10n/sr/core.po
	l10n/sr/files.po
	l10n/sr/settings.po
	l10n/sr@latin/calendar.po
	l10n/sr@latin/contacts.po
	l10n/sr@latin/core.po
	l10n/sr@latin/files.po
	l10n/sr@latin/settings.po
	l10n/sv/calendar.po
	l10n/sv/contacts.po
	l10n/sv/core.po
	l10n/sv/files.po
	l10n/sv/gallery.po
	l10n/sv/media.po
	l10n/sv/settings.po
	l10n/templates/bookmarks.pot
	l10n/templates/calendar.pot
	l10n/templates/contacts.pot
	l10n/templates/core.pot
	l10n/templates/files.pot
	l10n/templates/gallery.pot
	l10n/templates/media.pot
	l10n/templates/settings.pot
	l10n/th_TH/calendar.po
	l10n/th_TH/contacts.po
	l10n/th_TH/core.po
	l10n/th_TH/files.po
	l10n/th_TH/gallery.po
	l10n/th_TH/settings.po
	l10n/tr/calendar.po
	l10n/tr/contacts.po
	l10n/tr/core.po
	l10n/tr/files.po
	l10n/tr/gallery.po
	l10n/tr/settings.po
	l10n/uk/calendar.po
	l10n/uk/contacts.po
	l10n/uk/core.po
	l10n/uk/files.po
	l10n/uk/media.po
	l10n/uk/settings.po
	l10n/zh_CN/calendar.po
	l10n/zh_CN/contacts.po
	l10n/zh_CN/core.po
	l10n/zh_CN/files.po
	l10n/zh_CN/gallery.po
	l10n/zh_CN/settings.po
	l10n/zh_TW/calendar.po
	l10n/zh_TW/contacts.po
	l10n/zh_TW/core.po
	l10n/zh_TW/files.po
	l10n/zh_TW/settings.po
	lib/app.php
	lib/base.php
	lib/connector/sabre/file.php
	lib/connector/sabre/locks.php
	lib/connector/sabre/node.php
	lib/db.php
	lib/filecache.php
	lib/fileproxy/quota.php
	lib/files.php
	lib/filestorage/local.php
	lib/filesystemview.php
	lib/group/database.php
	lib/helper.php
	lib/installer.php
	lib/json.php
	lib/l10n.php
	lib/migrate.php
	lib/mimetypes.fixlist.php
	lib/ocs.php
	lib/preferences.php
	lib/public/json.php
	lib/public/util.php
	lib/template.php
	lib/user.php
	lib/user/database.php
	lib/util.php
	lib/vcategories.php
	ocs/providers.php
	settings/admin.php
	settings/ajax/lostpassword.php
	settings/ajax/removeuser.php
	settings/ajax/setbackgroundjobsmode.php
	settings/ajax/setlanguage.php
	settings/ajax/setquota.php
	settings/ajax/togglegroups.php
	settings/apps.php
	settings/css/settings.css
	settings/js/apps.js
	settings/js/users.js
	settings/l10n/bg_BG.php
	settings/l10n/ca.php
	settings/l10n/cs_CZ.php
	settings/l10n/da.php
	settings/l10n/de.php
	settings/l10n/el.php
	settings/l10n/eo.php
	settings/l10n/es.php
	settings/l10n/et_EE.php
	settings/l10n/eu.php
	settings/l10n/fa.php
	settings/l10n/fi_FI.php
	settings/l10n/fr.php
	settings/l10n/gl.php
	settings/l10n/he.php
	settings/l10n/hr.php
	settings/l10n/hu_HU.php
	settings/l10n/it.php
	settings/l10n/ja_JP.php
	settings/l10n/ko.php
	settings/l10n/lt_LT.php
	settings/l10n/mk.php
	settings/l10n/ms_MY.php
	settings/l10n/nb_NO.php
	settings/l10n/nl.php
	settings/l10n/nn_NO.php
	settings/l10n/pl.php
	settings/l10n/pt_BR.php
	settings/l10n/pt_PT.php
	settings/l10n/ru.php
	settings/l10n/sk_SK.php
	settings/l10n/sl.php
	settings/l10n/sv.php
	settings/l10n/th_TH.php
	settings/l10n/tr.php
	settings/l10n/zh_CN.php
	settings/personal.php
	settings/templates/admin.php
	settings/templates/users.php

1 files changed, 79 insertions, 44 deletions

diff --git a/lib/user.php b/lib/user.php
index 9e0e82e79fe..06a56b7f4a6 100644
--- a/lib/user.php
+++ b/lib/user.php
@@ -3,7 +3,7 @@
  * ownCloud
  *
  * @author Frank Karlitschek
- * @copyright 2010 Frank Karlitschek karlitschek@kde.org
+ * @copyright 2012 Frank Karlitschek frank@owncloud.org
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
@@ -21,7 +21,9 @@
  */
 
 /**
- * This class provides all methods for user management.
+ * This class provides wrapper methods for user management. Multiple backends are
+ * supported. User management operations are delegated to the configured backend for
+ * execution.
  *
  * Hooks provided:
  *   pre_createUser(&run, uid, password)
@@ -48,8 +50,8 @@ class OC_User {
 	 *
 	 * Makes a list of backends that can be used by other modules
 	 */
-	public static function registerBackend( $name ){
-		self::$_backends[] = $name;
+	public static function registerBackend( $backend ){
+		self::$_backends[] = $backend;
 		return true;
 	}
 
@@ -81,28 +83,38 @@ class OC_User {
 	 * Set the User Authentication Module
 	 */
 	public static function useBackend( $backend = 'database' ){
-		// You'll never know what happens
-		if( null === $backend OR !is_string( $backend )){
-			$backend = 'database';
-		}
+		if($backend instanceof OC_User_Interface){
+			self::$_usedBackends[get_class($backend)]=$backend;
+		}else{
+			// You'll never know what happens
+			if( null === $backend OR !is_string( $backend )){
+				$backend = 'database';
+			}
 
-		// Load backend
-		switch( $backend ){
-			case 'database':
-			case 'mysql':
-			case 'sqlite':
-				self::$_usedBackends[$backend] = new OC_User_Database();
-				break;
-			default:
-				$className = 'OC_USER_' . strToUpper($backend);
-				self::$_usedBackends[$backend] = new $className();
-				break;
+			// Load backend
+			switch( $backend ){
+				case 'database':
+				case 'mysql':
+				case 'sqlite':
+					self::$_usedBackends[$backend] = new OC_User_Database();
+					break;
+				default:
+					$className = 'OC_USER_' . strToUpper($backend);
+					self::$_usedBackends[$backend] = new $className();
+					break;
+			}
 		}
-
 		true;
 	}
 
 	/**
+	 * remove all used backends
+	 */
+	public static function clearBackends(){
+		self::$_usedBackends=array();
+	}
+
+	/**
 	 * @brief Create a new user
 	 * @param $uid The username of the user to create
 	 * @param $password The password of the new user
@@ -166,9 +178,7 @@ class OC_User {
 		if( $run ){
 			//delete the user from all backends
 			foreach(self::$_usedBackends as $backend){
-				if($backend->implementsActions(OC_USER_BACKEND_DELETE_USER)){
-					$backend->deleteUser($uid);
-				}
+				$backend->deleteUser($uid);
 			}
 			// We have to delete the user from all groups
 			foreach( OC_Group::getUserGroups( $uid ) as $i ){
@@ -198,8 +208,9 @@ class OC_User {
 		OC_Hook::emit( "OC_User", "pre_login", array( "run" => &$run, "uid" => $uid ));
 
 		if( $run ){
-			$uid=self::checkPassword( $uid, $password );
-			if($uid){
+			$uid = self::checkPassword( $uid, $password );
+			$enabled = self::isEnabled($uid);
+			if($uid && $enabled){
 				session_regenerate_id(true);
 				self::setUserId($uid);
 				OC_Hook::emit( "OC_User", "post_login", array( "uid" => $uid, 'password'=>$password ));
@@ -240,17 +251,13 @@ class OC_User {
 	 * Checks if the user is logged in
 	 */
 	public static function isLoggedIn(){
-		static $is_login_checked = null;
-		if (!is_null($is_login_checked)) {
-			return $is_login_checked;
-		}
 		if( isset($_SESSION['user_id']) AND $_SESSION['user_id']) {
 			OC_App::loadApps(array('authentication'));
 			if (self::userExists($_SESSION['user_id']) ){
-				return $is_login_checked = true;
+				return true;
 			}
 		}
-		return $is_login_checked = false;
+		return false;
 	}
 
 	/**
@@ -331,14 +338,12 @@ class OC_User {
 	 *
 	 * Get a list of all users.
 	 */
-	public static function getUsers(){
-		$users=array();
-		foreach(self::$_usedBackends as $backend){
-			if($backend->implementsActions(OC_USER_BACKEND_GET_USERS)){
-				$backendUsers=$backend->getUsers();
-				if(is_array($backendUsers)){
-					$users=array_merge($users,$backendUsers);
-				}
+	public static function getUsers($search = '', $limit = null, $offset = null) {
+		$users = array();
+		foreach (self::$_usedBackends as $backend) {
+			$backendUsers = $backend->getUsers($search, $limit, $offset);
+			if (is_array($backendUsers)) {
+				$users = array_merge($users, $backendUsers);
 			}
 		}
 		asort($users);
@@ -352,15 +357,45 @@ class OC_User {
 	 */
 	public static function userExists($uid){
 		foreach(self::$_usedBackends as $backend){
-			if($backend->implementsActions(OC_USER_BACKEND_USER_EXISTS)){
-				$result=$backend->userExists($uid);
-				if($result===true){
-					return true;
-				}
+			$result=$backend->userExists($uid);
+			if($result===true){
+				return true;
 			}
 		}
 		return false;
 	}
+	
+	/**
+	 * disables a user
+	 * @param string $userid the user to disable
+	 */
+	public static function disableUser($userid){
+		$query = "INSERT INTO `*PREFIX*preferences` (`userid`, `appid`, `configkey`, `configvalue`) VALUES(?, ?, ?, ?)";
+		$query = OC_DB::prepare($query);
+		$query->execute(array($userid, 'core', 'enabled', 'false'));
+	}
+	
+	/**
+	 * enable a user
+	 * @param string $userid
+	 */
+	public static function enableUser($userid){
+		$query = "DELETE FROM `*PREFIX*preferences` WHERE `userid` = ? AND `appid` = ? AND `configkey` = ? AND `configvalue` = ?";
+		$query = OC_DB::prepare($query);
+		$query->execute(array($userid, 'core', 'enabled', 'false'));
+	}
+	
+	/**
+	 * checks if a user is enabled
+	 * @param string $userid
+	 * @return bool
+	 */
+	public static function isEnabled($userid){
+		$query = "SELECT `userid` FROM `*PREFIX*preferences` WHERE `userid` = ? AND `appid` = ? AND `configkey` = ? AND `configvalue` = ?";
+		$query = OC_DB::prepare($query);
+		$results = $query->execute(array($userid, 'core', 'enabled', 'false'));
+		return $results->numRows() ? false : true;
+	}
 
 	/**
 	 * @brief Set cookie value to use in next page load