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diff --git a/www/wiki/includes/Preferences.php b/www/wiki/includes/Preferences.php
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+++ b/www/wiki/includes/Preferences.php
@@ -0,0 +1,338 @@
+<?php
+/**
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+use MediaWiki\Auth\AuthManager;
+use MediaWiki\MediaWikiServices;
+use MediaWiki\Preferences\DefaultPreferencesFactory;
+
+/**
+ * This class has been replaced by the PreferencesFactory service.
+ *
+ * @deprecated since 1.31 use the PreferencesFactory service instead.
+ */
+class Preferences {
+
+	/**
+	 * A shim to maintain backwards-compatibility of this class, basically replicating the
+	 * default behaviour of the PreferencesFactory service but not permitting overriding.
+	 * @return DefaultPreferencesFactory
+	 */
+	protected static function getDefaultPreferencesFactory() {
+		global $wgContLang;
+		$authManager = AuthManager::singleton();
+		$linkRenderer = MediaWikiServices::getInstance()->getLinkRenderer();
+		$config = MediaWikiServices::getInstance()->getMainConfig();
+		$preferencesFactory = new DefaultPreferencesFactory(
+			$config, $wgContLang, $authManager, $linkRenderer
+		);
+		return $preferencesFactory;
+	}
+
+	/**
+	 * @return array
+	 */
+	public static function getSaveBlacklist() {
+		throw new Exception( __METHOD__ . '() is deprecated and does nothing' );
+	}
+
+	/**
+	 * @throws MWException
+	 * @param User $user
+	 * @param IContextSource $context
+	 * @return array|null
+	 */
+	public static function getPreferences( $user, IContextSource $context ) {
+		$preferencesFactory = self::getDefaultPreferencesFactory();
+		return $preferencesFactory->getFormDescriptor( $user, $context );
+	}
+
+	/**
+	 * Loads existing values for a given array of preferences
+	 * @throws MWException
+	 * @param User $user
+	 * @param IContextSource $context
+	 * @param array &$defaultPreferences Array to load values for
+	 * @return array|null
+	 */
+	public static function loadPreferenceValues( $user, $context, &$defaultPreferences ) {
+		throw new Exception( __METHOD__ . '() is deprecated and does nothing' );
+	}
+
+	/**
+	 * Pull option from a user account. Handles stuff like array-type preferences.
+	 *
+	 * @param string $name
+	 * @param array $info
+	 * @param User $user
+	 * @return array|string
+	 */
+	public static function getOptionFromUser( $name, $info, $user ) {
+		throw new Exception( __METHOD__ . '() is deprecated and does nothing' );
+	}
+
+	/**
+	 * @param User $user
+	 * @param IContextSource $context
+	 * @param array &$defaultPreferences
+	 * @return void
+	 */
+	public static function profilePreferences(
+		$user, IContextSource $context, &$defaultPreferences
+	) {
+		wfDeprecated( __METHOD__, '1.31' );
+		$defaultPreferences = self::getPreferences( $user, $context );
+	}
+
+	/**
+	 * @param User $user
+	 * @param IContextSource $context
+	 * @param array &$defaultPreferences
+	 * @return void
+	 */
+	public static function skinPreferences( $user, IContextSource $context, &$defaultPreferences ) {
+		wfDeprecated( __METHOD__, '1.31' );
+		$defaultPreferences = self::getPreferences( $user, $context );
+	}
+
+	/**
+	 * @param User $user
+	 * @param IContextSource $context
+	 * @param array &$defaultPreferences
+	 */
+	public static function filesPreferences(
+		$user, IContextSource $context, &$defaultPreferences
+	) {
+		wfDeprecated( __METHOD__, '1.31' );
+		$defaultPreferences = self::getPreferences( $user, $context );
+	}
+
+	/**
+	 * @param User $user
+	 * @param IContextSource $context
+	 * @param array &$defaultPreferences
+	 * @return void
+	 */
+	public static function datetimePreferences(
+		$user, IContextSource $context, &$defaultPreferences
+	) {
+		wfDeprecated( __METHOD__, '1.31' );
+		$defaultPreferences = self::getPreferences( $user, $context );
+	}
+
+	/**
+	 * @param User $user
+	 * @param IContextSource $context
+	 * @param array &$defaultPreferences
+	 */
+	public static function renderingPreferences(
+		$user, IContextSource $context, &$defaultPreferences
+	) {
+		wfDeprecated( __METHOD__, '1.31' );
+		$defaultPreferences = self::getPreferences( $user, $context );
+	}
+
+	/**
+	 * @param User $user
+	 * @param IContextSource $context
+	 * @param array &$defaultPreferences
+	 */
+	public static function editingPreferences(
+		$user, IContextSource $context, &$defaultPreferences
+	) {
+		wfDeprecated( __METHOD__, '1.31' );
+		$defaultPreferences = self::getPreferences( $user, $context );
+	}
+
+	/**
+	 * @param User $user
+	 * @param IContextSource $context
+	 * @param array &$defaultPreferences
+	 */
+	public static function rcPreferences( $user, IContextSource $context, &$defaultPreferences ) {
+		wfDeprecated( __METHOD__, '1.31' );
+		$defaultPreferences = self::getPreferences( $user, $context );
+	}
+
+	/**
+	 * @param User $user
+	 * @param IContextSource $context
+	 * @param array &$defaultPreferences
+	 */
+	public static function watchlistPreferences(
+		$user, IContextSource $context, &$defaultPreferences
+	) {
+		wfDeprecated( __METHOD__, '1.31' );
+		$defaultPreferences = self::getPreferences( $user, $context );
+	}
+
+	/**
+	 * @param User $user
+	 * @param IContextSource $context
+	 * @param array &$defaultPreferences
+	 */
+	public static function searchPreferences(
+		$user, IContextSource $context, &$defaultPreferences
+	) {
+		wfDeprecated( __METHOD__, '1.31' );
+		$defaultPreferences = self::getPreferences( $user, $context );
+	}
+
+	/**
+	 * Dummy, kept for backwards-compatibility.
+	 * @param User $user
+	 * @param IContextSource $context
+	 * @param array &$defaultPreferences
+	 */
+	public static function miscPreferences( $user, IContextSource $context, &$defaultPreferences ) {
+	}
+
+	/**
+	 * @param User $user
+	 * @param IContextSource $context
+	 * @return array Text/links to display as key; $skinkey as value
+	 */
+	public static function generateSkinOptions( $user, IContextSource $context ) {
+		wfDeprecated( __METHOD__, '1.31' );
+		return self::getPreferences( $user, $context );
+	}
+
+	/**
+	 * @param IContextSource $context
+	 * @return array
+	 */
+	static function getDateOptions( IContextSource $context ) {
+		throw new Exception( __METHOD__ . '() is deprecated and does nothing' );
+	}
+
+	/**
+	 * @param IContextSource $context
+	 * @return array
+	 */
+	public static function getImageSizes( IContextSource $context ) {
+		throw new Exception( __METHOD__ . '() is deprecated and does nothing' );
+	}
+
+	/**
+	 * @param IContextSource $context
+	 * @return array
+	 */
+	public static function getThumbSizes( IContextSource $context ) {
+		throw new Exception( __METHOD__ . '() is deprecated and does nothing' );
+	}
+
+	/**
+	 * @param string $signature
+	 * @param array $alldata
+	 * @param HTMLForm $form
+	 * @return bool|string
+	 */
+	public static function validateSignature( $signature, $alldata, $form ) {
+		throw new Exception( __METHOD__ . '() is deprecated and does nothing' );
+	}
+
+	/**
+	 * @param string $signature
+	 * @param array $alldata
+	 * @param HTMLForm $form
+	 * @return string
+	 */
+	public static function cleanSignature( $signature, $alldata, $form ) {
+		throw new Exception( __METHOD__ . '() is deprecated and does nothing now' );
+	}
+
+	/**
+	 * @param User $user
+	 * @param IContextSource $context
+	 * @param string $formClass
+	 * @param array $remove Array of items to remove
+	 * @return PreferencesForm|HTMLForm
+	 */
+	public static function getFormObject(
+		$user,
+		IContextSource $context,
+		$formClass = PreferencesForm::class,
+		array $remove = []
+	) {
+		$preferencesFactory = self::getDefaultPreferencesFactory();
+		return $preferencesFactory->getForm( $user, $context, $formClass, $remove );
+	}
+
+	/**
+	 * @param IContextSource $context
+	 * @return array
+	 */
+	public static function getTimezoneOptions( IContextSource $context ) {
+		throw new Exception( __METHOD__ . '() is deprecated and does nothing' );
+	}
+
+	/**
+	 * @param string $value
+	 * @param array $alldata
+	 * @return int
+	 */
+	public static function filterIntval( $value, $alldata ) {
+		throw new Exception( __METHOD__ . '() is deprecated and does nothing' );
+	}
+
+	/**
+	 * @param string $tz
+	 * @param array $alldata
+	 * @return string
+	 */
+	public static function filterTimezoneInput( $tz, $alldata ) {
+		throw new Exception( __METHOD__ . '() is deprecated and does nothing' );
+	}
+
+	/**
+	 * Handle the form submission if everything validated properly
+	 *
+	 * @deprecated since 1.31, use PreferencesFactory
+	 *
+	 * @param array $formData
+	 * @param PreferencesForm $form
+	 * @return bool|Status|string
+	 */
+	public static function tryFormSubmit( $formData, $form ) {
+		$preferencesFactory = self::getDefaultPreferencesFactory();
+		return $preferencesFactory->legacySaveFormData( $formData, $form );
+	}
+
+	/**
+	 * @param array $formData
+	 * @param PreferencesForm $form
+	 * @return Status
+	 */
+	public static function tryUISubmit( $formData, $form ) {
+		$preferencesFactory = self::getDefaultPreferencesFactory();
+		return $preferencesFactory->legacySubmitForm( $formData, $form );
+	}
+
+	/**
+	 * Get a list of all time zones
+	 * @param Language $language Language used for the localized names
+	 * @return array A list of all time zones. The system name of the time zone is used as key and
+	 *  the value is an array which contains localized name, the timecorrection value used for
+	 *  preferences and the region
+	 * @since 1.26
+	 */
+	public static function getTimeZoneList( Language $language ) {
+		throw new Exception( __METHOD__ . '() is deprecated and does nothing' );
+	}
+}