Preferences.php

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<?php
use MediaWiki\Auth\AuthManager;
use MediaWiki\Auth\PasswordAuthenticationRequest;

class Preferences {
    protected static $defaultPreferences = null;

    protected static $saveFilters = [
        'timecorrection' => [ 'Preferences', 'filterTimezoneInput' ],
        'cols' => [ 'Preferences', 'filterIntval' ],
        'rows' => [ 'Preferences', 'filterIntval' ],
        'rclimit' => [ 'Preferences', 'filterIntval' ],
        'wllimit' => [ 'Preferences', 'filterIntval' ],
        'searchlimit' => [ 'Preferences', 'filterIntval' ],
    ];

    // Stuff that shouldn't be saved as a preference.
    private static $saveBlacklist = [
        'realname',
        'emailaddress',
    ];

    static function getSaveBlacklist() {
        return self::$saveBlacklist;
    }

    static function getPreferences( $user, IContextSource $context ) {
        if ( self::$defaultPreferences ) {
            return self::$defaultPreferences;
        }

        $defaultPreferences = [];

        self::profilePreferences( $user, $context, $defaultPreferences );
        self::skinPreferences( $user, $context, $defaultPreferences );
        self::datetimePreferences( $user, $context, $defaultPreferences );
        self::filesPreferences( $user, $context, $defaultPreferences );
        self::renderingPreferences( $user, $context, $defaultPreferences );
        self::editingPreferences( $user, $context, $defaultPreferences );
        self::rcPreferences( $user, $context, $defaultPreferences );
        self::watchlistPreferences( $user, $context, $defaultPreferences );
        self::searchPreferences( $user, $context, $defaultPreferences );
        self::miscPreferences( $user, $context, $defaultPreferences );

        Hooks::run( 'GetPreferences', [ $user, &$defaultPreferences ] );

        self::loadPreferenceValues( $user, $context, $defaultPreferences );
        self::$defaultPreferences = $defaultPreferences;
        return $defaultPreferences;
    }

    static function loadPreferenceValues( $user, $context, &$defaultPreferences ) {
        # # Remove preferences that wikis don't want to use
        foreach ( $context->getConfig()->get( 'HiddenPrefs' ) as $pref ) {
            if ( isset( $defaultPreferences[$pref] ) ) {
                unset( $defaultPreferences[$pref] );
            }
        }

        # # Make sure that form fields have their parent set. See bug 41337.
        $dummyForm = new HTMLForm( [], $context );

        $disable = !$user->isAllowed( 'editmyoptions' );

        $defaultOptions = User::getDefaultOptions();
        # # Prod in defaults from the user
        foreach ( $defaultPreferences as $name => &$info ) {
            $prefFromUser = self::getOptionFromUser( $name, $info, $user );
            if ( $disable && !in_array( $name, self::$saveBlacklist ) ) {
                $info['disabled'] = 'disabled';
            }
            $field = HTMLForm::loadInputFromParameters( $name, $info, $dummyForm ); // For validation
            $globalDefault = isset( $defaultOptions[$name] )
                ? $defaultOptions[$name]
                : null;

            // If it validates, set it as the default
            if ( isset( $info['default'] ) ) {
                // Already set, no problem
                continue;
            } elseif ( !is_null( $prefFromUser ) && // Make sure we're not just pulling nothing
                    $field->validate( $prefFromUser, $user->getOptions() ) === true ) {
                $info['default'] = $prefFromUser;
            } elseif ( $field->validate( $globalDefault, $user->getOptions() ) === true ) {
                $info['default'] = $globalDefault;
            } else {
                throw new MWException( "Global default '$globalDefault' is invalid for field $name" );
            }
        }

        return $defaultPreferences;
    }

    static function getOptionFromUser( $name, $info, $user ) {
        $val = $user->getOption( $name );

        // Handling for multiselect preferences
        if ( ( isset( $info['type'] ) && $info['type'] == 'multiselect' ) ||
                ( isset( $info['class'] ) && $info['class'] == 'HTMLMultiSelectField' ) ) {
            $options = HTMLFormField::flattenOptions( $info['options'] );
            $prefix = isset( $info['prefix'] ) ? $info['prefix'] : $name;
            $val = [];

            foreach ( $options as $value ) {
                if ( $user->getOption( "$prefix$value" ) ) {
                    $val[] = $value;
                }
            }
        }

        // Handling for checkmatrix preferences
        if ( ( isset( $info['type'] ) && $info['type'] == 'checkmatrix' ) ||
                ( isset( $info['class'] ) && $info['class'] == 'HTMLCheckMatrix' ) ) {
            $columns = HTMLFormField::flattenOptions( $info['columns'] );
            $rows = HTMLFormField::flattenOptions( $info['rows'] );
            $prefix = isset( $info['prefix'] ) ? $info['prefix'] : $name;
            $val = [];

            foreach ( $columns as $column ) {
                foreach ( $rows as $row ) {
                    if ( $user->getOption( "$prefix$column-$row" ) ) {
                        $val[] = "$column-$row";
                    }
                }
            }
        }

        return $val;
    }

    static function profilePreferences( $user, IContextSource $context, &$defaultPreferences ) {
        global $wgAuth, $wgContLang, $wgParser, $wgDisableAuthManager;

        $config = $context->getConfig();
        // retrieving user name for GENDER and misc.
        $userName = $user->getName();

        # # User info #####################################
        // Information panel
        $defaultPreferences['username'] = [
            'type' => 'info',
            'label-message' => [ 'username', $userName ],
            'default' => $userName,
            'section' => 'personal/info',
        ];

        # Get groups to which the user belongs
        $userEffectiveGroups = $user->getEffectiveGroups();
        $userGroups = $userMembers = [];
        foreach ( $userEffectiveGroups as $ueg ) {
            if ( $ueg == '*' ) {
                // Skip the default * group, seems useless here
                continue;
            }
            $groupName = User::getGroupName( $ueg );
            $userGroups[] = User::makeGroupLinkHTML( $ueg, $groupName );

            $memberName = User::getGroupMember( $ueg, $userName );
            $userMembers[] = User::makeGroupLinkHTML( $ueg, $memberName );
        }
        asort( $userGroups );
        asort( $userMembers );

        $lang = $context->getLanguage();

        $defaultPreferences['usergroups'] = [
            'type' => 'info',
            'label' => $context->msg( 'prefs-memberingroups' )->numParams(
                count( $userGroups ) )->params( $userName )->parse(),
            'default' => $context->msg( 'prefs-memberingroups-type' )
                ->rawParams( $lang->commaList( $userGroups ), $lang->commaList( $userMembers ) )
                ->escaped(),
            'raw' => true,
            'section' => 'personal/info',
        ];

        $editCount = Linker::link( SpecialPage::getTitleFor( "Contributions", $userName ),
            $lang->formatNum( $user->getEditCount() ) );

        $defaultPreferences['editcount'] = [
            'type' => 'info',
            'raw' => true,
            'label-message' => 'prefs-edits',
            'default' => $editCount,
            'section' => 'personal/info',
        ];

        if ( $user->getRegistration() ) {
            $displayUser = $context->getUser();
            $userRegistration = $user->getRegistration();
            $defaultPreferences['registrationdate'] = [
                'type' => 'info',
                'label-message' => 'prefs-registration',
                'default' => $context->msg(
                    'prefs-registration-date-time',
                    $lang->userTimeAndDate( $userRegistration, $displayUser ),
                    $lang->userDate( $userRegistration, $displayUser ),
                    $lang->userTime( $userRegistration, $displayUser )
                )->parse(),
                'section' => 'personal/info',
            ];
        }

        $canViewPrivateInfo = $user->isAllowed( 'viewmyprivateinfo' );
        $canEditPrivateInfo = $user->isAllowed( 'editmyprivateinfo' );

        // Actually changeable stuff
        $realnameChangeAllowed = $wgDisableAuthManager ? $wgAuth->allowPropChange( 'realname' )
            : AuthManager::singleton()->allowsPropertyChange( 'realname' );
        $defaultPreferences['realname'] = [
            // (not really "private", but still shouldn't be edited without permission)
            'type' => $canEditPrivateInfo && $realnameChangeAllowed ? 'text' : 'info',
            'default' => $user->getRealName(),
            'section' => 'personal/info',
            'label-message' => 'yourrealname',
            'help-message' => 'prefs-help-realname',
        ];

        $allowPasswordChange = $wgDisableAuthManager ? $wgAuth->allowPasswordChange()
            : AuthManager::singleton()->allowsAuthenticationDataChange(
                new PasswordAuthenticationRequest(), false )->isGood();
        if ( $canEditPrivateInfo && $allowPasswordChange ) {
            $link = Linker::link( SpecialPage::getTitleFor( 'ChangePassword' ),
                $context->msg( 'prefs-resetpass' )->escaped(), [],
                [ 'returnto' => SpecialPage::getTitleFor( 'Preferences' )->getPrefixedText() ] );

            $defaultPreferences['password'] = [
                'type' => 'info',
                'raw' => true,
                'default' => $link,
                'label-message' => 'yourpassword',
                'section' => 'personal/info',
            ];
        }
        // Only show prefershttps if secure login is turned on
        if ( $config->get( 'SecureLogin' ) && wfCanIPUseHTTPS( $context->getRequest()->getIP() ) ) {
            $defaultPreferences['prefershttps'] = [
                'type' => 'toggle',
                'label-message' => 'tog-prefershttps',
                'help-message' => 'prefs-help-prefershttps',
                'section' => 'personal/info'
            ];
        }

        // Language
        $languages = Language::fetchLanguageNames( null, 'mw' );
        $languageCode = $config->get( 'LanguageCode' );
        if ( !array_key_exists( $languageCode, $languages ) ) {
            $languages[$languageCode] = $languageCode;
        }
        ksort( $languages );

        $options = [];
        foreach ( $languages as $code => $name ) {
            $display = wfBCP47( $code ) . ' - ' . $name;
            $options[$display] = $code;
        }
        $defaultPreferences['language'] = [
            'type' => 'select',
            'section' => 'personal/i18n',
            'options' => $options,
            'label-message' => 'yourlanguage',
        ];

        $defaultPreferences['gender'] = [
            'type' => 'radio',
            'section' => 'personal/i18n',
            'options' => [
                $context->msg( 'parentheses' )
                    ->params( $context->msg( 'gender-unknown' )->plain() )
                    ->escaped() => 'unknown',
                $context->msg( 'gender-female' )->escaped() => 'female',
                $context->msg( 'gender-male' )->escaped() => 'male',
            ],
            'label-message' => 'yourgender',
            'help-message' => 'prefs-help-gender',
        ];

        // see if there are multiple language variants to choose from
        if ( !$config->get( 'DisableLangConversion' ) ) {
            foreach ( LanguageConverter::$languagesWithVariants as $langCode ) {
                if ( $langCode == $wgContLang->getCode() ) {
                    $variants = $wgContLang->getVariants();

                    if ( count( $variants ) <= 1 ) {
                        continue;
                    }

                    $variantArray = [];
                    foreach ( $variants as $v ) {
                        $v = str_replace( '_', '-', strtolower( $v ) );
                        $variantArray[$v] = $lang->getVariantname( $v, false );
                    }

                    $options = [];
                    foreach ( $variantArray as $code => $name ) {
                        $display = wfBCP47( $code ) . ' - ' . $name;
                        $options[$display] = $code;
                    }

                    $defaultPreferences['variant'] = [
                        'label-message' => 'yourvariant',
                        'type' => 'select',
                        'options' => $options,
                        'section' => 'personal/i18n',
                        'help-message' => 'prefs-help-variant',
                    ];
                } else {
                    $defaultPreferences["variant-$langCode"] = [
                        'type' => 'api',
                    ];
                }
            }
        }

        // Stuff from Language::getExtraUserToggles()
        // FIXME is this dead code? $extraUserToggles doesn't seem to be defined for any language
        $toggles = $wgContLang->getExtraUserToggles();

        foreach ( $toggles as $toggle ) {
            $defaultPreferences[$toggle] = [
                'type' => 'toggle',
                'section' => 'personal/i18n',
                'label-message' => "tog-$toggle",
            ];
        }

        // show a preview of the old signature first
        $oldsigWikiText = $wgParser->preSaveTransform(
            '~~~',
            $context->getTitle(),
            $user,
            ParserOptions::newFromContext( $context )
        );
        $oldsigHTML = $context->getOutput()->parseInline( $oldsigWikiText, true, true );
        $defaultPreferences['oldsig'] = [
            'type' => 'info',
            'raw' => true,
            'label-message' => 'tog-oldsig',
            'default' => $oldsigHTML,
            'section' => 'personal/signature',
        ];
        $nicknameChangeAllowed = $wgDisableAuthManager ? $wgAuth->allowPropChange( 'nickname' )
            : AuthManager::singleton()->allowsPropertyChange( 'nickname' );
        $defaultPreferences['nickname'] = [
            'type' => $nicknameChangeAllowed ? 'text' : 'info',
            'maxlength' => $config->get( 'MaxSigChars' ),
            'label-message' => 'yournick',
            'validation-callback' => [ 'Preferences', 'validateSignature' ],
            'section' => 'personal/signature',
            'filter-callback' => [ 'Preferences', 'cleanSignature' ],
        ];
        $defaultPreferences['fancysig'] = [
            'type' => 'toggle',
            'label-message' => 'tog-fancysig',
            // show general help about signature at the bottom of the section
            'help-message' => 'prefs-help-signature',
            'section' => 'personal/signature'
        ];

        # # Email stuff

        if ( $config->get( 'EnableEmail' ) ) {
            if ( $canViewPrivateInfo ) {
                $helpMessages[] = $config->get( 'EmailConfirmToEdit' )
                        ? 'prefs-help-email-required'
                        : 'prefs-help-email';

                if ( $config->get( 'EnableUserEmail' ) ) {
                    // additional messages when users can send email to each other
                    $helpMessages[] = 'prefs-help-email-others';
                }

                $emailAddress = $user->getEmail() ? htmlspecialchars( $user->getEmail() ) : '';
                $emailChangeAllowed = $wgDisableAuthManager ? $wgAuth->allowPropChange( 'emailaddress' )
                    : AuthManager::singleton()->allowsPropertyChange( 'emailaddress' );
                if ( $canEditPrivateInfo && $emailChangeAllowed ) {
                    $link = Linker::link(
                        SpecialPage::getTitleFor( 'ChangeEmail' ),
                        $context->msg( $user->getEmail() ? 'prefs-changeemail' : 'prefs-setemail' )->escaped(),
                        [],
                        [ 'returnto' => SpecialPage::getTitleFor( 'Preferences' )->getPrefixedText() ] );

                    $emailAddress .= $emailAddress == '' ? $link : (
                        $context->msg( 'word-separator' )->escaped()
                        . $context->msg( 'parentheses' )->rawParams( $link )->escaped()
                    );
                }

                $defaultPreferences['emailaddress'] = [
                    'type' => 'info',
                    'raw' => true,
                    'default' => $emailAddress,
                    'label-message' => 'youremail',
                    'section' => 'personal/email',
                    'help-messages' => $helpMessages,
                    # 'cssclass' chosen below
                ];
            }

            $disableEmailPrefs = false;

            if ( $config->get( 'EmailAuthentication' ) ) {
                $emailauthenticationclass = 'mw-email-not-authenticated';
                if ( $user->getEmail() ) {
                    if ( $user->getEmailAuthenticationTimestamp() ) {
                        // date and time are separate parameters to facilitate localisation.
                        // $time is kept for backward compat reasons.
                        // 'emailauthenticated' is also used in SpecialConfirmemail.php
                        $displayUser = $context->getUser();
                        $emailTimestamp = $user->getEmailAuthenticationTimestamp();
                        $time = $lang->userTimeAndDate( $emailTimestamp, $displayUser );
                        $d = $lang->userDate( $emailTimestamp, $displayUser );
                        $t = $lang->userTime( $emailTimestamp, $displayUser );
                        $emailauthenticated = $context->msg( 'emailauthenticated',
                            $time, $d, $t )->parse() . '<br />';
                        $disableEmailPrefs = false;
                        $emailauthenticationclass = 'mw-email-authenticated';
                    } else {
                        $disableEmailPrefs = true;
                        $emailauthenticated = $context->msg( 'emailnotauthenticated' )->parse() . '<br />' .
                            Linker::linkKnown(
                                SpecialPage::getTitleFor( 'Confirmemail' ),
                                $context->msg( 'emailconfirmlink' )->escaped()
                            ) . '<br />';
                        $emailauthenticationclass = "mw-email-not-authenticated";
                    }
                } else {
                    $disableEmailPrefs = true;
                    $emailauthenticated = $context->msg( 'noemailprefs' )->escaped();
                    $emailauthenticationclass = 'mw-email-none';
                }

                if ( $canViewPrivateInfo ) {
                    $defaultPreferences['emailauthentication'] = [
                        'type' => 'info',
                        'raw' => true,
                        'section' => 'personal/email',
                        'label-message' => 'prefs-emailconfirm-label',
                        'default' => $emailauthenticated,
                        # Apply the same CSS class used on the input to the message:
                        'cssclass' => $emailauthenticationclass,
                    ];
                }
            }

            if ( $config->get( 'EnableUserEmail' ) && $user->isAllowed( 'sendemail' ) ) {
                $defaultPreferences['disablemail'] = [
                    'type' => 'toggle',
                    'invert' => true,
                    'section' => 'personal/email',
                    'label-message' => 'allowemail',
                    'disabled' => $disableEmailPrefs,
                ];
                $defaultPreferences['ccmeonemails'] = [
                    'type' => 'toggle',
                    'section' => 'personal/email',
                    'label-message' => 'tog-ccmeonemails',
                    'disabled' => $disableEmailPrefs,
                ];
            }

            if ( $config->get( 'EnotifWatchlist' ) ) {
                $defaultPreferences['enotifwatchlistpages'] = [
                    'type' => 'toggle',
                    'section' => 'personal/email',
                    'label-message' => 'tog-enotifwatchlistpages',
                    'disabled' => $disableEmailPrefs,
                ];
            }
            if ( $config->get( 'EnotifUserTalk' ) ) {
                $defaultPreferences['enotifusertalkpages'] = [
                    'type' => 'toggle',
                    'section' => 'personal/email',
                    'label-message' => 'tog-enotifusertalkpages',
                    'disabled' => $disableEmailPrefs,
                ];
            }
            if ( $config->get( 'EnotifUserTalk' ) || $config->get( 'EnotifWatchlist' ) ) {
                if ( $config->get( 'EnotifMinorEdits' ) ) {
                    $defaultPreferences['enotifminoredits'] = [
                        'type' => 'toggle',
                        'section' => 'personal/email',
                        'label-message' => 'tog-enotifminoredits',
                        'disabled' => $disableEmailPrefs,
                    ];
                }

                if ( $config->get( 'EnotifRevealEditorAddress' ) ) {
                    $defaultPreferences['enotifrevealaddr'] = [
                        'type' => 'toggle',
                        'section' => 'personal/email',
                        'label-message' => 'tog-enotifrevealaddr',
                        'disabled' => $disableEmailPrefs,
                    ];
                }
            }
        }
    }

    static function skinPreferences( $user, IContextSource $context, &$defaultPreferences ) {
        # # Skin #####################################

        // Skin selector, if there is at least one valid skin
        $skinOptions = self::generateSkinOptions( $user, $context );
        if ( $skinOptions ) {
            $defaultPreferences['skin'] = [
                'type' => 'radio',
                'options' => $skinOptions,
                'label' => '&#160;',
                'section' => 'rendering/skin',
            ];
        }

        $config = $context->getConfig();
        $allowUserCss = $config->get( 'AllowUserCss' );
        $allowUserJs = $config->get( 'AllowUserJs' );
        # Create links to user CSS/JS pages for all skins
        # This code is basically copied from generateSkinOptions().  It'd
        # be nice to somehow merge this back in there to avoid redundancy.
        if ( $allowUserCss || $allowUserJs ) {
            $linkTools = [];
            $userName = $user->getName();

            if ( $allowUserCss ) {
                $cssPage = Title::makeTitleSafe( NS_USER, $userName . '/common.css' );
                $linkTools[] = Linker::link( $cssPage, $context->msg( 'prefs-custom-css' )->escaped() );
            }

            if ( $allowUserJs ) {
                $jsPage = Title::makeTitleSafe( NS_USER, $userName . '/common.js' );
                $linkTools[] = Linker::link( $jsPage, $context->msg( 'prefs-custom-js' )->escaped() );
            }

            $defaultPreferences['commoncssjs'] = [
                'type' => 'info',
                'raw' => true,
                'default' => $context->getLanguage()->pipeList( $linkTools ),
                'label-message' => 'prefs-common-css-js',
                'section' => 'rendering/skin',
            ];
        }
    }

    static function filesPreferences( $user, IContextSource $context, &$defaultPreferences ) {
        # # Files #####################################
        $defaultPreferences['imagesize'] = [
            'type' => 'select',
            'options' => self::getImageSizes( $context ),
            'label-message' => 'imagemaxsize',
            'section' => 'rendering/files',
        ];
        $defaultPreferences['thumbsize'] = [
            'type' => 'select',
            'options' => self::getThumbSizes( $context ),
            'label-message' => 'thumbsize',
            'section' => 'rendering/files',
        ];
    }

    static function datetimePreferences( $user, IContextSource $context, &$defaultPreferences ) {
        # # Date and time #####################################
        $dateOptions = self::getDateOptions( $context );
        if ( $dateOptions ) {
            $defaultPreferences['date'] = [
                'type' => 'radio',
                'options' => $dateOptions,
                'label' => '&#160;',
                'section' => 'rendering/dateformat',
            ];
        }

        // Info
        $now = wfTimestampNow();
        $lang = $context->getLanguage();
        $nowlocal = Xml::element( 'span', [ 'id' => 'wpLocalTime' ],
            $lang->userTime( $now, $user ) );
        $nowserver = $lang->userTime( $now, $user,
                [ 'format' => false, 'timecorrection' => false ] ) .
            Html::hidden( 'wpServerTime', (int)substr( $now, 8, 2 ) * 60 + (int)substr( $now, 10, 2 ) );

        $defaultPreferences['nowserver'] = [
            'type' => 'info',
            'raw' => 1,
            'label-message' => 'servertime',
            'default' => $nowserver,
            'section' => 'rendering/timeoffset',
        ];

        $defaultPreferences['nowlocal'] = [
            'type' => 'info',
            'raw' => 1,
            'label-message' => 'localtime',
            'default' => $nowlocal,
            'section' => 'rendering/timeoffset',
        ];

        // Grab existing pref.
        $tzOffset = $user->getOption( 'timecorrection' );
        $tz = explode( '|', $tzOffset, 3 );

        $tzOptions = self::getTimezoneOptions( $context );

        $tzSetting = $tzOffset;
        if ( count( $tz ) > 1 && $tz[0] == 'Offset' ) {
            $minDiff = $tz[1];
            $tzSetting = sprintf( '%+03d:%02d', floor( $minDiff / 60 ), abs( $minDiff ) % 60 );
        } elseif ( count( $tz ) > 1 && $tz[0] == 'ZoneInfo' &&
            !in_array( $tzOffset, HTMLFormField::flattenOptions( $tzOptions ) )
        ) {
            # Timezone offset can vary with DST
            $userTZ = timezone_open( $tz[2] );
            if ( $userTZ !== false ) {
                $minDiff = floor( timezone_offset_get( $userTZ, date_create( 'now' ) ) / 60 );
                $tzSetting = "ZoneInfo|$minDiff|{$tz[2]}";
            }
        }

        $defaultPreferences['timecorrection'] = [
            'class' => 'HTMLSelectOrOtherField',
            'label-message' => 'timezonelegend',
            'options' => $tzOptions,
            'default' => $tzSetting,
            'size' => 20,
            'section' => 'rendering/timeoffset',
        ];
    }

    static function renderingPreferences( $user, IContextSource $context, &$defaultPreferences ) {
        # # Diffs ####################################
        $defaultPreferences['diffonly'] = [
            'type' => 'toggle',
            'section' => 'rendering/diffs',
            'label-message' => 'tog-diffonly',
        ];
        $defaultPreferences['norollbackdiff'] = [
            'type' => 'toggle',
            'section' => 'rendering/diffs',
            'label-message' => 'tog-norollbackdiff',
        ];

        # # Page Rendering ##############################
        if ( $context->getConfig()->get( 'AllowUserCssPrefs' ) ) {
            $defaultPreferences['underline'] = [
                'type' => 'select',
                'options' => [
                    $context->msg( 'underline-never' )->text() => 0,
                    $context->msg( 'underline-always' )->text() => 1,
                    $context->msg( 'underline-default' )->text() => 2,
                ],
                'label-message' => 'tog-underline',
                'section' => 'rendering/advancedrendering',
            ];
        }

        $stubThresholdValues = [ 50, 100, 500, 1000, 2000, 5000, 10000 ];
        $stubThresholdOptions = [ $context->msg( 'stub-threshold-disabled' )->text() => 0 ];
        foreach ( $stubThresholdValues as $value ) {
            $stubThresholdOptions[$context->msg( 'size-bytes', $value )->text()] = $value;
        }

        $defaultPreferences['stubthreshold'] = [
            'type' => 'select',
            'section' => 'rendering/advancedrendering',
            'options' => $stubThresholdOptions,
            // This is not a raw HTML message; label-raw is needed for the manual <a></a>
            'label-raw' => $context->msg( 'stub-threshold' )->rawParams(
                '<a href="#" class="stub">' .
                $context->msg( 'stub-threshold-sample-link' )->parse() .
                '</a>' )->parse(),
        ];

        $defaultPreferences['showhiddencats'] = [
            'type' => 'toggle',
            'section' => 'rendering/advancedrendering',
            'label-message' => 'tog-showhiddencats'
        ];

        $defaultPreferences['numberheadings'] = [
            'type' => 'toggle',
            'section' => 'rendering/advancedrendering',
            'label-message' => 'tog-numberheadings',
        ];
    }

    static function editingPreferences( $user, IContextSource $context, &$defaultPreferences ) {
        # # Editing #####################################
        $defaultPreferences['editsectiononrightclick'] = [
            'type' => 'toggle',
            'section' => 'editing/advancedediting',
            'label-message' => 'tog-editsectiononrightclick',
        ];
        $defaultPreferences['editondblclick'] = [
            'type' => 'toggle',
            'section' => 'editing/advancedediting',
            'label-message' => 'tog-editondblclick',
        ];

        if ( $context->getConfig()->get( 'AllowUserCssPrefs' ) ) {
            $defaultPreferences['editfont'] = [
                'type' => 'select',
                'section' => 'editing/editor',
                'label-message' => 'editfont-style',
                'options' => [
                    $context->msg( 'editfont-default' )->text() => 'default',
                    $context->msg( 'editfont-monospace' )->text() => 'monospace',
                    $context->msg( 'editfont-sansserif' )->text() => 'sans-serif',
                    $context->msg( 'editfont-serif' )->text() => 'serif',
                ]
            ];
        }
        $defaultPreferences['cols'] = [
            'type' => 'int',
            'label-message' => 'columns',
            'section' => 'editing/editor',
            'min' => 4,
            'max' => 1000,
        ];
        $defaultPreferences['rows'] = [
            'type' => 'int',
            'label-message' => 'rows',
            'section' => 'editing/editor',
            'min' => 4,
            'max' => 1000,
        ];
        if ( $user->isAllowed( 'minoredit' ) ) {
            $defaultPreferences['minordefault'] = [
                'type' => 'toggle',
                'section' => 'editing/editor',
                'label-message' => 'tog-minordefault',
            ];
        }
        $defaultPreferences['forceeditsummary'] = [
            'type' => 'toggle',
            'section' => 'editing/editor',
            'label-message' => 'tog-forceeditsummary',
        ];
        $defaultPreferences['useeditwarning'] = [
            'type' => 'toggle',
            'section' => 'editing/editor',
            'label-message' => 'tog-useeditwarning',
        ];
        $defaultPreferences['showtoolbar'] = [
            'type' => 'toggle',
            'section' => 'editing/editor',
            'label-message' => 'tog-showtoolbar',
        ];

        $defaultPreferences['previewonfirst'] = [
            'type' => 'toggle',
            'section' => 'editing/preview',
            'label-message' => 'tog-previewonfirst',
        ];
        $defaultPreferences['previewontop'] = [
            'type' => 'toggle',
            'section' => 'editing/preview',
            'label-message' => 'tog-previewontop',
        ];
        $defaultPreferences['uselivepreview'] = [
            'type' => 'toggle',
            'section' => 'editing/preview',
            'label-message' => 'tog-uselivepreview',
        ];

    }

    static function rcPreferences( $user, IContextSource $context, &$defaultPreferences ) {
        $config = $context->getConfig();
        $rcMaxAge = $config->get( 'RCMaxAge' );
        # # RecentChanges #####################################
        $defaultPreferences['rcdays'] = [
            'type' => 'float',
            'label-message' => 'recentchangesdays',
            'section' => 'rc/displayrc',
            'min' => 1,
            'max' => ceil( $rcMaxAge / ( 3600 * 24 ) ),
            'help' => $context->msg( 'recentchangesdays-max' )->numParams(
                ceil( $rcMaxAge / ( 3600 * 24 ) ) )->escaped()
        ];
        $defaultPreferences['rclimit'] = [
            'type' => 'int',
            'label-message' => 'recentchangescount',
            'help-message' => 'prefs-help-recentchangescount',
            'section' => 'rc/displayrc',
        ];
        $defaultPreferences['usenewrc'] = [
            'type' => 'toggle',
            'label-message' => 'tog-usenewrc',
            'section' => 'rc/advancedrc',
        ];
        $defaultPreferences['hideminor'] = [
            'type' => 'toggle',
            'label-message' => 'tog-hideminor',
            'section' => 'rc/advancedrc',
        ];

        if ( $config->get( 'RCWatchCategoryMembership' ) ) {
            $defaultPreferences['hidecategorization'] = [
                'type' => 'toggle',
                'label-message' => 'tog-hidecategorization',
                'section' => 'rc/advancedrc',
            ];
        }

        if ( $user->useRCPatrol() ) {
            $defaultPreferences['hidepatrolled'] = [
                'type' => 'toggle',
                'section' => 'rc/advancedrc',
                'label-message' => 'tog-hidepatrolled',
            ];
        }

        if ( $user->useNPPatrol() ) {
            $defaultPreferences['newpageshidepatrolled'] = [
                'type' => 'toggle',
                'section' => 'rc/advancedrc',
                'label-message' => 'tog-newpageshidepatrolled',
            ];
        }

        if ( $config->get( 'RCShowWatchingUsers' ) ) {
            $defaultPreferences['shownumberswatching'] = [
                'type' => 'toggle',
                'section' => 'rc/advancedrc',
                'label-message' => 'tog-shownumberswatching',
            ];
        }
    }

    static function watchlistPreferences( $user, IContextSource $context, &$defaultPreferences ) {
        $config = $context->getConfig();
        $watchlistdaysMax = ceil( $config->get( 'RCMaxAge' ) / ( 3600 * 24 ) );

        # # Watchlist #####################################
        if ( $user->isAllowed( 'editmywatchlist' ) ) {
            $editWatchlistLinks = [];
            $editWatchlistModes = [
                'edit' => [ 'EditWatchlist', false ],
                'raw' => [ 'EditWatchlist', 'raw' ],
                'clear' => [ 'EditWatchlist', 'clear' ],
            ];
            foreach ( $editWatchlistModes as $editWatchlistMode => $mode ) {
                // Messages: prefs-editwatchlist-edit, prefs-editwatchlist-raw, prefs-editwatchlist-clear
                $editWatchlistLinks[] = Linker::linkKnown(
                    SpecialPage::getTitleFor( $mode[0], $mode[1] ),
                    $context->msg( "prefs-editwatchlist-{$editWatchlistMode}" )->parse()
                );
            }

            $defaultPreferences['editwatchlist'] = [
                'type' => 'info',
                'raw' => true,
                'default' => $context->getLanguage()->pipeList( $editWatchlistLinks ),
                'label-message' => 'prefs-editwatchlist-label',
                'section' => 'watchlist/editwatchlist',
            ];
        }

        $defaultPreferences['watchlistdays'] = [
            'type' => 'float',
            'min' => 0,
            'max' => $watchlistdaysMax,
            'section' => 'watchlist/displaywatchlist',
            'help' => $context->msg( 'prefs-watchlist-days-max' )->numParams(
                $watchlistdaysMax )->escaped(),
            'label-message' => 'prefs-watchlist-days',
        ];
        $defaultPreferences['wllimit'] = [
            'type' => 'int',
            'min' => 0,
            'max' => 1000,
            'label-message' => 'prefs-watchlist-edits',
            'help' => $context->msg( 'prefs-watchlist-edits-max' )->escaped(),
            'section' => 'watchlist/displaywatchlist',
        ];
        $defaultPreferences['extendwatchlist'] = [
            'type' => 'toggle',
            'section' => 'watchlist/advancedwatchlist',
            'label-message' => 'tog-extendwatchlist',
        ];
        $defaultPreferences['watchlisthideminor'] = [
            'type' => 'toggle',
            'section' => 'watchlist/advancedwatchlist',
            'label-message' => 'tog-watchlisthideminor',
        ];
        $defaultPreferences['watchlisthidebots'] = [
            'type' => 'toggle',
            'section' => 'watchlist/advancedwatchlist',
            'label-message' => 'tog-watchlisthidebots',
        ];
        $defaultPreferences['watchlisthideown'] = [
            'type' => 'toggle',
            'section' => 'watchlist/advancedwatchlist',
            'label-message' => 'tog-watchlisthideown',
        ];
        $defaultPreferences['watchlisthideanons'] = [
            'type' => 'toggle',
            'section' => 'watchlist/advancedwatchlist',
            'label-message' => 'tog-watchlisthideanons',
        ];
        $defaultPreferences['watchlisthideliu'] = [
            'type' => 'toggle',
            'section' => 'watchlist/advancedwatchlist',
            'label-message' => 'tog-watchlisthideliu',
        ];
        $defaultPreferences['watchlistreloadautomatically'] = [
            'type' => 'toggle',
            'section' => 'watchlist/advancedwatchlist',
            'label-message' => 'tog-watchlistreloadautomatically',
        ];

        if ( $config->get( 'RCWatchCategoryMembership' ) ) {
            $defaultPreferences['watchlisthidecategorization'] = [
                'type' => 'toggle',
                'section' => 'watchlist/advancedwatchlist',
                'label-message' => 'tog-watchlisthidecategorization',
            ];
        }

        if ( $user->useRCPatrol() ) {
            $defaultPreferences['watchlisthidepatrolled'] = [
                'type' => 'toggle',
                'section' => 'watchlist/advancedwatchlist',
                'label-message' => 'tog-watchlisthidepatrolled',
            ];
        }

        $watchTypes = [
            'edit' => 'watchdefault',
            'move' => 'watchmoves',
            'delete' => 'watchdeletion'
        ];

        // Kinda hacky
        if ( $user->isAllowed( 'createpage' ) || $user->isAllowed( 'createtalk' ) ) {
            $watchTypes['read'] = 'watchcreations';
        }

        if ( $user->isAllowed( 'rollback' ) ) {
            $watchTypes['rollback'] = 'watchrollback';
        }

        if ( $user->isAllowed( 'upload' ) ) {
            $watchTypes['upload'] = 'watchuploads';
        }

        foreach ( $watchTypes as $action => $pref ) {
            if ( $user->isAllowed( $action ) ) {
                // Messages:
                // tog-watchdefault, tog-watchmoves, tog-watchdeletion, tog-watchcreations, tog-watchuploads
                // tog-watchrollback
                $defaultPreferences[$pref] = [
                    'type' => 'toggle',
                    'section' => 'watchlist/advancedwatchlist',
                    'label-message' => "tog-$pref",
                ];
            }
        }

        if ( $config->get( 'EnableAPI' ) ) {
            $defaultPreferences['watchlisttoken'] = [
                'type' => 'api',
            ];
            $defaultPreferences['watchlisttoken-info'] = [
                'type' => 'info',
                'section' => 'watchlist/tokenwatchlist',
                'label-message' => 'prefs-watchlist-token',
                'default' => $user->getTokenFromOption( 'watchlisttoken' ),
                'help-message' => 'prefs-help-watchlist-token2',
            ];
        }
    }

    static function searchPreferences( $user, IContextSource $context, &$defaultPreferences ) {
        foreach ( MWNamespace::getValidNamespaces() as $n ) {
            $defaultPreferences['searchNs' . $n] = [
                'type' => 'api',
            ];
        }
    }

    static function miscPreferences( $user, IContextSource $context, &$defaultPreferences ) {
    }

    static function generateSkinOptions( $user, IContextSource $context ) {
        $ret = [];

        $mptitle = Title::newMainPage();
        $previewtext = $context->msg( 'skin-preview' )->escaped();

        # Only show skins that aren't disabled in $wgSkipSkins
        $validSkinNames = Skin::getAllowedSkins();

        # Sort by UI skin name. First though need to update validSkinNames as sometimes
        # the skinkey & UI skinname differ (e.g. "standard" skinkey is "Classic" in the UI).
        foreach ( $validSkinNames as $skinkey => &$skinname ) {
            $msg = $context->msg( "skinname-{$skinkey}" );
            if ( $msg->exists() ) {
                $skinname = htmlspecialchars( $msg->text() );
            }
        }
        asort( $validSkinNames );

        $config = $context->getConfig();
        $defaultSkin = $config->get( 'DefaultSkin' );
        $allowUserCss = $config->get( 'AllowUserCss' );
        $allowUserJs = $config->get( 'AllowUserJs' );

        $foundDefault = false;
        foreach ( $validSkinNames as $skinkey => $sn ) {
            $linkTools = [];

            # Mark the default skin
            if ( strcasecmp( $skinkey, $defaultSkin ) === 0 ) {
                $linkTools[] = $context->msg( 'default' )->escaped();
                $foundDefault = true;
            }

            # Create preview link
            $mplink = htmlspecialchars( $mptitle->getLocalURL( [ 'useskin' => $skinkey ] ) );
            $linkTools[] = "<a target='_blank' href=\"$mplink\">$previewtext</a>";

            # Create links to user CSS/JS pages
            if ( $allowUserCss ) {
                $cssPage = Title::makeTitleSafe( NS_USER, $user->getName() . '/' . $skinkey . '.css' );
                $linkTools[] = Linker::link( $cssPage, $context->msg( 'prefs-custom-css' )->escaped() );
            }

            if ( $allowUserJs ) {
                $jsPage = Title::makeTitleSafe( NS_USER, $user->getName() . '/' . $skinkey . '.js' );
                $linkTools[] = Linker::link( $jsPage, $context->msg( 'prefs-custom-js' )->escaped() );
            }

            $display = $sn . ' ' . $context->msg( 'parentheses' )
                ->rawParams( $context->getLanguage()->pipeList( $linkTools ) )
                ->escaped();
            $ret[$display] = $skinkey;
        }

        if ( !$foundDefault ) {
            // If the default skin is not available, things are going to break horribly because the
            // default value for skin selector will not be a valid value. Let's just not show it then.
            return [];
        }

        return $ret;
    }

    static function getDateOptions( IContextSource $context ) {
        $lang = $context->getLanguage();
        $dateopts = $lang->getDatePreferences();

        $ret = [];

        if ( $dateopts ) {
            if ( !in_array( 'default', $dateopts ) ) {
                $dateopts[] = 'default'; // Make sure default is always valid
                                        // Bug 19237
            }

            // FIXME KLUGE: site default might not be valid for user language
            global $wgDefaultUserOptions;
            if ( !in_array( $wgDefaultUserOptions['date'], $dateopts ) ) {
                $wgDefaultUserOptions['date'] = 'default';
            }

            $epoch = wfTimestampNow();
            foreach ( $dateopts as $key ) {
                if ( $key == 'default' ) {
                    $formatted = $context->msg( 'datedefault' )->escaped();
                } else {
                    $formatted = htmlspecialchars( $lang->timeanddate( $epoch, false, $key ) );
                }
                $ret[$formatted] = $key;
            }
        }
        return $ret;
    }

    static function getImageSizes( IContextSource $context ) {
        $ret = [];
        $pixels = $context->msg( 'unit-pixel' )->text();

        foreach ( $context->getConfig()->get( 'ImageLimits' ) as $index => $limits ) {
            $display = "{$limits[0]}×{$limits[1]}" . $pixels;
            $ret[$display] = $index;
        }

        return $ret;
    }

    static function getThumbSizes( IContextSource $context ) {
        $ret = [];
        $pixels = $context->msg( 'unit-pixel' )->text();

        foreach ( $context->getConfig()->get( 'ThumbLimits' ) as $index => $size ) {
            $display = $size . $pixels;
            $ret[$display] = $index;
        }

        return $ret;
    }

    static function validateSignature( $signature, $alldata, $form ) {
        global $wgParser;
        $maxSigChars = $form->getConfig()->get( 'MaxSigChars' );
        if ( mb_strlen( $signature ) > $maxSigChars ) {
            return Xml::element( 'span', [ 'class' => 'error' ],
                $form->msg( 'badsiglength' )->numParams( $maxSigChars )->text() );
        } elseif ( isset( $alldata['fancysig'] ) &&
                $alldata['fancysig'] &&
                $wgParser->validateSig( $signature ) === false
        ) {
            return Xml::element(
                'span',
                [ 'class' => 'error' ],
                $form->msg( 'badsig' )->text()
            );
        } else {
            return true;
        }
    }

    static function cleanSignature( $signature, $alldata, $form ) {
        if ( isset( $alldata['fancysig'] ) && $alldata['fancysig'] ) {
            global $wgParser;
            $signature = $wgParser->cleanSig( $signature );
        } else {
            // When no fancy sig used, make sure ~{3,5} get removed.
            $signature = Parser::cleanSigInSig( $signature );
        }

        return $signature;
    }

    static function getFormObject(
        $user,
        IContextSource $context,
        $formClass = 'PreferencesForm',
        array $remove = []
    ) {
        $formDescriptor = Preferences::getPreferences( $user, $context );
        if ( count( $remove ) ) {
            $removeKeys = array_flip( $remove );
            $formDescriptor = array_diff_key( $formDescriptor, $removeKeys );
        }

        // Remove type=api preferences. They are not intended for rendering in the form.
        foreach ( $formDescriptor as $name => $info ) {
            if ( isset( $info['type'] ) && $info['type'] === 'api' ) {
                unset( $formDescriptor[$name] );
            }
        }

        $htmlForm = new $formClass( $formDescriptor, $context, 'prefs' );

        $htmlForm->setModifiedUser( $user );
        $htmlForm->setId( 'mw-prefs-form' );
        $htmlForm->setAutocomplete( 'off' );
        $htmlForm->setSubmitText( $context->msg( 'saveprefs' )->text() );
        # Used message keys: 'accesskey-preferences-save', 'tooltip-preferences-save'
        $htmlForm->setSubmitTooltip( 'preferences-save' );
        $htmlForm->setSubmitID( 'prefsubmit' );
        $htmlForm->setSubmitCallback( [ 'Preferences', 'tryFormSubmit' ] );

        return $htmlForm;
    }

    static function getTimezoneOptions( IContextSource $context ) {
        $opt = [];

        $localTZoffset = $context->getConfig()->get( 'LocalTZoffset' );
        $timeZoneList = self::getTimeZoneList( $context->getLanguage() );

        $timestamp = MWTimestamp::getLocalInstance();
        // Check that the LocalTZoffset is the same as the local time zone offset
        if ( $localTZoffset == $timestamp->format( 'Z' ) / 60 ) {
            $timezoneName = $timestamp->getTimezone()->getName();
            // Localize timezone
            if ( isset( $timeZoneList[$timezoneName] ) ) {
                $timezoneName = $timeZoneList[$timezoneName]['name'];
            }
            $server_tz_msg = $context->msg(
                'timezoneuseserverdefault',
                $timezoneName
            )->text();
        } else {
            $tzstring = sprintf(
                '%+03d:%02d',
                floor( $localTZoffset / 60 ),
                abs( $localTZoffset ) % 60
            );
            $server_tz_msg = $context->msg( 'timezoneuseserverdefault', $tzstring )->text();
        }
        $opt[$server_tz_msg] = "System|$localTZoffset";
        $opt[$context->msg( 'timezoneuseoffset' )->text()] = 'other';
        $opt[$context->msg( 'guesstimezone' )->text()] = 'guess';

        foreach ( $timeZoneList as $timeZoneInfo ) {
            $region = $timeZoneInfo['region'];
            if ( !isset( $opt[$region] ) ) {
                $opt[$region] = [];
            }
            $opt[$region][$timeZoneInfo['name']] = $timeZoneInfo['timecorrection'];
        }
        return $opt;
    }

    static function filterIntval( $value, $alldata ) {
        return intval( $value );
    }

    static function filterTimezoneInput( $tz, $alldata ) {
        $data = explode( '|', $tz, 3 );
        switch ( $data[0] ) {
            case 'ZoneInfo':
            case 'System':
                return $tz;
            default:
                $data = explode( ':', $tz, 2 );
                if ( count( $data ) == 2 ) {
                    $data[0] = intval( $data[0] );
                    $data[1] = intval( $data[1] );
                    $minDiff = abs( $data[0] ) * 60 + $data[1];
                    if ( $data[0] < 0 ) {
                        $minDiff = - $minDiff;
                    }
                } else {
                    $minDiff = intval( $data[0] ) * 60;
                }

                # Max is +14:00 and min is -12:00, see:
                # https://en.wikipedia.org/wiki/Timezone
                $minDiff = min( $minDiff, 840 );  # 14:00
                $minDiff = max( $minDiff, - 720 ); # -12:00
                return 'Offset|' . $minDiff;
        }
    }

    static function tryFormSubmit( $formData, $form ) {
        $user = $form->getModifiedUser();
        $hiddenPrefs = $form->getConfig()->get( 'HiddenPrefs' );
        $result = true;

        if ( !$user->isAllowedAny( 'editmyprivateinfo', 'editmyoptions' ) ) {
            return Status::newFatal( 'mypreferencesprotected' );
        }

        // Filter input
        foreach ( array_keys( $formData ) as $name ) {
            if ( isset( self::$saveFilters[$name] ) ) {
                $formData[$name] =
                    call_user_func( self::$saveFilters[$name], $formData[$name], $formData );
            }
        }

        // Fortunately, the realname field is MUCH simpler
        // (not really "private", but still shouldn't be edited without permission)

        if ( !in_array( 'realname', $hiddenPrefs )
            && $user->isAllowed( 'editmyprivateinfo' )
            && array_key_exists( 'realname', $formData )
        ) {
            $realName = $formData['realname'];
            $user->setRealName( $realName );
        }

        if ( $user->isAllowed( 'editmyoptions' ) ) {
            foreach ( self::$saveBlacklist as $b ) {
                unset( $formData[$b] );
            }

            # If users have saved a value for a preference which has subsequently been disabled
            # via $wgHiddenPrefs, we don't want to destroy that setting in case the preference
            # is subsequently re-enabled
            foreach ( $hiddenPrefs as $pref ) {
                # If the user has not set a non-default value here, the default will be returned
                # and subsequently discarded
                $formData[$pref] = $user->getOption( $pref, null, true );
            }

            // Keep old preferences from interfering due to back-compat code, etc.
            $user->resetOptions( 'unused', $form->getContext() );

            foreach ( $formData as $key => $value ) {
                $user->setOption( $key, $value );
            }

            Hooks::run( 'PreferencesFormPreSave', [ $formData, $form, $user, &$result ] );
        }

        MediaWiki\Auth\AuthManager::callLegacyAuthPlugin( 'updateExternalDB', [ $user ] );
        $user->saveSettings();

        return $result;
    }

    public static function tryUISubmit( $formData, $form ) {
        $res = self::tryFormSubmit( $formData, $form );

        if ( $res ) {
            $urlOptions = [];

            if ( $res === 'eauth' ) {
                $urlOptions['eauth'] = 1;
            }

            $urlOptions += $form->getExtraSuccessRedirectParameters();

            $url = $form->getTitle()->getFullURL( $urlOptions );

            $context = $form->getContext();
            // Set session data for the success message
            $context->getRequest()->setSessionData( 'specialPreferencesSaveSuccess', 1 );

            $context->getOutput()->redirect( $url );
        }

        return Status::newGood();
    }

    public static function getTimeZoneList( Language $language ) {
        $identifiers = DateTimeZone::listIdentifiers();
        if ( $identifiers === false ) {
            return [];
        }
        sort( $identifiers );

        $tzRegions = [
            'Africa' => wfMessage( 'timezoneregion-africa' )->inLanguage( $language )->text(),
            'America' => wfMessage( 'timezoneregion-america' )->inLanguage( $language )->text(),
            'Antarctica' => wfMessage( 'timezoneregion-antarctica' )->inLanguage( $language )->text(),
            'Arctic' => wfMessage( 'timezoneregion-arctic' )->inLanguage( $language )->text(),
            'Asia' => wfMessage( 'timezoneregion-asia' )->inLanguage( $language )->text(),
            'Atlantic' => wfMessage( 'timezoneregion-atlantic' )->inLanguage( $language )->text(),
            'Australia' => wfMessage( 'timezoneregion-australia' )->inLanguage( $language )->text(),
            'Europe' => wfMessage( 'timezoneregion-europe' )->inLanguage( $language )->text(),
            'Indian' => wfMessage( 'timezoneregion-indian' )->inLanguage( $language )->text(),
            'Pacific' => wfMessage( 'timezoneregion-pacific' )->inLanguage( $language )->text(),
        ];
        asort( $tzRegions );

        $timeZoneList = [];

        $now = new DateTime();

        foreach ( $identifiers as $identifier ) {
            $parts = explode( '/', $identifier, 2 );

            // DateTimeZone::listIdentifiers() returns a number of
            // backwards-compatibility entries. This filters them out of the
            // list presented to the user.
            if ( count( $parts ) !== 2 || !array_key_exists( $parts[0], $tzRegions ) ) {
                continue;
            }

            // Localize region
            $parts[0] = $tzRegions[$parts[0]];

            $dateTimeZone = new DateTimeZone( $identifier );
            $minDiff = floor( $dateTimeZone->getOffset( $now ) / 60 );

            $display = str_replace( '_', ' ', $parts[0] . '/' . $parts[1] );
            $value = "ZoneInfo|$minDiff|$identifier";

            $timeZoneList[$identifier] = [
                'name' => $display,
                'timecorrection' => $value,
                'region' => $parts[0],
            ];
        }

        return $timeZoneList;
    }
}

class PreferencesForm extends HTMLForm {
    // Override default value from HTMLForm
    protected $mSubSectionBeforeFields = false;

    private $modifiedUser;

    public function setModifiedUser( $user ) {
        $this->modifiedUser = $user;
    }

    public function getModifiedUser() {
        if ( $this->modifiedUser === null ) {
            return $this->getUser();
        } else {
            return $this->modifiedUser;
        }
    }

    public function getExtraSuccessRedirectParameters() {
        return [];
    }

    function wrapForm( $html ) {
        $html = Xml::tags( 'div', [ 'id' => 'preferences' ], $html );

        return parent::wrapForm( $html );
    }

    function getButtons() {

        $attrs = [ 'id' => 'mw-prefs-restoreprefs' ];

        if ( !$this->getModifiedUser()->isAllowedAny( 'editmyprivateinfo', 'editmyoptions' ) ) {
            return '';
        }

        $html = parent::getButtons();

        if ( $this->getModifiedUser()->isAllowed( 'editmyoptions' ) ) {
            $t = SpecialPage::getTitleFor( 'Preferences', 'reset' );

            $html .= "\n" . Linker::link( $t, $this->msg( 'restoreprefs' )->escaped(),
                Html::buttonAttributes( $attrs, [ 'mw-ui-quiet' ] ) );

            $html = Xml::tags( 'div', [ 'class' => 'mw-prefs-buttons' ], $html );
        }

        return $html;
    }

    function filterDataForSubmit( $data ) {
        foreach ( $this->mFlatFields as $fieldname => $field ) {
            if ( $field instanceof HTMLNestedFilterable ) {
                $info = $field->mParams;
                $prefix = isset( $info['prefix'] ) ? $info['prefix'] : $fieldname;
                foreach ( $field->filterDataForSubmit( $data[$fieldname] ) as $key => $value ) {
                    $data["$prefix$key"] = $value;
                }
                unset( $data[$fieldname] );
            }
        }

        return $data;
    }

    function getBody() {
        return $this->displaySection( $this->mFieldTree, '', 'mw-prefsection-' );
    }

    function getLegend( $key ) {
        $legend = parent::getLegend( $key );
        Hooks::run( 'PreferencesGetLegend', [ $this, $key, &$legend ] );
        return $legend;
    }

    function getPreferenceSections() {
        return array_keys( array_filter( $this->mFieldTree, 'is_array' ) );
    }
}