wikimedia/mediawiki-core

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includes/logging/LogFormatter.php

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<?php
/**
 * Contains a class for formatting log entries
 *
 * 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
 * @author Niklas Laxström
 * @license GPL-2.0-or-later
 * @since 1.19
 */

use MediaWiki\CommentFormatter\CommentFormatter;
use MediaWiki\Context\IContextSource;
use MediaWiki\Context\RequestContext;
use MediaWiki\Html\Html;
use MediaWiki\Linker\Linker;
use MediaWiki\Linker\LinkRenderer;
use MediaWiki\Linker\LinkTarget;
use MediaWiki\MainConfigNames;
use MediaWiki\MediaWikiServices;
use MediaWiki\Message\Message;
use MediaWiki\SpecialPage\SpecialPage;
use MediaWiki\Title\Title;
use MediaWiki\User\User;
use MediaWiki\User\UserEditTracker;
use MediaWiki\User\UserIdentity;

/**
 * Implements the default log formatting.
 *
 * Can be overridden by subclassing and setting:
 * @code
 *   $wgLogActionsHandlers['type/subtype'] = 'class'; or
 *   $wgLogActionsHandlers['type/*'] = 'class';
 * @endcode
 *
 * @stable to extend
 * @since 1.19
 */
class LogFormatter {
    // Audience options for viewing usernames, comments, and actions
    public const FOR_PUBLIC = 1;
    public const FOR_THIS_USER = 2;

    // Static->

    /**
     * Constructs a new formatter suitable for given entry.
     * @param LogEntry $entry
     * @return LogFormatter
     * @deprecated since 1.42, use LogFormatterFactory instead
     */
    public static function newFromEntry( LogEntry $entry ) {
        return MediaWikiServices::getInstance()->getLogFormatterFactory()->newFromEntry( $entry );
    }

    /**
     * Handy shortcut for constructing a formatter directly from
     * database row.
     * @param stdClass|array $row
     * @see DatabaseLogEntry::getSelectQueryData
     * @return LogFormatter
     * @deprecated since 1.42, use LogFormatterFactory instead
     */
    public static function newFromRow( $row ) {
        return self::newFromEntry( DatabaseLogEntry::newFromRow( $row ) );
    }

    // Nonstatic->

    /** @var LogEntryBase */
    protected $entry;

    /** @var int Constant for handling log_deleted */
    protected $audience = self::FOR_PUBLIC;

    /** @var IContextSource Context for logging */
    public $context;

    /** @var bool Whether to output user tool links */
    protected $linkFlood = false;

    /**
     * Set to true if we are constructing a message text that is going to
     * be included in page history or send to IRC feed. Links are replaced
     * with plaintext or with [[pagename]] kind of syntax, that is parsed
     * by page histories and IRC feeds.
     * @var bool
     */
    protected $plaintext = false;

    /** @var bool */
    protected $irctext = false;

    /** @var LinkRenderer|null */
    private $linkRenderer;

    /** @var Language|null */
    private $contentLanguage;

    /** @var CommentFormatter|null */
    private $commentFormatter;

    /** @var UserEditTracker|null */
    private $userEditTracker;

    /**
     * @see LogFormatter::getMessageParameters
     * @var array
     */
    protected $parsedParameters;

    /**
     * @stable to call
     *
     * @param LogEntry $entry
     */
    public function __construct( LogEntry $entry ) {
        $this->entry = $entry;
        $this->context = RequestContext::getMain();
    }

    /**
     * Replace the default context
     * @param IContextSource $context
     */
    public function setContext( IContextSource $context ) {
        $this->context = $context;
    }

    /**
     * @since 1.30
     * @param LinkRenderer $linkRenderer
     */
    public function setLinkRenderer( LinkRenderer $linkRenderer ) {
        $this->linkRenderer = $linkRenderer;
    }

    /**
     * @since 1.30
     * @return LinkRenderer
     */
    public function getLinkRenderer() {
        if ( $this->linkRenderer !== null ) {
            return $this->linkRenderer;
        } else {
            wfDeprecated( static::class . " without all required services", '1.42' );
            return MediaWikiServices::getInstance()->getLinkRenderer();
        }
    }

    /**
     * @internal For factory only
     * @since 1.42
     * @param Language $contentLanguage
     */
    final public function setContentLanguage( Language $contentLanguage ) {
        $this->contentLanguage = $contentLanguage;
    }

    /**
     * @since 1.42
     * @return Language
     */
    final public function getContentLanguage(): Language {
        if ( $this->contentLanguage === null ) {
            wfDeprecated( static::class . " without all required services", '1.42' );
            $this->contentLanguage = MediaWikiServices::getInstance()->getContentLanguage();
        }
        return $this->contentLanguage;
    }

    /**
     * @internal For factory only
     * @since 1.42
     * @param CommentFormatter $commentFormatter
     */
    final public function setCommentFormatter( CommentFormatter $commentFormatter ) {
        $this->commentFormatter = $commentFormatter;
    }

    /**
     * @since 1.42
     * @return CommentFormatter
     */
    final public function getCommentFormatter(): CommentFormatter {
        if ( $this->commentFormatter === null ) {
            wfDeprecated( static::class . " without all required services", '1.42' );
            $this->commentFormatter = MediaWikiServices::getInstance()->getCommentFormatter();
        }
        return $this->commentFormatter;
    }

    /**
     * @internal For factory only
     * @since 1.42
     * @param UserEditTracker $userEditTracker
     */
    final public function setUserEditTracker( UserEditTracker $userEditTracker ) {
        $this->userEditTracker = $userEditTracker;
    }

    /**
     * @since 1.42
     * @return UserEditTracker
     */
    final public function getUserEditTracker(): UserEditTracker {
        if ( $this->userEditTracker === null ) {
            wfDeprecated( static::class . " without all required services", '1.42' );
            $this->userEditTracker = MediaWikiServices::getInstance()->getUserEditTracker();
        }
        return $this->userEditTracker;
    }

    /**
     * Set the visibility restrictions for displaying content.
     * If set to public, and an item is deleted, then it will be replaced
     * with a placeholder even if the context user is allowed to view it.
     * @param int $audience Const self::FOR_THIS_USER or self::FOR_PUBLIC
     */
    public function setAudience( $audience ) {
        $this->audience = ( $audience == self::FOR_THIS_USER )
            ? self::FOR_THIS_USER
            : self::FOR_PUBLIC;
    }

    /**
     * Check if a log item type can be displayed
     * @return bool
     */
    public function canViewLogType() {
        // If the user doesn't have the right permission to view the specific
        // log type, return false
        $logRestrictions = $this->context->getConfig()->get( MainConfigNames::LogRestrictions );
        $type = $this->entry->getType();
        return !isset( $logRestrictions[$type] )
            || $this->context->getAuthority()->isAllowed( $logRestrictions[$type] );
    }

    /**
     * Check if a log item can be displayed
     * @param int $field LogPage::DELETED_* constant
     * @return bool
     */
    protected function canView( $field ) {
        if ( $this->audience == self::FOR_THIS_USER ) {
            return LogEventsList::userCanBitfield(
                $this->entry->getDeleted(), $field, $this->context->getAuthority() ) &&
                self::canViewLogType();
        } else {
            return !$this->entry->isDeleted( $field ) && self::canViewLogType();
        }
    }

    /**
     * If set to true, will produce user tool links after
     * the user name. This should be replaced with generic
     * CSS/JS solution.
     * @param bool $value
     */
    public function setShowUserToolLinks( $value ) {
        $this->linkFlood = $value;
    }

    /**
     * Ugly hack to produce plaintext version of the message.
     * Usually you also want to set extraneous request context
     * to avoid formatting for any particular user.
     * @see getActionText()
     * @return string Plain text
     * @return-taint tainted
     */
    public function getPlainActionText() {
        $this->plaintext = true;
        $text = $this->getActionText();
        $this->plaintext = false;

        return $text;
    }

    /**
     * Even uglier hack to maintain backwards compatibility with IRC bots
     * (T36508).
     * @see getActionText()
     * @return string Text
     */
    public function getIRCActionComment() {
        $actionComment = $this->getIRCActionText();
        $comment = $this->entry->getComment();

        if ( $comment != '' ) {
            if ( $actionComment == '' ) {
                $actionComment = $comment;
            } else {
                $actionComment .= wfMessage( 'colon-separator' )->inContentLanguage()->text() . $comment;
            }
        }

        return $actionComment;
    }

    /**
     * Even uglier hack to maintain backwards compatibility with IRC bots
     * (T36508).
     * @see getActionText()
     * @return string Text
     * @suppress SecurityCheck-XSS Working with plaintext
     */
    public function getIRCActionText() {
        $this->plaintext = true;
        $this->irctext = true;

        $entry = $this->entry;
        $parameters = $entry->getParameters();
        // @see LogPage::actionText()
        // Text of title the action is aimed at.
        $target = $entry->getTarget()->getPrefixedText();
        $text = null;
        $contLang = $this->getContentLanguage();
        switch ( $entry->getType() ) {
            case 'move':
                switch ( $entry->getSubtype() ) {
                    case 'move':
                        $movesource = $parameters['4::target'];
                        $text = wfMessage( '1movedto2' )
                            ->rawParams( $target, $movesource )->inContentLanguage()->escaped();
                        break;
                    case 'move_redir':
                        $movesource = $parameters['4::target'];
                        $text = wfMessage( '1movedto2_redir' )
                            ->rawParams( $target, $movesource )->inContentLanguage()->escaped();
                        break;
                    case 'move-noredirect':
                        break;
                    case 'move_redir-noredirect':
                        break;
                }
                break;

            case 'delete':
                switch ( $entry->getSubtype() ) {
                    case 'delete':
                        $text = wfMessage( 'deletedarticle' )
                            ->rawParams( $target )->inContentLanguage()->escaped();
                        break;
                    case 'restore':
                        $text = wfMessage( 'undeletedarticle' )
                            ->rawParams( $target )->inContentLanguage()->escaped();
                        break;
                }
                break;

            case 'patrol':
                // https://github.com/wikimedia/mediawiki/commit/1a05f8faf78675dc85984f27f355b8825b43efff
                // Create a diff link to the patrolled revision
                if ( $entry->getSubtype() === 'patrol' ) {
                    $diffLink = htmlspecialchars(
                        wfMessage( 'patrol-log-diff', $parameters['4::curid'] )
                            ->inContentLanguage()->text() );
                    $text = wfMessage( 'patrol-log-line', $diffLink, "[[$target]]", "" )
                        ->inContentLanguage()->text();
                } else {
                    // broken??
                }
                break;

            case 'protect':
                switch ( $entry->getSubtype() ) {
                    case 'protect':
                        $text = wfMessage( 'protectedarticle' )
                            ->rawParams( $target . ' ' . $parameters['4::description'] )
                            ->inContentLanguage()
                            ->escaped();
                        break;
                    case 'unprotect':
                        $text = wfMessage( 'unprotectedarticle' )
                            ->rawParams( $target )->inContentLanguage()->escaped();
                        break;
                    case 'modify':
                        $text = wfMessage( 'modifiedarticleprotection' )
                            ->rawParams( $target . ' ' . $parameters['4::description'] )
                            ->inContentLanguage()
                            ->escaped();
                        break;
                    case 'move_prot':
                        $text = wfMessage( 'movedarticleprotection' )
                            ->rawParams( $target, $parameters['4::oldtitle'] )->inContentLanguage()->escaped();
                        break;
                }
                break;

            case 'newusers':
                switch ( $entry->getSubtype() ) {
                    case 'newusers':
                    case 'create':
                        $text = wfMessage( 'newuserlog-create-entry' )
                            ->inContentLanguage()->escaped();
                        break;
                    case 'create2':
                    case 'byemail':
                        $text = wfMessage( 'newuserlog-create2-entry' )
                            ->rawParams( $target )->inContentLanguage()->escaped();
                        break;
                    case 'autocreate':
                        $text = wfMessage( 'newuserlog-autocreate-entry' )
                            ->inContentLanguage()->escaped();
                        break;
                }
                break;

            case 'upload':
                switch ( $entry->getSubtype() ) {
                    case 'upload':
                        $text = wfMessage( 'uploadedimage' )
                            ->rawParams( $target )->inContentLanguage()->escaped();
                        break;
                    case 'overwrite':
                    case 'revert':
                        $text = wfMessage( 'overwroteimage' )
                            ->rawParams( $target )->inContentLanguage()->escaped();
                        break;
                }
                break;

            case 'rights':
                if ( count( $parameters['4::oldgroups'] ) ) {
                    $oldgroups = implode( ', ', $parameters['4::oldgroups'] );
                } else {
                    $oldgroups = wfMessage( 'rightsnone' )->inContentLanguage()->escaped();
                }
                if ( count( $parameters['5::newgroups'] ) ) {
                    $newgroups = implode( ', ', $parameters['5::newgroups'] );
                } else {
                    $newgroups = wfMessage( 'rightsnone' )->inContentLanguage()->escaped();
                }
                switch ( $entry->getSubtype() ) {
                    case 'rights':
                        $text = wfMessage( 'rightslogentry' )
                            ->rawParams( $target, $oldgroups, $newgroups )->inContentLanguage()->escaped();
                        break;
                    case 'autopromote':
                        $text = wfMessage( 'rightslogentry-autopromote' )
                            ->rawParams( $target, $oldgroups, $newgroups )->inContentLanguage()->escaped();
                        break;
                }
                break;

            case 'merge':
                $text = wfMessage( 'pagemerge-logentry' )
                    ->rawParams( $target, $parameters['4::dest'], $parameters['5::mergepoint'] )
                    ->inContentLanguage()->escaped();
                break;

            case 'block':
                switch ( $entry->getSubtype() ) {
                    case 'block':
                        // Keep compatibility with extensions by checking for
                        // new key (5::duration/6::flags) or old key (0/optional 1)
                        if ( $entry->isLegacy() ) {
                            $rawDuration = $parameters[0];
                            $rawFlags = $parameters[1] ?? '';
                        } else {
                            $rawDuration = $parameters['5::duration'];
                            $rawFlags = $parameters['6::flags'];
                        }
                        $duration = $contLang->translateBlockExpiry(
                            $rawDuration,
                            null,
                            (int)wfTimestamp( TS_UNIX, $entry->getTimestamp() )
                        );
                        $flags = BlockLogFormatter::formatBlockFlags( $rawFlags, $contLang );
                        $text = wfMessage( 'blocklogentry' )
                            ->rawParams( $target, $duration, $flags )->inContentLanguage()->escaped();
                        break;
                    case 'unblock':
                        $text = wfMessage( 'unblocklogentry' )
                            ->rawParams( $target )->inContentLanguage()->escaped();
                        break;
                    case 'reblock':
                        $duration = $contLang->translateBlockExpiry(
                            $parameters['5::duration'],
                            null,
                            (int)wfTimestamp( TS_UNIX, $entry->getTimestamp() )
                        );
                        $flags = BlockLogFormatter::formatBlockFlags( $parameters['6::flags'],
                            $contLang );
                        $text = wfMessage( 'reblock-logentry' )
                            ->rawParams( $target, $duration, $flags )->inContentLanguage()->escaped();
                        break;
                }
                break;

            case 'import':
                switch ( $entry->getSubtype() ) {
                    case 'upload':
                        $text = wfMessage( 'import-logentry-upload' )
                            ->rawParams( $target )->inContentLanguage()->escaped();
                        break;
                    case 'interwiki':
                        $text = wfMessage( 'import-logentry-interwiki' )
                            ->rawParams( $target )->inContentLanguage()->escaped();
                        break;
                }
                break;
            // case 'suppress' --private log -- aaron  (so we know who to blame in a few years :-D)
            // default:
        }

        $this->plaintext = false;
        $this->irctext = false;

        return $text ?? $this->getPlainActionText();
    }

    /**
     * Gets the log action, including username.
     * @stable to override
     * @return string HTML
     * phan-taint-check gets very confused by $this->plaintext, so disable.
     * @return-taint onlysafefor_html
     */
    public function getActionText() {
        if ( $this->canView( LogPage::DELETED_ACTION ) ) {
            $element = $this->getActionMessage();
            if ( $element instanceof Message ) {
                $element = $this->plaintext ? $element->text() : $element->escaped();
            }
            if ( $this->entry->isDeleted( LogPage::DELETED_ACTION ) ) {
                $element = $this->styleRestrictedElement( $element );
            }
        } else {
            $sep = $this->msg( 'word-separator' );
            $sep = $this->plaintext ? $sep->text() : $sep->escaped();
            $performer = $this->getPerformerElement();
            $element = $performer . $sep . $this->getRestrictedElement( 'rev-deleted-event' );
        }

        return $element;
    }

    /**
     * Returns a sentence describing the log action. Usually
     * a Message object is returned, but old style log types
     * and entries might return pre-escaped HTML string.
     * @return Message|string Pre-escaped HTML
     */
    protected function getActionMessage() {
        $message = $this->msg( $this->getMessageKey() );
        $message->params( $this->getMessageParameters() );

        return $message;
    }

    /**
     * Returns a key to be used for formatting the action sentence.
     * Default is logentry-TYPE-SUBTYPE for modern logs. Legacy log
     * types will use custom keys, and subclasses can also alter the
     * key depending on the entry itself.
     * @stable to override
     * @return string Message key
     */
    protected function getMessageKey() {
        $type = $this->entry->getType();
        $subtype = $this->entry->getSubtype();

        return "logentry-$type-$subtype";
    }

    /**
     * Returns extra links that comes after the action text, like "revert", etc.
     *
     * @stable to override
     * @return string
     */
    public function getActionLinks() {
        return '';
    }

    /**
     * Extracts the optional extra parameters for use in action messages.
     * The array indexes start from number 3.
     * @stable to override
     * @return array
     */
    protected function extractParameters() {
        $entry = $this->entry;
        $params = [];

        if ( $entry->isLegacy() ) {
            foreach ( $entry->getParameters() as $index => $value ) {
                $params[$index + 3] = $value;
            }
        }

        // Filter out parameters which are not in format #:foo
        foreach ( $entry->getParameters() as $key => $value ) {
            if ( strpos( $key, ':' ) === false ) {
                continue;
            }
            [ $index, $type, ] = explode( ':', $key, 3 );
            if ( ctype_digit( $index ) ) {
                $params[(int)$index - 1] = $this->formatParameterValue( $type, $value );
            }
        }

        /* Message class doesn't like non consecutive numbering.
         * Fill in missing indexes with empty strings to avoid
         * incorrect renumbering.
         */
        if ( count( $params ) ) {
            $max = max( array_keys( $params ) );
            // index 0 to 2 are added in getMessageParameters
            for ( $i = 3; $i < $max; $i++ ) {
                if ( !isset( $params[$i] ) ) {
                    $params[$i] = '';
                }
            }
        }

        return $params;
    }

    /**
     * Formats parameters intended for action message from array of all parameters.
     * There are three hardcoded parameters:
     *  - $1: user name with premade link
     *  - $2: usable for gender magic function
     *  - $3: target page with premade link
     * More parameters might be present, depending on what code created the log
     * entry.
     *
     * The parameters are returned as a non-associative array that can be passed to
     * Message::params(), so $logFormatter->getMessageParameters()[0] is the $1 parameter
     * in the message and so on.
     *
     * @stable to override
     * @return array
     * @see ManualLogEntry::setParameters() for how parameters are determined.
     */
    protected function getMessageParameters() {
        if ( isset( $this->parsedParameters ) ) {
            return $this->parsedParameters;
        }

        $entry = $this->entry;
        $params = $this->extractParameters();
        $params[0] = Message::rawParam( $this->getPerformerElement() );
        $params[1] = $this->canView( LogPage::DELETED_USER ) ? $entry->getPerformerIdentity()->getName() : '';
        $params[2] = Message::rawParam( $this->makePageLink( $entry->getTarget() ) );

        // Bad things happens if the numbers are not in correct order
        ksort( $params );

        $this->parsedParameters = $params;
        return $this->parsedParameters;
    }

    /**
     * Formats parameters values dependent to their type
     * @param string $type The type of the value.
     *   Valid are currently:
     *     * - (empty) or plain: The value is returned as-is
     *     * raw: The value will be added to the log message
     *            as raw parameter (e.g. no escaping)
     *            Use this only if there is no other working
     *            type like user-link or title-link
     *     * msg: The value is a message-key, the output is
     *            the message in user language
     *     * msg-content: The value is a message-key, the output
     *                    is the message in content language
     *     * user: The value is a user name, e.g. for GENDER
     *     * user-link: The value is a user name, returns a
     *                  link for the user
     *     * title: The value is a page title,
     *              returns name of page
     *     * title-link: The value is a page title,
     *                   returns link to this page
     *     * number: Format value as number
     *     * list: Format value as a comma-separated list
     * @param mixed $value The parameter value that should be formatted
     * @return mixed Formatted value
     * @since 1.21
     */
    protected function formatParameterValue( $type, $value ) {
        $saveLinkFlood = $this->linkFlood;

        switch ( strtolower( trim( $type ) ) ) {
            case 'raw':
                $value = Message::rawParam( $value );
                break;
            case 'list':
                $value = $this->context->getLanguage()->commaList( $value );
                break;
            case 'msg':
                $value = $this->msg( $value )->text();
                break;
            case 'msg-content':
                $value = $this->msg( $value )->inContentLanguage()->text();
                break;
            case 'number':
                $value = Message::numParam( $value );
                break;
            case 'user':
                $user = User::newFromName( $value );
                $value = $user->getName();
                break;
            case 'user-link':
                $this->setShowUserToolLinks( false );

                $user = User::newFromName( $value );

                if ( !$user ) {
                    $value = $this->msg( 'empty-username' )->text();
                } else {
                    $value = Message::rawParam( $this->makeUserLink( $user ) );
                    $this->setShowUserToolLinks( $saveLinkFlood );
                }
                break;
            case 'title':
                $title = Title::newFromText( $value );
                $value = $title->getPrefixedText();
                break;
            case 'title-link':
                $title = Title::newFromText( $value );
                $value = Message::rawParam( $this->makePageLink( $title ) );
                break;
            case 'plain':
                // Plain text, nothing to do
            default:
                // Catch other types and use the old behavior (return as-is)
        }

        return $value;
    }

    /**
     * Helper to make a link to the page, taking the plaintext
     * value in consideration.
     * @stable to override
     * @param Title|null $title The page
     * @param array $parameters Query parameters
     * @param string|null $html Linktext of the link as raw html
     * @return string wikitext or html
     * @return-taint onlysafefor_html
     */
    protected function makePageLink( Title $title = null, $parameters = [], $html = null ) {
        if ( !$title instanceof Title ) {
            $msg = $this->msg( 'invalidtitle' )->text();
            if ( $this->plaintext ) {
                return $msg;
            } else {
                return Html::element( 'span', [ 'class' => 'mw-invalidtitle' ], $msg );
            }
        }

        if ( $this->plaintext ) {
            $link = '[[' . $title->getPrefixedText() . ']]';
        } else {
            $html = $html !== null ? new HtmlArmor( $html ) : $html;
            $link = $this->getLinkRenderer()->makeLink( $title, $html, [], $parameters );
        }

        return $link;
    }

    /**
     * Provides the name of the user who performed the log action.
     * Used as part of log action message or standalone, depending
     * which parts of the log entry has been hidden.
     * @return string
     */
    public function getPerformerElement() {
        if ( $this->canView( LogPage::DELETED_USER ) ) {
            $performerIdentity = $this->entry->getPerformerIdentity();
            $element = $this->makeUserLink( $performerIdentity );
            if ( $this->entry->isDeleted( LogPage::DELETED_USER ) ) {
                $element = $this->styleRestrictedElement( $element );
            }
        } else {
            $element = $this->getRestrictedElement( 'rev-deleted-user' );
        }

        return $element;
    }

    /**
     * Gets the user provided comment
     * @stable to override
     * @return string HTML
     */
    public function getComment() {
        if ( $this->canView( LogPage::DELETED_COMMENT ) ) {
            $comment = $this->getCommentFormatter()
                ->formatBlock( $this->entry->getComment() );
            // No hard coded spaces thanx
            $element = ltrim( $comment );
            if ( $this->entry->isDeleted( LogPage::DELETED_COMMENT ) ) {
                $element = $this->styleRestrictedElement( $element );
            }
        } else {
            $element = $this->getRestrictedElement( 'rev-deleted-comment' );
        }

        return $element;
    }

    /**
     * Helper method for displaying restricted element.
     * @param string $message
     * @return string HTML or wiki text
     * @return-taint onlysafefor_html
     */
    protected function getRestrictedElement( $message ) {
        if ( $this->plaintext ) {
            return $this->msg( $message )->text();
        }

        return $this->styleRestrictedElement( $this->msg( $message )->escaped() );
    }

    /**
     * Helper method for styling restricted element.
     * @param string $content
     * @return string HTML or wiki text
     */
    protected function styleRestrictedElement( $content ) {
        if ( $this->plaintext ) {
            return $content;
        }
        $attribs = [ 'class' => [ 'history-deleted' ] ];
        if ( $this->entry->isDeleted( LogPage::DELETED_RESTRICTED ) ) {
            $attribs['class'][] = 'mw-history-suppressed';
        }

        return Html::rawElement( 'span', $attribs, $content );
    }

    /**
     * Shortcut for wfMessage which honors local context.
     * @param string $key
     * @param mixed ...$params
     * @return Message
     */
    protected function msg( $key, ...$params ) {
        return $this->context->msg( $key, ...$params );
    }

    /**
     * @param UserIdentity $user
     * @param int $toolFlags Combination of Linker::TOOL_LINKS_* flags
     * @return string wikitext or html
     * @return-taint onlysafefor_html
     */
    protected function makeUserLink( UserIdentity $user, $toolFlags = 0 ) {
        if ( $this->plaintext ) {
            $element = $user->getName();
        } else {
            $element = Linker::userLink(
                $user->getId(),
                $user->getName()
            );
            if ( $this->linkFlood ) {
                $editCount = $this->getUserEditTracker()->getUserEditCount( $user );

                $element .= Linker::userToolLinks(
                    $user->getId(),
                    $user->getName(),
                    true, // redContribsWhenNoEdits
                    $toolFlags,
                    $editCount,
                    // do not render parentheses in the HTML markup (CSS will provide)
                    false
                );
            }
        }

        return $element;
    }

    /**
     * @stable to override
     * @return LinkTarget[] Array of titles that should be preloaded with LinkBatch
     */
    public function getPreloadTitles() {
        return [];
    }

    /**
     * @return array Output of getMessageParameters() for testing
     */
    public function getMessageParametersForTesting() {
        // This function was added because getMessageParameters() is
        // protected and a change from protected to public caused
        // problems with extensions
        return $this->getMessageParameters();
    }

    /**
     * Get the array of parameters, converted from legacy format if necessary.
     * @since 1.25
     * @stable to override
     * @return array
     */
    protected function getParametersForApi() {
        return $this->entry->getParameters();
    }

    /**
     * Format parameters for API output
     *
     * The result array should generally map named keys to values. Index and
     * type should be omitted, e.g. "4::foo" should be returned as "foo" in the
     * output. Values should generally be unformatted.
     *
     * Renames or removals of keys besides from the legacy numeric format to
     * modern named style should be avoided. Any renames should be announced to
     * the mediawiki-api-announce mailing list.
     *
     * @since 1.25
     * @stable to override
     * @return array
     */
    public function formatParametersForApi() {
        $logParams = [];
        foreach ( $this->getParametersForApi() as $key => $value ) {
            $vals = explode( ':', $key, 3 );
            if ( count( $vals ) !== 3 ) {
                if ( $value instanceof __PHP_Incomplete_Class ) {
                    wfLogWarning( 'Log entry of type ' . $this->entry->getFullType() .
                        ' contains unrecoverable extra parameters.' );
                    continue;
                }
                $logParams[$key] = $value;
                continue;
            }
            $logParams += $this->formatParameterValueForApi( $vals[2], $vals[1], $value );
        }
        ApiResult::setIndexedTagName( $logParams, 'param' );
        ApiResult::setArrayType( $logParams, 'assoc' );

        return $logParams;
    }

    /**
     * Format a single parameter value for API output
     *
     * @since 1.25
     * @param string $name
     * @param string $type
     * @param string $value
     * @return array
     */
    protected function formatParameterValueForApi( $name, $type, $value ) {
        $type = strtolower( trim( $type ) );
        switch ( $type ) {
            case 'bool':
                $value = (bool)$value;
                break;

            case 'number':
                if ( is_int( $value ) || ctype_digit( (string)$value ) ) {
                    $value = (int)$value;
                } else {
                    $value = (float)$value;
                }
                break;

            case 'array':
            case 'assoc':
            case 'kvp':
                if ( is_array( $value ) ) {
                    ApiResult::setArrayType( $value, $type );
                }
                break;

            case 'timestamp':
                $value = wfTimestamp( TS_ISO_8601, $value );
                break;

            case 'msg':
            case 'msg-content':
                $msg = $this->msg( $value );
                if ( $type === 'msg-content' ) {
                    $msg->inContentLanguage();
                }
                $value = [];
                $value["{$name}_key"] = $msg->getKey();
                if ( $msg->getParams() ) {
                    $value["{$name}_params"] = $msg->getParams();
                }
                $value["{$name}_text"] = $msg->text();
                return $value;

            case 'title':
            case 'title-link':
                $title = Title::newFromText( $value );
                if ( !$title ) {
                    $title = SpecialPage::getTitleFor( 'Badtitle', $value );
                }
                $value = [];
                ApiQueryBase::addTitleInfo( $value, $title, "{$name}_" );
                return $value;

            case 'user':
            case 'user-link':
                $user = User::newFromName( $value );
                if ( $user ) {
                    $value = $user->getName();
                }
                break;

            default:
                // do nothing
                break;
        }

        return [ $name => $value ];
    }
}