RightsLogFormatter.php

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<?php
class RightsLogFormatter extends LogFormatter {
    protected function makePageLink( Title $title = null, $parameters = array() ) {
        global $wgContLang, $wgUserrightsInterwikiDelimiter;

        if ( !$this->plaintext ) {
            $text = $wgContLang->ucfirst( $title->getText() );
            $parts = explode( $wgUserrightsInterwikiDelimiter, $text, 2 );

            if ( count( $parts ) === 2 ) {
                $titleLink = WikiMap::foreignUserLink( $parts[1], $parts[0],
                    htmlspecialchars( $title->getPrefixedText() ) );

                if ( $titleLink !== false ) {
                    return $titleLink;
                }
            }
        }

        return parent::makePageLink( $title, $parameters );
    }

    protected function getMessageKey() {
        $key = parent::getMessageKey();
        $params = $this->getMessageParameters();
        if ( !isset( $params[3] ) && !isset( $params[4] ) ) {
            $key .= '-legacy';
        }

        return $key;
    }

    protected function getMessageParameters() {
        $params = parent::getMessageParameters();

        // Really old entries
        if ( !isset( $params[3] ) && !isset( $params[4] ) ) {
            return $params;
        }

        $oldGroups = $params[3];
        $newGroups = $params[4];

        // Less old entries
        if ( $oldGroups === '' ) {
            $oldGroups = array();
        } elseif ( is_string( $oldGroups ) ) {
            $oldGroups = array_map( 'trim', explode( ',', $oldGroups ) );
        }
        if ( $newGroups === '' ) {
            $newGroups = array();
        } elseif ( is_string( $newGroups ) ) {
            $newGroups = array_map( 'trim', explode( ',', $newGroups ) );
        }

        $userName = $this->entry->getTarget()->getText();
        if ( !$this->plaintext && count( $oldGroups ) ) {
            foreach ( $oldGroups as &$group ) {
                $group = User::getGroupMember( $group, $userName );
            }
        }
        if ( !$this->plaintext && count( $newGroups ) ) {
            foreach ( $newGroups as &$group ) {
                $group = User::getGroupMember( $group, $userName );
            }
        }

        $lang = $this->context->getLanguage();
        if ( count( $oldGroups ) ) {
            $params[3] = $lang->listToText( $oldGroups );
        } else {
            $params[3] = $this->msg( 'rightsnone' )->text();
        }
        if ( count( $newGroups ) ) {
            // Array_values is used here because of bug 42211
            // see use of array_unique in UserrightsPage::doSaveUserGroups on $newGroups.
            $params[4] = $lang->listToText( array_values( $newGroups ) );
        } else {
            $params[4] = $this->msg( 'rightsnone' )->text();
        }

        return $params;
    }
}