PHPSessionHandler: Implement SessionHandlerInterface

[mediawiki.git] / includes / logging / LogEventsList.php

<?php
/**
 * Contain classes to list log entries
 *
 * Copyright © 2004 Brion Vibber <brion@pobox.com>, 2008 Aaron Schulz
 * https://www.mediawiki.org/
 *
 * 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
 */

class LogEventsList extends ContextSource {
        const NO_ACTION_LINK = 1;
        const NO_EXTRA_USER_LINKS = 2;
        const USE_CHECKBOXES = 4;

        public $flags;

        /**
         * @var array
         */
        protected $mDefaultQuery;

        /**
         * @var bool
         */
        protected $showTagEditUI;

        /**
         * Constructor.
         * The first two parameters used to be $skin and $out, but now only a context
         * is needed, that's why there's a second unused parameter.
         *
         * @param IContextSource|Skin $context Context to use; formerly it was
         *   a Skin object. Use of Skin is deprecated.
         * @param null $unused Unused; used to be an OutputPage object.
         * @param int $flags Can be a combination of self::NO_ACTION_LINK,
         *   self::NO_EXTRA_USER_LINKS or self::USE_CHECKBOXES.
         */
        public function __construct( $context, $unused = null, $flags = 0 ) {
                if ( $context instanceof IContextSource ) {
                        $this->setContext( $context );
                } else {
                        // Old parameters, $context should be a Skin object
                        $this->setContext( $context->getContext() );
                }

                $this->flags = $flags;
                $this->showTagEditUI = ChangeTags::showTagEditingUI( $this->getUser() );
        }

        /**
         * Show options for the log list
         *
         * @param array|string $types
         * @param string $user
         * @param string $page
         * @param string $pattern
         * @param int $year Year
         * @param int $month Month
         * @param array $filter
         * @param string $tagFilter Tag to select by default
         */
        public function showOptions( $types = array(), $user = '', $page = '', $pattern = '', $year = 0,
                $month = 0, $filter = null, $tagFilter = ''
        ) {
                global $wgScript, $wgMiserMode;

                $title = SpecialPage::getTitleFor( 'Log' );

                // For B/C, we take strings, but make sure they are converted...
                $types = ( $types === '' ) ? array() : (array)$types;

                $tagSelector = ChangeTags::buildTagFilterSelector( $tagFilter );

                $html = Html::hidden( 'title', $title->getPrefixedDBkey() );

                // Basic selectors
                $html .= $this->getTypeMenu( $types ) . "\n";
                $html .= $this->getUserInput( $user ) . "\n";
                $html .= $this->getTitleInput( $page ) . "\n";
                $html .= $this->getExtraInputs( $types ) . "\n";

                // Title pattern, if allowed
                if ( !$wgMiserMode ) {
                        $html .= $this->getTitlePattern( $pattern ) . "\n";
                }

                // date menu
                $html .= Xml::tags( 'p', null, Xml::dateMenu( (int)$year, (int)$month ) );

                // Tag filter
                if ( $tagSelector ) {
                        $html .= Xml::tags( 'p', null, implode( '&#160;', $tagSelector ) );
                }

                // Filter links
                if ( $filter ) {
                        $html .= Xml::tags( 'p', null, $this->getFilterLinks( $filter ) );
                }

                // Submit button
                $html .= Xml::submitButton( $this->msg( 'logeventslist-submit' )->text() );

                // Fieldset
                $html = Xml::fieldset( $this->msg( 'log' )->text(), $html );

                // Form wrapping
                $html = Xml::tags( 'form', array( 'action' => $wgScript, 'method' => 'get' ), $html );

                $this->getOutput()->addHTML( $html );
        }

        /**
         * @param array $filter
         * @return string Formatted HTML
         */
        private function getFilterLinks( $filter ) {
                // show/hide links
                $messages = array( $this->msg( 'show' )->escaped(), $this->msg( 'hide' )->escaped() );
                // Option value -> message mapping
                $links = array();
                $hiddens = ''; // keep track for "go" button
                foreach ( $filter as $type => $val ) {
                        // Should the below assignment be outside the foreach?
                        // Then it would have to be copied. Not certain what is more expensive.
                        $query = $this->getDefaultQuery();
                        $queryKey = "hide_{$type}_log";

                        $hideVal = 1 - intval( $val );
                        $query[$queryKey] = $hideVal;

                        $link = Linker::linkKnown(
                                $this->getTitle(),
                                $messages[$hideVal],
                                array(),
                                $query
                        );

                        // Message: log-show-hide-patrol
                        $links[$type] = $this->msg( "log-show-hide-{$type}" )->rawParams( $link )->escaped();
                        $hiddens .= Html::hidden( "hide_{$type}_log", $val ) . "\n";
                }

                // Build links
                return '<small>' . $this->getLanguage()->pipeList( $links ) . '</small>' . $hiddens;
        }

        private function getDefaultQuery() {
                if ( !isset( $this->mDefaultQuery ) ) {
                        $this->mDefaultQuery = $this->getRequest()->getQueryValues();
                        unset( $this->mDefaultQuery['title'] );
                        unset( $this->mDefaultQuery['dir'] );
                        unset( $this->mDefaultQuery['offset'] );
                        unset( $this->mDefaultQuery['limit'] );
                        unset( $this->mDefaultQuery['order'] );
                        unset( $this->mDefaultQuery['month'] );
                        unset( $this->mDefaultQuery['year'] );
                }

                return $this->mDefaultQuery;
        }

        /**
         * @param array $queryTypes
         * @return string Formatted HTML
         */
        private function getTypeMenu( $queryTypes ) {
                $queryType = count( $queryTypes ) == 1 ? $queryTypes[0] : '';
                $selector = $this->getTypeSelector();
                $selector->setDefault( $queryType );

                return $selector->getHtml();
        }

        /**
         * Returns log page selector.
         * @return XmlSelect
         * @since 1.19
         */
        public function getTypeSelector() {
                $typesByName = array(); // Temporary array
                // First pass to load the log names
                foreach ( LogPage::validTypes() as $type ) {
                        $page = new LogPage( $type );
                        $restriction = $page->getRestriction();
                        if ( $this->getUser()->isAllowed( $restriction ) ) {
                                $typesByName[$type] = $page->getName()->text();
                        }
                }

                // Second pass to sort by name
                asort( $typesByName );

                // Always put "All public logs" on top
                $public = $typesByName[''];
                unset( $typesByName[''] );
                $typesByName = array( '' => $public ) + $typesByName;

                $select = new XmlSelect( 'type' );
                foreach ( $typesByName as $type => $name ) {
                        $select->addOption( $name, $type );
                }

                return $select;
        }

        /**
         * @param string $user
         * @return string Formatted HTML
         */
        private function getUserInput( $user ) {
                $label = Xml::inputLabel(
                        $this->msg( 'specialloguserlabel' )->text(),
                        'user',
                        'mw-log-user',
                        15,
                        $user,
                        array( 'class' => 'mw-autocomplete-user' )
                );

                return '<span class="mw-input-with-label">' . $label . '</span>';
        }

        /**
         * @param string $title
         * @return string Formatted HTML
         */
        private function getTitleInput( $title ) {
                $label = Xml::inputLabel(
                        $this->msg( 'speciallogtitlelabel' )->text(),
                        'page',
                        'mw-log-page',
                        20,
                        $title
                );

                return '<span class="mw-input-with-label">' . $label .  '</span>';
        }

        /**
         * @param string $pattern
         * @return string Checkbox
         */
        private function getTitlePattern( $pattern ) {
                return '<span class="mw-input-with-label">' .
                        Xml::checkLabel( $this->msg( 'log-title-wildcard' )->text(), 'pattern', 'pattern', $pattern ) .
                        '</span>';
        }

        /**
         * @param array $types
         * @return string
         */
        private function getExtraInputs( $types ) {
                if ( count( $types ) == 1 ) {
                        if ( $types[0] == 'suppress' ) {
                                $offender = $this->getRequest()->getVal( 'offender' );
                                $user = User::newFromName( $offender, false );
                                if ( !$user || ( $user->getId() == 0 && !IP::isIPAddress( $offender ) ) ) {
                                        $offender = ''; // Blank field if invalid
                                }
                                return Xml::inputLabel( $this->msg( 'revdelete-offender' )->text(), 'offender',
                                        'mw-log-offender', 20, $offender );
                        } else {
                                // Allow extensions to add their own extra inputs
                                $input = '';
                                Hooks::run( 'LogEventsListGetExtraInputs', array( $types[0], $this, &$input ) );
                                return $input;
                        }
                }

                return '';
        }

        /**
         * @return string
         */
        public function beginLogEventsList() {
                return "<ul>\n";
        }

        /**
         * @return string
         */
        public function endLogEventsList() {
                return "</ul>\n";
        }

        /**
         * @param stdClass $row A single row from the result set
         * @return string Formatted HTML list item
         */
        public function logLine( $row ) {
                $entry = DatabaseLogEntry::newFromRow( $row );
                $formatter = LogFormatter::newFromEntry( $entry );
                $formatter->setContext( $this->getContext() );
                $formatter->setShowUserToolLinks( !( $this->flags & self::NO_EXTRA_USER_LINKS ) );

                $time = htmlspecialchars( $this->getLanguage()->userTimeAndDate(
                        $entry->getTimestamp(), $this->getUser() ) );

                $action = $formatter->getActionText();

                if ( $this->flags & self::NO_ACTION_LINK ) {
                        $revert = '';
                } else {
                        $revert = $formatter->getActionLinks();
                        if ( $revert != '' ) {
                                $revert = '<span class="mw-logevent-actionlink">' . $revert . '</span>';
                        }
                }

                $comment = $formatter->getComment();

                // Some user can hide log items and have review links
                $del = $this->getShowHideLinks( $row );

                // Any tags...
                list( $tagDisplay, $newClasses ) = ChangeTags::formatSummaryRow( $row->ts_tags, 'logevent' );
                $classes = array_merge(
                        array( 'mw-logline-' . $entry->getType() ),
                        $newClasses
                );

                return Html::rawElement( 'li', array( 'class' => $classes ),
                        "$del $time $action $comment $revert $tagDisplay" ) . "\n";
        }

        /**
         * @param stdClass $row Row
         * @return string
         */
        private function getShowHideLinks( $row ) {
                // We don't want to see the links and
                if ( $this->flags == self::NO_ACTION_LINK ) {
                        return '';
                }

                $user = $this->getUser();

                // If change tag editing is available to this user, return the checkbox
                if ( $this->flags & self::USE_CHECKBOXES && $this->showTagEditUI ) {
                        return Xml::check(
                                'showhiderevisions',
                                false,
                                array( 'name' => 'ids[' . $row->log_id . ']' )
                        );
                }

                // no one can hide items from the suppress log.
                if ( $row->log_type == 'suppress' ) {
                        return '';
                }

                $del = '';
                // Don't show useless checkbox to people who cannot hide log entries
                if ( $user->isAllowed( 'deletedhistory' ) ) {
                        $canHide = $user->isAllowed( 'deletelogentry' );
                        $canViewSuppressedOnly = $user->isAllowed( 'viewsuppressed' ) &&
                                !$user->isAllowed( 'suppressrevision' );
                        $entryIsSuppressed = self::isDeleted( $row, LogPage::DELETED_RESTRICTED );
                        $canViewThisSuppressedEntry = $canViewSuppressedOnly && $entryIsSuppressed;
                        if ( $row->log_deleted || $canHide ) {
                                // Show checkboxes instead of links.
                                if ( $canHide && $this->flags & self::USE_CHECKBOXES && !$canViewThisSuppressedEntry ) {
                                        // If event was hidden from sysops
                                        if ( !self::userCan( $row, LogPage::DELETED_RESTRICTED, $user ) ) {
                                                $del = Xml::check( 'deleterevisions', false, array( 'disabled' => 'disabled' ) );
                                        } else {
                                                $del = Xml::check(
                                                        'showhiderevisions',
                                                        false,
                                                        array( 'name' => 'ids[' . $row->log_id . ']' )
                                                );
                                        }
                                } else {
                                        // If event was hidden from sysops
                                        if ( !self::userCan( $row, LogPage::DELETED_RESTRICTED, $user ) ) {
                                                $del = Linker::revDeleteLinkDisabled( $canHide );
                                        } else {
                                                $query = array(
                                                        'target' => SpecialPage::getTitleFor( 'Log', $row->log_type )->getPrefixedDBkey(),
                                                        'type' => 'logging',
                                                        'ids' => $row->log_id,
                                                );
                                                $del = Linker::revDeleteLink(
                                                        $query,
                                                        $entryIsSuppressed,
                                                        $canHide && !$canViewThisSuppressedEntry
                                                );
                                        }
                                }
                        }
                }

                return $del;
        }

        /**
         * @param stdClass $row Row
         * @param string|array $type
         * @param string|array $action
         * @param string $right
         * @return bool
         */
        public static function typeAction( $row, $type, $action, $right = '' ) {
                $match = is_array( $type ) ?
                        in_array( $row->log_type, $type ) : $row->log_type == $type;
                if ( $match ) {
                        $match = is_array( $action ) ?
                                in_array( $row->log_action, $action ) : $row->log_action == $action;
                        if ( $match && $right ) {
                                global $wgUser;
                                $match = $wgUser->isAllowed( $right );
                        }
                }

                return $match;
        }

        /**
         * Determine if the current user is allowed to view a particular
         * field of this log row, if it's marked as deleted.
         *
         * @param stdClass $row Row
         * @param int $field
         * @param User $user User to check, or null to use $wgUser
         * @return bool
         */
        public static function userCan( $row, $field, User $user = null ) {
                return self::userCanBitfield( $row->log_deleted, $field, $user );
        }

        /**
         * Determine if the current user is allowed to view a particular
         * field of this log row, if it's marked as deleted.
         *
         * @param int $bitfield Current field
         * @param int $field
         * @param User $user User to check, or null to use $wgUser
         * @return bool
         */
        public static function userCanBitfield( $bitfield, $field, User $user = null ) {
                if ( $bitfield & $field ) {
                        if ( $user === null ) {
                                global $wgUser;
                                $user = $wgUser;
                        }
                        if ( $bitfield & LogPage::DELETED_RESTRICTED ) {
                                $permissions = array( 'suppressrevision', 'viewsuppressed' );
                        } else {
                                $permissions = array( 'deletedhistory' );
                        }
                        $permissionlist = implode( ', ', $permissions );
                        wfDebug( "Checking for $permissionlist due to $field match on $bitfield\n" );
                        return call_user_func_array( array( $user, 'isAllowedAny' ), $permissions );
                }
                return true;
        }

        /**
         * @param stdClass $row Row
         * @param int $field One of DELETED_* bitfield constants
         * @return bool
         */
        public static function isDeleted( $row, $field ) {
                return ( $row->log_deleted & $field ) == $field;
        }

        /**
         * Show log extract. Either with text and a box (set $msgKey) or without (don't set $msgKey)
         *
         * @param OutputPage|string $out By-reference
         * @param string|array $types Log types to show
         * @param string|Title $page The page title to show log entries for
         * @param string $user The user who made the log entries
         * @param array $param Associative Array with the following additional options:
         * - lim Integer Limit of items to show, default is 50
         * - conds Array Extra conditions for the query (e.g. "log_action != 'revision'")
         * - showIfEmpty boolean Set to false if you don't want any output in case the loglist is empty
         *   if set to true (default), "No matching items in log" is displayed if loglist is empty
         * - msgKey Array If you want a nice box with a message, set this to the key of the message.
         *   First element is the message key, additional optional elements are parameters for the key
         *   that are processed with wfMessage
         * - offset Set to overwrite offset parameter in WebRequest
         *   set to '' to unset offset
         * - wrap String Wrap the message in html (usually something like "<div ...>$1</div>").
         * - flags Integer display flags (NO_ACTION_LINK,NO_EXTRA_USER_LINKS)
         * - useRequestParams boolean Set true to use Pager-related parameters in the WebRequest
         * - useMaster boolean Use master DB
         * @return int Number of total log items (not limited by $lim)
         */
        public static function showLogExtract(
                &$out, $types = array(), $page = '', $user = '', $param = array()
        ) {
                $defaultParameters = array(
                        'lim' => 25,
                        'conds' => array(),
                        'showIfEmpty' => true,
                        'msgKey' => array( '' ),
                        'wrap' => "$1",
                        'flags' => 0,
                        'useRequestParams' => false,
                        'useMaster' => false,
                );
                # The + operator appends elements of remaining keys from the right
                # handed array to the left handed, whereas duplicated keys are NOT overwritten.
                $param += $defaultParameters;
                # Convert $param array to individual variables
                $lim = $param['lim'];
                $conds = $param['conds'];
                $showIfEmpty = $param['showIfEmpty'];
                $msgKey = $param['msgKey'];
                $wrap = $param['wrap'];
                $flags = $param['flags'];
                $useRequestParams = $param['useRequestParams'];
                if ( !is_array( $msgKey ) ) {
                        $msgKey = array( $msgKey );
                }

                if ( $out instanceof OutputPage ) {
                        $context = $out->getContext();
                } else {
                        $context = RequestContext::getMain();
                }

                # Insert list of top 50 (or top $lim) items
                $loglist = new LogEventsList( $context, null, $flags );
                $pager = new LogPager( $loglist, $types, $user, $page, '', $conds );
                if ( !$useRequestParams ) {
                        # Reset vars that may have been taken from the request
                        $pager->mLimit = 50;
                        $pager->mDefaultLimit = 50;
                        $pager->mOffset = "";
                        $pager->mIsBackwards = false;
                }

                if ( $param['useMaster'] ) {
                        $pager->mDb = wfGetDB( DB_MASTER );
                }
                if ( isset( $param['offset'] ) ) { # Tell pager to ignore WebRequest offset
                        $pager->setOffset( $param['offset'] );
                }

                if ( $lim > 0 ) {
                        $pager->mLimit = $lim;
                }
                // Fetch the log rows and build the HTML if needed
                $logBody = $pager->getBody();
                $numRows = $pager->getNumRows();

                $s = '';

                if ( $logBody ) {
                        if ( $msgKey[0] ) {
                                $dir = $context->getLanguage()->getDir();
                                $lang = $context->getLanguage()->getHtmlCode();

                                $s = Xml::openElement( 'div', array(
                                        'class' => "mw-warning-with-logexcerpt mw-content-$dir",
                                        'dir' => $dir,
                                        'lang' => $lang,
                                ) );

                                if ( count( $msgKey ) == 1 ) {
                                        $s .= $context->msg( $msgKey[0] )->parseAsBlock();
                                } else { // Process additional arguments
                                        $args = $msgKey;
                                        array_shift( $args );
                                        $s .= $context->msg( $msgKey[0], $args )->parseAsBlock();
                                }
                        }
                        $s .= $loglist->beginLogEventsList() .
                                $logBody .
                                $loglist->endLogEventsList();
                } elseif ( $showIfEmpty ) {
                        $s = Html::rawElement( 'div', array( 'class' => 'mw-warning-logempty' ),
                                $context->msg( 'logempty' )->parse() );
                }

                if ( $numRows > $pager->mLimit ) { # Show "Full log" link
                        $urlParam = array();
                        if ( $page instanceof Title ) {
                                $urlParam['page'] = $page->getPrefixedDBkey();
                        } elseif ( $page != '' ) {
                                $urlParam['page'] = $page;
                        }

                        if ( $user != '' ) {
                                $urlParam['user'] = $user;
                        }

                        if ( !is_array( $types ) ) { # Make it an array, if it isn't
                                $types = array( $types );
                        }

                        # If there is exactly one log type, we can link to Special:Log?type=foo
                        if ( count( $types ) == 1 ) {
                                $urlParam['type'] = $types[0];
                        }

                        $s .= Linker::link(
                                SpecialPage::getTitleFor( 'Log' ),
                                $context->msg( 'log-fulllog' )->escaped(),
                                array(),
                                $urlParam
                        );
                }

                if ( $logBody && $msgKey[0] ) {
                        $s .= '</div>';
                }

                if ( $wrap != '' ) { // Wrap message in html
                        $s = str_replace( '$1', $s, $wrap );
                }

                /* hook can return false, if we don't want the message to be emitted (Wikia BugId:7093) */
                if ( Hooks::run( 'LogEventsListShowLogExtract', array( &$s, $types, $page, $user, $param ) ) ) {
                        // $out can be either an OutputPage object or a String-by-reference
                        if ( $out instanceof OutputPage ) {
                                $out->addHTML( $s );
                        } else {
                                $out = $s;
                        }
                }

                return $numRows;
        }

        /**
         * SQL clause to skip forbidden log types for this user
         *
         * @param IDatabase $db
         * @param string $audience Public/user
         * @param User $user User to check, or null to use $wgUser
         * @return string|bool String on success, false on failure.
         */
        public static function getExcludeClause( $db, $audience = 'public', User $user = null ) {
                global $wgLogRestrictions;

                if ( $audience != 'public' && $user === null ) {
                        global $wgUser;
                        $user = $wgUser;
                }

                // Reset the array, clears extra "where" clauses when $par is used
                $hiddenLogs = array();

                // Don't show private logs to unprivileged users
                foreach ( $wgLogRestrictions as $logType => $right ) {
                        if ( $audience == 'public' || !$user->isAllowed( $right ) ) {
                                $hiddenLogs[] = $logType;
                        }
                }
                if ( count( $hiddenLogs ) == 1 ) {
                        return 'log_type != ' . $db->addQuotes( $hiddenLogs[0] );
                } elseif ( $hiddenLogs ) {
                        return 'log_type NOT IN (' . $db->makeList( $hiddenLogs ) . ')';
                }

                return false;
        }
}