PHPSessionHandler: Implement SessionHandlerInterface

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

<?php
/**
 * Contain classes for dealing with individual log entries
 *
 * This is how I see the log system history:
 * - appending to plain wiki pages
 * - formatting log entries based on database fields
 * - user is now part of the action message
 *
 * 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 http://www.gnu.org/copyleft/gpl.html GNU General Public License 2.0 or later
 * @since 1.19
 */

/**
 * Interface for log entries. Every log entry has these methods.
 *
 * @since 1.19
 */
interface LogEntry {

        /**
         * The main log type.
         *
         * @return string
         */
        public function getType();

        /**
         * The log subtype.
         *
         * @return string
         */
        public function getSubtype();

        /**
         * The full logtype in format maintype/subtype.
         *
         * @return string
         */
        public function getFullType();

        /**
         * Get the extra parameters stored for this message.
         *
         * @return array
         */
        public function getParameters();

        /**
         * Get the user for performed this action.
         *
         * @return User
         */
        public function getPerformer();

        /**
         * Get the target page of this action.
         *
         * @return Title
         */
        public function getTarget();

        /**
         * Get the timestamp when the action was executed.
         *
         * @return string
         */
        public function getTimestamp();

        /**
         * Get the user provided comment.
         *
         * @return string
         */
        public function getComment();

        /**
         * Get the access restriction.
         *
         * @return string
         */
        public function getDeleted();

        /**
         * @param int $field One of LogPage::DELETED_* bitfield constants
         * @return bool
         */
        public function isDeleted( $field );
}

/**
 * Extends the LogEntryInterface with some basic functionality
 *
 * @since 1.19
 */
abstract class LogEntryBase implements LogEntry {

        public function getFullType() {
                return $this->getType() . '/' . $this->getSubtype();
        }

        public function isDeleted( $field ) {
                return ( $this->getDeleted() & $field ) === $field;
        }

        /**
         * Whether the parameters for this log are stored in new or
         * old format.
         *
         * @return bool
         */
        public function isLegacy() {
                return false;
        }

        /**
         * Create a blob from a parameter array
         *
         * @since 1.26
         * @param array $params
         * @return string
         */
        public static function makeParamBlob( $params ) {
                return serialize( (array)$params );
        }

        /**
         * Extract a parameter array from a blob
         *
         * @since 1.26
         * @param string $blob
         * @return array
         */
        public static function extractParams( $blob ) {
                return unserialize( $blob );
        }
}

/**
 * This class wraps around database result row.
 *
 * @since 1.19
 */
class DatabaseLogEntry extends LogEntryBase {

        /**
         * Returns array of information that is needed for querying
         * log entries. Array contains the following keys:
         * tables, fields, conds, options and join_conds
         *
         * @return array
         */
        public static function getSelectQueryData() {
                $tables = array( 'logging', 'user' );
                $fields = array(
                        'log_id', 'log_type', 'log_action', 'log_timestamp',
                        'log_user', 'log_user_text',
                        'log_namespace', 'log_title', // unused log_page
                        'log_comment', 'log_params', 'log_deleted',
                        'user_id', 'user_name', 'user_editcount',
                );

                $joins = array(
                        // IPs don't have an entry in user table
                        'user' => array( 'LEFT JOIN', 'log_user=user_id' ),
                );

                return array(
                        'tables' => $tables,
                        'fields' => $fields,
                        'conds' => array(),
                        'options' => array(),
                        'join_conds' => $joins,
                );
        }

        /**
         * Constructs new LogEntry from database result row.
         * Supports rows from both logging and recentchanges table.
         *
         * @param stdClass|array $row
         * @return DatabaseLogEntry
         */
        public static function newFromRow( $row ) {
                $row = (object)$row;
                if ( isset( $row->rc_logid ) ) {
                        return new RCDatabaseLogEntry( $row );
                } else {
                        return new self( $row );
                }
        }

        /** @var stdClass Database result row. */
        protected $row;

        /** @var User */
        protected $performer;

        /** @var array Parameters for log entry */
        protected $params;

        /** @var int A rev id associated to the log entry */
        protected $revId = null;

        /** @var bool Whether the parameters for this log entry are stored in new or old format. */
        protected $legacy;

        protected function __construct( $row ) {
                $this->row = $row;
        }

        /**
         * Returns the unique database id.
         *
         * @return int
         */
        public function getId() {
                return (int)$this->row->log_id;
        }

        /**
         * Returns whatever is stored in the database field.
         *
         * @return string
         */
        protected function getRawParameters() {
                return $this->row->log_params;
        }

        public function isLegacy() {
                // This extracts the property
                $this->getParameters();
                return $this->legacy;
        }

        public function getType() {
                return $this->row->log_type;
        }

        public function getSubtype() {
                return $this->row->log_action;
        }

        public function getParameters() {
                if ( !isset( $this->params ) ) {
                        $blob = $this->getRawParameters();
                        MediaWiki\suppressWarnings();
                        $params = LogEntryBase::extractParams( $blob );
                        MediaWiki\restoreWarnings();
                        if ( $params !== false ) {
                                $this->params = $params;
                                $this->legacy = false;
                        } else {
                                $this->params = LogPage::extractParams( $blob );
                                $this->legacy = true;
                        }

                        if ( isset( $this->params['associated_rev_id'] ) ) {
                                $this->revId = $this->params['associated_rev_id'];
                                unset( $this->params['associated_rev_id'] );
                        }
                }

                return $this->params;
        }

        public function getAssociatedRevId() {
                // This extracts the property
                $this->getParameters();
                return $this->revId;
        }

        public function getPerformer() {
                if ( !$this->performer ) {
                        $userId = (int)$this->row->log_user;
                        if ( $userId !== 0 ) {
                                // logged-in users
                                if ( isset( $this->row->user_name ) ) {
                                        $this->performer = User::newFromRow( $this->row );
                                } else {
                                        $this->performer = User::newFromId( $userId );
                                }
                        } else {
                                // IP users
                                $userText = $this->row->log_user_text;
                                $this->performer = User::newFromName( $userText, false );
                        }
                }

                return $this->performer;
        }

        public function getTarget() {
                $namespace = $this->row->log_namespace;
                $page = $this->row->log_title;
                $title = Title::makeTitle( $namespace, $page );

                return $title;
        }

        public function getTimestamp() {
                return wfTimestamp( TS_MW, $this->row->log_timestamp );
        }

        public function getComment() {
                return $this->row->log_comment;
        }

        public function getDeleted() {
                return $this->row->log_deleted;
        }
}

class RCDatabaseLogEntry extends DatabaseLogEntry {

        public function getId() {
                return $this->row->rc_logid;
        }

        protected function getRawParameters() {
                return $this->row->rc_params;
        }

        public function getAssociatedRevId() {
                return $this->row->rc_this_oldid;
        }

        public function getType() {
                return $this->row->rc_log_type;
        }

        public function getSubtype() {
                return $this->row->rc_log_action;
        }

        public function getPerformer() {
                if ( !$this->performer ) {
                        $userId = (int)$this->row->rc_user;
                        if ( $userId !== 0 ) {
                                $this->performer = User::newFromId( $userId );
                        } else {
                                $userText = $this->row->rc_user_text;
                                // Might be an IP, don't validate the username
                                $this->performer = User::newFromName( $userText, false );
                        }
                }

                return $this->performer;
        }

        public function getTarget() {
                $namespace = $this->row->rc_namespace;
                $page = $this->row->rc_title;
                $title = Title::makeTitle( $namespace, $page );

                return $title;
        }

        public function getTimestamp() {
                return wfTimestamp( TS_MW, $this->row->rc_timestamp );
        }

        public function getComment() {
                return $this->row->rc_comment;
        }

        public function getDeleted() {
                return $this->row->rc_deleted;
        }
}

/**
 * Class for creating log entries manually, to inject them into the database.
 *
 * @since 1.19
 */
class ManualLogEntry extends LogEntryBase {
        /** @var string Type of log entry */
        protected $type;

        /** @var string Sub type of log entry */
        protected $subtype;

        /** @var array Parameters for log entry */
        protected $parameters = array();

        /** @var array */
        protected $relations = array();

        /** @var User Performer of the action for the log entry */
        protected $performer;

        /** @var Title Target title for the log entry */
        protected $target;

        /** @var string Timestamp of creation of the log entry */
        protected $timestamp;

        /** @var string Comment for the log entry */
        protected $comment = '';

        /** @var int A rev id associated to the log entry */
        protected $revId = 0;

        /** @var int Deletion state of the log entry */
        protected $deleted;

        /** @var int ID of the log entry */
        protected $id;

        /** @var bool Whether this is a legacy log entry */
        protected $legacy = false;

        /**
         * Constructor.
         *
         * @since 1.19
         * @param string $type
         * @param string $subtype
         */
        public function __construct( $type, $subtype ) {
                $this->type = $type;
                $this->subtype = $subtype;
        }

        /**
         * Set extra log parameters.
         *
         * You can pass params to the log action message by prefixing the keys with
         * a number and optional type, using colons to separate the fields. The
         * numbering should start with number 4, the first three parameters are
         * hardcoded for every message.
         *
         * If you want to store stuff that should not be available in messages, don't
         * prefix the array key with a number and don't use the colons.
         *
         * Example:
         *   $entry->setParameters(
         *     '4::color' => 'blue',
         *     '5:number:count' => 3000,
         *     'animal' => 'dog'
         *   );
         *
         * @since 1.19
         * @param array $parameters Associative array
         */
        public function setParameters( $parameters ) {
                $this->parameters = $parameters;
        }

        /**
         * Declare arbitrary tag/value relations to this log entry.
         * These can be used to filter log entries later on.
         *
         * @param array $relations Map of (tag => (list of values|value))
         * @since 1.22
         */
        public function setRelations( array $relations ) {
                $this->relations = $relations;
        }

        /**
         * Set the user that performed the action being logged.
         *
         * @since 1.19
         * @param User $performer
         */
        public function setPerformer( User $performer ) {
                $this->performer = $performer;
        }

        /**
         * Set the title of the object changed.
         *
         * @since 1.19
         * @param Title $target
         */
        public function setTarget( Title $target ) {
                $this->target = $target;
        }

        /**
         * Set the timestamp of when the logged action took place.
         *
         * @since 1.19
         * @param string $timestamp
         */
        public function setTimestamp( $timestamp ) {
                $this->timestamp = $timestamp;
        }

        /**
         * Set a comment associated with the action being logged.
         *
         * @since 1.19
         * @param string $comment
         */
        public function setComment( $comment ) {
                $this->comment = $comment;
        }

        /**
         * Set an associated revision id.
         *
         * For example, the ID of the revision that was inserted to mark a page move
         * or protection, file upload, etc.
         *
         * @since 1.27
         * @param int $revId
         */
        public function setAssociatedRevId( $revId ) {
                $this->revId = $revId;
        }

        /**
         * Set the 'legacy' flag
         *
         * @since 1.25
         * @param bool $legacy
         */
        public function setLegacy( $legacy ) {
                $this->legacy = $legacy;
        }

        /**
         * Set the 'deleted' flag.
         *
         * @since 1.19
         * @param int $deleted One of LogPage::DELETED_* bitfield constants
         */
        public function setDeleted( $deleted ) {
                $this->deleted = $deleted;
        }

        /**
         * Insert the entry into the `logging` table.
         *
         * @param IDatabase $dbw
         * @return int ID of the log entry
         * @throws MWException
         */
        public function insert( IDatabase $dbw = null ) {
                global $wgContLang;

                $dbw = $dbw ?: wfGetDB( DB_MASTER );
                $id = $dbw->nextSequenceValue( 'logging_log_id_seq' );

                if ( $this->timestamp === null ) {
                        $this->timestamp = wfTimestampNow();
                }

                // Trim spaces on user supplied text
                $comment = trim( $this->getComment() );

                // Truncate for whole multibyte characters.
                $comment = $wgContLang->truncate( $comment, 255 );

                $params = $this->getParameters();
                $relations = $this->relations;

                // Additional fields for which there's no space in the database table schema
                $revId = $this->getAssociatedRevId();
                if ( $revId ) {
                        $params['associated_rev_id'] = $revId;
                        $relations['associated_rev_id'] = $revId;
                }

                $data = array(
                        'log_id' => $id,
                        'log_type' => $this->getType(),
                        'log_action' => $this->getSubtype(),
                        'log_timestamp' => $dbw->timestamp( $this->getTimestamp() ),
                        'log_user' => $this->getPerformer()->getId(),
                        'log_user_text' => $this->getPerformer()->getName(),
                        'log_namespace' => $this->getTarget()->getNamespace(),
                        'log_title' => $this->getTarget()->getDBkey(),
                        'log_page' => $this->getTarget()->getArticleID(),
                        'log_comment' => $comment,
                        'log_params' => LogEntryBase::makeParamBlob( $params ),
                );
                if ( isset( $this->deleted ) ) {
                        $data['log_deleted'] = $this->deleted;
                }

                $dbw->insert( 'logging', $data, __METHOD__ );
                $this->id = !is_null( $id ) ? $id : $dbw->insertId();

                $rows = array();
                foreach ( $relations as $tag => $values ) {
                        if ( !strlen( $tag ) ) {
                                throw new MWException( "Got empty log search tag." );
                        }

                        if ( !is_array( $values ) ) {
                                $values = array( $values );
                        }

                        foreach ( $values as $value ) {
                                $rows[] = array(
                                        'ls_field' => $tag,
                                        'ls_value' => $value,
                                        'ls_log_id' => $this->id
                                );
                        }
                }
                if ( count( $rows ) ) {
                        $dbw->insert( 'log_search', $rows, __METHOD__, 'IGNORE' );
                }

                return $this->id;
        }

        /**
         * Get a RecentChanges object for the log entry
         *
         * @param int $newId
         * @return RecentChange
         * @since 1.23
         */
        public function getRecentChange( $newId = 0 ) {
                $formatter = LogFormatter::newFromEntry( $this );
                $context = RequestContext::newExtraneousContext( $this->getTarget() );
                $formatter->setContext( $context );

                $logpage = SpecialPage::getTitleFor( 'Log', $this->getType() );
                $user = $this->getPerformer();
                $ip = "";
                if ( $user->isAnon() ) {
                        // "MediaWiki default" and friends may have
                        // no IP address in their name
                        if ( IP::isIPAddress( $user->getName() ) ) {
                                $ip = $user->getName();
                        }
                }

                return RecentChange::newLogEntry(
                        $this->getTimestamp(),
                        $logpage,
                        $user,
                        $formatter->getPlainActionText(),
                        $ip,
                        $this->getType(),
                        $this->getSubtype(),
                        $this->getTarget(),
                        $this->getComment(),
                        LogEntryBase::makeParamBlob( $this->getParameters() ),
                        $newId,
                        $formatter->getIRCActionComment(), // Used for IRC feeds
                        $this->getAssociatedRevId() // Used for e.g. moves and uploads
                );
        }

        /**
         * Publish the log entry.
         *
         * @param int $newId Id of the log entry.
         * @param string $to One of: rcandudp (default), rc, udp
         * @return RecentChange|null
         */
        public function publish( $newId, $to = 'rcandudp' ) {
                $log = new LogPage( $this->getType() );
                if ( $log->isRestricted() ) {
                        return null;
                }

                $rc = $this->getRecentChange( $newId );

                if ( $to === 'rc' || $to === 'rcandudp' ) {
                        $rc->save( 'pleasedontudp' );
                }

                if ( $to === 'udp' || $to === 'rcandudp' ) {
                        $rc->notifyRCFeeds();
                }

                // Log the autopatrol if an associated rev id was passed
                if ( $this->getAssociatedRevId() > 0 &&
                        $rc->getAttribute( 'rc_patrolled' ) === 1 ) {
                        PatrolLog::record( $rc, true, $this->getPerformer() );
                }

                return $rc;
        }

        public function getType() {
                return $this->type;
        }

        public function getSubtype() {
                return $this->subtype;
        }

        public function getParameters() {
                return $this->parameters;
        }

        /**
         * @return User
         */
        public function getPerformer() {
                return $this->performer;
        }

        /**
         * @return Title
         */
        public function getTarget() {
                return $this->target;
        }

        public function getTimestamp() {
                $ts = $this->timestamp !== null ? $this->timestamp : wfTimestampNow();

                return wfTimestamp( TS_MW, $ts );
        }

        public function getComment() {
                return $this->comment;
        }

        /**
         * @since 1.27
         * @return int
         */
        public function getAssociatedRevId() {
                return $this->revId;
        }

        /**
         * @since 1.25
         * @return bool
         */
        public function isLegacy() {
                return $this->legacy;
        }

        public function getDeleted() {
                return (int)$this->deleted;
        }
}