PHPSessionHandler: Implement SessionHandlerInterface

[mediawiki.git] / includes / api / ApiQueryUserContributions.php

<?php
/**
 *
 *
 * Created on Oct 16, 2006
 *
 * Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
 *
 * 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
 */

/**
 * This query action adds a list of a specified user's contributions to the output.
 *
 * @ingroup API
 */
class ApiQueryContributions extends ApiQueryBase {

        public function __construct( ApiQuery $query, $moduleName ) {
                parent::__construct( $query, $moduleName, 'uc' );
        }

        private $params, $prefixMode, $userprefix, $multiUserMode, $usernames, $parentLens;
        private $fld_ids = false, $fld_title = false, $fld_timestamp = false,
                $fld_comment = false, $fld_parsedcomment = false, $fld_flags = false,
                $fld_patrolled = false, $fld_tags = false, $fld_size = false, $fld_sizediff = false;

        public function execute() {
                // Parse some parameters
                $this->params = $this->extractRequestParams();

                $prop = array_flip( $this->params['prop'] );
                $this->fld_ids = isset( $prop['ids'] );
                $this->fld_title = isset( $prop['title'] );
                $this->fld_comment = isset( $prop['comment'] );
                $this->fld_parsedcomment = isset( $prop['parsedcomment'] );
                $this->fld_size = isset( $prop['size'] );
                $this->fld_sizediff = isset( $prop['sizediff'] );
                $this->fld_flags = isset( $prop['flags'] );
                $this->fld_timestamp = isset( $prop['timestamp'] );
                $this->fld_patrolled = isset( $prop['patrolled'] );
                $this->fld_tags = isset( $prop['tags'] );

                // Most of this code will use the 'contributions' group DB, which can map to slaves
                // with extra user based indexes or partioning by user. The additional metadata
                // queries should use a regular slave since the lookup pattern is not all by user.
                $dbSecondary = $this->getDB(); // any random slave

                // TODO: if the query is going only against the revision table, should this be done?
                $this->selectNamedDB( 'contributions', DB_SLAVE, 'contributions' );

                if ( isset( $this->params['userprefix'] ) ) {
                        $this->prefixMode = true;
                        $this->multiUserMode = true;
                        $this->userprefix = $this->params['userprefix'];
                } else {
                        $this->usernames = array();
                        if ( !is_array( $this->params['user'] ) ) {
                                $this->params['user'] = array( $this->params['user'] );
                        }
                        if ( !count( $this->params['user'] ) ) {
                                $this->dieUsage( 'User parameter may not be empty.', 'param_user' );
                        }
                        foreach ( $this->params['user'] as $u ) {
                                $this->prepareUsername( $u );
                        }
                        $this->prefixMode = false;
                        $this->multiUserMode = ( count( $this->params['user'] ) > 1 );
                }

                $this->prepareQuery();

                // Do the actual query.
                $res = $this->select( __METHOD__ );

                if ( $this->fld_sizediff ) {
                        $revIds = array();
                        foreach ( $res as $row ) {
                                if ( $row->rev_parent_id ) {
                                        $revIds[] = $row->rev_parent_id;
                                }
                        }
                        $this->parentLens = Revision::getParentLengths( $dbSecondary, $revIds );
                        $res->rewind(); // reset
                }

                // Initialise some variables
                $count = 0;
                $limit = $this->params['limit'];

                // Fetch each row
                foreach ( $res as $row ) {
                        if ( ++$count > $limit ) {
                                // We've reached the one extra which shows that there are
                                // additional pages to be had. Stop here...
                                $this->setContinueEnumParameter( 'continue', $this->continueStr( $row ) );
                                break;
                        }

                        $vals = $this->extractRowInfo( $row );
                        $fit = $this->getResult()->addValue( array( 'query', $this->getModuleName() ), null, $vals );
                        if ( !$fit ) {
                                $this->setContinueEnumParameter( 'continue', $this->continueStr( $row ) );
                                break;
                        }
                }

                $this->getResult()->addIndexedTagName(
                        array( 'query', $this->getModuleName() ),
                        'item'
                );
        }

        /**
         * Validate the 'user' parameter and set the value to compare
         * against `revision`.`rev_user_text`
         *
         * @param string $user
         */
        private function prepareUsername( $user ) {
                if ( !is_null( $user ) && $user !== '' ) {
                        $name = User::isIP( $user )
                                ? $user
                                : User::getCanonicalName( $user, 'valid' );
                        if ( $name === false ) {
                                $this->dieUsage( "User name {$user} is not valid", 'param_user' );
                        } else {
                                $this->usernames[] = $name;
                        }
                } else {
                        $this->dieUsage( 'User parameter may not be empty', 'param_user' );
                }
        }

        /**
         * Prepares the query and returns the limit of rows requested
         */
        private function prepareQuery() {
                // We're after the revision table, and the corresponding page
                // row for anything we retrieve. We may also need the
                // recentchanges row and/or tag summary row.
                $user = $this->getUser();
                $tables = array( 'page', 'revision' ); // Order may change
                $this->addWhere( 'page_id=rev_page' );

                // Handle continue parameter
                if ( !is_null( $this->params['continue'] ) ) {
                        $continue = explode( '|', $this->params['continue'] );
                        $db = $this->getDB();
                        if ( $this->multiUserMode ) {
                                $this->dieContinueUsageIf( count( $continue ) != 3 );
                                $encUser = $db->addQuotes( array_shift( $continue ) );
                        } else {
                                $this->dieContinueUsageIf( count( $continue ) != 2 );
                        }
                        $encTS = $db->addQuotes( $db->timestamp( $continue[0] ) );
                        $encId = (int)$continue[1];
                        $this->dieContinueUsageIf( $encId != $continue[1] );
                        $op = ( $this->params['dir'] == 'older' ? '<' : '>' );
                        if ( $this->multiUserMode ) {
                                $this->addWhere(
                                        "rev_user_text $op $encUser OR " .
                                        "(rev_user_text = $encUser AND " .
                                        "(rev_timestamp $op $encTS OR " .
                                        "(rev_timestamp = $encTS AND " .
                                        "rev_id $op= $encId)))"
                                );
                        } else {
                                $this->addWhere(
                                        "rev_timestamp $op $encTS OR " .
                                        "(rev_timestamp = $encTS AND " .
                                        "rev_id $op= $encId)"
                                );
                        }
                }

                // Don't include any revisions where we're not supposed to be able to
                // see the username.
                if ( !$user->isAllowed( 'deletedhistory' ) ) {
                        $bitmask = Revision::DELETED_USER;
                } elseif ( !$user->isAllowedAny( 'suppressrevision', 'viewsuppressed' ) ) {
                        $bitmask = Revision::DELETED_USER | Revision::DELETED_RESTRICTED;
                } else {
                        $bitmask = 0;
                }
                if ( $bitmask ) {
                        $this->addWhere( $this->getDB()->bitAnd( 'rev_deleted', $bitmask ) . " != $bitmask" );
                }

                // We only want pages by the specified users.
                if ( $this->prefixMode ) {
                        $this->addWhere( 'rev_user_text' .
                                $this->getDB()->buildLike( $this->userprefix, $this->getDB()->anyString() ) );
                } else {
                        $this->addWhereFld( 'rev_user_text', $this->usernames );
                }
                // ... and in the specified timeframe.
                // Ensure the same sort order for rev_user_text and rev_timestamp
                // so our query is indexed
                if ( $this->multiUserMode ) {
                        $this->addWhereRange( 'rev_user_text', $this->params['dir'], null, null );
                }
                $this->addTimestampWhereRange( 'rev_timestamp',
                        $this->params['dir'], $this->params['start'], $this->params['end'] );
                // Include in ORDER BY for uniqueness
                $this->addWhereRange( 'rev_id', $this->params['dir'], null, null );

                $this->addWhereFld( 'page_namespace', $this->params['namespace'] );

                $show = $this->params['show'];
                if ( $this->params['toponly'] ) { // deprecated/old param
                        $show[] = 'top';
                }
                if ( !is_null( $show ) ) {
                        $show = array_flip( $show );

                        if ( ( isset( $show['minor'] ) && isset( $show['!minor'] ) )
                                || ( isset( $show['patrolled'] ) && isset( $show['!patrolled'] ) )
                                || ( isset( $show['top'] ) && isset( $show['!top'] ) )
                                || ( isset( $show['new'] ) && isset( $show['!new'] ) )
                        ) {
                                $this->dieUsageMsg( 'show' );
                        }

                        $this->addWhereIf( 'rev_minor_edit = 0', isset( $show['!minor'] ) );
                        $this->addWhereIf( 'rev_minor_edit != 0', isset( $show['minor'] ) );
                        $this->addWhereIf( 'rc_patrolled = 0', isset( $show['!patrolled'] ) );
                        $this->addWhereIf( 'rc_patrolled != 0', isset( $show['patrolled'] ) );
                        $this->addWhereIf( 'rev_id != page_latest', isset( $show['!top'] ) );
                        $this->addWhereIf( 'rev_id = page_latest', isset( $show['top'] ) );
                        $this->addWhereIf( 'rev_parent_id != 0', isset( $show['!new'] ) );
                        $this->addWhereIf( 'rev_parent_id = 0', isset( $show['new'] ) );
                }
                $this->addOption( 'LIMIT', $this->params['limit'] + 1 );
                $index = array( 'revision' => 'usertext_timestamp' );

                // Mandatory fields: timestamp allows request continuation
                // ns+title checks if the user has access rights for this page
                // user_text is necessary if multiple users were specified
                $this->addFields( array(
                        'rev_id',
                        'rev_timestamp',
                        'page_namespace',
                        'page_title',
                        'rev_user',
                        'rev_user_text',
                        'rev_deleted'
                ) );

                if ( isset( $show['patrolled'] ) || isset( $show['!patrolled'] ) ||
                        $this->fld_patrolled
                ) {
                        if ( !$user->useRCPatrol() && !$user->useNPPatrol() ) {
                                $this->dieUsage(
                                        'You need the patrol right to request the patrolled flag',
                                        'permissiondenied'
                                );
                        }

                        // Use a redundant join condition on both
                        // timestamp and ID so we can use the timestamp
                        // index
                        $index['recentchanges'] = 'rc_user_text';
                        if ( isset( $show['patrolled'] ) || isset( $show['!patrolled'] ) ) {
                                // Put the tables in the right order for
                                // STRAIGHT_JOIN
                                $tables = array( 'revision', 'recentchanges', 'page' );
                                $this->addOption( 'STRAIGHT_JOIN' );
                                $this->addWhere( 'rc_user_text=rev_user_text' );
                                $this->addWhere( 'rc_timestamp=rev_timestamp' );
                                $this->addWhere( 'rc_this_oldid=rev_id' );
                        } else {
                                $tables[] = 'recentchanges';
                                $this->addJoinConds( array( 'recentchanges' => array(
                                        'LEFT JOIN', array(
                                                'rc_user_text=rev_user_text',
                                                'rc_timestamp=rev_timestamp',
                                                'rc_this_oldid=rev_id' ) ) ) );
                        }
                }

                $this->addTables( $tables );
                $this->addFieldsIf( 'rev_page', $this->fld_ids );
                $this->addFieldsIf( 'page_latest', $this->fld_flags );
                // $this->addFieldsIf( 'rev_text_id', $this->fld_ids ); // Should this field be exposed?
                $this->addFieldsIf( 'rev_comment', $this->fld_comment || $this->fld_parsedcomment );
                $this->addFieldsIf( 'rev_len', $this->fld_size || $this->fld_sizediff );
                $this->addFieldsIf( 'rev_minor_edit', $this->fld_flags );
                $this->addFieldsIf( 'rev_parent_id', $this->fld_flags || $this->fld_sizediff || $this->fld_ids );
                $this->addFieldsIf( 'rc_patrolled', $this->fld_patrolled );

                if ( $this->fld_tags ) {
                        $this->addTables( 'tag_summary' );
                        $this->addJoinConds(
                                array( 'tag_summary' => array( 'LEFT JOIN', array( 'rev_id=ts_rev_id' ) ) )
                        );
                        $this->addFields( 'ts_tags' );
                }

                if ( isset( $this->params['tag'] ) ) {
                        $this->addTables( 'change_tag' );
                        $this->addJoinConds(
                                array( 'change_tag' => array( 'INNER JOIN', array( 'rev_id=ct_rev_id' ) ) )
                        );
                        $this->addWhereFld( 'ct_tag', $this->params['tag'] );
                }

                $this->addOption( 'USE INDEX', $index );
        }

        /**
         * Extract fields from the database row and append them to a result array
         *
         * @param stdClass $row
         * @return array
         */
        private function extractRowInfo( $row ) {
                $vals = array();
                $anyHidden = false;

                if ( $row->rev_deleted & Revision::DELETED_TEXT ) {
                        $vals['texthidden'] = true;
                        $anyHidden = true;
                }

                // Any rows where we can't view the user were filtered out in the query.
                $vals['userid'] = (int)$row->rev_user;
                $vals['user'] = $row->rev_user_text;
                if ( $row->rev_deleted & Revision::DELETED_USER ) {
                        $vals['userhidden'] = true;
                        $anyHidden = true;
                }
                if ( $this->fld_ids ) {
                        $vals['pageid'] = intval( $row->rev_page );
                        $vals['revid'] = intval( $row->rev_id );
                        // $vals['textid'] = intval( $row->rev_text_id ); // todo: Should this field be exposed?

                        if ( !is_null( $row->rev_parent_id ) ) {
                                $vals['parentid'] = intval( $row->rev_parent_id );
                        }
                }

                $title = Title::makeTitle( $row->page_namespace, $row->page_title );

                if ( $this->fld_title ) {
                        ApiQueryBase::addTitleInfo( $vals, $title );
                }

                if ( $this->fld_timestamp ) {
                        $vals['timestamp'] = wfTimestamp( TS_ISO_8601, $row->rev_timestamp );
                }

                if ( $this->fld_flags ) {
                        $vals['new'] = $row->rev_parent_id == 0 && !is_null( $row->rev_parent_id );
                        $vals['minor'] = (bool)$row->rev_minor_edit;
                        $vals['top'] = $row->page_latest == $row->rev_id;
                }

                if ( ( $this->fld_comment || $this->fld_parsedcomment ) && isset( $row->rev_comment ) ) {
                        if ( $row->rev_deleted & Revision::DELETED_COMMENT ) {
                                $vals['commenthidden'] = true;
                                $anyHidden = true;
                        }

                        $userCanView = Revision::userCanBitfield(
                                $row->rev_deleted,
                                Revision::DELETED_COMMENT, $this->getUser()
                        );

                        if ( $userCanView ) {
                                if ( $this->fld_comment ) {
                                        $vals['comment'] = $row->rev_comment;
                                }

                                if ( $this->fld_parsedcomment ) {
                                        $vals['parsedcomment'] = Linker::formatComment( $row->rev_comment, $title );
                                }
                        }
                }

                if ( $this->fld_patrolled ) {
                        $vals['patrolled'] = (bool)$row->rc_patrolled;
                }

                if ( $this->fld_size && !is_null( $row->rev_len ) ) {
                        $vals['size'] = intval( $row->rev_len );
                }

                if ( $this->fld_sizediff
                        && !is_null( $row->rev_len )
                        && !is_null( $row->rev_parent_id )
                ) {
                        $parentLen = isset( $this->parentLens[$row->rev_parent_id] )
                                ? $this->parentLens[$row->rev_parent_id]
                                : 0;
                        $vals['sizediff'] = intval( $row->rev_len - $parentLen );
                }

                if ( $this->fld_tags ) {
                        if ( $row->ts_tags ) {
                                $tags = explode( ',', $row->ts_tags );
                                ApiResult::setIndexedTagName( $tags, 'tag' );
                                $vals['tags'] = $tags;
                        } else {
                                $vals['tags'] = array();
                        }
                }

                if ( $anyHidden && $row->rev_deleted & Revision::DELETED_RESTRICTED ) {
                        $vals['suppressed'] = true;
                }

                return $vals;
        }

        private function continueStr( $row ) {
                if ( $this->multiUserMode ) {
                        return "$row->rev_user_text|$row->rev_timestamp|$row->rev_id";
                } else {
                        return "$row->rev_timestamp|$row->rev_id";
                }
        }

        public function getCacheMode( $params ) {
                // This module provides access to deleted revisions and patrol flags if
                // the requester is logged in
                return 'anon-public-user-private';
        }

        public function getAllowedParams() {
                return array(
                        'limit' => array(
                                ApiBase::PARAM_DFLT => 10,
                                ApiBase::PARAM_TYPE => 'limit',
                                ApiBase::PARAM_MIN => 1,
                                ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
                                ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
                        ),
                        'start' => array(
                                ApiBase::PARAM_TYPE => 'timestamp'
                        ),
                        'end' => array(
                                ApiBase::PARAM_TYPE => 'timestamp'
                        ),
                        'continue' => array(
                                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
                        ),
                        'user' => array(
                                ApiBase::PARAM_TYPE => 'user',
                                ApiBase::PARAM_ISMULTI => true
                        ),
                        'userprefix' => null,
                        'dir' => array(
                                ApiBase::PARAM_DFLT => 'older',
                                ApiBase::PARAM_TYPE => array(
                                        'newer',
                                        'older'
                                ),
                                ApiBase::PARAM_HELP_MSG => 'api-help-param-direction',
                        ),
                        'namespace' => array(
                                ApiBase::PARAM_ISMULTI => true,
                                ApiBase::PARAM_TYPE => 'namespace'
                        ),
                        'prop' => array(
                                ApiBase::PARAM_ISMULTI => true,
                                ApiBase::PARAM_DFLT => 'ids|title|timestamp|comment|size|flags',
                                ApiBase::PARAM_TYPE => array(
                                        'ids',
                                        'title',
                                        'timestamp',
                                        'comment',
                                        'parsedcomment',
                                        'size',
                                        'sizediff',
                                        'flags',
                                        'patrolled',
                                        'tags'
                                ),
                                ApiBase::PARAM_HELP_MSG_PER_VALUE => array(),
                        ),
                        'show' => array(
                                ApiBase::PARAM_ISMULTI => true,
                                ApiBase::PARAM_TYPE => array(
                                        'minor',
                                        '!minor',
                                        'patrolled',
                                        '!patrolled',
                                        'top',
                                        '!top',
                                        'new',
                                        '!new',
                                ),
                                ApiBase::PARAM_HELP_MSG => array(
                                        'apihelp-query+usercontribs-param-show',
                                        $this->getConfig()->get( 'RCMaxAge' )
                                ),
                        ),
                        'tag' => null,
                        'toponly' => array(
                                ApiBase::PARAM_DFLT => false,
                                ApiBase::PARAM_DEPRECATED => true,
                        ),
                );
        }

        protected function getExamplesMessages() {
                return array(
                        'action=query&list=usercontribs&ucuser=Example'
                                => 'apihelp-query+usercontribs-example-user',
                        'action=query&list=usercontribs&ucuserprefix=192.0.2.'
                                => 'apihelp-query+usercontribs-example-ipprefix',
                );
        }

        public function getHelpUrls() {
                return 'https://www.mediawiki.org/wiki/API:Usercontribs';
        }
}