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

<?php
/**
 * Created on Oct 3, 2014
 *
 * Copyright © 2014 Brad Jorsch "bjorsch@wikimedia.org"
 *
 * Heavily based on ApiQueryDeletedrevs,
 * Copyright © 2007 Roan Kattouw "<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
 */

/**
 * Query module to enumerate all deleted revisions.
 *
 * @ingroup API
 */
class ApiQueryAllDeletedRevisions extends ApiQueryRevisionsBase {

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

        /**
         * @param ApiPageSet $resultPageSet
         * @return void
         */
        protected function run( ApiPageSet $resultPageSet = null ) {
                $user = $this->getUser();
                // Before doing anything at all, let's check permissions
                if ( !$user->isAllowed( 'deletedhistory' ) ) {
                        $this->dieUsage(
                                'You don\'t have permission to view deleted revision information',
                                'permissiondenied'
                        );
                }

                $db = $this->getDB();
                $params = $this->extractRequestParams( false );

                $result = $this->getResult();

                // This module operates in two modes:
                // 'user': List deleted revs by a certain user
                // 'all': List all deleted revs in NS
                $mode = 'all';
                if ( !is_null( $params['user'] ) ) {
                        $mode = 'user';
                }

                if ( $mode == 'user' ) {
                        foreach ( array( 'from', 'to', 'prefix', 'excludeuser' ) as $param ) {
                                if ( !is_null( $params[$param] ) ) {
                                        $p = $this->getModulePrefix();
                                        $this->dieUsage( "The '{$p}{$param}' parameter cannot be used with '{$p}user'",
                                                'badparams' );
                                }
                        }
                } else {
                        foreach ( array( 'start', 'end' ) as $param ) {
                                if ( !is_null( $params[$param] ) ) {
                                        $p = $this->getModulePrefix();
                                        $this->dieUsage( "The '{$p}{$param}' parameter may only be used with '{$p}user'",
                                                'badparams' );
                                }
                        }
                }

                // If we're generating titles only, we can use DISTINCT for a better
                // query. But we can't do that in 'user' mode (wrong index), and we can
                // only do it when sorting ASC (because MySQL apparently can't use an
                // index backwards for grouping even though it can for ORDER BY, WTF?)
                $dir = $params['dir'];
                $optimizeGenerateTitles = false;
                if ( $mode === 'all' && $params['generatetitles'] && $resultPageSet !== null ) {
                        if ( $dir === 'newer' ) {
                                $optimizeGenerateTitles = true;
                        } else {
                                $p = $this->getModulePrefix();
                                $this->setWarning( "For better performance when generating titles, set {$p}dir=newer" );
                        }
                }

                $this->addTables( 'archive' );
                if ( $resultPageSet === null ) {
                        $this->parseParameters( $params );
                        $this->addFields( Revision::selectArchiveFields() );
                        $this->addFields( array( 'ar_title', 'ar_namespace' ) );
                } else {
                        $this->limit = $this->getParameter( 'limit' ) ?: 10;
                        $this->addFields( array( 'ar_title', 'ar_namespace' ) );
                        if ( $optimizeGenerateTitles ) {
                                $this->addOption( 'DISTINCT' );
                        } else {
                                $this->addFields( array( 'ar_timestamp', 'ar_rev_id', 'ar_id' ) );
                        }
                }

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

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

                if ( $this->fetchContent ) {
                        // Modern MediaWiki has the content for deleted revs in the 'text'
                        // table using fields old_text and old_flags. But revisions deleted
                        // pre-1.5 store the content in the 'archive' table directly using
                        // fields ar_text and ar_flags, and no corresponding 'text' row. So
                        // we have to LEFT JOIN and fetch all four fields.
                        $this->addTables( 'text' );
                        $this->addJoinConds(
                                array( 'text' => array( 'LEFT JOIN', array( 'ar_text_id=old_id' ) ) )
                        );
                        $this->addFields( array( 'ar_text', 'ar_flags', 'old_text', 'old_flags' ) );

                        // This also means stricter restrictions
                        if ( !$user->isAllowedAny( 'undelete', 'deletedtext' ) ) {
                                $this->dieUsage(
                                        'You don\'t have permission to view deleted revision content',
                                        'permissiondenied'
                                );
                        }
                }

                $miser_ns = null;

                if ( $mode == 'all' ) {
                        if ( $params['namespace'] !== null ) {
                                $namespaces = $params['namespace'];
                                $this->addWhereFld( 'ar_namespace', $namespaces );
                        } else {
                                $namespaces = MWNamespace::getValidNamespaces();
                        }

                        // For from/to/prefix, we have to consider the potential
                        // transformations of the title in all specified namespaces.
                        // Generally there will be only one transformation, but wikis with
                        // some namespaces case-sensitive could have two.
                        if ( $params['from'] !== null || $params['to'] !== null ) {
                                $isDirNewer = ( $dir === 'newer' );
                                $after = ( $isDirNewer ? '>=' : '<=' );
                                $before = ( $isDirNewer ? '<=' : '>=' );
                                $where = array();
                                foreach ( $namespaces as $ns ) {
                                        $w = array();
                                        if ( $params['from'] !== null ) {
                                                $w[] = 'ar_title' . $after .
                                                        $db->addQuotes( $this->titlePartToKey( $params['from'], $ns ) );
                                        }
                                        if ( $params['to'] !== null ) {
                                                $w[] = 'ar_title' . $before .
                                                        $db->addQuotes( $this->titlePartToKey( $params['to'], $ns ) );
                                        }
                                        $w = $db->makeList( $w, LIST_AND );
                                        $where[$w][] = $ns;
                                }
                                if ( count( $where ) == 1 ) {
                                        $where = key( $where );
                                        $this->addWhere( $where );
                                } else {
                                        $where2 = array();
                                        foreach ( $where as $w => $ns ) {
                                                $where2[] = $db->makeList( array( $w, 'ar_namespace' => $ns ), LIST_AND );
                                        }
                                        $this->addWhere( $db->makeList( $where2, LIST_OR ) );
                                }
                        }

                        if ( isset( $params['prefix'] ) ) {
                                $where = array();
                                foreach ( $namespaces as $ns ) {
                                        $w = 'ar_title' . $db->buildLike(
                                                $this->titlePartToKey( $params['prefix'], $ns ),
                                                $db->anyString() );
                                        $where[$w][] = $ns;
                                }
                                if ( count( $where ) == 1 ) {
                                        $where = key( $where );
                                        $this->addWhere( $where );
                                } else {
                                        $where2 = array();
                                        foreach ( $where as $w => $ns ) {
                                                $where2[] = $db->makeList( array( $w, 'ar_namespace' => $ns ), LIST_AND );
                                        }
                                        $this->addWhere( $db->makeList( $where2, LIST_OR ) );
                                }
                        }
                } else {
                        if ( $this->getConfig()->get( 'MiserMode' ) ) {
                                $miser_ns = $params['namespace'];
                        } else {
                                $this->addWhereFld( 'ar_namespace', $params['namespace'] );
                        }
                        $this->addTimestampWhereRange( 'ar_timestamp', $dir, $params['start'], $params['end'] );
                }

                if ( !is_null( $params['user'] ) ) {
                        $this->addWhereFld( 'ar_user_text', $params['user'] );
                } elseif ( !is_null( $params['excludeuser'] ) ) {
                        $this->addWhere( 'ar_user_text != ' .
                                $db->addQuotes( $params['excludeuser'] ) );
                }

                if ( !is_null( $params['user'] ) || !is_null( $params['excludeuser'] ) ) {
                        // Paranoia: avoid brute force searches (bug 17342)
                        // (shouldn't be able to get here without 'deletedhistory', but
                        // check it again just in case)
                        if ( !$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( $db->bitAnd( 'ar_deleted', $bitmask ) . " != $bitmask" );
                        }
                }

                if ( !is_null( $params['continue'] ) ) {
                        $cont = explode( '|', $params['continue'] );
                        $op = ( $dir == 'newer' ? '>' : '<' );
                        if ( $optimizeGenerateTitles ) {
                                $this->dieContinueUsageIf( count( $cont ) != 2 );
                                $ns = intval( $cont[0] );
                                $this->dieContinueUsageIf( strval( $ns ) !== $cont[0] );
                                $title = $db->addQuotes( $cont[1] );
                                $this->addWhere( "ar_namespace $op $ns OR " .
                                        "(ar_namespace = $ns AND ar_title $op= $title)" );
                        } elseif ( $mode == 'all' ) {
                                $this->dieContinueUsageIf( count( $cont ) != 4 );
                                $ns = intval( $cont[0] );
                                $this->dieContinueUsageIf( strval( $ns ) !== $cont[0] );
                                $title = $db->addQuotes( $cont[1] );
                                $ts = $db->addQuotes( $db->timestamp( $cont[2] ) );
                                $ar_id = (int)$cont[3];
                                $this->dieContinueUsageIf( strval( $ar_id ) !== $cont[3] );
                                $this->addWhere( "ar_namespace $op $ns OR " .
                                        "(ar_namespace = $ns AND " .
                                        "(ar_title $op $title OR " .
                                        "(ar_title = $title AND " .
                                        "(ar_timestamp $op $ts OR " .
                                        "(ar_timestamp = $ts AND " .
                                        "ar_id $op= $ar_id)))))" );
                        } else {
                                $this->dieContinueUsageIf( count( $cont ) != 2 );
                                $ts = $db->addQuotes( $db->timestamp( $cont[0] ) );
                                $ar_id = (int)$cont[1];
                                $this->dieContinueUsageIf( strval( $ar_id ) !== $cont[1] );
                                $this->addWhere( "ar_timestamp $op $ts OR " .
                                        "(ar_timestamp = $ts AND " .
                                        "ar_id $op= $ar_id)" );
                        }
                }

                $this->addOption( 'LIMIT', $this->limit + 1 );

                $sort = ( $dir == 'newer' ? '' : ' DESC' );
                $orderby = array();
                if ( $optimizeGenerateTitles ) {
                        // Targeting index name_title_timestamp
                        if ( $params['namespace'] === null || count( array_unique( $params['namespace'] ) ) > 1 ) {
                                $orderby[] = "ar_namespace $sort";
                        }
                        $orderby[] = "ar_title $sort";
                } elseif ( $mode == 'all' ) {
                        // Targeting index name_title_timestamp
                        if ( $params['namespace'] === null || count( array_unique( $params['namespace'] ) ) > 1 ) {
                                $orderby[] = "ar_namespace $sort";
                        }
                        $orderby[] = "ar_title $sort";
                        $orderby[] = "ar_timestamp $sort";
                        $orderby[] = "ar_id $sort";
                } else {
                        // Targeting index usertext_timestamp
                        // 'user' is always constant.
                        $orderby[] = "ar_timestamp $sort";
                        $orderby[] = "ar_id $sort";
                }
                $this->addOption( 'ORDER BY', $orderby );

                $res = $this->select( __METHOD__ );
                $pageMap = array(); // Maps ns&title to array index
                $count = 0;
                $nextIndex = 0;
                $generated = array();
                foreach ( $res as $row ) {
                        if ( ++$count > $this->limit ) {
                                // We've had enough
                                if ( $optimizeGenerateTitles ) {
                                        $this->setContinueEnumParameter( 'continue', "$row->ar_namespace|$row->ar_title" );
                                } elseif ( $mode == 'all' ) {
                                        $this->setContinueEnumParameter( 'continue',
                                                "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
                                        );
                                } else {
                                        $this->setContinueEnumParameter( 'continue', "$row->ar_timestamp|$row->ar_id" );
                                }
                                break;
                        }

                        // Miser mode namespace check
                        if ( $miser_ns !== null && !in_array( $row->ar_namespace, $miser_ns ) ) {
                                continue;
                        }

                        if ( $resultPageSet !== null ) {
                                if ( $params['generatetitles'] ) {
                                        $key = "{$row->ar_namespace}:{$row->ar_title}";
                                        if ( !isset( $generated[$key] ) ) {
                                                $generated[$key] = Title::makeTitle( $row->ar_namespace, $row->ar_title );
                                        }
                                } else {
                                        $generated[] = $row->ar_rev_id;
                                }
                        } else {
                                $revision = Revision::newFromArchiveRow( $row );
                                $rev = $this->extractRevisionInfo( $revision, $row );

                                if ( !isset( $pageMap[$row->ar_namespace][$row->ar_title] ) ) {
                                        $index = $nextIndex++;
                                        $pageMap[$row->ar_namespace][$row->ar_title] = $index;
                                        $title = $revision->getTitle();
                                        $a = array(
                                                'pageid' => $title->getArticleID(),
                                                'revisions' => array( $rev ),
                                        );
                                        ApiResult::setIndexedTagName( $a['revisions'], 'rev' );
                                        ApiQueryBase::addTitleInfo( $a, $title );
                                        $fit = $result->addValue( array( 'query', $this->getModuleName() ), $index, $a );
                                } else {
                                        $index = $pageMap[$row->ar_namespace][$row->ar_title];
                                        $fit = $result->addValue(
                                                array( 'query', $this->getModuleName(), $index, 'revisions' ),
                                                null, $rev );
                                }
                                if ( !$fit ) {
                                        if ( $mode == 'all' ) {
                                                $this->setContinueEnumParameter( 'continue',
                                                        "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
                                                );
                                        } else {
                                                $this->setContinueEnumParameter( 'continue', "$row->ar_timestamp|$row->ar_id" );
                                        }
                                        break;
                                }
                        }
                }

                if ( $resultPageSet !== null ) {
                        if ( $params['generatetitles'] ) {
                                $resultPageSet->populateFromTitles( $generated );
                        } else {
                                $resultPageSet->populateFromRevisionIDs( $generated );
                        }
                } else {
                        $result->addIndexedTagName( array( 'query', $this->getModuleName() ), 'page' );
                }
        }

        public function getAllowedParams() {
                $ret = parent::getAllowedParams() + array(
                        'user' => array(
                                ApiBase::PARAM_TYPE => 'user'
                        ),
                        'namespace' => array(
                                ApiBase::PARAM_ISMULTI => true,
                                ApiBase::PARAM_TYPE => 'namespace',
                        ),
                        'start' => array(
                                ApiBase::PARAM_TYPE => 'timestamp',
                                ApiBase::PARAM_HELP_MSG_INFO => array( array( 'useronly' ) ),
                        ),
                        'end' => array(
                                ApiBase::PARAM_TYPE => 'timestamp',
                                ApiBase::PARAM_HELP_MSG_INFO => array( array( 'useronly' ) ),
                        ),
                        'dir' => array(
                                ApiBase::PARAM_TYPE => array(
                                        'newer',
                                        'older'
                                ),
                                ApiBase::PARAM_DFLT => 'older',
                                ApiBase::PARAM_HELP_MSG => 'api-help-param-direction',
                        ),
                        'from' => array(
                                ApiBase::PARAM_HELP_MSG_INFO => array( array( 'nonuseronly' ) ),
                        ),
                        'to' => array(
                                ApiBase::PARAM_HELP_MSG_INFO => array( array( 'nonuseronly' ) ),
                        ),
                        'prefix' => array(
                                ApiBase::PARAM_HELP_MSG_INFO => array( array( 'nonuseronly' ) ),
                        ),
                        'excludeuser' => array(
                                ApiBase::PARAM_TYPE => 'user',
                                ApiBase::PARAM_HELP_MSG_INFO => array( array( 'nonuseronly' ) ),
                        ),
                        'tag' => null,
                        'continue' => array(
                                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
                        ),
                        'generatetitles' => array(
                                ApiBase::PARAM_DFLT => false
                        ),
                );

                if ( $this->getConfig()->get( 'MiserMode' ) ) {
                        $ret['user'][ApiBase::PARAM_HELP_MSG_APPEND] = array(
                                'apihelp-query+alldeletedrevisions-param-miser-user-namespace',
                        );
                        $ret['namespace'][ApiBase::PARAM_HELP_MSG_APPEND] = array(
                                'apihelp-query+alldeletedrevisions-param-miser-user-namespace',
                        );
                }

                return $ret;
        }

        protected function getExamplesMessages() {
                return array(
                        'action=query&list=alldeletedrevisions&adruser=Example&adrlimit=50'
                                => 'apihelp-query+alldeletedrevisions-example-user',
                        'action=query&list=alldeletedrevisions&adrdir=newer&adrlimit=50'
                                => 'apihelp-query+alldeletedrevisions-example-ns-main',
                );
        }

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