ApiQueryDeletedRevisions.php

Go to the documentation of this file.

<?php
class ApiQueryDeletedRevisions extends ApiQueryRevisionsBase {

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

    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'
            );
        }

        $pageSet = $this->getPageSet();
        $pageMap = $pageSet->getGoodAndMissingTitlesByNamespace();
        $pageCount = count( $pageSet->getGoodAndMissingTitles() );
        $revCount = $pageSet->getRevisionCount();
        if ( $revCount === 0 && $pageCount === 0 ) {
            // Nothing to do
            return;
        }
        if ( $revCount !== 0 && count( $pageSet->getDeletedRevisionIDs() ) === 0 ) {
            // Nothing to do, revisions were supplied but none are deleted
            return;
        }

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

        $db = $this->getDB();

        if ( !is_null( $params['user'] ) && !is_null( $params['excludeuser'] ) ) {
            $this->dieUsage( 'user and excludeuser cannot be used together', 'badparams' );
        }

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

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

        if ( !is_null( $params['tag'] ) ) {
            $this->addTables( 'change_tag' );
            $this->addJoinConds(
                [ 'change_tag' => [ 'INNER JOIN', [ '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(
                [ 'text' => [ 'LEFT JOIN', [ 'ar_text_id=old_id' ] ] ]
            );
            $this->addFields( [ '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'
                );
            }
        }

        $dir = $params['dir'];

        if ( $revCount !== 0 ) {
            $this->addWhere( [
                'ar_rev_id' => array_keys( $pageSet->getDeletedRevisionIDs() )
            ] );
        } else {
            // We need a custom WHERE clause that matches all titles.
            $lb = new LinkBatch( $pageSet->getGoodAndMissingTitles() );
            $where = $lb->constructSet( 'ar', $db );
            $this->addWhere( $where );
        }

        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 ( $revCount !== 0 ) {
                $this->dieContinueUsageIf( count( $cont ) != 2 );
                $rev = intval( $cont[0] );
                $this->dieContinueUsageIf( strval( $rev ) !== $cont[0] );
                $ar_id = (int)$cont[1];
                $this->dieContinueUsageIf( strval( $ar_id ) !== $cont[1] );
                $this->addWhere( "ar_rev_id $op $rev OR " .
                    "(ar_rev_id = $rev AND " .
                    "ar_id $op= $ar_id)" );
            } else {
                $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)))))" );
            }
        }

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

        if ( $revCount !== 0 ) {
            // Sort by ar_rev_id when querying by ar_rev_id
            $this->addWhereRange( 'ar_rev_id', $dir, null, null );
        } else {
            // Sort by ns and title in the same order as timestamp for efficiency
            // But only when not already unique in the query
            if ( count( $pageMap ) > 1 ) {
                $this->addWhereRange( 'ar_namespace', $dir, null, null );
            }
            $oneTitle = key( reset( $pageMap ) );
            foreach ( $pageMap as $pages ) {
                if ( count( $pages ) > 1 || key( $pages ) !== $oneTitle ) {
                    $this->addWhereRange( 'ar_title', $dir, null, null );
                    break;
                }
            }
            $this->addTimestampWhereRange( 'ar_timestamp', $dir, $params['start'], $params['end'] );
        }
        // Include in ORDER BY for uniqueness
        $this->addWhereRange( 'ar_id', $dir, null, null );

        $res = $this->select( __METHOD__ );
        $count = 0;
        $generated = [];
        foreach ( $res as $row ) {
            if ( ++$count > $this->limit ) {
                // We've had enough
                $this->setContinueEnumParameter( 'continue',
                    $revCount
                        ? "$row->ar_rev_id|$row->ar_id"
                        : "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
                );
                break;
            }

            if ( $resultPageSet !== null ) {
                $generated[] = $row->ar_rev_id;
            } else {
                if ( !isset( $pageMap[$row->ar_namespace][$row->ar_title] ) ) {
                    // Was it converted?
                    $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
                    $converted = $pageSet->getConvertedTitles();
                    if ( $title && isset( $converted[$title->getPrefixedText()] ) ) {
                        $title = Title::newFromText( $converted[$title->getPrefixedText()] );
                        if ( $title && isset( $pageMap[$title->getNamespace()][$title->getDBkey()] ) ) {
                            $pageMap[$row->ar_namespace][$row->ar_title] =
                                $pageMap[$title->getNamespace()][$title->getDBkey()];
                        }
                    }
                }
                if ( !isset( $pageMap[$row->ar_namespace][$row->ar_title] ) ) {
                    ApiBase::dieDebug(
                        __METHOD__,
                        "Found row in archive (ar_id={$row->ar_id}) that didn't get processed by ApiPageSet"
                    );
                }

                $fit = $this->addPageSubItem(
                    $pageMap[$row->ar_namespace][$row->ar_title],
                    $this->extractRevisionInfo( Revision::newFromArchiveRow( $row ), $row ),
                    'rev'
                );
                if ( !$fit ) {
                    $this->setContinueEnumParameter( 'continue',
                        $revCount
                            ? "$row->ar_rev_id|$row->ar_id"
                            : "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
                    );
                    break;
                }
            }
        }

        if ( $resultPageSet !== null ) {
            $resultPageSet->populateFromRevisionIDs( $generated );
        }
    }

    public function getAllowedParams() {
        return parent::getAllowedParams() + [
            'start' => [
                ApiBase::PARAM_TYPE => 'timestamp',
            ],
            'end' => [
                ApiBase::PARAM_TYPE => 'timestamp',
            ],
            'dir' => [
                ApiBase::PARAM_TYPE => [
                    'newer',
                    'older'
                ],
                ApiBase::PARAM_DFLT => 'older',
                ApiBase::PARAM_HELP_MSG => 'api-help-param-direction',
            ],
            'tag' => null,
            'user' => [
                ApiBase::PARAM_TYPE => 'user'
            ],
            'excludeuser' => [
                ApiBase::PARAM_TYPE => 'user'
            ],
            'continue' => [
                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
            ],
        ];
    }

    protected function getExamplesMessages() {
        return [
            'action=query&prop=deletedrevisions&titles=Main%20Page|Talk:Main%20Page&' .
                'drvprop=user|comment|content'
                => 'apihelp-query+deletedrevisions-example-titles',
            'action=query&prop=deletedrevisions&revids=123456'
                => 'apihelp-query+deletedrevisions-example-revids',
        ];
    }

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