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

<?php
/**
 *
 *
 * Created on Jul 2, 2007
 *
 * 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 ApiQueryDeletedrevs extends ApiQueryBase {

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

        public function execute() {
                $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 );
                $prop = array_flip( $params['prop'] );
                $fld_parentid = isset( $prop['parentid'] );
                $fld_revid = isset( $prop['revid'] );
                $fld_user = isset( $prop['user'] );
                $fld_userid = isset( $prop['userid'] );
                $fld_comment = isset( $prop['comment'] );
                $fld_parsedcomment = isset( $prop['parsedcomment'] );
                $fld_minor = isset( $prop['minor'] );
                $fld_len = isset( $prop['len'] );
                $fld_sha1 = isset( $prop['sha1'] );
                $fld_content = isset( $prop['content'] );
                $fld_token = isset( $prop['token'] );
                $fld_tags = isset( $prop['tags'] );

                if ( isset( $prop['token'] ) ) {
                        $p = $this->getModulePrefix();
                        $this->setWarning(
                                "{$p}prop=token has been deprecated. Please use action=query&meta=tokens instead."
                        );
                }

                // If we're in JSON callback mode, no tokens can be obtained
                if ( !is_null( $this->getMain()->getRequest()->getVal( 'callback' ) ) ) {
                        $fld_token = false;
                }

                // If user can't undelete, no tokens
                if ( !$user->isAllowed( 'undelete' ) ) {
                        $fld_token = false;
                }

                $result = $this->getResult();
                $pageSet = $this->getPageSet();
                $titles = $pageSet->getTitles();

                // This module operates in three modes:
                // 'revs': List deleted revs for certain titles (1)
                // 'user': List deleted revs by a certain user (2)
                // 'all': List all deleted revs in NS (3)
                $mode = 'all';
                if ( count( $titles ) > 0 ) {
                        $mode = 'revs';
                } elseif ( !is_null( $params['user'] ) ) {
                        $mode = 'user';
                }

                if ( $mode == 'revs' || $mode == 'user' ) {
                        // Ignore namespace and unique due to inability to know whether they were purposely set
                        foreach ( array( 'from', 'to', 'prefix', /*'namespace', 'unique'*/ ) as $p ) {
                                if ( !is_null( $params[$p] ) ) {
                                        $this->dieUsage( "The '{$p}' parameter cannot be used in modes 1 or 2", 'badparams' );
                                }
                        }
                } else {
                        foreach ( array( 'start', 'end' ) as $p ) {
                                if ( !is_null( $params[$p] ) ) {
                                        $this->dieUsage( "The {$p} parameter cannot be used in mode 3", 'badparams' );
                                }
                        }
                }

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

                $this->addTables( 'archive' );
                $this->addFields( array( 'ar_title', 'ar_namespace', 'ar_timestamp', 'ar_deleted', 'ar_id' ) );

                $this->addFieldsIf( 'ar_parent_id', $fld_parentid );
                $this->addFieldsIf( 'ar_rev_id', $fld_revid );
                $this->addFieldsIf( 'ar_user_text', $fld_user );
                $this->addFieldsIf( 'ar_user', $fld_userid );
                $this->addFieldsIf( 'ar_comment', $fld_comment || $fld_parsedcomment );
                $this->addFieldsIf( 'ar_minor_edit', $fld_minor );
                $this->addFieldsIf( 'ar_len', $fld_len );
                $this->addFieldsIf( 'ar_sha1', $fld_sha1 );

                if ( $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 ( $fld_content ) {
                        // 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, plus ar_text_id
                        // to be able to tell the difference.
                        $this->addTables( 'text' );
                        $this->addJoinConds(
                                array( 'text' => array( 'LEFT JOIN', array( 'ar_text_id=old_id' ) ) )
                        );
                        $this->addFields( array( 'ar_text', 'ar_flags', 'ar_text_id', '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'
                                );
                        }
                }
                // Check limits
                $userMax = $fld_content ? ApiBase::LIMIT_SML1 : ApiBase::LIMIT_BIG1;
                $botMax = $fld_content ? ApiBase::LIMIT_SML2 : ApiBase::LIMIT_BIG2;

                $limit = $params['limit'];

                if ( $limit == 'max' ) {
                        $limit = $this->getMain()->canApiHighLimits() ? $botMax : $userMax;
                        $this->getResult()->setParsedLimit( $this->getModuleName(), $limit );
                }

                $this->validateLimit( 'limit', $limit, 1, $userMax, $botMax );

                if ( $fld_token ) {
                        // Undelete tokens are identical for all pages, so we cache one here
                        $token = $user->getEditToken( '', $this->getMain()->getRequest() );
                }

                $dir = $params['dir'];

                // We need a custom WHERE clause that matches all titles.
                if ( $mode == 'revs' ) {
                        $lb = new LinkBatch( $titles );
                        $where = $lb->constructSet( 'ar', $db );
                        $this->addWhere( $where );
                } elseif ( $mode == 'all' ) {
                        $this->addWhereFld( 'ar_namespace', $params['namespace'] );

                        $from = $params['from'] === null
                                ? null
                                : $this->titlePartToKey( $params['from'], $params['namespace'] );
                        $to = $params['to'] === null
                                ? null
                                : $this->titlePartToKey( $params['to'], $params['namespace'] );
                        $this->addWhereRange( 'ar_title', $dir, $from, $to );

                        if ( isset( $params['prefix'] ) ) {
                                $this->addWhere( 'ar_title' . $db->buildLike(
                                        $this->titlePartToKey( $params['prefix'], $params['namespace'] ),
                                        $db->anyString() ) );
                        }
                }

                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 ( $mode == 'all' || $mode == 'revs' ) {
                                $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', $limit + 1 );
                $this->addOption(
                        'USE INDEX',
                        array( 'archive' => ( $mode == 'user' ? 'usertext_timestamp' : 'name_title_timestamp' ) )
                );
                if ( $mode == 'all' ) {
                        if ( $params['unique'] ) {
                                // @todo Does this work on non-MySQL?
                                $this->addOption( 'GROUP BY', 'ar_title' );
                        } else {
                                $sort = ( $dir == 'newer' ? '' : ' DESC' );
                                $this->addOption( 'ORDER BY', array(
                                        'ar_title' . $sort,
                                        'ar_timestamp' . $sort,
                                        'ar_id' . $sort,
                                ) );
                        }
                } else {
                        if ( $mode == 'revs' ) {
                                // Sort by ns and title in the same order as timestamp for efficiency
                                $this->addWhereRange( 'ar_namespace', $dir, null, null );
                                $this->addWhereRange( 'ar_title', $dir, null, null );
                        }
                        $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__ );
                $pageMap = array(); // Maps ns&title to (fake) pageid
                $count = 0;
                $newPageID = 0;
                foreach ( $res as $row ) {
                        if ( ++$count > $limit ) {
                                // We've had enough
                                if ( $mode == 'all' || $mode == 'revs' ) {
                                        $this->setContinueEnumParameter( 'continue',
                                                "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
                                        );
                                } else {
                                        $this->setContinueEnumParameter( 'continue', "$row->ar_timestamp|$row->ar_id" );
                                }
                                break;
                        }

                        $rev = array();
                        $anyHidden = false;

                        $rev['timestamp'] = wfTimestamp( TS_ISO_8601, $row->ar_timestamp );
                        if ( $fld_revid ) {
                                $rev['revid'] = intval( $row->ar_rev_id );
                        }
                        if ( $fld_parentid && !is_null( $row->ar_parent_id ) ) {
                                $rev['parentid'] = intval( $row->ar_parent_id );
                        }
                        if ( $fld_user || $fld_userid ) {
                                if ( $row->ar_deleted & Revision::DELETED_USER ) {
                                        $rev['userhidden'] = '';
                                        $anyHidden = true;
                                }
                                if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_USER, $user ) ) {
                                        if ( $fld_user ) {
                                                $rev['user'] = $row->ar_user_text;
                                        }
                                        if ( $fld_userid ) {
                                                $rev['userid'] = $row->ar_user;
                                        }
                                }
                        }

                        if ( $fld_comment || $fld_parsedcomment ) {
                                if ( $row->ar_deleted & Revision::DELETED_COMMENT ) {
                                        $rev['commenthidden'] = '';
                                        $anyHidden = true;
                                }
                                if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_COMMENT, $user ) ) {
                                        if ( $fld_comment ) {
                                                $rev['comment'] = $row->ar_comment;
                                        }
                                        if ( $fld_parsedcomment ) {
                                                $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
                                                $rev['parsedcomment'] = Linker::formatComment( $row->ar_comment, $title );
                                        }
                                }
                        }

                        if ( $fld_minor && $row->ar_minor_edit == 1 ) {
                                $rev['minor'] = '';
                        }
                        if ( $fld_len ) {
                                $rev['len'] = $row->ar_len;
                        }
                        if ( $fld_sha1 ) {
                                if ( $row->ar_deleted & Revision::DELETED_TEXT ) {
                                        $rev['sha1hidden'] = '';
                                        $anyHidden = true;
                                }
                                if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_TEXT, $user ) ) {
                                        if ( $row->ar_sha1 != '' ) {
                                                $rev['sha1'] = wfBaseConvert( $row->ar_sha1, 36, 16, 40 );
                                        } else {
                                                $rev['sha1'] = '';
                                        }
                                }
                        }
                        if ( $fld_content ) {
                                if ( $row->ar_deleted & Revision::DELETED_TEXT ) {
                                        $rev['texthidden'] = '';
                                        $anyHidden = true;
                                }
                                if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_TEXT, $user ) ) {
                                        if ( isset( $row->ar_text ) && !$row->ar_text_id ) {
                                                // Pre-1.5 ar_text row (if condition from Revision::newFromArchiveRow)
                                                ApiResult::setContent( $rev, Revision::getRevisionText( $row, 'ar_' ) );
                                        } else {
                                                ApiResult::setContent( $rev, Revision::getRevisionText( $row ) );
                                        }
                                }
                        }

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

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

                        if ( !isset( $pageMap[$row->ar_namespace][$row->ar_title] ) ) {
                                $pageID = $newPageID++;
                                $pageMap[$row->ar_namespace][$row->ar_title] = $pageID;
                                $a['revisions'] = array( $rev );
                                $result->setIndexedTagName( $a['revisions'], 'rev' );
                                $title = Title::makeTitle( $row->ar_namespace, $row->ar_title );
                                ApiQueryBase::addTitleInfo( $a, $title );
                                if ( $fld_token ) {
                                        $a['token'] = $token;
                                }
                                $fit = $result->addValue( array( 'query', $this->getModuleName() ), $pageID, $a );
                        } else {
                                $pageID = $pageMap[$row->ar_namespace][$row->ar_title];
                                $fit = $result->addValue(
                                        array( 'query', $this->getModuleName(), $pageID, 'revisions' ),
                                        null, $rev );
                        }
                        if ( !$fit ) {
                                if ( $mode == 'all' || $mode == 'revs' ) {
                                        $this->setContinueEnumParameter( 'continue',
                                                "$row->ar_namespace|$row->ar_title|$row->ar_timestamp|$row->ar_id"
                                        );
                                } else {
                                        $this->setContinueEnumParameter( 'continue', "$row->ar_timestamp|$row->ar_id" );
                                }
                                break;
                        }
                }
                $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), 'page' );
        }

        public function getAllowedParams() {
                return array(
                        'start' => array(
                                ApiBase::PARAM_TYPE => 'timestamp',
                                ApiBase::PARAM_HELP_MSG_INFO => array( array( 'modes', 1, 2 ) ),
                        ),
                        'end' => array(
                                ApiBase::PARAM_TYPE => 'timestamp',
                                ApiBase::PARAM_HELP_MSG_INFO => array( array( 'modes', 1, 2 ) ),
                        ),
                        'dir' => array(
                                ApiBase::PARAM_TYPE => array(
                                        'newer',
                                        'older'
                                ),
                                ApiBase::PARAM_DFLT => 'older',
                                ApiBase::PARAM_HELP_MSG => 'api-help-param-direction',
                                ApiBase::PARAM_HELP_MSG_INFO => array( array( 'modes', 1, 3 ) ),
                        ),
                        'from' => array(
                                ApiBase::PARAM_HELP_MSG_INFO => array( array( 'modes', 3 ) ),
                        ),
                        'to' => array(
                                ApiBase::PARAM_HELP_MSG_INFO => array( array( 'modes', 3 ) ),
                        ),
                        'prefix' => array(
                                ApiBase::PARAM_HELP_MSG_INFO => array( array( 'modes', 3 ) ),
                        ),
                        'unique' => array(
                                ApiBase::PARAM_DFLT => false,
                                ApiBase::PARAM_HELP_MSG_INFO => array( array( 'modes', 3 ) ),
                        ),
                        'namespace' => array(
                                ApiBase::PARAM_TYPE => 'namespace',
                                ApiBase::PARAM_DFLT => NS_MAIN,
                                ApiBase::PARAM_HELP_MSG_INFO => array( array( 'modes', 3 ) ),
                        ),
                        'tag' => null,
                        'user' => array(
                                ApiBase::PARAM_TYPE => 'user'
                        ),
                        'excludeuser' => array(
                                ApiBase::PARAM_TYPE => 'user'
                        ),
                        'prop' => array(
                                ApiBase::PARAM_DFLT => 'user|comment',
                                ApiBase::PARAM_TYPE => array(
                                        'revid',
                                        'parentid',
                                        'user',
                                        'userid',
                                        'comment',
                                        'parsedcomment',
                                        'minor',
                                        'len',
                                        'sha1',
                                        'content',
                                        'token',
                                        'tags'
                                ),
                                ApiBase::PARAM_ISMULTI => true
                        ),
                        '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
                        ),
                        'continue' => array(
                                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
                        ),
                );
        }

        public function getExamplesMessages() {
                return array(
                        'action=query&list=deletedrevs&titles=Main%20Page|Talk:Main%20Page&' .
                                'drprop=user|comment|content'
                                => 'apihelp-query+deletedrevs-example-mode1',
                        'action=query&list=deletedrevs&druser=Bob&drlimit=50'
                                => 'apihelp-query+deletedrevs-example-mode2',
                        'action=query&list=deletedrevs&drdir=newer&drlimit=50'
                                => 'apihelp-query+deletedrevs-example-mode3-main',
                        'action=query&list=deletedrevs&drdir=newer&drlimit=50&drnamespace=1&drunique='
                                => 'apihelp-query+deletedrevs-example-mode3-talk',
                );
        }

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