ApiQueryDeletedrevs.php

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<?php
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'
            );
        }

        $this->setWarning(
            'list=deletedrevs has been deprecated. Please use prop=deletedrevisions or ' .
            'list=alldeletedrevisions instead.'
        );
        $this->logFeatureUsage( 'action=query&list=deletedrevs' );

        $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 a mode that breaks the same-origin policy, no tokens can
        // be obtained
        if ( $this->lacksSameOriginSecurity() ) {
            $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 ( [ '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 ( [ '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( [ '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(
                [ '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 ( $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(
                [ 'text' => [ 'LEFT JOIN', [ 'ar_text_id=old_id' ] ] ]
            );
            $this->addFields( [ '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()->addParsedLimit( $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',
            [ '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', [
                    '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 = []; // 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 = [];
            $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'] = true;
                    $anyHidden = true;
                }
                if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_USER, $user ) ) {
                    if ( $fld_user ) {
                        $rev['user'] = $row->ar_user_text;
                    }
                    if ( $fld_userid ) {
                        $rev['userid'] = (int)$row->ar_user;
                    }
                }
            }

            if ( $fld_comment || $fld_parsedcomment ) {
                if ( $row->ar_deleted & Revision::DELETED_COMMENT ) {
                    $rev['commenthidden'] = true;
                    $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 ) {
                $rev['minor'] = $row->ar_minor_edit == 1;
            }
            if ( $fld_len ) {
                $rev['len'] = $row->ar_len;
            }
            if ( $fld_sha1 ) {
                if ( $row->ar_deleted & Revision::DELETED_TEXT ) {
                    $rev['sha1hidden'] = true;
                    $anyHidden = true;
                }
                if ( Revision::userCanBitfield( $row->ar_deleted, Revision::DELETED_TEXT, $user ) ) {
                    if ( $row->ar_sha1 != '' ) {
                        $rev['sha1'] = Wikimedia\base_convert( $row->ar_sha1, 36, 16, 40 );
                    } else {
                        $rev['sha1'] = '';
                    }
                }
            }
            if ( $fld_content ) {
                if ( $row->ar_deleted & Revision::DELETED_TEXT ) {
                    $rev['texthidden'] = true;
                    $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::setContentValue( $rev, 'text', Revision::getRevisionText( $row, 'ar_' ) );
                    } else {
                        ApiResult::setContentValue( $rev, 'text', Revision::getRevisionText( $row ) );
                    }
                }
            }

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

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

            if ( !isset( $pageMap[$row->ar_namespace][$row->ar_title] ) ) {
                $pageID = $newPageID++;
                $pageMap[$row->ar_namespace][$row->ar_title] = $pageID;
                $a['revisions'] = [ $rev ];
                ApiResult::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( [ 'query', $this->getModuleName() ], $pageID, $a );
            } else {
                $pageID = $pageMap[$row->ar_namespace][$row->ar_title];
                $fit = $result->addValue(
                    [ '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->addIndexedTagName( [ 'query', $this->getModuleName() ], 'page' );
    }

    public function isDeprecated() {
        return true;
    }

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

    protected function getExamplesMessages() {
        return [
            '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';
    }
}