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'
            );
        }

        $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'
            ),
            'end' => array(
                ApiBase::PARAM_TYPE => 'timestamp',
            ),
            'dir' => array(
                ApiBase::PARAM_TYPE => array(
                    'newer',
                    'older'
                ),
                ApiBase::PARAM_DFLT => 'older'
            ),
            'from' => null,
            'to' => null,
            'prefix' => null,
            'continue' => null,
            'unique' => false,
            'tag' => null,
            'user' => array(
                ApiBase::PARAM_TYPE => 'user'
            ),
            'excludeuser' => array(
                ApiBase::PARAM_TYPE => 'user'
            ),
            'namespace' => array(
                ApiBase::PARAM_TYPE => 'namespace',
                ApiBase::PARAM_DFLT => NS_MAIN,
            ),
            '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
            ),
            '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
            ),
        );
    }

    public function getParamDescription() {
        return array(
            'start' => 'The timestamp to start enumerating from (1, 2)',
            'end' => 'The timestamp to stop enumerating at (1, 2)',
            'dir' => $this->getDirectionDescription( $this->getModulePrefix(), ' (1, 3)' ),
            'from' => 'Start listing at this title (3)',
            'to' => 'Stop listing at this title (3)',
            'prefix' => 'Search for all page titles that begin with this value (3)',
            'limit' => 'The maximum amount of revisions to list',
            'prop' => array(
                'Which properties to get',
                ' revid          - Adds the revision ID of the deleted revision',
                ' parentid       - Adds the revision ID of the previous revision to the page',
                ' user           - Adds the user who made the revision',
                ' userid         - Adds the user ID whom made the revision',
                ' comment        - Adds the comment of the revision',
                ' parsedcomment  - Adds the parsed comment of the revision',
                ' minor          - Tags if the revision is minor',
                ' len            - Adds the length (bytes) of the revision',
                ' sha1           - Adds the SHA-1 (base 16) of the revision',
                ' content        - Adds the content of the revision',
                ' token          - DEPRECATED! Gives the edit token',
                ' tags           - Tags for the revision',
            ),
            'namespace' => 'Only list pages in this namespace (3)',
            'user' => 'Only list revisions by this user',
            'excludeuser' => 'Don\'t list revisions by this user',
            'continue' => 'When more results are available, use this to continue',
            'unique' => 'List only one revision for each page (3)',
            'tag' => 'Only list revisions tagged with this tag',
        );
    }

    public function getDescription() {
        $p = $this->getModulePrefix();

        return array(
            'List deleted revisions.',
            'Operates in three modes:',
            ' 1) List deleted revisions for the given title(s), sorted by timestamp.',
            ' 2) List deleted contributions for the given user, sorted by timestamp (no titles specified).',
            ' 3) List all deleted revisions in the given namespace, sorted by title and timestamp',
            "    (no titles specified, {$p}user not set).",
            'Certain parameters only apply to some modes and are ignored in others.',
            'For instance, a parameter marked (1) only applies to mode 1 and is ignored in modes 2 and 3.',
        );
    }

    public function getExamples() {
        return array(
            'api.php?action=query&list=deletedrevs&titles=Main%20Page|Talk:Main%20Page&' .
                'drprop=user|comment|content'
                => 'List the last deleted revisions of Main Page and Talk:Main Page, with content (mode 1)',
            'api.php?action=query&list=deletedrevs&druser=Bob&drlimit=50'
                => 'List the last 50 deleted contributions by Bob (mode 2)',
            'api.php?action=query&list=deletedrevs&drdir=newer&drlimit=50'
                => 'List the first 50 deleted revisions in the main namespace (mode 3)',
            'api.php?action=query&list=deletedrevs&drdir=newer&drlimit=50&drnamespace=1&drunique='
                => 'List the first 50 deleted pages in the Talk namespace (mode 3):',
        );
    }

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