ApiQueryUserContributions.php

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<?php
class ApiQueryContributions extends ApiQueryBase {

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

    private $params, $prefixMode, $userprefix, $multiUserMode, $idMode, $usernames, $userids,
        $parentLens;
    private $fld_ids = false, $fld_title = false, $fld_timestamp = false,
        $fld_comment = false, $fld_parsedcomment = false, $fld_flags = false,
        $fld_patrolled = false, $fld_tags = false, $fld_size = false, $fld_sizediff = false;

    public function execute() {
        // Parse some parameters
        $this->params = $this->extractRequestParams();

        $prop = array_flip( $this->params['prop'] );
        $this->fld_ids = isset( $prop['ids'] );
        $this->fld_title = isset( $prop['title'] );
        $this->fld_comment = isset( $prop['comment'] );
        $this->fld_parsedcomment = isset( $prop['parsedcomment'] );
        $this->fld_size = isset( $prop['size'] );
        $this->fld_sizediff = isset( $prop['sizediff'] );
        $this->fld_flags = isset( $prop['flags'] );
        $this->fld_timestamp = isset( $prop['timestamp'] );
        $this->fld_patrolled = isset( $prop['patrolled'] );
        $this->fld_tags = isset( $prop['tags'] );

        // Most of this code will use the 'contributions' group DB, which can map to slaves
        // with extra user based indexes or partioning by user. The additional metadata
        // queries should use a regular slave since the lookup pattern is not all by user.
        $dbSecondary = $this->getDB(); // any random slave

        // TODO: if the query is going only against the revision table, should this be done?
        $this->selectNamedDB( 'contributions', DB_SLAVE, 'contributions' );

        $this->idMode = false;
        if ( isset( $this->params['userprefix'] ) ) {
            $this->prefixMode = true;
            $this->multiUserMode = true;
            $this->userprefix = $this->params['userprefix'];
        } else {
            $anyIPs = false;
            $this->userids = [];
            $this->usernames = [];
            if ( !is_array( $this->params['user'] ) ) {
                $this->params['user'] = [ $this->params['user'] ];
            }
            if ( !count( $this->params['user'] ) ) {
                $this->dieUsage( 'User parameter may not be empty.', 'param_user' );
            }
            foreach ( $this->params['user'] as $u ) {
                if ( is_null( $u ) || $u === '' ) {
                    $this->dieUsage( 'User parameter may not be empty', 'param_user' );
                }

                if ( User::isIP( $u ) ) {
                    $anyIPs = true;
                    $this->usernames[] = $u;
                } else {
                    $name = User::getCanonicalName( $u, 'valid' );
                    if ( $name === false ) {
                        $this->dieUsage( "User name {$u} is not valid", 'param_user' );
                    }
                    $this->usernames[] = $name;
                }
            }
            $this->prefixMode = false;
            $this->multiUserMode = ( count( $this->params['user'] ) > 1 );

            if ( !$anyIPs ) {
                $dbr = $this->getDB();
                $res = $dbr->select( 'user', 'user_id', [ 'user_name' => $this->usernames ], __METHOD__ );
                foreach ( $res as $row ) {
                    $this->userids[] = $row->user_id;
                }
                $this->idMode = count( $this->userids ) === count( $this->usernames );
            }
        }

        $this->prepareQuery();

        // Do the actual query.
        $res = $this->select( __METHOD__ );

        if ( $this->fld_sizediff ) {
            $revIds = [];
            foreach ( $res as $row ) {
                if ( $row->rev_parent_id ) {
                    $revIds[] = $row->rev_parent_id;
                }
            }
            $this->parentLens = Revision::getParentLengths( $dbSecondary, $revIds );
            $res->rewind(); // reset
        }

        // Initialise some variables
        $count = 0;
        $limit = $this->params['limit'];

        // Fetch each row
        foreach ( $res as $row ) {
            if ( ++$count > $limit ) {
                // We've reached the one extra which shows that there are
                // additional pages to be had. Stop here...
                $this->setContinueEnumParameter( 'continue', $this->continueStr( $row ) );
                break;
            }

            $vals = $this->extractRowInfo( $row );
            $fit = $this->getResult()->addValue( [ 'query', $this->getModuleName() ], null, $vals );
            if ( !$fit ) {
                $this->setContinueEnumParameter( 'continue', $this->continueStr( $row ) );
                break;
            }
        }

        $this->getResult()->addIndexedTagName(
            [ 'query', $this->getModuleName() ],
            'item'
        );
    }

    private function prepareQuery() {
        // We're after the revision table, and the corresponding page
        // row for anything we retrieve. We may also need the
        // recentchanges row and/or tag summary row.
        $user = $this->getUser();
        $tables = [ 'page', 'revision' ]; // Order may change
        $this->addWhere( 'page_id=rev_page' );

        // Handle continue parameter
        if ( !is_null( $this->params['continue'] ) ) {
            $continue = explode( '|', $this->params['continue'] );
            $db = $this->getDB();
            if ( $this->multiUserMode ) {
                $this->dieContinueUsageIf( count( $continue ) != 4 );
                $modeFlag = array_shift( $continue );
                $this->dieContinueUsageIf( !in_array( $modeFlag, [ 'id', 'name' ] ) );
                if ( $this->idMode && $modeFlag === 'name' ) {
                    // The users were created since this query started, but we
                    // can't go back and change modes now. So just keep on with
                    // name mode.
                    $this->idMode = false;
                }
                $this->dieContinueUsageIf( ( $modeFlag === 'id' ) !== $this->idMode );
                $userField = $this->idMode ? 'rev_user' : 'rev_user_text';
                $encUser = $db->addQuotes( array_shift( $continue ) );
            } else {
                $this->dieContinueUsageIf( count( $continue ) != 2 );
            }
            $encTS = $db->addQuotes( $db->timestamp( $continue[0] ) );
            $encId = (int)$continue[1];
            $this->dieContinueUsageIf( $encId != $continue[1] );
            $op = ( $this->params['dir'] == 'older' ? '<' : '>' );
            if ( $this->multiUserMode ) {
                $this->addWhere(
                    "$userField $op $encUser OR " .
                    "($userField = $encUser AND " .
                    "(rev_timestamp $op $encTS OR " .
                    "(rev_timestamp = $encTS AND " .
                    "rev_id $op= $encId)))"
                );
            } else {
                $this->addWhere(
                    "rev_timestamp $op $encTS OR " .
                    "(rev_timestamp = $encTS AND " .
                    "rev_id $op= $encId)"
                );
            }
        }

        // Don't include any revisions where we're not supposed to be able to
        // see the username.
        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( $this->getDB()->bitAnd( 'rev_deleted', $bitmask ) . " != $bitmask" );
        }

        // We only want pages by the specified users.
        if ( $this->prefixMode ) {
            $this->addWhere( 'rev_user_text' .
                $this->getDB()->buildLike( $this->userprefix, $this->getDB()->anyString() ) );
        } elseif ( $this->idMode ) {
            $this->addWhereFld( 'rev_user', $this->userids );
        } else {
            $this->addWhereFld( 'rev_user_text', $this->usernames );
        }
        // ... and in the specified timeframe.
        // Ensure the same sort order for rev_user/rev_user_text and rev_timestamp
        // so our query is indexed
        if ( $this->multiUserMode ) {
            $this->addWhereRange( $this->idMode ? 'rev_user' : 'rev_user_text',
                $this->params['dir'], null, null );
        }
        $this->addTimestampWhereRange( 'rev_timestamp',
            $this->params['dir'], $this->params['start'], $this->params['end'] );
        // Include in ORDER BY for uniqueness
        $this->addWhereRange( 'rev_id', $this->params['dir'], null, null );

        $this->addWhereFld( 'page_namespace', $this->params['namespace'] );

        $show = $this->params['show'];
        if ( $this->params['toponly'] ) { // deprecated/old param
            $show[] = 'top';
        }
        if ( !is_null( $show ) ) {
            $show = array_flip( $show );

            if ( ( isset( $show['minor'] ) && isset( $show['!minor'] ) )
                || ( isset( $show['patrolled'] ) && isset( $show['!patrolled'] ) )
                || ( isset( $show['top'] ) && isset( $show['!top'] ) )
                || ( isset( $show['new'] ) && isset( $show['!new'] ) )
            ) {
                $this->dieUsageMsg( 'show' );
            }

            $this->addWhereIf( 'rev_minor_edit = 0', isset( $show['!minor'] ) );
            $this->addWhereIf( 'rev_minor_edit != 0', isset( $show['minor'] ) );
            $this->addWhereIf( 'rc_patrolled = 0', isset( $show['!patrolled'] ) );
            $this->addWhereIf( 'rc_patrolled != 0', isset( $show['patrolled'] ) );
            $this->addWhereIf( 'rev_id != page_latest', isset( $show['!top'] ) );
            $this->addWhereIf( 'rev_id = page_latest', isset( $show['top'] ) );
            $this->addWhereIf( 'rev_parent_id != 0', isset( $show['!new'] ) );
            $this->addWhereIf( 'rev_parent_id = 0', isset( $show['new'] ) );
        }
        $this->addOption( 'LIMIT', $this->params['limit'] + 1 );

        // Mandatory fields: timestamp allows request continuation
        // ns+title checks if the user has access rights for this page
        // user_text is necessary if multiple users were specified
        $this->addFields( [
            'rev_id',
            'rev_timestamp',
            'page_namespace',
            'page_title',
            'rev_user',
            'rev_user_text',
            'rev_deleted'
        ] );

        if ( isset( $show['patrolled'] ) || isset( $show['!patrolled'] ) ||
            $this->fld_patrolled
        ) {
            if ( !$user->useRCPatrol() && !$user->useNPPatrol() ) {
                $this->dieUsage(
                    'You need the patrol right to request the patrolled flag',
                    'permissiondenied'
                );
            }

            // Use a redundant join condition on both
            // timestamp and ID so we can use the timestamp
            // index
            $index['recentchanges'] = 'rc_user_text';
            if ( isset( $show['patrolled'] ) || isset( $show['!patrolled'] ) ) {
                // Put the tables in the right order for
                // STRAIGHT_JOIN
                $tables = [ 'revision', 'recentchanges', 'page' ];
                $this->addOption( 'STRAIGHT_JOIN' );
                $this->addWhere( 'rc_user_text=rev_user_text' );
                $this->addWhere( 'rc_timestamp=rev_timestamp' );
                $this->addWhere( 'rc_this_oldid=rev_id' );
            } else {
                $tables[] = 'recentchanges';
                $this->addJoinConds( [ 'recentchanges' => [
                    'LEFT JOIN', [
                        'rc_user_text=rev_user_text',
                        'rc_timestamp=rev_timestamp',
                        'rc_this_oldid=rev_id' ] ] ] );
            }
        }

        $this->addTables( $tables );
        $this->addFieldsIf( 'rev_page', $this->fld_ids );
        $this->addFieldsIf( 'page_latest', $this->fld_flags );
        // $this->addFieldsIf( 'rev_text_id', $this->fld_ids ); // Should this field be exposed?
        $this->addFieldsIf( 'rev_comment', $this->fld_comment || $this->fld_parsedcomment );
        $this->addFieldsIf( 'rev_len', $this->fld_size || $this->fld_sizediff );
        $this->addFieldsIf( 'rev_minor_edit', $this->fld_flags );
        $this->addFieldsIf( 'rev_parent_id', $this->fld_flags || $this->fld_sizediff || $this->fld_ids );
        $this->addFieldsIf( 'rc_patrolled', $this->fld_patrolled );

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

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

        if ( isset( $index ) ) {
            $this->addOption( 'USE INDEX', $index );
        }
    }

    private function extractRowInfo( $row ) {
        $vals = [];
        $anyHidden = false;

        if ( $row->rev_deleted & Revision::DELETED_TEXT ) {
            $vals['texthidden'] = true;
            $anyHidden = true;
        }

        // Any rows where we can't view the user were filtered out in the query.
        $vals['userid'] = (int)$row->rev_user;
        $vals['user'] = $row->rev_user_text;
        if ( $row->rev_deleted & Revision::DELETED_USER ) {
            $vals['userhidden'] = true;
            $anyHidden = true;
        }
        if ( $this->fld_ids ) {
            $vals['pageid'] = intval( $row->rev_page );
            $vals['revid'] = intval( $row->rev_id );
            // $vals['textid'] = intval( $row->rev_text_id ); // todo: Should this field be exposed?

            if ( !is_null( $row->rev_parent_id ) ) {
                $vals['parentid'] = intval( $row->rev_parent_id );
            }
        }

        $title = Title::makeTitle( $row->page_namespace, $row->page_title );

        if ( $this->fld_title ) {
            ApiQueryBase::addTitleInfo( $vals, $title );
        }

        if ( $this->fld_timestamp ) {
            $vals['timestamp'] = wfTimestamp( TS_ISO_8601, $row->rev_timestamp );
        }

        if ( $this->fld_flags ) {
            $vals['new'] = $row->rev_parent_id == 0 && !is_null( $row->rev_parent_id );
            $vals['minor'] = (bool)$row->rev_minor_edit;
            $vals['top'] = $row->page_latest == $row->rev_id;
        }

        if ( ( $this->fld_comment || $this->fld_parsedcomment ) && isset( $row->rev_comment ) ) {
            if ( $row->rev_deleted & Revision::DELETED_COMMENT ) {
                $vals['commenthidden'] = true;
                $anyHidden = true;
            }

            $userCanView = Revision::userCanBitfield(
                $row->rev_deleted,
                Revision::DELETED_COMMENT, $this->getUser()
            );

            if ( $userCanView ) {
                if ( $this->fld_comment ) {
                    $vals['comment'] = $row->rev_comment;
                }

                if ( $this->fld_parsedcomment ) {
                    $vals['parsedcomment'] = Linker::formatComment( $row->rev_comment, $title );
                }
            }
        }

        if ( $this->fld_patrolled ) {
            $vals['patrolled'] = (bool)$row->rc_patrolled;
        }

        if ( $this->fld_size && !is_null( $row->rev_len ) ) {
            $vals['size'] = intval( $row->rev_len );
        }

        if ( $this->fld_sizediff
            && !is_null( $row->rev_len )
            && !is_null( $row->rev_parent_id )
        ) {
            $parentLen = isset( $this->parentLens[$row->rev_parent_id] )
                ? $this->parentLens[$row->rev_parent_id]
                : 0;
            $vals['sizediff'] = intval( $row->rev_len - $parentLen );
        }

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

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

        return $vals;
    }

    private function continueStr( $row ) {
        if ( $this->multiUserMode ) {
            if ( $this->idMode ) {
                return "id|$row->rev_user|$row->rev_timestamp|$row->rev_id";
            } else {
                return "name|$row->rev_user_text|$row->rev_timestamp|$row->rev_id";
            }
        } else {
            return "$row->rev_timestamp|$row->rev_id";
        }
    }

    public function getCacheMode( $params ) {
        // This module provides access to deleted revisions and patrol flags if
        // the requester is logged in
        return 'anon-public-user-private';
    }

    public function getAllowedParams() {
        return [
            '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
            ],
            'start' => [
                ApiBase::PARAM_TYPE => 'timestamp'
            ],
            'end' => [
                ApiBase::PARAM_TYPE => 'timestamp'
            ],
            'continue' => [
                ApiBase::PARAM_HELP_MSG => 'api-help-param-continue',
            ],
            'user' => [
                ApiBase::PARAM_TYPE => 'user',
                ApiBase::PARAM_ISMULTI => true
            ],
            'userprefix' => null,
            'dir' => [
                ApiBase::PARAM_DFLT => 'older',
                ApiBase::PARAM_TYPE => [
                    'newer',
                    'older'
                ],
                ApiBase::PARAM_HELP_MSG => 'api-help-param-direction',
            ],
            'namespace' => [
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_TYPE => 'namespace'
            ],
            'prop' => [
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_DFLT => 'ids|title|timestamp|comment|size|flags',
                ApiBase::PARAM_TYPE => [
                    'ids',
                    'title',
                    'timestamp',
                    'comment',
                    'parsedcomment',
                    'size',
                    'sizediff',
                    'flags',
                    'patrolled',
                    'tags'
                ],
                ApiBase::PARAM_HELP_MSG_PER_VALUE => [],
            ],
            'show' => [
                ApiBase::PARAM_ISMULTI => true,
                ApiBase::PARAM_TYPE => [
                    'minor',
                    '!minor',
                    'patrolled',
                    '!patrolled',
                    'top',
                    '!top',
                    'new',
                    '!new',
                ],
                ApiBase::PARAM_HELP_MSG => [
                    'apihelp-query+usercontribs-param-show',
                    $this->getConfig()->get( 'RCMaxAge' )
                ],
            ],
            'tag' => null,
            'toponly' => [
                ApiBase::PARAM_DFLT => false,
                ApiBase::PARAM_DEPRECATED => true,
            ],
        ];
    }

    protected function getExamplesMessages() {
        return [
            'action=query&list=usercontribs&ucuser=Example'
                => 'apihelp-query+usercontribs-example-user',
            'action=query&list=usercontribs&ucuserprefix=192.0.2.'
                => 'apihelp-query+usercontribs-example-ipprefix',
        ];
    }

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