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[mediawiki.git] / includes / revisiondelete / RevisionDeleteAbstracts.php

<?php
/**
 * Interface definition for deletable items.
 *
 * 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
 * @ingroup RevisionDelete
 */

/**
 * Abstract base class for a list of deletable items. The list class
 * needs to be able to make a query from a set of identifiers to pull
 * relevant rows, to return RevDel_Item subclasses wrapping them, and
 * to wrap bulk update operations.
 */
abstract class RevDel_List extends RevisionListBase {
        function __construct( IContextSource $context, Title $title, array $ids ) {
                parent::__construct( $context, $title );
                $this->ids = $ids;
        }

        /**
         * Get the DB field name associated with the ID list.
         * This used to populate the log_search table for finding log entries.
         * Override this function.
         * @return string|null
         */
        public static function getRelationType() {
                return null;
        }

        /**
         * Get the user right required for this list type
         * Override this function.
         * @since 1.22
         * @return string|null
         */
        public static function getRestriction() {
                return null;
        }

        /**
         * Get the revision deletion constant for this list type
         * Override this function.
         * @since 1.22
         * @return int|null
         */
        public static function getRevdelConstant() {
                return null;
        }

        /**
         * Suggest a target for the revision deletion
         * Optionally override this function.
         * @since 1.22
         * @param Title|null $target User-supplied target
         * @param array $ids
         * @return Title|null
         */
        public static function suggestTarget( $target, array $ids ) {
                return $target;
        }

        /**
         * Set the visibility for the revisions in this list. Logging and
         * transactions are done here.
         *
         * @param array $params Associative array of parameters. Members are:
         *     value:         The integer value to set the visibility to
         *     comment:       The log comment.
         *     perItemStatus: Set if you want per-item status reports
         * @return Status
         * @since 1.23 Added 'perItemStatus' param
         */
        public function setVisibility( $params ) {
                $bitPars = $params['value'];
                $comment = $params['comment'];
                $perItemStatus = isset( $params['perItemStatus'] ) ? $params['perItemStatus'] : false;

                $this->res = false;
                $dbw = wfGetDB( DB_MASTER );
                $this->doQuery( $dbw );
                $dbw->begin( __METHOD__ );
                $status = Status::newGood();
                $missing = array_flip( $this->ids );
                $this->clearFileOps();
                $idsForLog = array();
                $authorIds = $authorIPs = array();

                if ( $perItemStatus ) {
                        $status->itemStatuses = array();
                }

                for ( $this->reset(); $this->current(); $this->next() ) {
                        $item = $this->current();
                        unset( $missing[$item->getId()] );

                        if ( $perItemStatus ) {
                                $itemStatus = Status::newGood();
                                $status->itemStatuses[$item->getId()] = $itemStatus;
                        } else {
                                $itemStatus = $status;
                        }

                        $oldBits = $item->getBits();
                        // Build the actual new rev_deleted bitfield
                        $newBits = RevisionDeleter::extractBitfield( $bitPars, $oldBits );

                        if ( $oldBits == $newBits ) {
                                $itemStatus->warning( 'revdelete-no-change', $item->formatDate(), $item->formatTime() );
                                $status->failCount++;
                                continue;
                        } elseif ( $oldBits == 0 && $newBits != 0 ) {
                                $opType = 'hide';
                        } elseif ( $oldBits != 0 && $newBits == 0 ) {
                                $opType = 'show';
                        } else {
                                $opType = 'modify';
                        }

                        if ( $item->isHideCurrentOp( $newBits ) ) {
                                // Cannot hide current version text
                                $itemStatus->error( 'revdelete-hide-current', $item->formatDate(), $item->formatTime() );
                                $status->failCount++;
                                continue;
                        }
                        if ( !$item->canView() ) {
                                // Cannot access this revision
                                $msg = ( $opType == 'show' ) ?
                                        'revdelete-show-no-access' : 'revdelete-modify-no-access';
                                $itemStatus->error( $msg, $item->formatDate(), $item->formatTime() );
                                $status->failCount++;
                                continue;
                        }
                        // Cannot just "hide from Sysops" without hiding any fields
                        if ( $newBits == Revision::DELETED_RESTRICTED ) {
                                $itemStatus->warning( 'revdelete-only-restricted', $item->formatDate(), $item->formatTime() );
                                $status->failCount++;
                                continue;
                        }

                        // Update the revision
                        $ok = $item->setBits( $newBits );

                        if ( $ok ) {
                                $idsForLog[] = $item->getId();
                                $status->successCount++;
                                if ( $item->getAuthorId() > 0 ) {
                                        $authorIds[] = $item->getAuthorId();
                                } elseif ( IP::isIPAddress( $item->getAuthorName() ) ) {
                                        $authorIPs[] = $item->getAuthorName();
                                }
                        } else {
                                $itemStatus->error( 'revdelete-concurrent-change', $item->formatDate(), $item->formatTime() );
                                $status->failCount++;
                        }
                }

                // Handle missing revisions
                foreach ( $missing as $id => $unused ) {
                        if ( $perItemStatus ) {
                                $status->itemStatuses[$id] = Status::newFatal( 'revdelete-modify-missing', $id );
                        } else {
                                $status->error( 'revdelete-modify-missing', $id );
                        }
                        $status->failCount++;
                }

                if ( $status->successCount == 0 ) {
                        $dbw->rollback( __METHOD__ );
                        return $status;
                }

                // Save success count
                $successCount = $status->successCount;

                // Move files, if there are any
                $status->merge( $this->doPreCommitUpdates() );
                if ( !$status->isOK() ) {
                        // Fatal error, such as no configured archive directory
                        $dbw->rollback( __METHOD__ );
                        return $status;
                }

                // Log it
                $this->updateLog( array(
                        'title' => $this->title,
                        'count' => $successCount,
                        'newBits' => $newBits,
                        'oldBits' => $oldBits,
                        'comment' => $comment,
                        'ids' => $idsForLog,
                        'authorIds' => $authorIds,
                        'authorIPs' => $authorIPs
                ) );
                $dbw->commit( __METHOD__ );

                // Clear caches
                $status->merge( $this->doPostCommitUpdates() );
                return $status;
        }

        /**
         * Reload the list data from the master DB. This can be done after setVisibility()
         * to allow $item->getHTML() to show the new data.
         */
        function reloadFromMaster() {
                $dbw = wfGetDB( DB_MASTER );
                $this->res = $this->doQuery( $dbw );
        }

        /**
         * Record a log entry on the action
         * @param array $params Associative array of parameters:
         *     newBits:         The new value of the *_deleted bitfield
         *     oldBits:         The old value of the *_deleted bitfield.
         *     title:           The target title
         *     ids:             The ID list
         *     comment:         The log comment
         *     authorsIds:      The array of the user IDs of the offenders
         *     authorsIPs:      The array of the IP/anon user offenders
         * @throws MWException
         */
        protected function updateLog( $params ) {
                // Get the URL param's corresponding DB field
                $field = RevisionDeleter::getRelationType( $this->getType() );
                if ( !$field ) {
                        throw new MWException( "Bad log URL param type!" );
                }
                // Put things hidden from sysops in the oversight log
                if ( ( $params['newBits'] | $params['oldBits'] ) & $this->getSuppressBit() ) {
                        $logType = 'suppress';
                } else {
                        $logType = 'delete';
                }
                // Add params for effected page and ids
                $logParams = $this->getLogParams( $params );
                // Actually add the deletion log entry
                $log = new LogPage( $logType );
                $logid = $log->addEntry( $this->getLogAction(), $params['title'],
                        $params['comment'], $logParams, $this->getUser() );
                // Allow for easy searching of deletion log items for revision/log items
                $log->addRelations( $field, $params['ids'], $logid );
                $log->addRelations( 'target_author_id', $params['authorIds'], $logid );
                $log->addRelations( 'target_author_ip', $params['authorIPs'], $logid );
        }

        /**
         * Get the log action for this list type
         * @return string
         */
        public function getLogAction() {
                return 'revision';
        }

        /**
         * Get log parameter array.
         * @param array $params Associative array of log parameters, same as updateLog()
         * @return array
         */
        public function getLogParams( $params ) {
                return array(
                        $this->getType(),
                        implode( ',', $params['ids'] ),
                        "ofield={$params['oldBits']}",
                        "nfield={$params['newBits']}"
                );
        }

        /**
         * Clear any data structures needed for doPreCommitUpdates() and doPostCommitUpdates()
         * STUB
         */
        public function clearFileOps() {
        }

        /**
         * A hook for setVisibility(): do batch updates pre-commit.
         * STUB
         * @return Status
         */
        public function doPreCommitUpdates() {
                return Status::newGood();
        }

        /**
         * A hook for setVisibility(): do any necessary updates post-commit.
         * STUB
         * @return Status
         */
        public function doPostCommitUpdates() {
                return Status::newGood();
        }

        /**
         * Get the integer value of the flag used for suppression
         */
        abstract public function getSuppressBit();
}

/**
 * Abstract base class for deletable items
 */
abstract class RevDel_Item extends RevisionItemBase {
        /**
         * Returns true if the item is "current", and the operation to set the given
         * bits can't be executed for that reason
         * STUB
         * @return bool
         */
        public function isHideCurrentOp( $newBits ) {
                return false;
        }

        /**
         * Get the current deletion bitfield value
         */
        abstract public function getBits();

        /**
         * Set the visibility of the item. This should do any necessary DB queries.
         *
         * The DB update query should have a condition which forces it to only update
         * if the value in the DB matches the value fetched earlier with the SELECT.
         * If the update fails because it did not match, the function should return
         * false. This prevents concurrency problems.
         *
         * @return boolean success
         */
        abstract public function setBits( $newBits );

        /**
         * Get the return information about the revision for the API
         * @since 1.23
         * @param ApiResult $result API result object
         * @return array Data for the API result
         */
        abstract public function getApiData( ApiResult $result );
}