Merge "mw.Title: Add method to get title relative to an arbitrary namespace"

[mediawiki.git] / includes / filerepo / file / ArchivedFile.php

<?php
/**
 * Deleted file in the 'filearchive' table.
 *
 * 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 FileAbstraction
 */

/**
 * Class representing a row of the 'filearchive' table
 *
 * @ingroup FileAbstraction
 */
class ArchivedFile {
        /** @var int Filearchive row ID */
        private $id;

        /** @var string File name */
        private $name;

        /** @var string FileStore storage group */
        private $group;

        /** @var string FileStore SHA-1 key */
        private $key;

        /** @var int File size in bytes */
        private $size;

        /** @var int Size in bytes */
        private $bits;

        /** @var int Width */
        private $width;

        /** @var int Height */
        private $height;

        /** @var string Metadata string */
        private $metadata;

        /** @var string MIME type */
        private $mime;

        /** @var string Media type */
        private $media_type;

        /** @var string Upload description */
        private $description;

        /** @var int User ID of uploader */
        private $user;

        /** @var string User name of uploader */
        private $user_text;

        /** @var string Time of upload */
        private $timestamp;

        /** @var bool Whether or not all this has been loaded from the database (loadFromXxx) */
        private $dataLoaded;

        /** @var int Bitfield akin to rev_deleted */
        private $deleted;

        /** @var string SHA-1 hash of file content */
        private $sha1;

        /** @var string Number of pages of a multipage document, or false for
         * documents which aren't multipage documents
         */
        private $pageCount;

        /** @var string Original base filename */
        private $archive_name;

        /** @var MediaHandler */
        protected $handler;

        /** @var Title */
        protected $title; # image title

        /**
         * @throws MWException
         * @param Title $title
         * @param int $id
         * @param string $key
         */
        function __construct( $title, $id = 0, $key = '' ) {
                $this->id = -1;
                $this->title = false;
                $this->name = false;
                $this->group = 'deleted'; // needed for direct use of constructor
                $this->key = '';
                $this->size = 0;
                $this->bits = 0;
                $this->width = 0;
                $this->height = 0;
                $this->metadata = '';
                $this->mime = "unknown/unknown";
                $this->media_type = '';
                $this->description = '';
                $this->user = 0;
                $this->user_text = '';
                $this->timestamp = null;
                $this->deleted = 0;
                $this->dataLoaded = false;
                $this->exists = false;
                $this->sha1 = '';

                if ( $title instanceof Title ) {
                        $this->title = File::normalizeTitle( $title, 'exception' );
                        $this->name = $title->getDBkey();
                }

                if ( $id ) {
                        $this->id = $id;
                }

                if ( $key ) {
                        $this->key = $key;
                }

                if ( !$id && !$key && !( $title instanceof Title ) ) {
                        throw new MWException( "No specifications provided to ArchivedFile constructor." );
                }
        }

        /**
         * Loads a file object from the filearchive table
         * @throws MWException
         * @return bool|null True on success or null
         */
        public function load() {
                if ( $this->dataLoaded ) {
                        return true;
                }
                $conds = array();

                if ( $this->id > 0 ) {
                        $conds['fa_id'] = $this->id;
                }
                if ( $this->key ) {
                        $conds['fa_storage_group'] = $this->group;
                        $conds['fa_storage_key'] = $this->key;
                }
                if ( $this->title ) {
                        $conds['fa_name'] = $this->title->getDBkey();
                }

                if ( !count( $conds ) ) {
                        throw new MWException( "No specific information for retrieving archived file" );
                }

                if ( !$this->title || $this->title->getNamespace() == NS_FILE ) {
                        $this->dataLoaded = true; // set it here, to have also true on miss
                        $dbr = wfGetDB( DB_SLAVE );
                        $row = $dbr->selectRow(
                                'filearchive',
                                self::selectFields(),
                                $conds,
                                __METHOD__,
                                array( 'ORDER BY' => 'fa_timestamp DESC' )
                        );
                        if ( !$row ) {
                                // this revision does not exist?
                                return null;
                        }

                        // initialize fields for filestore image object
                        $this->loadFromRow( $row );
                } else {
                        throw new MWException( 'This title does not correspond to an image page.' );
                }
                $this->exists = true;

                return true;
        }

        /**
         * Loads a file object from the filearchive table
         *
         * @param stdClass $row
         * @return ArchivedFile
         */
        public static function newFromRow( $row ) {
                $file = new ArchivedFile( Title::makeTitle( NS_FILE, $row->fa_name ) );
                $file->loadFromRow( $row );

                return $file;
        }

        /**
         * Fields in the filearchive table
         * @return array
         */
        static function selectFields() {
                return array(
                        'fa_id',
                        'fa_name',
                        'fa_archive_name',
                        'fa_storage_key',
                        'fa_storage_group',
                        'fa_size',
                        'fa_bits',
                        'fa_width',
                        'fa_height',
                        'fa_metadata',
                        'fa_media_type',
                        'fa_major_mime',
                        'fa_minor_mime',
                        'fa_description',
                        'fa_user',
                        'fa_user_text',
                        'fa_timestamp',
                        'fa_deleted',
                        'fa_deleted_timestamp', /* Used by LocalFileRestoreBatch */
                        'fa_sha1',
                );
        }

        /**
         * Load ArchivedFile object fields from a DB row.
         *
         * @param stdClass $row Object database row
         * @since 1.21
         */
        public function loadFromRow( $row ) {
                $this->id = intval( $row->fa_id );
                $this->name = $row->fa_name;
                $this->archive_name = $row->fa_archive_name;
                $this->group = $row->fa_storage_group;
                $this->key = $row->fa_storage_key;
                $this->size = $row->fa_size;
                $this->bits = $row->fa_bits;
                $this->width = $row->fa_width;
                $this->height = $row->fa_height;
                $this->metadata = $row->fa_metadata;
                $this->mime = "$row->fa_major_mime/$row->fa_minor_mime";
                $this->media_type = $row->fa_media_type;
                $this->description = $row->fa_description;
                $this->user = $row->fa_user;
                $this->user_text = $row->fa_user_text;
                $this->timestamp = $row->fa_timestamp;
                $this->deleted = $row->fa_deleted;
                if ( isset( $row->fa_sha1 ) ) {
                        $this->sha1 = $row->fa_sha1;
                } else {
                        // old row, populate from key
                        $this->sha1 = LocalRepo::getHashFromKey( $this->key );
                }
                if ( !$this->title ) {
                        $this->title = Title::makeTitleSafe( NS_FILE, $row->fa_name );
                }
        }

        /**
         * Return the associated title object
         *
         * @return Title
         */
        public function getTitle() {
                if ( !$this->title ) {
                        $this->load();
                }
                return $this->title;
        }

        /**
         * Return the file name
         *
         * @return string
         */
        public function getName() {
                if ( $this->name === false ) {
                        $this->load();
                }

                return $this->name;
        }

        /**
         * @return int
         */
        public function getID() {
                $this->load();

                return $this->id;
        }

        /**
         * @return bool
         */
        public function exists() {
                $this->load();

                return $this->exists;
        }

        /**
         * Return the FileStore key
         * @return string
         */
        public function getKey() {
                $this->load();

                return $this->key;
        }

        /**
         * Return the FileStore key (overriding base File class)
         * @return string
         */
        public function getStorageKey() {
                return $this->getKey();
        }

        /**
         * Return the FileStore storage group
         * @return string
         */
        public function getGroup() {
                return $this->group;
        }

        /**
         * Return the width of the image
         * @return int
         */
        public function getWidth() {
                $this->load();

                return $this->width;
        }

        /**
         * Return the height of the image
         * @return int
         */
        public function getHeight() {
                $this->load();

                return $this->height;
        }

        /**
         * Get handler-specific metadata
         * @return string
         */
        public function getMetadata() {
                $this->load();

                return $this->metadata;
        }

        /**
         * Return the size of the image file, in bytes
         * @return int
         */
        public function getSize() {
                $this->load();

                return $this->size;
        }

        /**
         * Return the bits of the image file, in bytes
         * @return int
         */
        public function getBits() {
                $this->load();

                return $this->bits;
        }

        /**
         * Returns the MIME type of the file.
         * @return string
         */
        public function getMimeType() {
                $this->load();

                return $this->mime;
        }

        /**
         * Get a MediaHandler instance for this file
         * @return MediaHandler
         */
        function getHandler() {
                if ( !isset( $this->handler ) ) {
                        $this->handler = MediaHandler::getHandler( $this->getMimeType() );
                }

                return $this->handler;
        }

        /**
         * Returns the number of pages of a multipage document, or false for
         * documents which aren't multipage documents
         * @return bool|int
         */
        function pageCount() {
                if ( !isset( $this->pageCount ) ) {
                        if ( $this->getHandler() && $this->handler->isMultiPage( $this ) ) {
                                $this->pageCount = $this->handler->pageCount( $this );
                        } else {
                                $this->pageCount = false;
                        }
                }

                return $this->pageCount;
        }

        /**
         * Return the type of the media in the file.
         * Use the value returned by this function with the MEDIATYPE_xxx constants.
         * @return string
         */
        public function getMediaType() {
                $this->load();

                return $this->media_type;
        }

        /**
         * Return upload timestamp.
         *
         * @return string
         */
        public function getTimestamp() {
                $this->load();

                return wfTimestamp( TS_MW, $this->timestamp );
        }

        /**
         * Get the SHA-1 base 36 hash of the file
         *
         * @return string
         * @since 1.21
         */
        function getSha1() {
                $this->load();

                return $this->sha1;
        }

        /**
         * Returns ID or name of user who uploaded the file
         *
         * @note Prior to MediaWiki 1.23, this method always
         *   returned the user id, and was inconsistent with
         *   the rest of the file classes.
         * @param string $type 'text' or 'id'
         * @return int|string
         * @throws MWException
         */
        public function getUser( $type = 'text' ) {
                $this->load();

                if ( $type == 'text' ) {
                        return $this->user_text;
                } elseif ( $type == 'id' ) {
                        return $this->user;
                }

                throw new MWException( "Unknown type '$type'." );
        }

        /**
         * Return the user name of the uploader.
         *
         * @deprecated since 1.23 Use getUser( 'text' ) instead.
         * @return string
         */
        public function getUserText() {
                wfDeprecated( __METHOD__, '1.23' );
                $this->load();
                if ( $this->isDeleted( File::DELETED_USER ) ) {
                        return 0;
                } else {
                        return $this->user_text;
                }
        }

        /**
         * Return upload description.
         *
         * @return string
         */
        public function getDescription() {
                $this->load();
                if ( $this->isDeleted( File::DELETED_COMMENT ) ) {
                        return 0;
                } else {
                        return $this->description;
                }
        }

        /**
         * Return the user ID of the uploader.
         *
         * @return int
         */
        public function getRawUser() {
                $this->load();

                return $this->user;
        }

        /**
         * Return the user name of the uploader.
         *
         * @return string
         */
        public function getRawUserText() {
                $this->load();

                return $this->user_text;
        }

        /**
         * Return upload description.
         *
         * @return string
         */
        public function getRawDescription() {
                $this->load();

                return $this->description;
        }

        /**
         * Returns the deletion bitfield
         * @return int
         */
        public function getVisibility() {
                $this->load();

                return $this->deleted;
        }

        /**
         * for file or revision rows
         *
         * @param int $field One of DELETED_* bitfield constants
         * @return bool
         */
        public function isDeleted( $field ) {
                $this->load();

                return ( $this->deleted & $field ) == $field;
        }

        /**
         * Determine if the current user is allowed to view a particular
         * field of this FileStore image file, if it's marked as deleted.
         * @param int $field
         * @param null|User $user User object to check, or null to use $wgUser
         * @return bool
         */
        public function userCan( $field, User $user = null ) {
                $this->load();

                $title = $this->getTitle();
                return Revision::userCanBitfield( $this->deleted, $field, $user, $title ? : null );
        }
}