FileRepo.php

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<?php
class FileRepo {
        const DELETE_SOURCE = 1;
        const OVERWRITE = 2;
        const OVERWRITE_SAME = 4;
        const SKIP_LOCKING = 8;

        protected $backend;
        protected $zones = array();

        var $thumbScriptUrl, $transformVia404;
        var $descBaseUrl, $scriptDirUrl, $scriptExtension, $articleUrl;
        var $fetchDescription, $initialCapital;
        var $pathDisclosureProtection = 'simple'; // 'paranoid'
        var $descriptionCacheExpiry, $url, $thumbUrl;
        var $hashLevels, $deletedHashLevels;
        protected $abbrvThreshold;

        var $fileFactory = array( 'UnregisteredLocalFile', 'newFromTitle' );
        var $oldFileFactory = false;
        var $fileFactoryKey = false, $oldFileFactoryKey = false;

        public function __construct( array $info = null ) {
                // Verify required settings presence
                if(
                        $info === null
                        || !array_key_exists( 'name', $info )
                        || !array_key_exists( 'backend', $info )
                ) {
                        throw new MWException( __CLASS__ . " requires an array of options having both 'name' and 'backend' keys.\n" );
                }

                // Required settings
                $this->name = $info['name'];
                if ( $info['backend'] instanceof FileBackend ) {
                        $this->backend = $info['backend']; // useful for testing
                } else {
                        $this->backend = FileBackendGroup::singleton()->get( $info['backend'] );
                }

                // Optional settings that can have no value
                $optionalSettings = array(
                        'descBaseUrl', 'scriptDirUrl', 'articleUrl', 'fetchDescription',
                        'thumbScriptUrl', 'pathDisclosureProtection', 'descriptionCacheExpiry',
                        'scriptExtension'
                );
                foreach ( $optionalSettings as $var ) {
                        if ( isset( $info[$var] ) ) {
                                $this->$var = $info[$var];
                        }
                }

                // Optional settings that have a default
                $this->initialCapital = isset( $info['initialCapital'] )
                        ? $info['initialCapital']
                        : MWNamespace::isCapitalized( NS_FILE );
                $this->url = isset( $info['url'] )
                        ? $info['url']
                        : false; // a subclass may set the URL (e.g. ForeignAPIRepo)
                if ( isset( $info['thumbUrl'] ) ) {
                        $this->thumbUrl = $info['thumbUrl'];
                } else {
                        $this->thumbUrl = $this->url ? "{$this->url}/thumb" : false;
                }
                $this->hashLevels = isset( $info['hashLevels'] )
                        ? $info['hashLevels']
                        : 2;
                $this->deletedHashLevels = isset( $info['deletedHashLevels'] )
                        ? $info['deletedHashLevels']
                        : $this->hashLevels;
                $this->transformVia404 = !empty( $info['transformVia404'] );
                $this->abbrvThreshold = isset( $info['abbrvThreshold'] )
                        ? $info['abbrvThreshold']
                        : 255;
                $this->isPrivate = !empty( $info['isPrivate'] );
                // Give defaults for the basic zones...
                $this->zones = isset( $info['zones'] ) ? $info['zones'] : array();
                foreach ( array( 'public', 'thumb', 'temp', 'deleted' ) as $zone ) {
                        if ( !isset( $this->zones[$zone]['container'] ) ) {
                                $this->zones[$zone]['container'] = "{$this->name}-{$zone}";
                        }
                        if ( !isset( $this->zones[$zone]['directory'] ) ) {
                                $this->zones[$zone]['directory'] = '';
                        }
                        if ( !isset( $this->zones[$zone]['urlsByExt'] ) ) {
                                $this->zones[$zone]['urlsByExt'] = array();
                        }
                }
        }

        public function getBackend() {
                return $this->backend;
        }

        public function getReadOnlyReason() {
                return $this->backend->getReadOnlyReason();
        }

        protected function initZones( $doZones = array() ) {
                $status = $this->newGood();
                foreach ( (array)$doZones as $zone ) {
                        $root = $this->getZonePath( $zone );
                        if ( $root === null ) {
                                throw new MWException( "No '$zone' zone defined in the {$this->name} repo." );
                        }
                }
                return $status;
        }

        public static function isVirtualUrl( $url ) {
                return substr( $url, 0, 9 ) == 'mwrepo://';
        }

        public function getVirtualUrl( $suffix = false ) {
                $path = 'mwrepo://' . $this->name;
                if ( $suffix !== false ) {
                        $path .= '/' . rawurlencode( $suffix );
                }
                return $path;
        }

        public function getZoneUrl( $zone, $ext = null ) {
                if ( in_array( $zone, array( 'public', 'temp', 'thumb' ) ) ) { // standard public zones
                        if ( $ext !== null && isset( $this->zones[$zone]['urlsByExt'][$ext] ) ) {
                                return $this->zones[$zone]['urlsByExt'][$ext]; // custom URL for extension/zone
                        } elseif ( isset( $this->zones[$zone]['url'] ) ) {
                                return $this->zones[$zone]['url']; // custom URL for zone
                        }
                }
                switch ( $zone ) {
                        case 'public':
                                return $this->url;
                        case 'temp':
                                return "{$this->url}/temp";
                        case 'deleted':
                                return false; // no public URL
                        case 'thumb':
                                return $this->thumbUrl;
                        default:
                                return false;
                }
        }

        public function getZoneHandlerUrl( $zone ) {
                if ( isset( $this->zones[$zone]['handlerUrl'] )
                        && in_array( $zone, array( 'public', 'temp', 'thumb' ) ) )
                {
                        return $this->zones[$zone]['handlerUrl'];
                }
                return false;
        }

        public function resolveVirtualUrl( $url ) {
                if ( substr( $url, 0, 9 ) != 'mwrepo://' ) {
                        throw new MWException( __METHOD__.': unknown protocol' );
                }
                $bits = explode( '/', substr( $url, 9 ), 3 );
                if ( count( $bits ) != 3 ) {
                        throw new MWException( __METHOD__.": invalid mwrepo URL: $url" );
                }
                list( $repo, $zone, $rel ) = $bits;
                if ( $repo !== $this->name ) {
                        throw new MWException( __METHOD__.": fetching from a foreign repo is not supported" );
                }
                $base = $this->getZonePath( $zone );
                if ( !$base ) {
                        throw new MWException( __METHOD__.": invalid zone: $zone" );
                }
                return $base . '/' . rawurldecode( $rel );
        }

        protected function getZoneLocation( $zone ) {
                if ( !isset( $this->zones[$zone] ) ) {
                        return array( null, null ); // bogus
                }
                return array( $this->zones[$zone]['container'], $this->zones[$zone]['directory'] );
        }

        public function getZonePath( $zone ) {
                list( $container, $base ) = $this->getZoneLocation( $zone );
                if ( $container === null || $base === null ) {
                        return null;
                }
                $backendName = $this->backend->getName();
                if ( $base != '' ) { // may not be set
                        $base = "/{$base}";
                }
                return "mwstore://$backendName/{$container}{$base}";
        }

        public function newFile( $title, $time = false ) {
                $title = File::normalizeTitle( $title );
                if ( !$title ) {
                        return null;
                }
                if ( $time ) {
                        if ( $this->oldFileFactory ) {
                                return call_user_func( $this->oldFileFactory, $title, $this, $time );
                        } else {
                                return false;
                        }
                } else {
                        return call_user_func( $this->fileFactory, $title, $this );
                }
        }

        public function findFile( $title, $options = array() ) {
                $title = File::normalizeTitle( $title );
                if ( !$title ) {
                        return false;
                }
                $time = isset( $options['time'] ) ? $options['time'] : false;
                # First try the current version of the file to see if it precedes the timestamp
                $img = $this->newFile( $title );
                if ( !$img ) {
                        return false;
                }
                if ( $img->exists() && ( !$time || $img->getTimestamp() == $time ) ) {
                        return $img;
                }
                # Now try an old version of the file
                if ( $time !== false ) {
                        $img = $this->newFile( $title, $time );
                        if ( $img && $img->exists() ) {
                                if ( !$img->isDeleted( File::DELETED_FILE ) ) {
                                        return $img; // always OK
                                } elseif ( !empty( $options['private'] ) && $img->userCan( File::DELETED_FILE ) ) {
                                        return $img;
                                }
                        }
                }

                # Now try redirects
                if ( !empty( $options['ignoreRedirect'] ) ) {
                        return false;
                }
                $redir = $this->checkRedirect( $title );
                if ( $redir && $title->getNamespace() == NS_FILE) {
                        $img = $this->newFile( $redir );
                        if ( !$img ) {
                                return false;
                        }
                        if ( $img->exists() ) {
                                $img->redirectedFrom( $title->getDBkey() );
                                return $img;
                        }
                }
                return false;
        }

        public function findFiles( array $items ) {
                $result = array();
                foreach ( $items as $item ) {
                        if ( is_array( $item ) ) {
                                $title = $item['title'];
                                $options = $item;
                                unset( $options['title'] );
                        } else {
                                $title = $item;
                                $options = array();
                        }
                        $file = $this->findFile( $title, $options );
                        if ( $file ) {
                                $result[$file->getTitle()->getDBkey()] = $file;
                        }
                }
                return $result;
        }

        public function findFileFromKey( $sha1, $options = array() ) {
                $time = isset( $options['time'] ) ? $options['time'] : false;
                # First try to find a matching current version of a file...
                if ( $this->fileFactoryKey ) {
                        $img = call_user_func( $this->fileFactoryKey, $sha1, $this, $time );
                } else {
                        return false; // find-by-sha1 not supported
                }
                if ( $img && $img->exists() ) {
                        return $img;
                }
                # Now try to find a matching old version of a file...
                if ( $time !== false && $this->oldFileFactoryKey ) { // find-by-sha1 supported?
                        $img = call_user_func( $this->oldFileFactoryKey, $sha1, $this, $time );
                        if ( $img && $img->exists() ) {
                                if ( !$img->isDeleted( File::DELETED_FILE ) ) {
                                        return $img; // always OK
                                } elseif ( !empty( $options['private'] ) && $img->userCan( File::DELETED_FILE ) ) {
                                        return $img;
                                }
                        }
                }
                return false;
        }

        public function findBySha1( $hash ) {
                return array();
        }

        public function findBySha1s( array $hashes ) {
                $result = array();
                foreach ( $hashes as $hash ) {
                        $files = $this->findBySha1( $hash );
                        if ( count( $files ) ) {
                                $result[$hash] = $files;
                        }
                }
                return $result;
        }

        public function getRootUrl() {
                return $this->getZoneUrl( 'public' );
        }

        public function getThumbScriptUrl() {
                return $this->thumbScriptUrl;
        }

        public function canTransformVia404() {
                return $this->transformVia404;
        }

        public function getNameFromTitle( Title $title ) {
                global $wgContLang;
                if ( $this->initialCapital != MWNamespace::isCapitalized( NS_FILE ) ) {
                        $name = $title->getUserCaseDBKey();
                        if ( $this->initialCapital ) {
                                $name = $wgContLang->ucfirst( $name );
                        }
                } else {
                        $name = $title->getDBkey();
                }
                return $name;
        }

        public function getRootDirectory() {
                return $this->getZonePath( 'public' );
        }

        public function getHashPath( $name ) {
                return self::getHashPathForLevel( $name, $this->hashLevels );
        }

        public function getTempHashPath( $suffix ) {
                $parts = explode( '!', $suffix, 2 ); // format is <timestamp>!<name> or just <name>
                $name = isset( $parts[1] ) ? $parts[1] : $suffix; // hash path is not based on timestamp
                return self::getHashPathForLevel( $name, $this->hashLevels );
        }

        protected static function getHashPathForLevel( $name, $levels ) {
                if ( $levels == 0 ) {
                        return '';
                } else {
                        $hash = md5( $name );
                        $path = '';
                        for ( $i = 1; $i <= $levels; $i++ ) {
                                $path .= substr( $hash, 0, $i ) . '/';
                        }
                        return $path;
                }
        }

        public function getHashLevels() {
                return $this->hashLevels;
        }

        public function getName() {
                return $this->name;
        }

        public function makeUrl( $query = '', $entry = 'index' ) {
                if ( isset( $this->scriptDirUrl ) ) {
                        $ext = isset( $this->scriptExtension ) ? $this->scriptExtension : '.php';
                        return wfAppendQuery( "{$this->scriptDirUrl}/{$entry}{$ext}", $query );
                }
                return false;
        }

        public function getDescriptionUrl( $name ) {
                $encName = wfUrlencode( $name );
                if ( !is_null( $this->descBaseUrl ) ) {
                        # "http://example.com/wiki/Image:"
                        return $this->descBaseUrl . $encName;
                }
                if ( !is_null( $this->articleUrl ) ) {
                        # "http://example.com/wiki/$1"
                        #
                        # We use "Image:" as the canonical namespace for
                        # compatibility across all MediaWiki versions.
                        return str_replace( '$1',
                                "Image:$encName", $this->articleUrl );
                }
                if ( !is_null( $this->scriptDirUrl ) ) {
                        # "http://example.com/w"
                        #
                        # We use "Image:" as the canonical namespace for
                        # compatibility across all MediaWiki versions,
                        # and just sort of hope index.php is right. ;)
                        return $this->makeUrl( "title=Image:$encName" );
                }
                return false;
        }

        public function getDescriptionRenderUrl( $name, $lang = null ) {
                $query = 'action=render';
                if ( !is_null( $lang ) ) {
                        $query .= '&uselang=' . $lang;
                }
                if ( isset( $this->scriptDirUrl ) ) {
                        return $this->makeUrl(
                                'title=' .
                                wfUrlencode( 'Image:' . $name ) .
                                "&$query" );
                } else {
                        $descUrl = $this->getDescriptionUrl( $name );
                        if ( $descUrl ) {
                                return wfAppendQuery( $descUrl, $query );
                        } else {
                                return false;
                        }
                }
        }

        public function getDescriptionStylesheetUrl() {
                if ( isset( $this->scriptDirUrl ) ) {
                        return $this->makeUrl( 'title=MediaWiki:Filepage.css&' .
                                wfArrayToCGI( Skin::getDynamicStylesheetQuery() ) );
                }
                return false;
        }

        public function store( $srcPath, $dstZone, $dstRel, $flags = 0 ) {
                $this->assertWritableRepo(); // fail out if read-only

                $status = $this->storeBatch( array( array( $srcPath, $dstZone, $dstRel ) ), $flags );
                if ( $status->successCount == 0 ) {
                        $status->ok = false;
                }

                return $status;
        }

        public function storeBatch( array $triplets, $flags = 0 ) {
                $this->assertWritableRepo(); // fail out if read-only

                $status = $this->newGood();
                $backend = $this->backend; // convenience

                $operations = array();
                $sourceFSFilesToDelete = array(); // cleanup for disk source files
                // Validate each triplet and get the store operation...
                foreach ( $triplets as $triplet ) {
                        list( $srcPath, $dstZone, $dstRel ) = $triplet;
                        wfDebug( __METHOD__
                                . "( \$src='$srcPath', \$dstZone='$dstZone', \$dstRel='$dstRel' )\n"
                        );

                        // Resolve destination path
                        $root = $this->getZonePath( $dstZone );
                        if ( !$root ) {
                                throw new MWException( "Invalid zone: $dstZone" );
                        }
                        if ( !$this->validateFilename( $dstRel ) ) {
                                throw new MWException( 'Validation error in $dstRel' );
                        }
                        $dstPath = "$root/$dstRel";
                        $dstDir  = dirname( $dstPath );
                        // Create destination directories for this triplet
                        if ( !$this->initDirectory( $dstDir )->isOK() ) {
                                return $this->newFatal( 'directorycreateerror', $dstDir );
                        }

                        // Resolve source to a storage path if virtual
                        $srcPath = $this->resolveToStoragePath( $srcPath );

                        // Get the appropriate file operation
                        if ( FileBackend::isStoragePath( $srcPath ) ) {
                                $opName = ( $flags & self::DELETE_SOURCE ) ? 'move' : 'copy';
                        } else {
                                $opName = 'store';
                                if ( $flags & self::DELETE_SOURCE ) {
                                        $sourceFSFilesToDelete[] = $srcPath;
                                }
                        }
                        $operations[] = array(
                                'op'            => $opName,
                                'src'           => $srcPath,
                                'dst'           => $dstPath,
                                'overwrite'     => $flags & self::OVERWRITE,
                                'overwriteSame' => $flags & self::OVERWRITE_SAME,
                        );
                }

                // Execute the store operation for each triplet
                $opts = array( 'force' => true );
                if ( $flags & self::SKIP_LOCKING ) {
                        $opts['nonLocking'] = true;
                }
                $status->merge( $backend->doOperations( $operations, $opts ) );
                // Cleanup for disk source files...
                foreach ( $sourceFSFilesToDelete as $file ) {
                        wfSuppressWarnings();
                        unlink( $file ); // FS cleanup
                        wfRestoreWarnings();
                }

                return $status;
        }

        public function cleanupBatch( array $files, $flags = 0 ) {
                $this->assertWritableRepo(); // fail out if read-only

                $status = $this->newGood();

                $operations = array();
                foreach ( $files as $path ) {
                        if ( is_array( $path ) ) {
                                // This is a pair, extract it
                                list( $zone, $rel ) = $path;
                                $path = $this->getZonePath( $zone ) . "/$rel";
                        } else {
                                // Resolve source to a storage path if virtual
                                $path = $this->resolveToStoragePath( $path );
                        }
                        $operations[] = array( 'op' => 'delete', 'src' => $path );
                }
                // Actually delete files from storage...
                $opts = array( 'force' => true );
                if ( $flags & self::SKIP_LOCKING ) {
                        $opts['nonLocking'] = true;
                }
                $status->merge( $this->backend->doOperations( $operations, $opts ) );

                return $status;
        }

        final public function quickImport( $src, $dst, $disposition = null ) {
                return $this->quickImportBatch( array( array( $src, $dst, $disposition ) ) );
        }

        final public function quickPurge( $path ) {
                return $this->quickPurgeBatch( array( $path ) );
        }

        public function quickCleanDir( $dir ) {
                $status = $this->newGood();
                $status->merge( $this->backend->clean(
                        array( 'dir' => $this->resolveToStoragePath( $dir ) ) ) );

                return $status;
        }

        public function quickImportBatch( array $triples ) {
                $status = $this->newGood();
                $operations = array();
                foreach ( $triples as $triple ) {
                        list( $src, $dst ) = $triple;
                        $src = $this->resolveToStoragePath( $src );
                        $dst = $this->resolveToStoragePath( $dst );
                        $operations[] = array(
                                'op'          => FileBackend::isStoragePath( $src ) ? 'copy' : 'store',
                                'src'         => $src,
                                'dst'         => $dst,
                                'disposition' => isset( $triple[2] ) ? $triple[2] : null
                        );
                        $status->merge( $this->initDirectory( dirname( $dst ) ) );
                }
                $status->merge( $this->backend->doQuickOperations( $operations ) );

                return $status;
        }

        public function quickPurgeBatch( array $paths ) {
                $status = $this->newGood();
                $operations = array();
                foreach ( $paths as $path ) {
                        $operations[] = array(
                                'op'                  => 'delete',
                                'src'                 => $this->resolveToStoragePath( $path ),
                                'ignoreMissingSource' => true
                        );
                }
                $status->merge( $this->backend->doQuickOperations( $operations ) );

                return $status;
        }

        public function storeTemp( $originalName, $srcPath ) {
                $this->assertWritableRepo(); // fail out if read-only

                $date       = gmdate( "YmdHis" );
                $hashPath   = $this->getHashPath( $originalName );
                $dstRel     = "{$hashPath}{$date}!{$originalName}";
                $dstUrlRel  = $hashPath . $date . '!' . rawurlencode( $originalName );
                $virtualUrl = $this->getVirtualUrl( 'temp' )  . '/' . $dstUrlRel;

                $result = $this->quickImport( $srcPath, $virtualUrl );
                $result->value = $virtualUrl;

                return $result;
        }

        public function freeTemp( $virtualUrl ) {
                $this->assertWritableRepo(); // fail out if read-only

                $temp = $this->getVirtualUrl( 'temp' );
                if ( substr( $virtualUrl, 0, strlen( $temp ) ) != $temp ) {
                        wfDebug( __METHOD__.": Invalid temp virtual URL\n" );
                        return false;
                }

                return $this->quickPurge( $virtualUrl )->isOK();
        }

        public function concatenate( array $srcPaths, $dstPath, $flags = 0 ) {
                $this->assertWritableRepo(); // fail out if read-only

                $status = $this->newGood();

                $sources = array();
                foreach ( $srcPaths as $srcPath ) {
                        // Resolve source to a storage path if virtual
                        $source = $this->resolveToStoragePath( $srcPath );
                        $sources[] = $source; // chunk to merge
                }

                // Concatenate the chunks into one FS file
                $params = array( 'srcs' => $sources, 'dst' => $dstPath );
                $status->merge( $this->backend->concatenate( $params ) );
                if ( !$status->isOK() ) {
                        return $status;
                }

                // Delete the sources if required
                if ( $flags & self::DELETE_SOURCE ) {
                        $status->merge( $this->quickPurgeBatch( $srcPaths ) );
                }

                // Make sure status is OK, despite any quickPurgeBatch() fatals
                $status->setResult( true );

                return $status;
        }

        public function publish( $srcPath, $dstRel, $archiveRel, $flags = 0 ) {
                $this->assertWritableRepo(); // fail out if read-only

                $status = $this->publishBatch( array( array( $srcPath, $dstRel, $archiveRel ) ), $flags );
                if ( $status->successCount == 0 ) {
                        $status->ok = false;
                }
                if ( isset( $status->value[0] ) ) {
                        $status->value = $status->value[0];
                } else {
                        $status->value = false;
                }

                return $status;
        }

        public function publishBatch( array $triplets, $flags = 0 ) {
                $this->assertWritableRepo(); // fail out if read-only

                $backend = $this->backend; // convenience
                // Try creating directories
                $status = $this->initZones( 'public' );
                if ( !$status->isOK() ) {
                        return $status;
                }

                $status = $this->newGood( array() );

                $operations = array();
                $sourceFSFilesToDelete = array(); // cleanup for disk source files
                // Validate each triplet and get the store operation...
                foreach ( $triplets as $i => $triplet ) {
                        list( $srcPath, $dstRel, $archiveRel ) = $triplet;
                        // Resolve source to a storage path if virtual
                        $srcPath = $this->resolveToStoragePath( $srcPath );
                        if ( !$this->validateFilename( $dstRel ) ) {
                                throw new MWException( 'Validation error in $dstRel' );
                        }
                        if ( !$this->validateFilename( $archiveRel ) ) {
                                throw new MWException( 'Validation error in $archiveRel' );
                        }

                        $publicRoot = $this->getZonePath( 'public' );
                        $dstPath = "$publicRoot/$dstRel";
                        $archivePath = "$publicRoot/$archiveRel";

                        $dstDir = dirname( $dstPath );
                        $archiveDir = dirname( $archivePath );
                        // Abort immediately on directory creation errors since they're likely to be repetitive
                        if ( !$this->initDirectory( $dstDir )->isOK() ) {
                                return $this->newFatal( 'directorycreateerror', $dstDir );
                        }
                        if ( !$this->initDirectory($archiveDir )->isOK() ) {
                                return $this->newFatal( 'directorycreateerror', $archiveDir );
                        }

                        // Archive destination file if it exists.
                        // This will check if the archive file also exists and fail if does.
                        // This is a sanity check to avoid data loss. On Windows and Linux,
                        // copy() will overwrite, so the existence check is vulnerable to
                        // race conditions unless an functioning LockManager is used.
                        // LocalFile also uses SELECT FOR UPDATE for synchronization.
                        $operations[] = array(
                                'op'                  => 'copy',
                                'src'                 => $dstPath,
                                'dst'                 => $archivePath,
                                'ignoreMissingSource' => true
                        );

                        // Copy (or move) the source file to the destination
                        if ( FileBackend::isStoragePath( $srcPath ) ) {
                                if ( $flags & self::DELETE_SOURCE ) {
                                        $operations[] = array(
                                                'op'           => 'move',
                                                'src'          => $srcPath,
                                                'dst'          => $dstPath,
                                                'overwrite'    => true // replace current
                                        );
                                } else {
                                        $operations[] = array(
                                                'op'           => 'copy',
                                                'src'          => $srcPath,
                                                'dst'          => $dstPath,
                                                'overwrite'    => true // replace current
                                        );
                                }
                        } else { // FS source path
                                $operations[] = array(
                                        'op'           => 'store',
                                        'src'          => $srcPath,
                                        'dst'          => $dstPath,
                                        'overwrite'    => true // replace current
                                );
                                if ( $flags & self::DELETE_SOURCE ) {
                                        $sourceFSFilesToDelete[] = $srcPath;
                                }
                        }
                }

                // Execute the operations for each triplet
                $status->merge( $backend->doOperations( $operations ) );
                // Find out which files were archived...
                foreach ( $triplets as $i => $triplet ) {
                        list( $srcPath, $dstRel, $archiveRel ) = $triplet;
                        $archivePath = $this->getZonePath( 'public' ) . "/$archiveRel";
                        if ( $this->fileExists( $archivePath ) ) {
                                $status->value[$i] = 'archived';
                        } else {
                                $status->value[$i] = 'new';
                        }
                }
                // Cleanup for disk source files...
                foreach ( $sourceFSFilesToDelete as $file ) {
                        wfSuppressWarnings();
                        unlink( $file ); // FS cleanup
                        wfRestoreWarnings();
                }

                return $status;
        }

        protected function initDirectory( $dir ) {
                $path = $this->resolveToStoragePath( $dir );
                list( $b, $container, $r ) = FileBackend::splitStoragePath( $path );

                $params = array( 'dir' => $path );
                if ( $this->isPrivate || $container === $this->zones['deleted']['container'] ) {
                        # Take all available measures to prevent web accessibility of new deleted
                        # directories, in case the user has not configured offline storage
                        $params = array( 'noAccess' => true, 'noListing' => true ) + $params;
                }

                return $this->backend->prepare( $params );
        }

        public function cleanDir( $dir ) {
                $this->assertWritableRepo(); // fail out if read-only

                $status = $this->newGood();
                $status->merge( $this->backend->clean(
                        array( 'dir' => $this->resolveToStoragePath( $dir ) ) ) );

                return $status;
        }

        public function fileExists( $file ) {
                $result = $this->fileExistsBatch( array( $file ) );
                return $result[0];
        }

        public function fileExistsBatch( array $files ) {
                $result = array();
                foreach ( $files as $key => $file ) {
                        $file = $this->resolveToStoragePath( $file );
                        $result[$key] = $this->backend->fileExists( array( 'src' => $file ) );
                }
                return $result;
        }

        public function delete( $srcRel, $archiveRel ) {
                $this->assertWritableRepo(); // fail out if read-only

                return $this->deleteBatch( array( array( $srcRel, $archiveRel ) ) );
        }

        public function deleteBatch( array $sourceDestPairs ) {
                $this->assertWritableRepo(); // fail out if read-only

                // Try creating directories
                $status = $this->initZones( array( 'public', 'deleted' ) );
                if ( !$status->isOK() ) {
                        return $status;
                }

                $status = $this->newGood();

                $backend = $this->backend; // convenience
                $operations = array();
                // Validate filenames and create archive directories
                foreach ( $sourceDestPairs as $pair ) {
                        list( $srcRel, $archiveRel ) = $pair;
                        if ( !$this->validateFilename( $srcRel ) ) {
                                throw new MWException( __METHOD__.':Validation error in $srcRel' );
                        } elseif ( !$this->validateFilename( $archiveRel ) ) {
                                throw new MWException( __METHOD__.':Validation error in $archiveRel' );
                        }

                        $publicRoot = $this->getZonePath( 'public' );
                        $srcPath = "{$publicRoot}/$srcRel";

                        $deletedRoot = $this->getZonePath( 'deleted' );
                        $archivePath = "{$deletedRoot}/{$archiveRel}";
                        $archiveDir = dirname( $archivePath ); // does not touch FS

                        // Create destination directories
                        if ( !$this->initDirectory( $archiveDir )->isOK() ) {
                                return $this->newFatal( 'directorycreateerror', $archiveDir );
                        }

                        $operations[] = array(
                                'op'            => 'move',
                                'src'           => $srcPath,
                                'dst'           => $archivePath,
                                // We may have 2+ identical files being deleted,
                                // all of which will map to the same destination file
                                'overwriteSame' => true // also see bug 31792
                        );
                }

                // Move the files by execute the operations for each pair.
                // We're now committed to returning an OK result, which will
                // lead to the files being moved in the DB also.
                $opts = array( 'force' => true );
                $status->merge( $backend->doOperations( $operations, $opts ) );

                return $status;
        }

        public function cleanupDeletedBatch( array $storageKeys ) {
                $this->assertWritableRepo();
        }

        public function getDeletedHashPath( $key ) {
                if ( strlen( $key ) < 31 ) {
                        throw new MWException( "Invalid storage key '$key'." );
                }
                $path = '';
                for ( $i = 0; $i < $this->deletedHashLevels; $i++ ) {
                        $path .= $key[$i] . '/';
                }
                return $path;
        }

        protected function resolveToStoragePath( $path ) {
                if ( $this->isVirtualUrl( $path ) ) {
                        return $this->resolveVirtualUrl( $path );
                }
                return $path;
        }

        public function getLocalCopy( $virtualUrl ) {
                $path = $this->resolveToStoragePath( $virtualUrl );
                return $this->backend->getLocalCopy( array( 'src' => $path ) );
        }

        public function getLocalReference( $virtualUrl ) {
                $path = $this->resolveToStoragePath( $virtualUrl );
                return $this->backend->getLocalReference( array( 'src' => $path ) );
        }

        public function getFileProps( $virtualUrl ) {
                $path = $this->resolveToStoragePath( $virtualUrl );
                return $this->backend->getFileProps( array( 'src' => $path ) );
        }

        public function getFileTimestamp( $virtualUrl ) {
                $path = $this->resolveToStoragePath( $virtualUrl );
                return $this->backend->getFileTimestamp( array( 'src' => $path ) );
        }

        public function getFileSha1( $virtualUrl ) {
                $path = $this->resolveToStoragePath( $virtualUrl );
                return $this->backend->getFileSha1Base36( array( 'src' => $path ) );
        }

        public function streamFile( $virtualUrl, $headers = array() ) {
                $path = $this->resolveToStoragePath( $virtualUrl );
                $params = array( 'src' => $path, 'headers' => $headers );
                return $this->backend->streamFile( $params )->isOK();
        }

        public function enumFiles( $callback ) {
                $this->enumFilesInStorage( $callback );
        }

        protected function enumFilesInStorage( $callback ) {
                $publicRoot = $this->getZonePath( 'public' );
                $numDirs = 1 << ( $this->hashLevels * 4 );
                // Use a priori assumptions about directory structure
                // to reduce the tree height of the scanning process.
                for ( $flatIndex = 0; $flatIndex < $numDirs; $flatIndex++ ) {
                        $hexString = sprintf( "%0{$this->hashLevels}x", $flatIndex );
                        $path = $publicRoot;
                        for ( $hexPos = 0; $hexPos < $this->hashLevels; $hexPos++ ) {
                                $path .= '/' . substr( $hexString, 0, $hexPos + 1 );
                        }
                        $iterator = $this->backend->getFileList( array( 'dir' => $path ) );
                        foreach ( $iterator as $name ) {
                                // Each item returned is a public file
                                call_user_func( $callback, "{$path}/{$name}" );
                        }
                }
        }

        public function validateFilename( $filename ) {
                if ( strval( $filename ) == '' ) {
                        return false;
                }
                return FileBackend::isPathTraversalFree( $filename );
        }

        function getErrorCleanupFunction() {
                switch ( $this->pathDisclosureProtection ) {
                        case 'none':
                        case 'simple': // b/c
                                $callback = array( $this, 'passThrough' );
                                break;
                        default: // 'paranoid'
                                $callback = array( $this, 'paranoidClean' );
                }
                return $callback;
        }

        function paranoidClean( $param ) {
                return '[hidden]';
        }

        function passThrough( $param ) {
                return $param;
        }

        public function newFatal( $message /*, parameters...*/ ) {
                $params = func_get_args();
                array_unshift( $params, $this );
                return MWInit::callStaticMethod( 'FileRepoStatus', 'newFatal', $params );
        }

        public function newGood( $value = null ) {
                return FileRepoStatus::newGood( $this, $value );
        }

        public function checkRedirect( Title $title ) {
                return false;
        }

        public function invalidateImageRedirect( Title $title ) {}

        public function getDisplayName() {
                // We don't name our own repo, return nothing
                if ( $this->isLocal() ) {
                        return null;
                }
                // 'shared-repo-name-wikimediacommons' is used when $wgUseInstantCommons = true
                return wfMessageFallback( 'shared-repo-name-' . $this->name, 'shared-repo' )->text();
        }

        public function nameForThumb( $name ) {
                if ( strlen( $name ) > $this->abbrvThreshold ) {
                        $ext  = FileBackend::extensionFromPath( $name );
                        $name = ( $ext == '' ) ? 'thumbnail' : "thumbnail.$ext";
                }
                return $name;
        }

        public function isLocal() {
                return $this->getName() == 'local';
        }

        public function getSharedCacheKey( /*...*/ ) {
                return false;
        }

        public function getLocalCacheKey( /*...*/ ) {
                $args = func_get_args();
                array_unshift( $args, 'filerepo', $this->getName() );
                return call_user_func_array( 'wfMemcKey', $args );
        }

        public function getTempRepo() {
                return new TempFileRepo( array(
                        'name'      => "{$this->name}-temp",
                        'backend'   => $this->backend,
                        'zones'     => array(
                                'public' => array(
                                        'container' => $this->zones['temp']['container'],
                                        'directory' => $this->zones['temp']['directory']
                                ),
                                'thumb'  => array(
                                        'container' => $this->zones['thumb']['container'],
                                        'directory' => ( $this->zones['thumb']['directory'] == '' )
                                                ? 'temp'
                                                : $this->zones['thumb']['directory'] . '/temp'
                                )
                        ),
                        'url'        => $this->getZoneUrl( 'temp' ),
                        'thumbUrl'   => $this->getZoneUrl( 'thumb' ) . '/temp',
                        'hashLevels' => $this->hashLevels // performance
                ) );
        }

        public function getUploadStash() {
                return new UploadStash( $this );
        }

        protected function assertWritableRepo() {}
}

class TempFileRepo extends FileRepo {
        public function getTempRepo() {
                throw new MWException( "Cannot get a temp repo from a temp repo." );
        }
}