includes/filerepo/FileBackendDBRepoWrapper.php

   1 <?php
   2 /**
   3  * Proxy backend that manages file layout rewriting for FileRepo.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup FileRepo
  22  * @ingroup FileBackend
  23  * @author Aaron Schulz
  24  */
  25
  26 /**
  27  * @brief Proxy backend that manages file layout rewriting for FileRepo.
  28  *
  29  * LocalRepo may be configured to store files under their title names or by SHA-1.
  30  * This acts as a shim in the later case, providing backwards compatability for
  31  * most callers. All "public"/"deleted" zone files actually go in an "original"
  32  * container and are never changed.
  33  *
  34  * This requires something like thumb_handler.php and img_auth.php for client viewing of files.
  35  *
  36  * @ingroup FileRepo
  37  * @ingroup FileBackend
  38  * @since 1.25
  39  */
  40 class FileBackendDBRepoWrapper extends FileBackend {
  41         /** @var FileBackend */
  42         protected $backend;
  43         /** @var string */
  44         protected $repoName;
  45         /** @var Closure */
  46         protected $dbHandleFunc;
  47         /** @var ProcessCacheLRU */
  48         protected $resolvedPathCache;
  49         /** @var DBConnRef[] */
  50         protected $dbs;
  51
  52         public function __construct( array $config ) {
  53                 $config['name'] = $config['backend']->getName();
  54                 $config['wikiId'] = $config['backend']->getWikiId();
  55                 parent::__construct( $config );
  56                 $this->backend = $config['backend'];
  57                 $this->repoName = $config['repoName'];
  58                 $this->dbHandleFunc = $config['dbHandleFactory'];
  59                 $this->resolvedPathCache = new ProcessCacheLRU( 100 );
  60         }
  61
  62         /**
  63          * Get the underlying FileBackend that is being wrapped
  64          *
  65          * @return FileBackend
  66          */
  67         public function getInternalBackend() {
  68                 return $this->backend;
  69         }
  70
  71         /**
  72          * Translate a legacy "title" path to it's "sha1" counterpart
  73          *
  74          * E.g. mwstore://local-backend/local-public/a/ab/<name>.jpg
  75          * => mwstore://local-backend/local-original/x/y/z/<sha1>.jpg
  76          *
  77          * @param string $path
  78          * @param bool $latest
  79          * @return string
  80          */
  81         public function getBackendPath( $path, $latest = true ) {
  82                 $paths = $this->getBackendPaths( array( $path ), $latest );
  83                 return current( $paths );
  84         }
  85
  86         /**
  87          * Translate legacy "title" paths to their "sha1" counterparts
  88          *
  89          * E.g. mwstore://local-backend/local-public/a/ab/<name>.jpg
  90          * => mwstore://local-backend/local-original/x/y/z/<sha1>.jpg
  91          *
  92          * @param array $paths
  93          * @param bool $latest
  94          * @return array Translated paths in same order
  95          */
  96         public function getBackendPaths( array $paths, $latest = true ) {
  97                 $db = $this->getDB( $latest ? DB_MASTER : DB_SLAVE );
  98
  99                 // @TODO: batching
 100                 $resolved = array();
 101                 foreach ( $paths as $i => $path ) {
 102                         if ( !$latest && $this->resolvedPathCache->has( $path, 'target', 10 ) ) {
 103                                 $resolved[$i] = $this->resolvedPathCache->get( $path, 'target' );
 104                                 continue;
 105                         }
 106
 107                         list( , $container ) = FileBackend::splitStoragePath( $path );
 108
 109                         if ( $container === "{$this->repoName}-public" ) {
 110                                 $name = basename( $path );
 111                                 if ( strpos( $path, '!' ) !== false ) {
 112                                         $sha1 = $db->selectField( 'oldimage', 'oi_sha1',
 113                                                 array( 'oi_archive_name' => $name ),
 114                                                 __METHOD__
 115                                         );
 116                                 } else {
 117                                         $sha1 = $db->selectField( 'image', 'img_sha1',
 118                                                 array( 'img_name' => $name ),
 119                                                 __METHOD__
 120                                         );
 121                                 }
 122                                 if ( !strlen( $sha1 ) ) {
 123                                         $resolved[$i] = $path; // give up
 124                                         continue;
 125                                 }
 126                                 $resolved[$i] = $this->getPathForSHA1( $sha1 );
 127                                 $this->resolvedPathCache->set( $path, 'target', $resolved[$i] );
 128                         } elseif ( $container === "{$this->repoName}-deleted" ) {
 129                                 $name = basename( $path ); // <hash>.<ext>
 130                                 $sha1 = substr( $name, 0, strpos( $name, '.' ) ); // ignore extension
 131                                 $resolved[$i] = $this->getPathForSHA1( $sha1 );
 132                                 $this->resolvedPathCache->set( $path, 'target', $resolved[$i] );
 133                         } else {
 134                                 $resolved[$i] = $path;
 135                         }
 136                 }
 137
 138                 $res = array();
 139                 foreach ( $paths as $i => $path ) {
 140                         $res[$i] = $resolved[$i];
 141                 }
 142
 143                 return $res;
 144         }
 145
 146         protected function doOperationsInternal( array $ops, array $opts ) {
 147                 return $this->backend->doOperationsInternal( $this->mungeOpPaths( $ops ), $opts );
 148         }
 149
 150         protected function doQuickOperationsInternal( array $ops ) {
 151                 return $this->backend->doQuickOperationsInternal( $this->mungeOpPaths( $ops ) );
 152         }
 153
 154         protected function doPrepare( array $params ) {
 155                 return $this->backend->doPrepare( $params );
 156         }
 157
 158         protected function doSecure( array $params ) {
 159                 return $this->backend->doSecure( $params );
 160         }
 161
 162         protected function doPublish( array $params ) {
 163                 return $this->backend->doPublish( $params );
 164         }
 165
 166         protected function doClean( array $params ) {
 167                 return $this->backend->doClean( $params );
 168         }
 169
 170         public function concatenate( array $params ) {
 171                 return $this->translateSrcParams( __FUNCTION__, $params );
 172         }
 173
 174         public function fileExists( array $params ) {
 175                 return $this->translateSrcParams( __FUNCTION__, $params );
 176         }
 177
 178         public function getFileTimestamp( array $params ) {
 179                 return $this->translateSrcParams( __FUNCTION__, $params );
 180         }
 181
 182         public function getFileSize( array $params ) {
 183                 return $this->translateSrcParams( __FUNCTION__, $params );
 184         }
 185
 186         public function getFileStat( array $params ) {
 187                 return $this->translateSrcParams( __FUNCTION__, $params );
 188         }
 189
 190         public function getFileXAttributes( array $params ) {
 191                 return $this->translateSrcParams( __FUNCTION__, $params );
 192         }
 193
 194         public function getFileSha1Base36( array $params ) {
 195                 return $this->translateSrcParams( __FUNCTION__, $params );
 196         }
 197
 198         public function getFileProps( array $params ) {
 199                 return $this->translateSrcParams( __FUNCTION__, $params );
 200         }
 201
 202         public function streamFile( array $params ) {
 203                 // The stream methods use the file extension to determine the
 204                 // Content-Type (as MediaWiki should already validate it on upload).
 205                 // The translated SHA1 path has no extension, so this needs to use
 206                 // the untranslated path extension.
 207                 $type = StreamFile::contentTypeFromPath( $params['src'] );
 208                 if ( $type && $type != 'unknown/unknown' ) {
 209                         $params['headers'][] = "Content-type: $type";
 210                 }
 211                 return $this->translateSrcParams( __FUNCTION__, $params );
 212         }
 213
 214         public function getFileContentsMulti( array $params ) {
 215                 return $this->translateArrayResults( __FUNCTION__, $params );
 216         }
 217
 218         public function getLocalReferenceMulti( array $params ) {
 219                 return $this->translateArrayResults( __FUNCTION__, $params );
 220         }
 221
 222         public function getLocalCopyMulti( array $params ) {
 223                 return $this->translateArrayResults( __FUNCTION__, $params );
 224         }
 225
 226         public function getFileHttpUrl( array $params ) {
 227                 return $this->translateSrcParams( __FUNCTION__, $params );
 228         }
 229
 230         public function directoryExists( array $params ) {
 231                 return $this->backend->directoryExists( $params );
 232         }
 233
 234         public function getDirectoryList( array $params ) {
 235                 return $this->backend->getDirectoryList( $params );
 236         }
 237
 238         public function getFileList( array $params ) {
 239                 return $this->backend->getFileList( $params );
 240         }
 241
 242         public function getFeatures() {
 243                 return $this->backend->getFeatures();
 244         }
 245
 246         public function clearCache( array $paths = null ) {
 247                 $this->backend->clearCache( null ); // clear all
 248         }
 249
 250         public function preloadCache( array $paths ) {
 251                 $paths = $this->getBackendPaths( $paths );
 252                 $this->backend->preloadCache( $paths );
 253         }
 254
 255         public function preloadFileStat( array $params ) {
 256                 return $this->translateSrcParams( __FUNCTION__, $params );
 257         }
 258
 259         public function getScopedLocksForOps( array $ops, Status $status ) {
 260                 return $this->backend->getScopedLocksForOps( $ops, $status );
 261         }
 262
 263         /**
 264          * Get the ultimate original storage path for a file
 265          *
 266          * Use this when putting a new file into the system
 267          *
 268          * @param string $sha1 File SHA-1 base36
 269          * @return string
 270          */
 271         public function getPathForSHA1( $sha1 ) {
 272                 if ( strlen( $sha1 ) < 3 ) {
 273                         throw new InvalidArgumentException( "Invalid file SHA-1." );
 274                 }
 275                 return $this->backend->getContainerStoragePath( "{$this->repoName}-original" ) .
 276                         "/{$sha1[0]}/{$sha1[1]}/{$sha1[2]}/{$sha1}";
 277         }
 278
 279         /**
 280          * Get a connection to the repo file registry DB
 281          *
 282          * @param integer $index
 283          * @return DBConnRef
 284          */
 285         protected function getDB( $index ) {
 286                 if ( !isset( $this->dbs[$index] ) ) {
 287                         $func = $this->dbHandleFunc;
 288                         $this->dbs[$index] = $func( $index );
 289                 }
 290                 return $this->dbs[$index];
 291         }
 292
 293         /**
 294          * Translates paths found in the "src" or "srcs" keys of a params array
 295          *
 296          * @param string $function
 297          * @param array $params
 298          */
 299         protected function translateSrcParams( $function, array $params ) {
 300                 $latest = !empty( $params['latest'] );
 301
 302                 if ( isset( $params['src'] ) ) {
 303                         $params['src'] = $this->getBackendPath( $params['src'], $latest );
 304                 }
 305
 306                 if ( isset( $params['srcs'] ) ) {
 307                         $params['srcs'] = $this->getBackendPaths( $params['srcs'], $latest );
 308                 }
 309
 310                 return $this->backend->$function( $params );
 311         }
 312
 313         /**
 314          * Translates paths when the backend function returns results keyed by paths
 315          *
 316          * @param string $function
 317          * @param array $params
 318          * @return array
 319          */
 320         protected function translateArrayResults( $function, array $params ) {
 321                 $origPaths = $params['srcs'];
 322                 $params['srcs'] = $this->getBackendPaths( $params['srcs'], !empty( $params['latest'] ) );
 323                 $pathMap = array_combine( $params['srcs'], $origPaths );
 324
 325                 $results = $this->backend->$function( $params );
 326
 327                 $contents = array();
 328                 foreach ( $results as $path => $result ) {
 329                         $contents[$pathMap[$path]] = $result;
 330                 }
 331
 332                 return $contents;
 333         }
 334
 335         /**
 336          * Translate legacy "title" source paths to their "sha1" counterparts
 337          *
 338          * This leaves destination paths alone since we don't want those to mutate
 339          *
 340          * @param array $ops
 341          * @return array
 342          */
 343         protected function mungeOpPaths( array $ops ) {
 344                 // Ops that use 'src' and do not mutate core file data there
 345                 static $srcRefOps = array( 'store', 'copy', 'describe' );
 346                 foreach ( $ops as &$op ) {
 347                         if ( isset( $op['src'] ) && in_array( $op['op'], $srcRefOps ) ) {
 348                                 $op['src'] = $this->getBackendPath( $op['src'], true );
 349                         }
 350                         if ( isset( $op['srcs'] ) ) {
 351                                 $op['srcs'] = $this->getBackendPaths( $op['srcs'], true );
 352                         }
 353                 }
 354                 return $ops;
 355         }
 356 }