includes/filerepo/RepoGroup.php

   1 <?php
   2 /**
   3  * Prioritized list of file repositories.
   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  */
  23
  24 /**
  25  * Prioritized list of file repositories
  26  *
  27  * @ingroup FileRepo
  28  */
  29 class RepoGroup {
  30         /** @var LocalRepo */
  31         protected $localRepo;
  32
  33         /** @var FileRepo[] */
  34         protected $foreignRepos;
  35
  36         /** @var bool */
  37         protected $reposInitialised = false;
  38
  39         /** @var array */
  40         protected $localInfo;
  41
  42         /** @var array */
  43         protected $foreignInfo;
  44
  45         /** @var ProcessCacheLRU */
  46         protected $cache;
  47
  48         /** @var RepoGroup */
  49         protected static $instance;
  50
  51         /** Maximum number of cache items */
  52         const MAX_CACHE_SIZE = 500;
  53
  54         /**
  55          * Get a RepoGroup instance. At present only one instance of RepoGroup is
  56          * needed in a MediaWiki invocation, this may change in the future.
  57          * @return RepoGroup
  58          */
  59         static function singleton() {
  60                 if ( self::$instance ) {
  61                         return self::$instance;
  62                 }
  63                 global $wgLocalFileRepo, $wgForeignFileRepos;
  64                 self::$instance = new RepoGroup( $wgLocalFileRepo, $wgForeignFileRepos );
  65
  66                 return self::$instance;
  67         }
  68
  69         /**
  70          * Destroy the singleton instance, so that a new one will be created next
  71          * time singleton() is called.
  72          */
  73         static function destroySingleton() {
  74                 self::$instance = null;
  75         }
  76
  77         /**
  78          * Set the singleton instance to a given object
  79          * Used by extensions which hook into the Repo chain.
  80          * It's not enough to just create a superclass ... you have
  81          * to get people to call into it even though all they know is RepoGroup::singleton()
  82          *
  83          * @param RepoGroup $instance
  84          */
  85         static function setSingleton( $instance ) {
  86                 self::$instance = $instance;
  87         }
  88
  89         /**
  90          * Construct a group of file repositories.
  91          *
  92          * @param array $localInfo Associative array for local repo's info
  93          * @param array $foreignInfo Array of repository info arrays.
  94          *   Each info array is an associative array with the 'class' member
  95          *   giving the class name. The entire array is passed to the repository
  96          *   constructor as the first parameter.
  97          */
  98         function __construct( $localInfo, $foreignInfo ) {
  99                 $this->localInfo = $localInfo;
 100                 $this->foreignInfo = $foreignInfo;
 101                 $this->cache = new MapCacheLRU( self::MAX_CACHE_SIZE );
 102         }
 103
 104         /**
 105          * Search repositories for an image.
 106          * You can also use wfFindFile() to do this.
 107          *
 108          * @param Title|string $title Title object or string
 109          * @param array $options Associative array of options:
 110          *   time:           requested time for an archived image, or false for the
 111          *                   current version. An image object will be returned which was
 112          *                   created at the specified time.
 113          *   ignoreRedirect: If true, do not follow file redirects
 114          *   private:        If true, return restricted (deleted) files if the current
 115          *                   user is allowed to view them. Otherwise, such files will not
 116          *                   be found.
 117          *   latest:         If true, load from the latest available data into File objects
 118          * @return File|bool False if title is not found
 119          */
 120         function findFile( $title, $options = [] ) {
 121                 if ( !is_array( $options ) ) {
 122                         // MW 1.15 compat
 123                         $options = [ 'time' => $options ];
 124                 }
 125                 if ( isset( $options['bypassCache'] ) ) {
 126                         $options['latest'] = $options['bypassCache']; // b/c
 127                 }
 128                 $options += [ 'time' => false ];
 129
 130                 if ( !$this->reposInitialised ) {
 131                         $this->initialiseRepos();
 132                 }
 133
 134                 $title = File::normalizeTitle( $title );
 135                 if ( !$title ) {
 136                         return false;
 137                 }
 138
 139                 # Check the cache
 140                 $dbkey = $title->getDBkey();
 141                 $timeKey = is_string( $options['time'] ) ? $options['time'] : '';
 142                 if ( empty( $options['ignoreRedirect'] )
 143                         && empty( $options['private'] )
 144                         && empty( $options['latest'] )
 145                 ) {
 146                         if ( $this->cache->hasField( $dbkey, $timeKey, 60 ) ) {
 147                                 return $this->cache->getField( $dbkey, $timeKey );
 148                         }
 149                         $useCache = true;
 150                 } else {
 151                         $useCache = false;
 152                 }
 153
 154                 # Check the local repo
 155                 $image = $this->localRepo->findFile( $title, $options );
 156
 157                 # Check the foreign repos
 158                 if ( !$image ) {
 159                         foreach ( $this->foreignRepos as $repo ) {
 160                                 $image = $repo->findFile( $title, $options );
 161                                 if ( $image ) {
 162                                         break;
 163                                 }
 164                         }
 165                 }
 166
 167                 $image = $image ?: false; // type sanity
 168                 # Cache file existence or non-existence
 169                 if ( $useCache && ( !$image || $image->isCacheable() ) ) {
 170                         $this->cache->setField( $dbkey, $timeKey, $image );
 171                 }
 172
 173                 return $image;
 174         }
 175
 176         /**
 177          * Search repositories for many files at once.
 178          *
 179          * @param array $inputItems An array of titles, or an array of findFile() options with
 180          *    the "title" option giving the title. Example:
 181          *
 182          *     $findItem = [ 'title' => $title, 'private' => true ];
 183          *     $findBatch = [ $findItem ];
 184          *     $repo->findFiles( $findBatch );
 185          *
 186          *    No title should appear in $items twice, as the result use titles as keys
 187          * @param int $flags Supports:
 188          *     - FileRepo::NAME_AND_TIME_ONLY : return a (search title => (title,timestamp)) map.
 189          *       The search title uses the input titles; the other is the final post-redirect title.
 190          *       All titles are returned as string DB keys and the inner array is associative.
 191          * @return array Map of (file name => File objects) for matches
 192          */
 193         function findFiles( array $inputItems, $flags = 0 ) {
 194                 if ( !$this->reposInitialised ) {
 195                         $this->initialiseRepos();
 196                 }
 197
 198                 $items = [];
 199                 foreach ( $inputItems as $item ) {
 200                         if ( !is_array( $item ) ) {
 201                                 $item = [ 'title' => $item ];
 202                         }
 203                         $item['title'] = File::normalizeTitle( $item['title'] );
 204                         if ( $item['title'] ) {
 205                                 $items[$item['title']->getDBkey()] = $item;
 206                         }
 207                 }
 208
 209                 $images = $this->localRepo->findFiles( $items, $flags );
 210
 211                 foreach ( $this->foreignRepos as $repo ) {
 212                         // Remove found files from $items
 213                         foreach ( $images as $name => $image ) {
 214                                 unset( $items[$name] );
 215                         }
 216
 217                         $images = array_merge( $images, $repo->findFiles( $items, $flags ) );
 218                 }
 219
 220                 return $images;
 221         }
 222
 223         /**
 224          * Interface for FileRepo::checkRedirect()
 225          * @param Title $title
 226          * @return bool|Title
 227          */
 228         function checkRedirect( Title $title ) {
 229                 if ( !$this->reposInitialised ) {
 230                         $this->initialiseRepos();
 231                 }
 232
 233                 $redir = $this->localRepo->checkRedirect( $title );
 234                 if ( $redir ) {
 235                         return $redir;
 236                 }
 237
 238                 foreach ( $this->foreignRepos as $repo ) {
 239                         $redir = $repo->checkRedirect( $title );
 240                         if ( $redir ) {
 241                                 return $redir;
 242                         }
 243                 }
 244
 245                 return false;
 246         }
 247
 248         /**
 249          * Find an instance of the file with this key, created at the specified time
 250          * Returns false if the file does not exist.
 251          *
 252          * @param string $hash Base 36 SHA-1 hash
 253          * @param array $options Option array, same as findFile()
 254          * @return File|bool File object or false if it is not found
 255          */
 256         function findFileFromKey( $hash, $options = [] ) {
 257                 if ( !$this->reposInitialised ) {
 258                         $this->initialiseRepos();
 259                 }
 260
 261                 $file = $this->localRepo->findFileFromKey( $hash, $options );
 262                 if ( !$file ) {
 263                         foreach ( $this->foreignRepos as $repo ) {
 264                                 $file = $repo->findFileFromKey( $hash, $options );
 265                                 if ( $file ) {
 266                                         break;
 267                                 }
 268                         }
 269                 }
 270
 271                 return $file;
 272         }
 273
 274         /**
 275          * Find all instances of files with this key
 276          *
 277          * @param string $hash Base 36 SHA-1 hash
 278          * @return File[]
 279          */
 280         function findBySha1( $hash ) {
 281                 if ( !$this->reposInitialised ) {
 282                         $this->initialiseRepos();
 283                 }
 284
 285                 $result = $this->localRepo->findBySha1( $hash );
 286                 foreach ( $this->foreignRepos as $repo ) {
 287                         $result = array_merge( $result, $repo->findBySha1( $hash ) );
 288                 }
 289                 usort( $result, 'File::compare' );
 290
 291                 return $result;
 292         }
 293
 294         /**
 295          * Find all instances of files with this keys
 296          *
 297          * @param array $hashes Base 36 SHA-1 hashes
 298          * @return array Array of array of File objects
 299          */
 300         function findBySha1s( array $hashes ) {
 301                 if ( !$this->reposInitialised ) {
 302                         $this->initialiseRepos();
 303                 }
 304
 305                 $result = $this->localRepo->findBySha1s( $hashes );
 306                 foreach ( $this->foreignRepos as $repo ) {
 307                         $result = array_merge_recursive( $result, $repo->findBySha1s( $hashes ) );
 308                 }
 309                 // sort the merged (and presorted) sublist of each hash
 310                 foreach ( $result as $hash => $files ) {
 311                         usort( $result[$hash], 'File::compare' );
 312                 }
 313
 314                 return $result;
 315         }
 316
 317         /**
 318          * Get the repo instance with a given key.
 319          * @param string|int $index
 320          * @return bool|LocalRepo
 321          */
 322         function getRepo( $index ) {
 323                 if ( !$this->reposInitialised ) {
 324                         $this->initialiseRepos();
 325                 }
 326                 if ( $index === 'local' ) {
 327                         return $this->localRepo;
 328                 }
 329                 return $this->foreignRepos[$index] ?? false;
 330         }
 331
 332         /**
 333          * Get the repo instance by its name
 334          * @param string $name
 335          * @return FileRepo|bool
 336          */
 337         function getRepoByName( $name ) {
 338                 if ( !$this->reposInitialised ) {
 339                         $this->initialiseRepos();
 340                 }
 341                 foreach ( $this->foreignRepos as $repo ) {
 342                         if ( $repo->name == $name ) {
 343                                 return $repo;
 344                         }
 345                 }
 346
 347                 return false;
 348         }
 349
 350         /**
 351          * Get the local repository, i.e. the one corresponding to the local image
 352          * table. Files are typically uploaded to the local repository.
 353          *
 354          * @return LocalRepo
 355          */
 356         function getLocalRepo() {
 357                 return $this->getRepo( 'local' );
 358         }
 359
 360         /**
 361          * Call a function for each foreign repo, with the repo object as the
 362          * first parameter.
 363          *
 364          * @param callable $callback The function to call
 365          * @param array $params Optional additional parameters to pass to the function
 366          * @return bool
 367          */
 368         function forEachForeignRepo( $callback, $params = [] ) {
 369                 if ( !$this->reposInitialised ) {
 370                         $this->initialiseRepos();
 371                 }
 372                 foreach ( $this->foreignRepos as $repo ) {
 373                         if ( $callback( $repo, ...$params ) ) {
 374                                 return true;
 375                         }
 376                 }
 377
 378                 return false;
 379         }
 380
 381         /**
 382          * Does the installation have any foreign repos set up?
 383          * @return bool
 384          */
 385         function hasForeignRepos() {
 386                 if ( !$this->reposInitialised ) {
 387                         $this->initialiseRepos();
 388                 }
 389                 return (bool)$this->foreignRepos;
 390         }
 391
 392         /**
 393          * Initialise the $repos array
 394          */
 395         function initialiseRepos() {
 396                 if ( $this->reposInitialised ) {
 397                         return;
 398                 }
 399                 $this->reposInitialised = true;
 400
 401                 $this->localRepo = $this->newRepo( $this->localInfo );
 402                 $this->foreignRepos = [];
 403                 foreach ( $this->foreignInfo as $key => $info ) {
 404                         $this->foreignRepos[$key] = $this->newRepo( $info );
 405                 }
 406         }
 407
 408         /**
 409          * Create a repo class based on an info structure
 410          * @param array $info
 411          * @return FileRepo
 412          */
 413         protected function newRepo( $info ) {
 414                 $class = $info['class'];
 415
 416                 return new $class( $info );
 417         }
 418
 419         /**
 420          * Split a virtual URL into repo, zone and rel parts
 421          * @param string $url
 422          * @throws MWException
 423          * @return string[] Containing repo, zone and rel
 424          */
 425         function splitVirtualUrl( $url ) {
 426                 if ( substr( $url, 0, 9 ) != 'mwrepo://' ) {
 427                         throw new MWException( __METHOD__ . ': unknown protocol' );
 428                 }
 429
 430                 $bits = explode( '/', substr( $url, 9 ), 3 );
 431                 if ( count( $bits ) != 3 ) {
 432                         throw new MWException( __METHOD__ . ": invalid mwrepo URL: $url" );
 433                 }
 434
 435                 return $bits;
 436         }
 437
 438         /**
 439          * @param string $fileName
 440          * @return array
 441          */
 442         function getFileProps( $fileName ) {
 443                 if ( FileRepo::isVirtualUrl( $fileName ) ) {
 444                         list( $repoName, /* $zone */, /* $rel */ ) = $this->splitVirtualUrl( $fileName );
 445                         if ( $repoName === '' ) {
 446                                 $repoName = 'local';
 447                         }
 448                         $repo = $this->getRepo( $repoName );
 449
 450                         return $repo->getFileProps( $fileName );
 451                 } else {
 452                         $mwProps = new MWFileProps( MediaWiki\MediaWikiServices::getInstance()->getMimeAnalyzer() );
 453
 454                         return $mwProps->getPropsFromPath( $fileName, true );
 455                 }
 456         }
 457
 458         /**
 459          * Clear RepoGroup process cache used for finding a file
 460          * @param Title|null $title Title of the file or null to clear all files
 461          */
 462         public function clearCache( Title $title = null ) {
 463                 if ( $title == null ) {
 464                         $this->cache->clear();
 465                 } else {
 466                         $this->cache->clear( $title->getDBkey() );
 467                 }
 468         }
 469 }