includes/filerepo/RepoGroup.php

   1 <?php
   2 /**
   3  * @defgroup FileRepo FileRepo
   4  *
   5  * @file
   6  * @ingroup FileRepo
   7  */
   8
   9 /**
  10  * @ingroup FileRepo
  11  * Prioritized list of file repositories
  12  */
  13 class RepoGroup {
  14         var $localRepo, $foreignRepos, $reposInitialised = false;
  15         var $localInfo, $foreignInfo;
  16
  17         protected static $instance;
  18
  19         /**
  20          * Get a RepoGroup instance. At present only one instance of RepoGroup is
  21          * needed in a MediaWiki invocation, this may change in the future.
  22          */
  23         static function singleton() {
  24                 if ( self::$instance ) {
  25                         return self::$instance;
  26                 }
  27                 global $wgLocalFileRepo, $wgForeignFileRepos;
  28                 self::$instance = new RepoGroup( $wgLocalFileRepo, $wgForeignFileRepos );
  29                 return self::$instance;
  30         }
  31
  32         /**
  33          * Destroy the singleton instance, so that a new one will be created next
  34          * time singleton() is called.
  35          */
  36         static function destroySingleton() {
  37                 self::$instance = null;
  38         }
  39
  40         /**
  41          * Set the singleton instance to a given object
  42          */
  43         static function setSingleton( $instance ) {
  44                 self::$instance = $instance;
  45         }
  46
  47         /**
  48          * Construct a group of file repositories.
  49          * @param array $data Array of repository info arrays.
  50          *     Each info array is an associative array with the 'class' member
  51          *     giving the class name. The entire array is passed to the repository
  52          *     constructor as the first parameter.
  53          */
  54         function __construct( $localInfo, $foreignInfo ) {
  55                 $this->localInfo = $localInfo;
  56                 $this->foreignInfo = $foreignInfo;
  57         }
  58
  59         /**
  60          * Search repositories for an image.
  61          * You can also use wfGetFile() to do this.
  62          * @param mixed $title Title object or string
  63          * @param mixed $time The 14-char timestamp the file should have
  64          *                    been uploaded, or false for the current version
  65          * @param mixed $flags FileRepo::FIND_ flags
  66          * @return File object or false if it is not found
  67          */
  68         function findFile( $title, $time = false, $flags = 0 ) {
  69                 if ( !$this->reposInitialised ) {
  70                         $this->initialiseRepos();
  71                 }
  72
  73                 $image = $this->localRepo->findFile( $title, $time, $flags );
  74                 if ( $image ) {
  75                         return $image;
  76                 }
  77                 foreach ( $this->foreignRepos as $repo ) {
  78                         $image = $repo->findFile( $title, $time, $flags );
  79                         if ( $image ) {
  80                                 return $image;
  81                         }
  82                 }
  83                 return false;
  84         }
  85         function findFiles( $titles, $flags = 0 ) {
  86                 if ( !$this->reposInitialised ) {
  87                         $this->initialiseRepos();
  88                 }
  89
  90                 $titleObjs = array();
  91                 foreach ( $titles as $title ) {
  92                         if ( !( $title instanceof Title ) )
  93                                 $title = Title::makeTitleSafe( NS_IMAGE, $title );
  94                         $titleObjs[$title->getDBkey()] = $title;
  95                 }
  96
  97                 $images = $this->localRepo->findFiles( $titleObjs, $flags );
  98
  99                 foreach ( $this->foreignRepos as $repo ) {
 100                         // Remove found files from $titleObjs
 101                         foreach ( $images as $name => $image )
 102                                 if ( isset( $titleObjs[$name] ) )
 103                                         unset( $titleObjs[$name] );
 104
 105                         $images = array_merge( $images, $repo->findFiles( $titleObjs, $flags ) );
 106                 }
 107                 return $images;
 108         }
 109
 110         /**
 111          * Interface for FileRepo::checkRedirect()
 112          */
 113         function checkRedirect( $title ) {
 114                 if ( !$this->reposInitialised ) {
 115                         $this->initialiseRepos();
 116                 }
 117
 118                 $redir = $this->localRepo->checkRedirect( $title );
 119                 if( $redir ) {
 120                         return $redir;
 121                 }
 122                 foreach ( $this->foreignRepos as $repo ) {
 123                         $redir = $repo->checkRedirect( $title );
 124                         if ( $redir ) {
 125                                 return $redir;
 126                         }
 127                 }
 128                 return false;
 129         }
 130
 131         function findBySha1( $hash ) {
 132                 if ( !$this->reposInitialised ) {
 133                         $this->initialiseRepos();
 134                 }
 135
 136                 $result = $this->localRepo->findBySha1( $hash );
 137                 foreach ( $this->foreignRepos as $repo )
 138                         $result = array_merge( $result, $repo->findBySha1( $hash ) );
 139                 return $result;
 140         }
 141
 142         /**
 143          * Get the repo instance with a given key.
 144          */
 145         function getRepo( $index ) {
 146                 if ( !$this->reposInitialised ) {
 147                         $this->initialiseRepos();
 148                 }
 149                 if ( $index === 'local' ) {
 150                         return $this->localRepo;
 151                 } elseif ( isset( $this->foreignRepos[$index] ) ) {
 152                         return $this->foreignRepos[$index];
 153                 } else {
 154                         return false;
 155                 }
 156         }
 157         /**
 158          * Get the repo instance by its name
 159          */
 160         function getRepoByName( $name ) {
 161                 if ( !$this->reposInitialised ) {
 162                         $this->initialiseRepos();
 163                 }
 164                 foreach ( $this->foreignRepos as $key => $repo ) {
 165                         if ( $repo->name == $name)
 166                                 return $repo;
 167                 }
 168                 return false;
 169         }
 170
 171         /**
 172          * Get the local repository, i.e. the one corresponding to the local image
 173          * table. Files are typically uploaded to the local repository.
 174          */
 175         function getLocalRepo() {
 176                 return $this->getRepo( 'local' );
 177         }
 178
 179         function forEachForeignRepo( $callback, $params = array() ) {
 180                 foreach( $this->foreignRepos as $repo ) {
 181                         $args = array_merge( array( $repo ), $params );
 182                         if( call_user_func_array( $callback, $args ) ) {
 183                                 return true;
 184                         }
 185                 }
 186                 return false;
 187         }
 188
 189         function hasForeignRepos() {
 190                 return !empty( $this->foreignRepos );
 191         }
 192
 193         /**
 194          * Initialise the $repos array
 195          */
 196         function initialiseRepos() {
 197                 if ( $this->reposInitialised ) {
 198                         return;
 199                 }
 200                 $this->reposInitialised = true;
 201
 202                 $this->localRepo = $this->newRepo( $this->localInfo );
 203                 $this->foreignRepos = array();
 204                 foreach ( $this->foreignInfo as $key => $info ) {
 205                         $this->foreignRepos[$key] = $this->newRepo( $info );
 206                 }
 207         }
 208
 209         /**
 210          * Create a repo class based on an info structure
 211          */
 212         protected function newRepo( $info ) {
 213                 $class = $info['class'];
 214                 return new $class( $info );
 215         }
 216
 217         /**
 218          * Split a virtual URL into repo, zone and rel parts
 219          * @return an array containing repo, zone and rel
 220          */
 221         function splitVirtualUrl( $url ) {
 222                 if ( substr( $url, 0, 9 ) != 'mwrepo://' ) {
 223                         throw new MWException( __METHOD__.': unknown protoocl' );
 224                 }
 225
 226                 $bits = explode( '/', substr( $url, 9 ), 3 );
 227                 if ( count( $bits ) != 3 ) {
 228                         throw new MWException( __METHOD__.": invalid mwrepo URL: $url" );
 229                 }
 230                 return $bits;
 231         }
 232
 233         function getFileProps( $fileName ) {
 234                 if ( FileRepo::isVirtualUrl( $fileName ) ) {
 235                         list( $repoName, /* $zone */, /* $rel */ ) = $this->splitVirtualUrl( $fileName );
 236                         if ( $repoName === '' ) {
 237                                 $repoName = 'local';
 238                         }
 239                         $repo = $this->getRepo( $repoName );
 240                         return $repo->getFileProps( $fileName );
 241                 } else {
 242                         return File::getPropsFromPath( $fileName );
 243                 }
 244         }
 245 }