includes/filerepo/RepoGroup.php

   1 <?php
   2
   3 /**
   4  * Prioritized list of file repositories
   5  * @addtogroup filerepo
   6  */
   7 class RepoGroup {
   8         var $localRepo, $foreignRepos, $reposInitialised = false;
   9         var $localInfo, $foreignInfo;
  10
  11         protected static $instance;
  12
  13         /**
  14          * Get a RepoGroup instance. At present only one instance of RepoGroup is
  15          * needed in a MediaWiki invocation, this may change in the future.
  16          */
  17         static function singleton() {
  18                 if ( self::$instance ) {
  19                         return self::$instance;
  20                 }
  21                 global $wgLocalFileRepo, $wgForeignFileRepos;
  22                 self::$instance = new RepoGroup( $wgLocalFileRepo, $wgForeignFileRepos );
  23                 return self::$instance;
  24         }
  25
  26         /**
  27          * Destroy the singleton instance, so that a new one will be created next
  28          * time singleton() is called.
  29          */
  30         static function destroySingleton() {
  31                 self::$instance = null;
  32         }
  33
  34         /**
  35          * Construct a group of file repositories.
  36          * @param array $data Array of repository info arrays.
  37          *     Each info array is an associative array with the 'class' member
  38          *     giving the class name. The entire array is passed to the repository
  39          *     constructor as the first parameter.
  40          */
  41         function __construct( $localInfo, $foreignInfo ) {
  42                 $this->localInfo = $localInfo;
  43                 $this->foreignInfo = $foreignInfo;
  44         }
  45
  46         /**
  47          * Search repositories for an image.
  48          * You can also use wfGetFile() to do this.
  49          * @param mixed $title Title object or string
  50          * @param mixed $time The 14-char timestamp before which the file should
  51          *                    have been uploaded, or false for the current version
  52          * @return File object or false if it is not found
  53          */
  54         function findFile( $title, $time = false ) {
  55                 if ( !$this->reposInitialised ) {
  56                         $this->initialiseRepos();
  57                 }
  58
  59                 $image = $this->localRepo->findFile( $title, $time );
  60                 if ( $image ) {
  61                         return $image;
  62                 }
  63                 foreach ( $this->foreignRepos as $repo ) {
  64                         $image = $repo->findFile( $title, $time );
  65                         if ( $image ) {
  66                                 return $image;
  67                         }
  68                 }
  69                 return false;
  70         }
  71
  72         /**
  73          * Get the repo instance with a given key.
  74          */
  75         function getRepo( $index ) {
  76                 if ( !$this->reposInitialised ) {
  77                         $this->initialiseRepos();
  78                 }
  79                 if ( $index == 'local' ) {
  80                         return $this->localRepo;
  81                 } elseif ( isset( $this->foreignRepos[$index] ) ) {
  82                         return $this->foreignRepos[$index];
  83                 } else {
  84                         return false;
  85                 }
  86         }
  87
  88         /**
  89          * Get the local repository, i.e. the one corresponding to the local image
  90          * table. Files are typically uploaded to the local repository.
  91          */
  92         function getLocalRepo() {
  93                 return $this->getRepo( 'local' );
  94         }
  95
  96         /**
  97          * Initialise the $repos array
  98          */
  99         function initialiseRepos() {
 100                 if ( $this->reposInitialised ) {
 101                         return;
 102                 }
 103                 $this->reposInitialised = true;
 104
 105                 $this->localRepo = $this->newRepo( $this->localInfo );
 106                 $this->foreignRepos = array();
 107                 foreach ( $this->foreignInfo as $key => $info ) {
 108                         $this->foreignRepos[$key] = $this->newRepo( $info );
 109                 }
 110         }
 111
 112         /**
 113          * Create a repo class based on an info structure
 114          */
 115         protected function newRepo( $info ) {
 116                 $class = $info['class'];
 117                 return new $class( $info );
 118         }
 119
 120         /**
 121          * Split a virtual URL into repo, zone and rel parts
 122          * @return an array containing repo, zone and rel
 123          */
 124         function splitVirtualUrl( $url ) {
 125                 if ( substr( $url, 0, 9 ) != 'mwrepo://' ) {
 126                         throw new MWException( __METHOD__.': unknown protoocl' );
 127                 }
 128
 129                 $bits = explode( '/', substr( $url, 9 ), 3 );
 130                 if ( count( $bits ) != 3 ) {
 131                         throw new MWException( __METHOD__.": invalid mwrepo URL: $url" );
 132                 }
 133                 return $bits;
 134         }
 135
 136         function getFileProps( $fileName ) {
 137                 if ( FileRepo::isVirtualUrl( $fileName ) ) {
 138                         list( $repoName, $zone, $rel ) = $this->splitVirtualUrl( $fileName );
 139                         if ( $repoName === '' ) {
 140                                 $repoName = 'local';
 141                         }
 142                         $repo = $this->getRepo( $repoName );
 143                         return $repo->getFileProps( $fileName );
 144                 } else {
 145                         return File::getPropsFromPath( $fileName );
 146                 }
 147         }
 148 }
 149
 150 ?>