339 lines
8.4 KiB
PHP
339 lines
8.4 KiB
PHP
<?php
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/**
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* Prioritized list of file repositories
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*
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* @file
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* @ingroup FileRepo
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*/
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/**
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* @defgroup FileRepo FileRepo
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*/
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/**
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* Prioritized list of file repositories
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*
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* @ingroup FileRepo
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*/
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class RepoGroup {
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var $localRepo, $foreignRepos, $reposInitialised = false;
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var $localInfo, $foreignInfo;
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var $cache;
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protected static $instance;
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const MAX_CACHE_SIZE = 1000;
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/**
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* Get a RepoGroup instance. At present only one instance of RepoGroup is
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* needed in a MediaWiki invocation, this may change in the future.
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*/
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static function singleton() {
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if ( self::$instance ) {
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return self::$instance;
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}
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global $wgLocalFileRepo, $wgForeignFileRepos;
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self::$instance = new RepoGroup( $wgLocalFileRepo, $wgForeignFileRepos );
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return self::$instance;
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}
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/**
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* Destroy the singleton instance, so that a new one will be created next
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* time singleton() is called.
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*/
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static function destroySingleton() {
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self::$instance = null;
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}
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/**
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* Set the singleton instance to a given object
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*/
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static function setSingleton( $instance ) {
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self::$instance = $instance;
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}
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/**
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* Construct a group of file repositories.
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*
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* @param $localInfo Associative array for local repo's info
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* @param $foreignInfo Array of repository info arrays.
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* Each info array is an associative array with the 'class' member
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* giving the class name. The entire array is passed to the repository
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* constructor as the first parameter.
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*/
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function __construct( $localInfo, $foreignInfo ) {
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$this->localInfo = $localInfo;
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$this->foreignInfo = $foreignInfo;
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$this->cache = array();
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}
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/**
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* Search repositories for an image.
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* You can also use wfFindFile() to do this.
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*
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* @param $title Mixed: Title object or string
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* @param $options Associative array of options:
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* time: requested time for an archived image, or false for the
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* current version. An image object will be returned which was
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* created at the specified time.
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*
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* ignoreRedirect: If true, do not follow file redirects
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*
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* private: If true, return restricted (deleted) files if the current
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* user is allowed to view them. Otherwise, such files will not
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* be found.
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*
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* bypassCache: If true, do not use the process-local cache of File objects
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* @return File object or false if it is not found
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*/
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function findFile( $title, $options = array() ) {
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if ( !is_array( $options ) ) {
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// MW 1.15 compat
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$options = array( 'time' => $options );
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}
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if ( !$this->reposInitialised ) {
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$this->initialiseRepos();
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}
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if ( !($title instanceof Title) ) {
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$title = Title::makeTitleSafe( NS_FILE, $title );
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if ( !is_object( $title ) ) {
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return false;
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}
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}
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# Check the cache
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if ( empty( $options['ignoreRedirect'] )
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&& empty( $options['private'] )
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&& empty( $options['bypassCache'] ) )
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{
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$useCache = true;
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$time = isset( $options['time'] ) ? $options['time'] : '';
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$dbkey = $title->getDBkey();
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if ( isset( $this->cache[$dbkey][$time] ) ) {
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wfDebug( __METHOD__.": got File:$dbkey from process cache\n" );
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# Move it to the end of the list so that we can delete the LRU entry later
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$tmp = $this->cache[$dbkey];
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unset( $this->cache[$dbkey] );
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$this->cache[$dbkey] = $tmp;
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# Return the entry
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return $this->cache[$dbkey][$time];
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} else {
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# Add a negative cache entry, may be overridden
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$this->trimCache();
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$this->cache[$dbkey][$time] = false;
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$cacheEntry =& $this->cache[$dbkey][$time];
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}
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} else {
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$useCache = false;
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}
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# Check the local repo
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$image = $this->localRepo->findFile( $title, $options );
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if ( $image ) {
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if ( $useCache ) {
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$cacheEntry = $image;
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}
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return $image;
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}
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# Check the foreign repos
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foreach ( $this->foreignRepos as $repo ) {
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$image = $repo->findFile( $title, $options );
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if ( $image ) {
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if ( $useCache ) {
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$cacheEntry = $image;
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}
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return $image;
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}
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}
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# Not found, do not override negative cache
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return false;
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}
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function findFiles( $inputItems ) {
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if ( !$this->reposInitialised ) {
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$this->initialiseRepos();
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}
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$items = array();
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foreach ( $inputItems as $item ) {
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if ( !is_array( $item ) ) {
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$item = array( 'title' => $item );
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}
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if ( !( $item['title'] instanceof Title ) )
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$item['title'] = Title::makeTitleSafe( NS_FILE, $item['title'] );
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if ( $item['title'] )
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$items[$item['title']->getDBkey()] = $item;
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}
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$images = $this->localRepo->findFiles( $items );
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foreach ( $this->foreignRepos as $repo ) {
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// Remove found files from $items
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foreach ( $images as $name => $image ) {
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unset( $items[$name] );
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}
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$images = array_merge( $images, $repo->findFiles( $items ) );
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}
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return $images;
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}
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/**
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* Interface for FileRepo::checkRedirect()
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*/
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function checkRedirect( $title ) {
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if ( !$this->reposInitialised ) {
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$this->initialiseRepos();
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}
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$redir = $this->localRepo->checkRedirect( $title );
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if( $redir ) {
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return $redir;
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}
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foreach ( $this->foreignRepos as $repo ) {
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$redir = $repo->checkRedirect( $title );
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if ( $redir ) {
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return $redir;
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}
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}
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return false;
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}
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function findBySha1( $hash ) {
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if ( !$this->reposInitialised ) {
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$this->initialiseRepos();
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}
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$result = $this->localRepo->findBySha1( $hash );
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foreach ( $this->foreignRepos as $repo )
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$result = array_merge( $result, $repo->findBySha1( $hash ) );
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return $result;
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}
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/**
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* Get the repo instance with a given key.
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*/
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function getRepo( $index ) {
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if ( !$this->reposInitialised ) {
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$this->initialiseRepos();
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}
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if ( $index === 'local' ) {
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return $this->localRepo;
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} elseif ( isset( $this->foreignRepos[$index] ) ) {
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return $this->foreignRepos[$index];
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} else {
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return false;
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}
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}
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/**
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* Get the repo instance by its name
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*/
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function getRepoByName( $name ) {
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if ( !$this->reposInitialised ) {
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$this->initialiseRepos();
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}
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foreach ( $this->foreignRepos as $key => $repo ) {
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if ( $repo->name == $name)
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return $repo;
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}
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return false;
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}
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/**
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* Get the local repository, i.e. the one corresponding to the local image
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* table. Files are typically uploaded to the local repository.
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*/
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function getLocalRepo() {
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return $this->getRepo( 'local' );
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}
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/**
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* Call a function for each foreign repo, with the repo object as the
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* first parameter.
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*
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* @param $callback Callback: the function to call
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* @param $params Array: optional additional parameters to pass to the function
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*/
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function forEachForeignRepo( $callback, $params = array() ) {
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foreach( $this->foreignRepos as $repo ) {
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$args = array_merge( array( $repo ), $params );
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if( call_user_func_array( $callback, $args ) ) {
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return true;
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}
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}
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return false;
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}
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/**
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* Does the installation have any foreign repos set up?
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* @return Boolean
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*/
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function hasForeignRepos() {
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return (bool)$this->foreignRepos;
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}
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/**
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* Initialise the $repos array
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*/
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function initialiseRepos() {
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if ( $this->reposInitialised ) {
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return;
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}
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$this->reposInitialised = true;
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$this->localRepo = $this->newRepo( $this->localInfo );
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$this->foreignRepos = array();
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foreach ( $this->foreignInfo as $key => $info ) {
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$this->foreignRepos[$key] = $this->newRepo( $info );
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}
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}
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/**
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* Create a repo class based on an info structure
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*/
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protected function newRepo( $info ) {
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$class = $info['class'];
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return new $class( $info );
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}
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/**
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* Split a virtual URL into repo, zone and rel parts
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* @return an array containing repo, zone and rel
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*/
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function splitVirtualUrl( $url ) {
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if ( substr( $url, 0, 9 ) != 'mwrepo://' ) {
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throw new MWException( __METHOD__.': unknown protoocl' );
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}
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$bits = explode( '/', substr( $url, 9 ), 3 );
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if ( count( $bits ) != 3 ) {
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throw new MWException( __METHOD__.": invalid mwrepo URL: $url" );
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}
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return $bits;
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}
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function getFileProps( $fileName ) {
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if ( FileRepo::isVirtualUrl( $fileName ) ) {
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list( $repoName, /* $zone */, /* $rel */ ) = $this->splitVirtualUrl( $fileName );
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if ( $repoName === '' ) {
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$repoName = 'local';
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}
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$repo = $this->getRepo( $repoName );
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return $repo->getFileProps( $fileName );
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} else {
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return File::getPropsFromPath( $fileName );
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}
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}
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/**
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* Limit cache memory
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*/
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function trimCache() {
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while ( count( $this->cache ) >= self::MAX_CACHE_SIZE ) {
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reset( $this->cache );
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$key = key( $this->cache );
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wfDebug( __METHOD__.": evicting $key\n" );
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unset( $this->cache[$key] );
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}
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}
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}
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