HistoryBlobStub.php

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<?php
// NO_NAMESPACE Compatibility with serialized objects in permanent storage
 
use MediaWiki\MediaWikiServices;
 
class HistoryBlobStub {
    protected static $blobCache = [];
 
    protected $mOldId;
 
    protected $mHash;
 
    protected $mRef;
 
    public function __construct( $hash = '', $oldid = 0 ) {
        $this->mHash = $hash;
    }
 
    public function setLocation( $id ) {
        $this->mOldId = $id;
    }
 
    public function getLocation() {
        return $this->mOldId;
    }
 
    public function setReferrer( $id ) {
        $this->mRef = $id;
    }
 
    public function getReferrer() {
        return $this->mRef;
    }
 
    public function getText() {
        if ( isset( self::$blobCache[$this->mOldId] ) ) {
            $obj = self::$blobCache[$this->mOldId];
        } else {
            $dbr = MediaWikiServices::getInstance()->getConnectionProvider()->getReplicaDatabase();
            $row = $dbr->newSelectQueryBuilder()
                ->select( [ 'old_flags', 'old_text' ] )
                ->from( 'text' )
                ->where( [ 'old_id' => $this->mOldId ] )
                ->caller( __METHOD__ )->fetchRow();
 
            if ( !$row ) {
                return false;
            }
 
            $flags = explode( ',', $row->old_flags );
            if ( in_array( 'external', $flags ) ) {
                $url = $row->old_text;
                $parts = explode( '://', $url, 2 );
                if ( !isset( $parts[1] ) || $parts[1] == '' ) {
                    return false;
                }
                $row->old_text = MediaWikiServices::getInstance()
                    ->getExternalStoreAccess()
                    ->fetchFromURL( $url );
            }
 
            if ( !in_array( 'object', $flags ) ) {
                return false;
            }
 
            if ( in_array( 'gzip', $flags ) ) {
                // This shouldn't happen, but a bug in the compress script
                // may at times gzip-compress a HistoryBlob object row.
                $obj = HistoryBlobUtils::unserialize( gzinflate( $row->old_text ), true );
            } else {
                $obj = HistoryBlobUtils::unserialize( $row->old_text, true );
            }
 
            // Save this item for reference; if pulling many
            // items in a row we'll likely use it again.
            self::$blobCache = [ $this->mOldId => $obj ];
        }
 
        if ( method_exists( $obj, 'getItem' ) ) {
            return $obj->getItem( $this->mHash );
        }
 
        return false;
    }
 
    public function getHash() {
        return $this->mHash;
    }
}
 
// Blobs generated by MediaWiki < 1.5 on PHP 4 were serialized with the
// class name coerced to lowercase. We can improve efficiency by adding
// autoload entries for the lowercase variants of these classes (T166759).
// The code below is never executed, but it is picked up by the AutoloadGenerator
// parser, which scans for class_alias() calls.
/*
class_alias( HistoryBlobStub::class, 'historyblobstub' );
*/