ExternalStoreMwstore.php

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<?php
class ExternalStoreMwstore extends ExternalStoreMedium {
        public function fetchFromURL( $url ) {
                $be = FileBackendGroup::singleton()->backendFromPath( $url );
                if ( $be instanceof FileBackend ) {
                        // We don't need "latest" since objects are immutable and
                        // backends should at least have "read-after-create" consistency.
                        return $be->getFileContents( array( 'src' => $url ) );
                }
                return false;
        }

        public function store( $backend, $data ) {
                $be = FileBackendGroup::singleton()->get( $backend );
                if ( $be instanceof FileBackend ) {
                        // Get three random base 36 characters to act as shard directories
                        $rand = wfBaseConvert( mt_rand( 0, 46655 ), 10, 36, 3 );
                        // Make sure ID is roughly lexicographically increasing for performance
                        $id = str_pad( UIDGenerator::newTimestampedUID128( 32 ), 26, '0', STR_PAD_LEFT );
                        // Segregate items by wiki ID for the sake of bookkeeping
                        $wiki = isset( $this->params['wiki'] ) ? $this->params['wiki'] : wfWikiID();

                        $url = $be->getContainerStoragePath( 'data' ) . '/' .
                                rawurlencode( $wiki ) . "/{$rand[0]}/{$rand[1]}/{$rand[2]}/{$id}";

                        $be->prepare( array( 'dir' => dirname( $url ), 'noAccess' => 1, 'noListing' => 1 ) );
                        if ( $be->create( array( 'dst' => $url, 'content' => $data ) )->isOK() ) {
                                return $url;
                        }
                }
                return false;
        }
}