1 files changed, 72 insertions, 0 deletions
diff --git a/includes/externalstore/ExternalStoreMwstore.php b/includes/externalstore/ExternalStoreMwstore.php
new file mode 100644
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--- /dev/null
+++ b/includes/externalstore/ExternalStoreMwstore.php
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+<?php
+/**
+ * External storage in a file backend.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+/**
+ * File backend accessable external objects.
+ *
+ * In this system, each store "location" maps to the name of a file backend.
+ * The file backends must be defined in $wgFileBackends and must be global
+ * and fully qualified with a global "wikiId" prefix in the configuration.
+ *
+ * @ingroup ExternalStorage
+ * @since 1.21
+ */
+class ExternalStoreMwstore extends ExternalStoreMedium {
+	/**
+	 * The URL returned is of the form of the form mwstore://backend/container/wiki/id
+	 *
+	 * @see ExternalStoreMedium::fetchFromURL()
+	 */
+	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;
+	}
+
+	/**
+	 * @see ExternalStoreMedium::store()
+	 */
+	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;
+	}
+}