Move SwiftFileBackend to /libs

Change-Id: Ied0be9891d70930caf415d75cb3b89043347f47e

1 files changed, 0 insertions, 1937 deletions

diff --git a/includes/filebackend/SwiftFileBackend.php b/includes/filebackend/SwiftFileBackend.php
deleted file mode 100644
index 4bc0ce69dcd4..000000000000
--- a/includes/filebackend/SwiftFileBackend.php
+++ /dev/null
@@ -1,1937 +0,0 @@
-<?php
-/**
- * OpenStack Swift based 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
- * @ingroup FileBackend
- * @author Russ Nelson
- * @author Aaron Schulz
- */
-
-/**
- * @brief Class for an OpenStack Swift (or Ceph RGW) based file backend.
- *
- * StatusValue messages should avoid mentioning the Swift account name.
- * Likewise, error suppression should be used to avoid path disclosure.
- *
- * @ingroup FileBackend
- * @since 1.19
- */
-class SwiftFileBackend extends FileBackendStore {
-	/** @var MultiHttpClient */
-	protected $http;
-
-	/** @var int TTL in seconds */
-	protected $authTTL;
-
-	/** @var string Authentication base URL (without version) */
-	protected $swiftAuthUrl;
-
-	/** @var string Swift user (account:user) to authenticate as */
-	protected $swiftUser;
-
-	/** @var string Secret key for user */
-	protected $swiftKey;
-
-	/** @var string Shared secret value for making temp URLs */
-	protected $swiftTempUrlKey;
-
-	/** @var string S3 access key (RADOS Gateway) */
-	protected $rgwS3AccessKey;
-
-	/** @var string S3 authentication key (RADOS Gateway) */
-	protected $rgwS3SecretKey;
-
-	/** @var BagOStuff */
-	protected $srvCache;
-
-	/** @var ProcessCacheLRU Container stat cache */
-	protected $containerStatCache;
-
-	/** @var array */
-	protected $authCreds;
-
-	/** @var int UNIX timestamp */
-	protected $authSessionTimestamp = 0;
-
-	/** @var int UNIX timestamp */
-	protected $authErrorTimestamp = null;
-
-	/** @var bool Whether the server is an Ceph RGW */
-	protected $isRGW = false;
-
-	/**
-	 * @see FileBackendStore::__construct()
-	 * Additional $config params include:
-	 *   - swiftAuthUrl       : Swift authentication server URL
-	 *   - swiftUser          : Swift user used by MediaWiki (account:username)
-	 *   - swiftKey           : Swift authentication key for the above user
-	 *   - swiftAuthTTL       : Swift authentication TTL (seconds)
-	 *   - swiftTempUrlKey    : Swift "X-Account-Meta-Temp-URL-Key" value on the account.
-	 *                          Do not set this until it has been set in the backend.
-	 *   - shardViaHashLevels : Map of container names to sharding config with:
-	 *                             - base   : base of hash characters, 16 or 36
-	 *                             - levels : the number of hash levels (and digits)
-	 *                             - repeat : hash subdirectories are prefixed with all the
-	 *                                        parent hash directory names (e.g. "a/ab/abc")
-	 *   - cacheAuthInfo      : Whether to cache authentication tokens in APC, XCache, ect.
-	 *                          If those are not available, then the main cache will be used.
-	 *                          This is probably insecure in shared hosting environments.
-	 *   - rgwS3AccessKey     : Rados Gateway S3 "access key" value on the account.
-	 *                          Do not set this until it has been set in the backend.
-	 *                          This is used for generating expiring pre-authenticated URLs.
-	 *                          Only use this when using rgw and to work around
-	 *                          http://tracker.newdream.net/issues/3454.
-	 *   - rgwS3SecretKey     : Rados Gateway S3 "secret key" value on the account.
-	 *                          Do not set this until it has been set in the backend.
-	 *                          This is used for generating expiring pre-authenticated URLs.
-	 *                          Only use this when using rgw and to work around
-	 *                          http://tracker.newdream.net/issues/3454.
-	 */
-	public function __construct( array $config ) {
-		parent::__construct( $config );
-		// Required settings
-		$this->swiftAuthUrl = $config['swiftAuthUrl'];
-		$this->swiftUser = $config['swiftUser'];
-		$this->swiftKey = $config['swiftKey'];
-		// Optional settings
-		$this->authTTL = isset( $config['swiftAuthTTL'] )
-			? $config['swiftAuthTTL']
-			: 15 * 60; // some sane number
-		$this->swiftTempUrlKey = isset( $config['swiftTempUrlKey'] )
-			? $config['swiftTempUrlKey']
-			: '';
-		$this->shardViaHashLevels = isset( $config['shardViaHashLevels'] )
-			? $config['shardViaHashLevels']
-			: '';
-		$this->rgwS3AccessKey = isset( $config['rgwS3AccessKey'] )
-			? $config['rgwS3AccessKey']
-			: '';
-		$this->rgwS3SecretKey = isset( $config['rgwS3SecretKey'] )
-			? $config['rgwS3SecretKey']
-			: '';
-		// HTTP helper client
-		$this->http = new MultiHttpClient( [] );
-		// Cache container information to mask latency
-		if ( isset( $config['wanCache'] ) && $config['wanCache'] instanceof WANObjectCache ) {
-			$this->memCache = $config['wanCache'];
-		}
-		// Process cache for container info
-		$this->containerStatCache = new ProcessCacheLRU( 300 );
-		// Cache auth token information to avoid RTTs
-		if ( !empty( $config['cacheAuthInfo'] ) && isset( $config['srvCache'] ) ) {
-			$this->srvCache = $config['srvCache'];
-		} else {
-			$this->srvCache = new EmptyBagOStuff();
-		}
-	}
-
-	public function getFeatures() {
-		return ( FileBackend::ATTR_UNICODE_PATHS |
-			FileBackend::ATTR_HEADERS | FileBackend::ATTR_METADATA );
-	}
-
-	protected function resolveContainerPath( $container, $relStoragePath ) {
-		if ( !mb_check_encoding( $relStoragePath, 'UTF-8' ) ) {
-			return null; // not UTF-8, makes it hard to use CF and the swift HTTP API
-		} elseif ( strlen( urlencode( $relStoragePath ) ) > 1024 ) {
-			return null; // too long for Swift
-		}
-
-		return $relStoragePath;
-	}
-
-	public function isPathUsableInternal( $storagePath ) {
-		list( $container, $rel ) = $this->resolveStoragePathReal( $storagePath );
-		if ( $rel === null ) {
-			return false; // invalid
-		}
-
-		return is_array( $this->getContainerStat( $container ) );
-	}
-
-	/**
-	 * Sanitize and filter the custom headers from a $params array.
-	 * Only allows certain "standard" Content- and X-Content- headers.
-	 *
-	 * @param array $params
-	 * @return array Sanitized value of 'headers' field in $params
-	 */
-	protected function sanitizeHdrs( array $params ) {
-		return isset( $params['headers'] )
-			? $this->getCustomHeaders( $params['headers'] )
-			: [];
-
-	}
-
-	/**
-	 * @param array $rawHeaders
-	 * @return array Custom non-metadata HTTP headers
-	 */
-	protected function getCustomHeaders( array $rawHeaders ) {
-		$headers = [];
-
-		// Normalize casing, and strip out illegal headers
-		foreach ( $rawHeaders as $name => $value ) {
-			$name = strtolower( $name );
-			if ( preg_match( '/^content-(type|length)$/', $name ) ) {
-				continue; // blacklisted
-			} elseif ( preg_match( '/^(x-)?content-/', $name ) ) {
-				$headers[$name] = $value; // allowed
-			} elseif ( preg_match( '/^content-(disposition)/', $name ) ) {
-				$headers[$name] = $value; // allowed
-			}
-		}
-		// By default, Swift has annoyingly low maximum header value limits
-		if ( isset( $headers['content-disposition'] ) ) {
-			$disposition = '';
-			// @note: assume FileBackend::makeContentDisposition() already used
-			foreach ( explode( ';', $headers['content-disposition'] ) as $part ) {
-				$part = trim( $part );
-				$new = ( $disposition === '' ) ? $part : "{$disposition};{$part}";
-				if ( strlen( $new ) <= 255 ) {
-					$disposition = $new;
-				} else {
-					break; // too long; sigh
-				}
-			}
-			$headers['content-disposition'] = $disposition;
-		}
-
-		return $headers;
-	}
-
-	/**
-	 * @param array $rawHeaders
-	 * @return array Custom metadata headers
-	 */
-	protected function getMetadataHeaders( array $rawHeaders ) {
-		$headers = [];
-		foreach ( $rawHeaders as $name => $value ) {
-			$name = strtolower( $name );
-			if ( strpos( $name, 'x-object-meta-' ) === 0 ) {
-				$headers[$name] = $value;
-			}
-		}
-
-		return $headers;
-	}
-
-	/**
-	 * @param array $rawHeaders
-	 * @return array Custom metadata headers with prefix removed
-	 */
-	protected function getMetadata( array $rawHeaders ) {
-		$metadata = [];
-		foreach ( $this->getMetadataHeaders( $rawHeaders ) as $name => $value ) {
-			$metadata[substr( $name, strlen( 'x-object-meta-' ) )] = $value;
-		}
-
-		return $metadata;
-	}
-
-	protected function doCreateInternal( array $params ) {
-		$status = $this->newStatus();
-
-		list( $dstCont, $dstRel ) = $this->resolveStoragePathReal( $params['dst'] );
-		if ( $dstRel === null ) {
-			$status->fatal( 'backend-fail-invalidpath', $params['dst'] );
-
-			return $status;
-		}
-
-		$sha1Hash = Wikimedia\base_convert( sha1( $params['content'] ), 16, 36, 31 );
-		$contentType = isset( $params['headers']['content-type'] )
-			? $params['headers']['content-type']
-			: $this->getContentType( $params['dst'], $params['content'], null );
-
-		$reqs = [ [
-			'method' => 'PUT',
-			'url' => [ $dstCont, $dstRel ],
-			'headers' => [
-				'content-length' => strlen( $params['content'] ),
-				'etag' => md5( $params['content'] ),
-				'content-type' => $contentType,
-				'x-object-meta-sha1base36' => $sha1Hash
-			] + $this->sanitizeHdrs( $params ),
-			'body' => $params['content']
-		] ];
-
-		$method = __METHOD__;
-		$handler = function ( array $request, StatusValue $status ) use ( $method, $params ) {
-			list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $request['response'];
-			if ( $rcode === 201 ) {
-				// good
-			} elseif ( $rcode === 412 ) {
-				$status->fatal( 'backend-fail-contenttype', $params['dst'] );
-			} else {
-				$this->onError( $status, $method, $params, $rerr, $rcode, $rdesc );
-			}
-		};
-
-		$opHandle = new SwiftFileOpHandle( $this, $handler, $reqs );
-		if ( !empty( $params['async'] ) ) { // deferred
-			$status->value = $opHandle;
-		} else { // actually write the object in Swift
-			$status->merge( current( $this->doExecuteOpHandlesInternal( [ $opHandle ] ) ) );
-		}
-
-		return $status;
-	}
-
-	protected function doStoreInternal( array $params ) {
-		$status = $this->newStatus();
-
-		list( $dstCont, $dstRel ) = $this->resolveStoragePathReal( $params['dst'] );
-		if ( $dstRel === null ) {
-			$status->fatal( 'backend-fail-invalidpath', $params['dst'] );
-
-			return $status;
-		}
-
-		MediaWiki\suppressWarnings();
-		$sha1Hash = sha1_file( $params['src'] );
-		MediaWiki\restoreWarnings();
-		if ( $sha1Hash === false ) { // source doesn't exist?
-			$status->fatal( 'backend-fail-store', $params['src'], $params['dst'] );
-
-			return $status;
-		}
-		$sha1Hash = Wikimedia\base_convert( $sha1Hash, 16, 36, 31 );
-		$contentType = isset( $params['headers']['content-type'] )
-			? $params['headers']['content-type']
-			: $this->getContentType( $params['dst'], null, $params['src'] );
-
-		$handle = fopen( $params['src'], 'rb' );
-		if ( $handle === false ) { // source doesn't exist?
-			$status->fatal( 'backend-fail-store', $params['src'], $params['dst'] );
-
-			return $status;
-		}
-
-		$reqs = [ [
-			'method' => 'PUT',
-			'url' => [ $dstCont, $dstRel ],
-			'headers' => [
-				'content-length' => filesize( $params['src'] ),
-				'etag' => md5_file( $params['src'] ),
-				'content-type' => $contentType,
-				'x-object-meta-sha1base36' => $sha1Hash
-			] + $this->sanitizeHdrs( $params ),
-			'body' => $handle // resource
-		] ];
-
-		$method = __METHOD__;
-		$handler = function ( array $request, StatusValue $status ) use ( $method, $params ) {
-			list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $request['response'];
-			if ( $rcode === 201 ) {
-				// good
-			} elseif ( $rcode === 412 ) {
-				$status->fatal( 'backend-fail-contenttype', $params['dst'] );
-			} else {
-				$this->onError( $status, $method, $params, $rerr, $rcode, $rdesc );
-			}
-		};
-
-		$opHandle = new SwiftFileOpHandle( $this, $handler, $reqs );
-		if ( !empty( $params['async'] ) ) { // deferred
-			$status->value = $opHandle;
-		} else { // actually write the object in Swift
-			$status->merge( current( $this->doExecuteOpHandlesInternal( [ $opHandle ] ) ) );
-		}
-
-		return $status;
-	}
-
-	protected function doCopyInternal( array $params ) {
-		$status = $this->newStatus();
-
-		list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $params['src'] );
-		if ( $srcRel === null ) {
-			$status->fatal( 'backend-fail-invalidpath', $params['src'] );
-
-			return $status;
-		}
-
-		list( $dstCont, $dstRel ) = $this->resolveStoragePathReal( $params['dst'] );
-		if ( $dstRel === null ) {
-			$status->fatal( 'backend-fail-invalidpath', $params['dst'] );
-
-			return $status;
-		}
-
-		$reqs = [ [
-			'method' => 'PUT',
-			'url' => [ $dstCont, $dstRel ],
-			'headers' => [
-				'x-copy-from' => '/' . rawurlencode( $srcCont ) .
-					'/' . str_replace( "%2F", "/", rawurlencode( $srcRel ) )
-			] + $this->sanitizeHdrs( $params ), // extra headers merged into object
-		] ];
-
-		$method = __METHOD__;
-		$handler = function ( array $request, StatusValue $status ) use ( $method, $params ) {
-			list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $request['response'];
-			if ( $rcode === 201 ) {
-				// good
-			} elseif ( $rcode === 404 ) {
-				$status->fatal( 'backend-fail-copy', $params['src'], $params['dst'] );
-			} else {
-				$this->onError( $status, $method, $params, $rerr, $rcode, $rdesc );
-			}
-		};
-
-		$opHandle = new SwiftFileOpHandle( $this, $handler, $reqs );
-		if ( !empty( $params['async'] ) ) { // deferred
-			$status->value = $opHandle;
-		} else { // actually write the object in Swift
-			$status->merge( current( $this->doExecuteOpHandlesInternal( [ $opHandle ] ) ) );
-		}
-
-		return $status;
-	}
-
-	protected function doMoveInternal( array $params ) {
-		$status = $this->newStatus();
-
-		list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $params['src'] );
-		if ( $srcRel === null ) {
-			$status->fatal( 'backend-fail-invalidpath', $params['src'] );
-
-			return $status;
-		}
-
-		list( $dstCont, $dstRel ) = $this->resolveStoragePathReal( $params['dst'] );
-		if ( $dstRel === null ) {
-			$status->fatal( 'backend-fail-invalidpath', $params['dst'] );
-
-			return $status;
-		}
-
-		$reqs = [
-			[
-				'method' => 'PUT',
-				'url' => [ $dstCont, $dstRel ],
-				'headers' => [
-					'x-copy-from' => '/' . rawurlencode( $srcCont ) .
-						'/' . str_replace( "%2F", "/", rawurlencode( $srcRel ) )
-				] + $this->sanitizeHdrs( $params ) // extra headers merged into object
-			]
-		];
-		if ( "{$srcCont}/{$srcRel}" !== "{$dstCont}/{$dstRel}" ) {
-			$reqs[] = [
-				'method' => 'DELETE',
-				'url' => [ $srcCont, $srcRel ],
-				'headers' => []
-			];
-		}
-
-		$method = __METHOD__;
-		$handler = function ( array $request, StatusValue $status ) use ( $method, $params ) {
-			list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $request['response'];
-			if ( $request['method'] === 'PUT' && $rcode === 201 ) {
-				// good
-			} elseif ( $request['method'] === 'DELETE' && $rcode === 204 ) {
-				// good
-			} elseif ( $rcode === 404 ) {
-				$status->fatal( 'backend-fail-move', $params['src'], $params['dst'] );
-			} else {
-				$this->onError( $status, $method, $params, $rerr, $rcode, $rdesc );
-			}
-		};
-
-		$opHandle = new SwiftFileOpHandle( $this, $handler, $reqs );
-		if ( !empty( $params['async'] ) ) { // deferred
-			$status->value = $opHandle;
-		} else { // actually move the object in Swift
-			$status->merge( current( $this->doExecuteOpHandlesInternal( [ $opHandle ] ) ) );
-		}
-
-		return $status;
-	}
-
-	protected function doDeleteInternal( array $params ) {
-		$status = $this->newStatus();
-
-		list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $params['src'] );
-		if ( $srcRel === null ) {
-			$status->fatal( 'backend-fail-invalidpath', $params['src'] );
-
-			return $status;
-		}
-
-		$reqs = [ [
-			'method' => 'DELETE',
-			'url' => [ $srcCont, $srcRel ],
-			'headers' => []
-		] ];
-
-		$method = __METHOD__;
-		$handler = function ( array $request, StatusValue $status ) use ( $method, $params ) {
-			list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $request['response'];
-			if ( $rcode === 204 ) {
-				// good
-			} elseif ( $rcode === 404 ) {
-				if ( empty( $params['ignoreMissingSource'] ) ) {
-					$status->fatal( 'backend-fail-delete', $params['src'] );
-				}
-			} else {
-				$this->onError( $status, $method, $params, $rerr, $rcode, $rdesc );
-			}
-		};
-
-		$opHandle = new SwiftFileOpHandle( $this, $handler, $reqs );
-		if ( !empty( $params['async'] ) ) { // deferred
-			$status->value = $opHandle;
-		} else { // actually delete the object in Swift
-			$status->merge( current( $this->doExecuteOpHandlesInternal( [ $opHandle ] ) ) );
-		}
-
-		return $status;
-	}
-
-	protected function doDescribeInternal( array $params ) {
-		$status = $this->newStatus();
-
-		list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $params['src'] );
-		if ( $srcRel === null ) {
-			$status->fatal( 'backend-fail-invalidpath', $params['src'] );
-
-			return $status;
-		}
-
-		// Fetch the old object headers/metadata...this should be in stat cache by now
-		$stat = $this->getFileStat( [ 'src' => $params['src'], 'latest' => 1 ] );
-		if ( $stat && !isset( $stat['xattr'] ) ) { // older cache entry
-			$stat = $this->doGetFileStat( [ 'src' => $params['src'], 'latest' => 1 ] );
-		}
-		if ( !$stat ) {
-			$status->fatal( 'backend-fail-describe', $params['src'] );
-
-			return $status;
-		}
-
-		// POST clears prior headers, so we need to merge the changes in to the old ones
-		$metaHdrs = [];
-		foreach ( $stat['xattr']['metadata'] as $name => $value ) {
-			$metaHdrs["x-object-meta-$name"] = $value;
-		}
-		$customHdrs = $this->sanitizeHdrs( $params ) + $stat['xattr']['headers'];
-
-		$reqs = [ [
-			'method' => 'POST',
-			'url' => [ $srcCont, $srcRel ],
-			'headers' => $metaHdrs + $customHdrs
-		] ];
-
-		$method = __METHOD__;
-		$handler = function ( array $request, StatusValue $status ) use ( $method, $params ) {
-			list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $request['response'];
-			if ( $rcode === 202 ) {
-				// good
-			} elseif ( $rcode === 404 ) {
-				$status->fatal( 'backend-fail-describe', $params['src'] );
-			} else {
-				$this->onError( $status, $method, $params, $rerr, $rcode, $rdesc );
-			}
-		};
-
-		$opHandle = new SwiftFileOpHandle( $this, $handler, $reqs );
-		if ( !empty( $params['async'] ) ) { // deferred
-			$status->value = $opHandle;
-		} else { // actually change the object in Swift
-			$status->merge( current( $this->doExecuteOpHandlesInternal( [ $opHandle ] ) ) );
-		}
-
-		return $status;
-	}
-
-	protected function doPrepareInternal( $fullCont, $dir, array $params ) {
-		$status = $this->newStatus();
-
-		// (a) Check if container already exists
-		$stat = $this->getContainerStat( $fullCont );
-		if ( is_array( $stat ) ) {
-			return $status; // already there
-		} elseif ( $stat === null ) {
-			$status->fatal( 'backend-fail-internal', $this->name );
-			$this->logger->error( __METHOD__ . ': cannot get container stat' );
-
-			return $status;
-		}
-
-		// (b) Create container as needed with proper ACLs
-		if ( $stat === false ) {
-			$params['op'] = 'prepare';
-			$status->merge( $this->createContainer( $fullCont, $params ) );
-		}
-
-		return $status;
-	}
-
-	protected function doSecureInternal( $fullCont, $dir, array $params ) {
-		$status = $this->newStatus();
-		if ( empty( $params['noAccess'] ) ) {
-			return $status; // nothing to do
-		}
-
-		$stat = $this->getContainerStat( $fullCont );
-		if ( is_array( $stat ) ) {
-			// Make container private to end-users...
-			$status->merge( $this->setContainerAccess(
-				$fullCont,
-				[ $this->swiftUser ], // read
-				[ $this->swiftUser ] // write
-			) );
-		} elseif ( $stat === false ) {
-			$status->fatal( 'backend-fail-usable', $params['dir'] );
-		} else {
-			$status->fatal( 'backend-fail-internal', $this->name );
-			$this->logger->error( __METHOD__ . ': cannot get container stat' );
-		}
-
-		return $status;
-	}
-
-	protected function doPublishInternal( $fullCont, $dir, array $params ) {
-		$status = $this->newStatus();
-
-		$stat = $this->getContainerStat( $fullCont );
-		if ( is_array( $stat ) ) {
-			// Make container public to end-users...
-			$status->merge( $this->setContainerAccess(
-				$fullCont,
-				[ $this->swiftUser, '.r:*' ], // read
-				[ $this->swiftUser ] // write
-			) );
-		} elseif ( $stat === false ) {
-			$status->fatal( 'backend-fail-usable', $params['dir'] );
-		} else {
-			$status->fatal( 'backend-fail-internal', $this->name );
-			$this->logger->error( __METHOD__ . ': cannot get container stat' );
-		}
-
-		return $status;
-	}
-
-	protected function doCleanInternal( $fullCont, $dir, array $params ) {
-		$status = $this->newStatus();
-
-		// Only containers themselves can be removed, all else is virtual
-		if ( $dir != '' ) {
-			return $status; // nothing to do
-		}
-
-		// (a) Check the container
-		$stat = $this->getContainerStat( $fullCont, true );
-		if ( $stat === false ) {
-			return $status; // ok, nothing to do
-		} elseif ( !is_array( $stat ) ) {
-			$status->fatal( 'backend-fail-internal', $this->name );
-			$this->logger->error( __METHOD__ . ': cannot get container stat' );
-
-			return $status;
-		}
-
-		// (b) Delete the container if empty
-		if ( $stat['count'] == 0 ) {
-			$params['op'] = 'clean';
-			$status->merge( $this->deleteContainer( $fullCont, $params ) );
-		}
-
-		return $status;
-	}
-
-	protected function doGetFileStat( array $params ) {
-		$params = [ 'srcs' => [ $params['src'] ], 'concurrency' => 1 ] + $params;
-		unset( $params['src'] );
-		$stats = $this->doGetFileStatMulti( $params );
-
-		return reset( $stats );
-	}
-
-	/**
-	 * Convert dates like "Tue, 03 Jan 2012 22:01:04 GMT"/"2013-05-11T07:37:27.678360Z".
-	 * Dates might also come in like "2013-05-11T07:37:27.678360" from Swift listings,
-	 * missing the timezone suffix (though Ceph RGW does not appear to have this bug).
-	 *
-	 * @param string $ts
-	 * @param int $format Output format (TS_* constant)
-	 * @return string
-	 * @throws FileBackendError
-	 */
-	protected function convertSwiftDate( $ts, $format = TS_MW ) {
-		try {
-			$timestamp = new MWTimestamp( $ts );
-
-			return $timestamp->getTimestamp( $format );
-		} catch ( Exception $e ) {
-			throw new FileBackendError( $e->getMessage() );
-		}
-	}
-
-	/**
-	 * Fill in any missing object metadata and save it to Swift
-	 *
-	 * @param array $objHdrs Object response headers
-	 * @param string $path Storage path to object
-	 * @return array New headers
-	 */
-	protected function addMissingMetadata( array $objHdrs, $path ) {
-		if ( isset( $objHdrs['x-object-meta-sha1base36'] ) ) {
-			return $objHdrs; // nothing to do
-		}
-
-		/** @noinspection PhpUnusedLocalVariableInspection */
-		$ps = $this->scopedProfileSection( __METHOD__ . "-{$this->name}" );
-		$this->logger->error( __METHOD__ . ": $path was not stored with SHA-1 metadata." );
-
-		$objHdrs['x-object-meta-sha1base36'] = false;
-
-		$auth = $this->getAuthentication();
-		if ( !$auth ) {
-			return $objHdrs; // failed
-		}
-
-		// Find prior custom HTTP headers
-		$postHeaders = $this->getCustomHeaders( $objHdrs );
-		// Find prior metadata headers
-		$postHeaders += $this->getMetadataHeaders( $objHdrs );
-
-		$status = $this->newStatus();
-		/** @noinspection PhpUnusedLocalVariableInspection */
-		$scopeLockS = $this->getScopedFileLocks( [ $path ], LockManager::LOCK_UW, $status );
-		if ( $status->isOK() ) {
-			$tmpFile = $this->getLocalCopy( [ 'src' => $path, 'latest' => 1 ] );
-			if ( $tmpFile ) {
-				$hash = $tmpFile->getSha1Base36();
-				if ( $hash !== false ) {
-					$objHdrs['x-object-meta-sha1base36'] = $hash;
-					// Merge new SHA1 header into the old ones
-					$postHeaders['x-object-meta-sha1base36'] = $hash;
-					list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $path );
-					list( $rcode ) = $this->http->run( [
-						'method' => 'POST',
-						'url' => $this->storageUrl( $auth, $srcCont, $srcRel ),
-						'headers' => $this->authTokenHeaders( $auth ) + $postHeaders
-					] );
-					if ( $rcode >= 200 && $rcode <= 299 ) {
-						$this->deleteFileCache( $path );
-
-						return $objHdrs; // success
-					}
-				}
-			}
-		}
-
-		$this->logger->error( __METHOD__ . ": unable to set SHA-1 metadata for $path" );
-
-		return $objHdrs; // failed
-	}
-
-	protected function doGetFileContentsMulti( array $params ) {
-		$contents = [];
-
-		$auth = $this->getAuthentication();
-
-		$ep = array_diff_key( $params, [ 'srcs' => 1 ] ); // for error logging
-		// Blindly create tmp files and stream to them, catching any exception if the file does
-		// not exist. Doing stats here is useless and will loop infinitely in addMissingMetadata().
-		$reqs = []; // (path => op)
-
-		foreach ( $params['srcs'] as $path ) { // each path in this concurrent batch
-			list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $path );
-			if ( $srcRel === null || !$auth ) {
-				$contents[$path] = false;
-				continue;
-			}
-			// Create a new temporary memory file...
-			$handle = fopen( 'php://temp', 'wb' );
-			if ( $handle ) {
-				$reqs[$path] = [
-					'method'  => 'GET',
-					'url'     => $this->storageUrl( $auth, $srcCont, $srcRel ),
-					'headers' => $this->authTokenHeaders( $auth )
-						+ $this->headersFromParams( $params ),
-					'stream'  => $handle,
-				];
-			}
-			$contents[$path] = false;
-		}
-
-		$opts = [ 'maxConnsPerHost' => $params['concurrency'] ];
-		$reqs = $this->http->runMulti( $reqs, $opts );
-		foreach ( $reqs as $path => $op ) {
-			list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $op['response'];
-			if ( $rcode >= 200 && $rcode <= 299 ) {
-				rewind( $op['stream'] ); // start from the beginning
-				$contents[$path] = stream_get_contents( $op['stream'] );
-			} elseif ( $rcode === 404 ) {
-				$contents[$path] = false;
-			} else {
-				$this->onError( null, __METHOD__,
-					[ 'src' => $path ] + $ep, $rerr, $rcode, $rdesc );
-			}
-			fclose( $op['stream'] ); // close open handle
-		}
-
-		return $contents;
-	}
-
-	protected function doDirectoryExists( $fullCont, $dir, array $params ) {
-		$prefix = ( $dir == '' ) ? null : "{$dir}/";
-		$status = $this->objectListing( $fullCont, 'names', 1, null, $prefix );
-		if ( $status->isOK() ) {
-			return ( count( $status->value ) ) > 0;
-		}
-
-		return null; // error
-	}
-
-	/**
-	 * @see FileBackendStore::getDirectoryListInternal()
-	 * @param string $fullCont
-	 * @param string $dir
-	 * @param array $params
-	 * @return SwiftFileBackendDirList
-	 */
-	public function getDirectoryListInternal( $fullCont, $dir, array $params ) {
-		return new SwiftFileBackendDirList( $this, $fullCont, $dir, $params );
-	}
-
-	/**
-	 * @see FileBackendStore::getFileListInternal()
-	 * @param string $fullCont
-	 * @param string $dir
-	 * @param array $params
-	 * @return SwiftFileBackendFileList
-	 */
-	public function getFileListInternal( $fullCont, $dir, array $params ) {
-		return new SwiftFileBackendFileList( $this, $fullCont, $dir, $params );
-	}
-
-	/**
-	 * Do not call this function outside of SwiftFileBackendFileList
-	 *
-	 * @param string $fullCont Resolved container name
-	 * @param string $dir Resolved storage directory with no trailing slash
-	 * @param string|null $after Resolved container relative path to list items after
-	 * @param int $limit Max number of items to list
-	 * @param array $params Parameters for getDirectoryList()
-	 * @return array List of container relative resolved paths of directories directly under $dir
-	 * @throws FileBackendError
-	 */
-	public function getDirListPageInternal( $fullCont, $dir, &$after, $limit, array $params ) {
-		$dirs = [];
-		if ( $after === INF ) {
-			return $dirs; // nothing more
-		}
-
-		$ps = $this->scopedProfileSection( __METHOD__ . "-{$this->name}" );
-
-		$prefix = ( $dir == '' ) ? null : "{$dir}/";
-		// Non-recursive: only list dirs right under $dir
-		if ( !empty( $params['topOnly'] ) ) {
-			$status = $this->objectListing( $fullCont, 'names', $limit, $after, $prefix, '/' );
-			if ( !$status->isOK() ) {
-				throw new FileBackendError( "Iterator page I/O error." );
-			}
-			$objects = $status->value;
-			foreach ( $objects as $object ) { // files and directories
-				if ( substr( $object, -1 ) === '/' ) {
-					$dirs[] = $object; // directories end in '/'
-				}
-			}
-		} else {
-			// Recursive: list all dirs under $dir and its subdirs
-			$getParentDir = function ( $path ) {
-				return ( strpos( $path, '/' ) !== false ) ? dirname( $path ) : false;
-			};
-
-			// Get directory from last item of prior page
-			$lastDir = $getParentDir( $after ); // must be first page
-			$status = $this->objectListing( $fullCont, 'names', $limit, $after, $prefix );
-
-			if ( !$status->isOK() ) {
-				throw new FileBackendError( "Iterator page I/O error." );
-			}
-
-			$objects = $status->value;
-
-			foreach ( $objects as $object ) { // files
-				$objectDir = $getParentDir( $object ); // directory of object
-
-				if ( $objectDir !== false && $objectDir !== $dir ) {
-					// Swift stores paths in UTF-8, using binary sorting.
-					// See function "create_container_table" in common/db.py.
-					// If a directory is not "greater" than the last one,
-					// then it was already listed by the calling iterator.
-					if ( strcmp( $objectDir, $lastDir ) > 0 ) {
-						$pDir = $objectDir;
-						do { // add dir and all its parent dirs
-							$dirs[] = "{$pDir}/";
-							$pDir = $getParentDir( $pDir );
-						} while ( $pDir !== false // sanity
-							&& strcmp( $pDir, $lastDir ) > 0 // not done already
-							&& strlen( $pDir ) > strlen( $dir ) // within $dir
-						);
-					}
-					$lastDir = $objectDir;
-				}
-			}
-		}
-		// Page on the unfiltered directory listing (what is returned may be filtered)
-		if ( count( $objects ) < $limit ) {
-			$after = INF; // avoid a second RTT
-		} else {
-			$after = end( $objects ); // update last item
-		}
-
-		return $dirs;
-	}
-
-	/**
-	 * Do not call this function outside of SwiftFileBackendFileList
-	 *
-	 * @param string $fullCont Resolved container name
-	 * @param string $dir Resolved storage directory with no trailing slash
-	 * @param string|null $after Resolved container relative path of file to list items after
-	 * @param int $limit Max number of items to list
-	 * @param array $params Parameters for getDirectoryList()
-	 * @return array List of resolved container relative paths of files under $dir
-	 * @throws FileBackendError
-	 */
-	public function getFileListPageInternal( $fullCont, $dir, &$after, $limit, array $params ) {
-		$files = []; // list of (path, stat array or null) entries
-		if ( $after === INF ) {
-			return $files; // nothing more
-		}
-
-		$ps = $this->scopedProfileSection( __METHOD__ . "-{$this->name}" );
-
-		$prefix = ( $dir == '' ) ? null : "{$dir}/";
-		// $objects will contain a list of unfiltered names or CF_Object items
-		// Non-recursive: only list files right under $dir
-		if ( !empty( $params['topOnly'] ) ) {
-			if ( !empty( $params['adviseStat'] ) ) {
-				$status = $this->objectListing( $fullCont, 'info', $limit, $after, $prefix, '/' );
-			} else {
-				$status = $this->objectListing( $fullCont, 'names', $limit, $after, $prefix, '/' );
-			}
-		} else {
-			// Recursive: list all files under $dir and its subdirs
-			if ( !empty( $params['adviseStat'] ) ) {
-				$status = $this->objectListing( $fullCont, 'info', $limit, $after, $prefix );
-			} else {
-				$status = $this->objectListing( $fullCont, 'names', $limit, $after, $prefix );
-			}
-		}
-
-		// Reformat this list into a list of (name, stat array or null) entries
-		if ( !$status->isOK() ) {
-			throw new FileBackendError( "Iterator page I/O error." );
-		}
-
-		$objects = $status->value;
-		$files = $this->buildFileObjectListing( $params, $dir, $objects );
-
-		// Page on the unfiltered object listing (what is returned may be filtered)
-		if ( count( $objects ) < $limit ) {
-			$after = INF; // avoid a second RTT
-		} else {
-			$after = end( $objects ); // update last item
-			$after = is_object( $after ) ? $after->name : $after;
-		}
-
-		return $files;
-	}
-
-	/**
-	 * Build a list of file objects, filtering out any directories
-	 * and extracting any stat info if provided in $objects (for CF_Objects)
-	 *
-	 * @param array $params Parameters for getDirectoryList()
-	 * @param string $dir Resolved container directory path
-	 * @param array $objects List of CF_Object items or object names
-	 * @return array List of (names,stat array or null) entries
-	 */
-	private function buildFileObjectListing( array $params, $dir, array $objects ) {
-		$names = [];
-		foreach ( $objects as $object ) {
-			if ( is_object( $object ) ) {
-				if ( isset( $object->subdir ) || !isset( $object->name ) ) {
-					continue; // virtual directory entry; ignore
-				}
-				$stat = [
-					// Convert various random Swift dates to TS_MW
-					'mtime'  => $this->convertSwiftDate( $object->last_modified, TS_MW ),
-					'size'   => (int)$object->bytes,
-					'sha1'   => null,
-					// Note: manifiest ETags are not an MD5 of the file
-					'md5'    => ctype_xdigit( $object->hash ) ? $object->hash : null,
-					'latest' => false // eventually consistent
-				];
-				$names[] = [ $object->name, $stat ];
-			} elseif ( substr( $object, -1 ) !== '/' ) {
-				// Omit directories, which end in '/' in listings
-				$names[] = [ $object, null ];
-			}
-		}
-
-		return $names;
-	}
-
-	/**
-	 * Do not call this function outside of SwiftFileBackendFileList
-	 *
-	 * @param string $path Storage path
-	 * @param array $val Stat value
-	 */
-	public function loadListingStatInternal( $path, array $val ) {
-		$this->cheapCache->set( $path, 'stat', $val );
-	}
-
-	protected function doGetFileXAttributes( array $params ) {
-		$stat = $this->getFileStat( $params );
-		if ( $stat ) {
-			if ( !isset( $stat['xattr'] ) ) {
-				// Stat entries filled by file listings don't include metadata/headers
-				$this->clearCache( [ $params['src'] ] );
-				$stat = $this->getFileStat( $params );
-			}
-
-			return $stat['xattr'];
-		} else {
-			return false;
-		}
-	}
-
-	protected function doGetFileSha1base36( array $params ) {
-		$stat = $this->getFileStat( $params );
-		if ( $stat ) {
-			if ( !isset( $stat['sha1'] ) ) {
-				// Stat entries filled by file listings don't include SHA1
-				$this->clearCache( [ $params['src'] ] );
-				$stat = $this->getFileStat( $params );
-			}
-
-			return $stat['sha1'];
-		} else {
-			return false;
-		}
-	}
-
-	protected function doStreamFile( array $params ) {
-		$status = $this->newStatus();
-
-		$flags = !empty( $params['headless'] ) ? StreamFile::STREAM_HEADLESS : 0;
-
-		list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $params['src'] );
-		if ( $srcRel === null ) {
-			StreamFile::send404Message( $params['src'], $flags );
-			$status->fatal( 'backend-fail-invalidpath', $params['src'] );
-
-			return $status;
-		}
-
-		$auth = $this->getAuthentication();
-		if ( !$auth || !is_array( $this->getContainerStat( $srcCont ) ) ) {
-			StreamFile::send404Message( $params['src'], $flags );
-			$status->fatal( 'backend-fail-stream', $params['src'] );
-
-			return $status;
-		}
-
-		// If "headers" is set, we only want to send them if the file is there.
-		// Do not bother checking if the file exists if headers are not set though.
-		if ( $params['headers'] && !$this->fileExists( $params ) ) {
-			StreamFile::send404Message( $params['src'], $flags );
-			$status->fatal( 'backend-fail-stream', $params['src'] );
-
-			return $status;
-		}
-
-		// Send the requested additional headers
-		foreach ( $params['headers'] as $header ) {
-			header( $header ); // aways send
-		}
-
-		if ( empty( $params['allowOB'] ) ) {
-			// Cancel output buffering and gzipping if set
-			call_user_func( $this->obResetFunc );
-		}
-
-		$handle = fopen( 'php://output', 'wb' );
-		list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $this->http->run( [
-			'method' => 'GET',
-			'url' => $this->storageUrl( $auth, $srcCont, $srcRel ),
-			'headers' => $this->authTokenHeaders( $auth )
-				+ $this->headersFromParams( $params ) + $params['options'],
-			'stream' => $handle,
-			'flags'  => [ 'relayResponseHeaders' => empty( $params['headless'] ) ]
-		] );
-
-		if ( $rcode >= 200 && $rcode <= 299 ) {
-			// good
-		} elseif ( $rcode === 404 ) {
-			$status->fatal( 'backend-fail-stream', $params['src'] );
-			// Per bug 41113, nasty things can happen if bad cache entries get
-			// stuck in cache. It's also possible that this error can come up
-			// with simple race conditions. Clear out the stat cache to be safe.
-			$this->clearCache( [ $params['src'] ] );
-			$this->deleteFileCache( $params['src'] );
-		} else {
-			$this->onError( $status, __METHOD__, $params, $rerr, $rcode, $rdesc );
-		}
-
-		return $status;
-	}
-
-	protected function doGetLocalCopyMulti( array $params ) {
-		/** @var TempFSFile[] $tmpFiles */
-		$tmpFiles = [];
-
-		$auth = $this->getAuthentication();
-
-		$ep = array_diff_key( $params, [ 'srcs' => 1 ] ); // for error logging
-		// Blindly create tmp files and stream to them, catching any exception if the file does
-		// not exist. Doing a stat here is useless causes infinite loops in addMissingMetadata().
-		$reqs = []; // (path => op)
-
-		foreach ( $params['srcs'] as $path ) { // each path in this concurrent batch
-			list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $path );
-			if ( $srcRel === null || !$auth ) {
-				$tmpFiles[$path] = null;
-				continue;
-			}
-			// Get source file extension
-			$ext = FileBackend::extensionFromPath( $path );
-			// Create a new temporary file...
-			$tmpFile = TempFSFile::factory( 'localcopy_', $ext, $this->tmpDirectory );
-			if ( $tmpFile ) {
-				$handle = fopen( $tmpFile->getPath(), 'wb' );
-				if ( $handle ) {
-					$reqs[$path] = [
-						'method'  => 'GET',
-						'url'     => $this->storageUrl( $auth, $srcCont, $srcRel ),
-						'headers' => $this->authTokenHeaders( $auth )
-							+ $this->headersFromParams( $params ),
-						'stream'  => $handle,
-					];
-				} else {
-					$tmpFile = null;
-				}
-			}
-			$tmpFiles[$path] = $tmpFile;
-		}
-
-		$isLatest = ( $this->isRGW || !empty( $params['latest'] ) );
-		$opts = [ 'maxConnsPerHost' => $params['concurrency'] ];
-		$reqs = $this->http->runMulti( $reqs, $opts );
-		foreach ( $reqs as $path => $op ) {
-			list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $op['response'];
-			fclose( $op['stream'] ); // close open handle
-			if ( $rcode >= 200 && $rcode <= 299 ) {
-				$size = $tmpFiles[$path] ? $tmpFiles[$path]->getSize() : 0;
-				// Double check that the disk is not full/broken
-				if ( $size != $rhdrs['content-length'] ) {
-					$tmpFiles[$path] = null;
-					$rerr = "Got {$size}/{$rhdrs['content-length']} bytes";
-					$this->onError( null, __METHOD__,
-						[ 'src' => $path ] + $ep, $rerr, $rcode, $rdesc );
-				}
-				// Set the file stat process cache in passing
-				$stat = $this->getStatFromHeaders( $rhdrs );
-				$stat['latest'] = $isLatest;
-				$this->cheapCache->set( $path, 'stat', $stat );
-			} elseif ( $rcode === 404 ) {
-				$tmpFiles[$path] = false;
-			} else {
-				$tmpFiles[$path] = null;
-				$this->onError( null, __METHOD__,
-					[ 'src' => $path ] + $ep, $rerr, $rcode, $rdesc );
-			}
-		}
-
-		return $tmpFiles;
-	}
-
-	public function getFileHttpUrl( array $params ) {
-		if ( $this->swiftTempUrlKey != '' ||
-			( $this->rgwS3AccessKey != '' && $this->rgwS3SecretKey != '' )
-		) {
-			list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $params['src'] );
-			if ( $srcRel === null ) {
-				return null; // invalid path
-			}
-
-			$auth = $this->getAuthentication();
-			if ( !$auth ) {
-				return null;
-			}
-
-			$ttl = isset( $params['ttl'] ) ? $params['ttl'] : 86400;
-			$expires = time() + $ttl;
-
-			if ( $this->swiftTempUrlKey != '' ) {
-				$url = $this->storageUrl( $auth, $srcCont, $srcRel );
-				// Swift wants the signature based on the unencoded object name
-				$contPath = parse_url( $this->storageUrl( $auth, $srcCont ), PHP_URL_PATH );
-				$signature = hash_hmac( 'sha1',
-					"GET\n{$expires}\n{$contPath}/{$srcRel}",
-					$this->swiftTempUrlKey
-				);
-
-				return "{$url}?temp_url_sig={$signature}&temp_url_expires={$expires}";
-			} else { // give S3 API URL for rgw
-				// Path for signature starts with the bucket
-				$spath = '/' . rawurlencode( $srcCont ) . '/' .
-					str_replace( '%2F', '/', rawurlencode( $srcRel ) );
-				// Calculate the hash
-				$signature = base64_encode( hash_hmac(
-					'sha1',
-					"GET\n\n\n{$expires}\n{$spath}",
-					$this->rgwS3SecretKey,
-					true // raw
-				) );
-				// See http://s3.amazonaws.com/doc/s3-developer-guide/RESTAuthentication.html.
-				// Note: adding a newline for empty CanonicalizedAmzHeaders does not work.
-				// Note: S3 API is the rgw default; remove the /swift/ URL bit.
-				return str_replace( '/swift/v1', '', $this->storageUrl( $auth ) . $spath ) .
-					'?' .
-					http_build_query( [
-						'Signature' => $signature,
-						'Expires' => $expires,
-						'AWSAccessKeyId' => $this->rgwS3AccessKey
-					] );
-			}
-		}
-
-		return null;
-	}
-
-	protected function directoriesAreVirtual() {
-		return true;
-	}
-
-	/**
-	 * Get headers to send to Swift when reading a file based
-	 * on a FileBackend params array, e.g. that of getLocalCopy().
-	 * $params is currently only checked for a 'latest' flag.
-	 *
-	 * @param array $params
-	 * @return array
-	 */
-	protected function headersFromParams( array $params ) {
-		$hdrs = [];
-		if ( !empty( $params['latest'] ) ) {
-			$hdrs['x-newest'] = 'true';
-		}
-
-		return $hdrs;
-	}
-
-	/**
-	 * @param FileBackendStoreOpHandle[] $fileOpHandles
-	 *
-	 * @return StatusValue[]
-	 */
-	protected function doExecuteOpHandlesInternal( array $fileOpHandles ) {
-		/** @var $statuses StatusValue[] */
-		$statuses = [];
-
-		$auth = $this->getAuthentication();
-		if ( !$auth ) {
-			foreach ( $fileOpHandles as $index => $fileOpHandle ) {
-				$statuses[$index] = $this->newStatus( 'backend-fail-connect', $this->name );
-			}
-
-			return $statuses;
-		}
-
-		// Split the HTTP requests into stages that can be done concurrently
-		$httpReqsByStage = []; // map of (stage => index => HTTP request)
-		foreach ( $fileOpHandles as $index => $fileOpHandle ) {
-			/** @var SwiftFileOpHandle $fileOpHandle */
-			$reqs = $fileOpHandle->httpOp;
-			// Convert the 'url' parameter to an actual URL using $auth
-			foreach ( $reqs as $stage => &$req ) {
-				list( $container, $relPath ) = $req['url'];
-				$req['url'] = $this->storageUrl( $auth, $container, $relPath );
-				$req['headers'] = isset( $req['headers'] ) ? $req['headers'] : [];
-				$req['headers'] = $this->authTokenHeaders( $auth ) + $req['headers'];
-				$httpReqsByStage[$stage][$index] = $req;
-			}
-			$statuses[$index] = $this->newStatus();
-		}
-
-		// Run all requests for the first stage, then the next, and so on
-		$reqCount = count( $httpReqsByStage );
-		for ( $stage = 0; $stage < $reqCount; ++$stage ) {
-			$httpReqs = $this->http->runMulti( $httpReqsByStage[$stage] );
-			foreach ( $httpReqs as $index => $httpReq ) {
-				// Run the callback for each request of this operation
-				$callback = $fileOpHandles[$index]->callback;
-				call_user_func_array( $callback, [ $httpReq, $statuses[$index] ] );
-				// On failure, abort all remaining requests for this operation
-				// (e.g. abort the DELETE request if the COPY request fails for a move)
-				if ( !$statuses[$index]->isOK() ) {
-					$stages = count( $fileOpHandles[$index]->httpOp );
-					for ( $s = ( $stage + 1 ); $s < $stages; ++$s ) {
-						unset( $httpReqsByStage[$s][$index] );
-					}
-				}
-			}
-		}
-
-		return $statuses;
-	}
-
-	/**
-	 * Set read/write permissions for a Swift container.
-	 *
-	 * @see http://swift.openstack.org/misc.html#acls
-	 *
-	 * In general, we don't allow listings to end-users. It's not useful, isn't well-defined
-	 * (lists are truncated to 10000 item with no way to page), and is just a performance risk.
-	 *
-	 * @param string $container Resolved Swift container
-	 * @param array $readGrps List of the possible criteria for a request to have
-	 * access to read a container. Each item is one of the following formats:
-	 *   - account:user        : Grants access if the request is by the given user
-	 *   - ".r:<regex>"        : Grants access if the request is from a referrer host that
-	 *                           matches the expression and the request is not for a listing.
-	 *                           Setting this to '*' effectively makes a container public.
-	 *   -".rlistings:<regex>" : Grants access if the request is from a referrer host that
-	 *                           matches the expression and the request is for a listing.
-	 * @param array $writeGrps A list of the possible criteria for a request to have
-	 * access to write to a container. Each item is of the following format:
-	 *   - account:user       : Grants access if the request is by the given user
-	 * @return StatusValue
-	 */
-	protected function setContainerAccess( $container, array $readGrps, array $writeGrps ) {
-		$status = $this->newStatus();
-		$auth = $this->getAuthentication();
-
-		if ( !$auth ) {
-			$status->fatal( 'backend-fail-connect', $this->name );
-
-			return $status;
-		}
-
-		list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $this->http->run( [
-			'method' => 'POST',
-			'url' => $this->storageUrl( $auth, $container ),
-			'headers' => $this->authTokenHeaders( $auth ) + [
-				'x-container-read' => implode( ',', $readGrps ),
-				'x-container-write' => implode( ',', $writeGrps )
-			]
-		] );
-
-		if ( $rcode != 204 && $rcode !== 202 ) {
-			$status->fatal( 'backend-fail-internal', $this->name );
-			$this->logger->error( __METHOD__ . ': unexpected rcode value (' . $rcode . ')' );
-		}
-
-		return $status;
-	}
-
-	/**
-	 * Get a Swift container stat array, possibly from process cache.
-	 * Use $reCache if the file count or byte count is needed.
-	 *
-	 * @param string $container Container name
-	 * @param bool $bypassCache Bypass all caches and load from Swift
-	 * @return array|bool|null False on 404, null on failure
-	 */
-	protected function getContainerStat( $container, $bypassCache = false ) {
-		$ps = $this->scopedProfileSection( __METHOD__ . "-{$this->name}" );
-
-		if ( $bypassCache ) { // purge cache
-			$this->containerStatCache->clear( $container );
-		} elseif ( !$this->containerStatCache->has( $container, 'stat' ) ) {
-			$this->primeContainerCache( [ $container ] ); // check persistent cache
-		}
-		if ( !$this->containerStatCache->has( $container, 'stat' ) ) {
-			$auth = $this->getAuthentication();
-			if ( !$auth ) {
-				return null;
-			}
-
-			list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $this->http->run( [
-				'method' => 'HEAD',
-				'url' => $this->storageUrl( $auth, $container ),
-				'headers' => $this->authTokenHeaders( $auth )
-			] );
-
-			if ( $rcode === 204 ) {
-				$stat = [
-					'count' => $rhdrs['x-container-object-count'],
-					'bytes' => $rhdrs['x-container-bytes-used']
-				];
-				if ( $bypassCache ) {
-					return $stat;
-				} else {
-					$this->containerStatCache->set( $container, 'stat', $stat ); // cache it
-					$this->setContainerCache( $container, $stat ); // update persistent cache
-				}
-			} elseif ( $rcode === 404 ) {
-				return false;
-			} else {
-				$this->onError( null, __METHOD__,
-					[ 'cont' => $container ], $rerr, $rcode, $rdesc );
-
-				return null;
-			}
-		}
-
-		return $this->containerStatCache->get( $container, 'stat' );
-	}
-
-	/**
-	 * Create a Swift container
-	 *
-	 * @param string $container Container name
-	 * @param array $params
-	 * @return StatusValue
-	 */
-	protected function createContainer( $container, array $params ) {
-		$status = $this->newStatus();
-
-		$auth = $this->getAuthentication();
-		if ( !$auth ) {
-			$status->fatal( 'backend-fail-connect', $this->name );
-
-			return $status;
-		}
-
-		// @see SwiftFileBackend::setContainerAccess()
-		if ( empty( $params['noAccess'] ) ) {
-			$readGrps = [ '.r:*', $this->swiftUser ]; // public
-		} else {
-			$readGrps = [ $this->swiftUser ]; // private
-		}
-		$writeGrps = [ $this->swiftUser ]; // sanity
-
-		list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $this->http->run( [
-			'method' => 'PUT',
-			'url' => $this->storageUrl( $auth, $container ),
-			'headers' => $this->authTokenHeaders( $auth ) + [
-				'x-container-read' => implode( ',', $readGrps ),
-				'x-container-write' => implode( ',', $writeGrps )
-			]
-		] );
-
-		if ( $rcode === 201 ) { // new
-			// good
-		} elseif ( $rcode === 202 ) { // already there
-			// this shouldn't really happen, but is OK
-		} else {
-			$this->onError( $status, __METHOD__, $params, $rerr, $rcode, $rdesc );
-		}
-
-		return $status;
-	}
-
-	/**
-	 * Delete a Swift container
-	 *
-	 * @param string $container Container name
-	 * @param array $params
-	 * @return StatusValue
-	 */
-	protected function deleteContainer( $container, array $params ) {
-		$status = $this->newStatus();
-
-		$auth = $this->getAuthentication();
-		if ( !$auth ) {
-			$status->fatal( 'backend-fail-connect', $this->name );
-
-			return $status;
-		}
-
-		list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $this->http->run( [
-			'method' => 'DELETE',
-			'url' => $this->storageUrl( $auth, $container ),
-			'headers' => $this->authTokenHeaders( $auth )
-		] );
-
-		if ( $rcode >= 200 && $rcode <= 299 ) { // deleted
-			$this->containerStatCache->clear( $container ); // purge
-		} elseif ( $rcode === 404 ) { // not there
-			// this shouldn't really happen, but is OK
-		} elseif ( $rcode === 409 ) { // not empty
-			$this->onError( $status, __METHOD__, $params, $rerr, $rcode, $rdesc ); // race?
-		} else {
-			$this->onError( $status, __METHOD__, $params, $rerr, $rcode, $rdesc );
-		}
-
-		return $status;
-	}
-
-	/**
-	 * Get a list of objects under a container.
-	 * Either just the names or a list of stdClass objects with details can be returned.
-	 *
-	 * @param string $fullCont
-	 * @param string $type ('info' for a list of object detail maps, 'names' for names only)
-	 * @param int $limit
-	 * @param string|null $after
-	 * @param string|null $prefix
-	 * @param string|null $delim
-	 * @return StatusValue With the list as value
-	 */
-	private function objectListing(
-		$fullCont, $type, $limit, $after = null, $prefix = null, $delim = null
-	) {
-		$status = $this->newStatus();
-
-		$auth = $this->getAuthentication();
-		if ( !$auth ) {
-			$status->fatal( 'backend-fail-connect', $this->name );
-
-			return $status;
-		}
-
-		$query = [ 'limit' => $limit ];
-		if ( $type === 'info' ) {
-			$query['format'] = 'json';
-		}
-		if ( $after !== null ) {
-			$query['marker'] = $after;
-		}
-		if ( $prefix !== null ) {
-			$query['prefix'] = $prefix;
-		}
-		if ( $delim !== null ) {
-			$query['delimiter'] = $delim;
-		}
-
-		list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $this->http->run( [
-			'method' => 'GET',
-			'url' => $this->storageUrl( $auth, $fullCont ),
-			'query' => $query,
-			'headers' => $this->authTokenHeaders( $auth )
-		] );
-
-		$params = [ 'cont' => $fullCont, 'prefix' => $prefix, 'delim' => $delim ];
-		if ( $rcode === 200 ) { // good
-			if ( $type === 'info' ) {
-				$status->value = FormatJson::decode( trim( $rbody ) );
-			} else {
-				$status->value = explode( "\n", trim( $rbody ) );
-			}
-		} elseif ( $rcode === 204 ) {
-			$status->value = []; // empty container
-		} elseif ( $rcode === 404 ) {
-			$status->value = []; // no container
-		} else {
-			$this->onError( $status, __METHOD__, $params, $rerr, $rcode, $rdesc );
-		}
-
-		return $status;
-	}
-
-	protected function doPrimeContainerCache( array $containerInfo ) {
-		foreach ( $containerInfo as $container => $info ) {
-			$this->containerStatCache->set( $container, 'stat', $info );
-		}
-	}
-
-	protected function doGetFileStatMulti( array $params ) {
-		$stats = [];
-
-		$auth = $this->getAuthentication();
-
-		$reqs = [];
-		foreach ( $params['srcs'] as $path ) {
-			list( $srcCont, $srcRel ) = $this->resolveStoragePathReal( $path );
-			if ( $srcRel === null ) {
-				$stats[$path] = false;
-				continue; // invalid storage path
-			} elseif ( !$auth ) {
-				$stats[$path] = null;
-				continue;
-			}
-
-			// (a) Check the container
-			$cstat = $this->getContainerStat( $srcCont );
-			if ( $cstat === false ) {
-				$stats[$path] = false;
-				continue; // ok, nothing to do
-			} elseif ( !is_array( $cstat ) ) {
-				$stats[$path] = null;
-				continue;
-			}
-
-			$reqs[$path] = [
-				'method'  => 'HEAD',
-				'url'     => $this->storageUrl( $auth, $srcCont, $srcRel ),
-				'headers' => $this->authTokenHeaders( $auth ) + $this->headersFromParams( $params )
-			];
-		}
-
-		$opts = [ 'maxConnsPerHost' => $params['concurrency'] ];
-		$reqs = $this->http->runMulti( $reqs, $opts );
-
-		foreach ( $params['srcs'] as $path ) {
-			if ( array_key_exists( $path, $stats ) ) {
-				continue; // some sort of failure above
-			}
-			// (b) Check the file
-			list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $reqs[$path]['response'];
-			if ( $rcode === 200 || $rcode === 204 ) {
-				// Update the object if it is missing some headers
-				$rhdrs = $this->addMissingMetadata( $rhdrs, $path );
-				// Load the stat array from the headers
-				$stat = $this->getStatFromHeaders( $rhdrs );
-				if ( $this->isRGW ) {
-					$stat['latest'] = true; // strong consistency
-				}
-			} elseif ( $rcode === 404 ) {
-				$stat = false;
-			} else {
-				$stat = null;
-				$this->onError( null, __METHOD__, $params, $rerr, $rcode, $rdesc );
-			}
-			$stats[$path] = $stat;
-		}
-
-		return $stats;
-	}
-
-	/**
-	 * @param array $rhdrs
-	 * @return array
-	 */
-	protected function getStatFromHeaders( array $rhdrs ) {
-		// Fetch all of the custom metadata headers
-		$metadata = $this->getMetadata( $rhdrs );
-		// Fetch all of the custom raw HTTP headers
-		$headers = $this->sanitizeHdrs( [ 'headers' => $rhdrs ] );
-
-		return [
-			// Convert various random Swift dates to TS_MW
-			'mtime' => $this->convertSwiftDate( $rhdrs['last-modified'], TS_MW ),
-			// Empty objects actually return no content-length header in Ceph
-			'size'  => isset( $rhdrs['content-length'] ) ? (int)$rhdrs['content-length'] : 0,
-			'sha1'  => isset( $metadata['sha1base36'] ) ? $metadata['sha1base36'] : null,
-			// Note: manifiest ETags are not an MD5 of the file
-			'md5'   => ctype_xdigit( $rhdrs['etag'] ) ? $rhdrs['etag'] : null,
-			'xattr' => [ 'metadata' => $metadata, 'headers' => $headers ]
-		];
-	}
-
-	/**
-	 * @return array|null Credential map
-	 */
-	protected function getAuthentication() {
-		if ( $this->authErrorTimestamp !== null ) {
-			if ( ( time() - $this->authErrorTimestamp ) < 60 ) {
-				return null; // failed last attempt; don't bother
-			} else { // actually retry this time
-				$this->authErrorTimestamp = null;
-			}
-		}
-		// Session keys expire after a while, so we renew them periodically
-		$reAuth = ( ( time() - $this->authSessionTimestamp ) > $this->authTTL );
-		// Authenticate with proxy and get a session key...
-		if ( !$this->authCreds || $reAuth ) {
-			$this->authSessionTimestamp = 0;
-			$cacheKey = $this->getCredsCacheKey( $this->swiftUser );
-			$creds = $this->srvCache->get( $cacheKey ); // credentials
-			// Try to use the credential cache
-			if ( isset( $creds['auth_token'] ) && isset( $creds['storage_url'] ) ) {
-				$this->authCreds = $creds;
-				// Skew the timestamp for worst case to avoid using stale credentials
-				$this->authSessionTimestamp = time() - ceil( $this->authTTL / 2 );
-			} else { // cache miss
-				list( $rcode, $rdesc, $rhdrs, $rbody, $rerr ) = $this->http->run( [
-					'method' => 'GET',
-					'url' => "{$this->swiftAuthUrl}/v1.0",
-					'headers' => [
-						'x-auth-user' => $this->swiftUser,
-						'x-auth-key' => $this->swiftKey
-					]
-				] );
-
-				if ( $rcode >= 200 && $rcode <= 299 ) { // OK
-					$this->authCreds = [
-						'auth_token' => $rhdrs['x-auth-token'],
-						'storage_url' => $rhdrs['x-storage-url']
-					];
-					$this->srvCache->set( $cacheKey, $this->authCreds, ceil( $this->authTTL / 2 ) );
-					$this->authSessionTimestamp = time();
-				} elseif ( $rcode === 401 ) {
-					$this->onError( null, __METHOD__, [], "Authentication failed.", $rcode );
-					$this->authErrorTimestamp = time();
-
-					return null;
-				} else {
-					$this->onError( null, __METHOD__, [], "HTTP return code: $rcode", $rcode );
-					$this->authErrorTimestamp = time();
-
-					return null;
-				}
-			}
-			// Ceph RGW does not use <account> in URLs (OpenStack Swift uses "/v1/<account>")
-			if ( substr( $this->authCreds['storage_url'], -3 ) === '/v1' ) {
-				$this->isRGW = true; // take advantage of strong consistency in Ceph
-			}
-		}
-
-		return $this->authCreds;
-	}
-
-	/**
-	 * @param array $creds From getAuthentication()
-	 * @param string $container
-	 * @param string $object
-	 * @return array
-	 */
-	protected function storageUrl( array $creds, $container = null, $object = null ) {
-		$parts = [ $creds['storage_url'] ];
-		if ( strlen( $container ) ) {
-			$parts[] = rawurlencode( $container );
-		}
-		if ( strlen( $object ) ) {
-			$parts[] = str_replace( "%2F", "/", rawurlencode( $object ) );
-		}
-
-		return implode( '/', $parts );
-	}
-
-	/**
-	 * @param array $creds From getAuthentication()
-	 * @return array
-	 */
-	protected function authTokenHeaders( array $creds ) {
-		return [ 'x-auth-token' => $creds['auth_token'] ];
-	}
-
-	/**
-	 * Get the cache key for a container
-	 *
-	 * @param string $username
-	 * @return string
-	 */
-	private function getCredsCacheKey( $username ) {
-		return 'swiftcredentials:' . md5( $username . ':' . $this->swiftAuthUrl );
-	}
-
-	/**
-	 * Log an unexpected exception for this backend.
-	 * This also sets the StatusValue object to have a fatal error.
-	 *
-	 * @param StatusValue|null $status
-	 * @param string $func
-	 * @param array $params
-	 * @param string $err Error string
-	 * @param int $code HTTP status
-	 * @param string $desc HTTP StatusValue description
-	 */
-	public function onError( $status, $func, array $params, $err = '', $code = 0, $desc = '' ) {
-		if ( $status instanceof StatusValue ) {
-			$status->fatal( 'backend-fail-internal', $this->name );
-		}
-		if ( $code == 401 ) { // possibly a stale token
-			$this->srvCache->delete( $this->getCredsCacheKey( $this->swiftUser ) );
-		}
-		$this->logger->error(
-			"HTTP $code ($desc) in '{$func}' (given '" . FormatJson::encode( $params ) . "')" .
-			( $err ? ": $err" : "" )
-		);
-	}
-}
-
-/**
- * @see FileBackendStoreOpHandle
- */
-class SwiftFileOpHandle extends FileBackendStoreOpHandle {
-	/** @var array List of Requests for MultiHttpClient */
-	public $httpOp;
-	/** @var Closure */
-	public $callback;
-
-	/**
-	 * @param SwiftFileBackend $backend
-	 * @param Closure $callback Function that takes (HTTP request array, status)
-	 * @param array $httpOp MultiHttpClient op
-	 */
-	public function __construct( SwiftFileBackend $backend, Closure $callback, array $httpOp ) {
-		$this->backend = $backend;
-		$this->callback = $callback;
-		$this->httpOp = $httpOp;
-	}
-}
-
-/**
- * SwiftFileBackend helper class to page through listings.
- * Swift also has a listing limit of 10,000 objects for sanity.
- * Do not use this class from places outside SwiftFileBackend.
- *
- * @ingroup FileBackend
- */
-abstract class SwiftFileBackendList implements Iterator {
-	/** @var array List of path or (path,stat array) entries */
-	protected $bufferIter = [];
-
-	/** @var string List items *after* this path */
-	protected $bufferAfter = null;
-
-	/** @var int */
-	protected $pos = 0;
-
-	/** @var array */
-	protected $params = [];
-
-	/** @var SwiftFileBackend */
-	protected $backend;
-
-	/** @var string Container name */
-	protected $container;
-
-	/** @var string Storage directory */
-	protected $dir;
-
-	/** @var int */
-	protected $suffixStart;
-
-	const PAGE_SIZE = 9000; // file listing buffer size
-
-	/**
-	 * @param SwiftFileBackend $backend
-	 * @param string $fullCont Resolved container name
-	 * @param string $dir Resolved directory relative to container
-	 * @param array $params
-	 */
-	public function __construct( SwiftFileBackend $backend, $fullCont, $dir, array $params ) {
-		$this->backend = $backend;
-		$this->container = $fullCont;
-		$this->dir = $dir;
-		if ( substr( $this->dir, -1 ) === '/' ) {
-			$this->dir = substr( $this->dir, 0, -1 ); // remove trailing slash
-		}
-		if ( $this->dir == '' ) { // whole container
-			$this->suffixStart = 0;
-		} else { // dir within container
-			$this->suffixStart = strlen( $this->dir ) + 1; // size of "path/to/dir/"
-		}
-		$this->params = $params;
-	}
-
-	/**
-	 * @see Iterator::key()
-	 * @return int
-	 */
-	public function key() {
-		return $this->pos;
-	}
-
-	/**
-	 * @see Iterator::next()
-	 */
-	public function next() {
-		// Advance to the next file in the page
-		next( $this->bufferIter );
-		++$this->pos;
-		// Check if there are no files left in this page and
-		// advance to the next page if this page was not empty.
-		if ( !$this->valid() && count( $this->bufferIter ) ) {
-			$this->bufferIter = $this->pageFromList(
-				$this->container, $this->dir, $this->bufferAfter, self::PAGE_SIZE, $this->params
-			); // updates $this->bufferAfter
-		}
-	}
-
-	/**
-	 * @see Iterator::rewind()
-	 */
-	public function rewind() {
-		$this->pos = 0;
-		$this->bufferAfter = null;
-		$this->bufferIter = $this->pageFromList(
-			$this->container, $this->dir, $this->bufferAfter, self::PAGE_SIZE, $this->params
-		); // updates $this->bufferAfter
-	}
-
-	/**
-	 * @see Iterator::valid()
-	 * @return bool
-	 */
-	public function valid() {
-		if ( $this->bufferIter === null ) {
-			return false; // some failure?
-		} else {
-			return ( current( $this->bufferIter ) !== false ); // no paths can have this value
-		}
-	}
-
-	/**
-	 * Get the given list portion (page)
-	 *
-	 * @param string $container Resolved container name
-	 * @param string $dir Resolved path relative to container
-	 * @param string $after
-	 * @param int $limit
-	 * @param array $params
-	 * @return Traversable|array
-	 */
-	abstract protected function pageFromList( $container, $dir, &$after, $limit, array $params );
-}
-
-/**
- * Iterator for listing directories
- */
-class SwiftFileBackendDirList extends SwiftFileBackendList {
-	/**
-	 * @see Iterator::current()
-	 * @return string|bool String (relative path) or false
-	 */
-	public function current() {
-		return substr( current( $this->bufferIter ), $this->suffixStart, -1 );
-	}
-
-	protected function pageFromList( $container, $dir, &$after, $limit, array $params ) {
-		return $this->backend->getDirListPageInternal( $container, $dir, $after, $limit, $params );
-	}
-}
-
-/**
- * Iterator for listing regular files
- */
-class SwiftFileBackendFileList extends SwiftFileBackendList {
-	/**
-	 * @see Iterator::current()
-	 * @return string|bool String (relative path) or false
-	 */
-	public function current() {
-		list( $path, $stat ) = current( $this->bufferIter );
-		$relPath = substr( $path, $this->suffixStart );
-		if ( is_array( $stat ) ) {
-			$storageDir = rtrim( $this->params['dir'], '/' );
-			$this->backend->loadListingStatInternal( "$storageDir/$relPath", $stat );
-		}
-
-		return $relPath;
-	}
-
-	protected function pageFromList( $container, $dir, &$after, $limit, array $params ) {
-		return $this->backend->getFileListPageInternal( $container, $dir, $after, $limit, $params );
-	}
-}