compare cached filesize on download

apps/dav/lib/Connector/Sabre/File.php

@@ -45,11 +45,11 @@
 use OC\Files\View;
 use OC\Metadata\FileMetadata;
 use OCA\DAV\AppInfo\Application;
+use OCA\DAV\Connector\Sabre\Exception\BadGateway;
 use OCA\DAV\Connector\Sabre\Exception\EntityTooLarge;
 use OCA\DAV\Connector\Sabre\Exception\FileLocked;
 use OCA\DAV\Connector\Sabre\Exception\Forbidden as DAVForbiddenException;
 use OCA\DAV\Connector\Sabre\Exception\UnsupportedMediaType;
-use OCA\DAV\Connector\Sabre\Exception\BadGateway;
 use OCP\Encryption\Exceptions\GenericEncryptionException;
 use OCP\Files\EntityTooLargeException;
 use OCP\Files\FileInfo;
@@ -491,9 +491,21 @@ public function get() {
 			} catch (\Exception $e) {
 				$this->convertToSabreException($e);
 			}
+
 			if ($res === false) {
 				throw new ServiceUnavailable($this->l10n->t('Could not open file'));
 			}
+
+			// comparing current file size with the one in DB
+			// if different, fix DB and refresh cache.
+			if ($this->getSize() !== $this->fileView->filesize($this->getPath())) {
+				$logger = \OC::$server->get(LoggerInterface::class);
+				$logger->warning('fixing cached size of file id=' . $this->getId());
+
+				$this->getFileInfo()->getStorage()->getUpdater()->update($this->getFileInfo()->getInternalPath());
+				$this->refreshInfo();
+			}
+
 			return $res;
 		} catch (GenericEncryptionException $e) {
 			// returning 503 will allow retry of the operation at a later point in time

lib/private/Files/ObjectStore/ObjectStoreStorage.php

@@ -309,13 +309,23 @@ public function fopen($path, $mode) {
 			case 'rb':
 				$stat = $this->stat($path);
 				if (is_array($stat)) {
+					$filesize = $stat['size'] ?? 0;
 					// Reading 0 sized files is a waste of time
-					if (isset($stat['size']) && $stat['size'] === 0) {
+					if ($filesize === 0) {
 						return fopen('php://memory', $mode);
 					}
 
 					try {
-						return $this->objectStore->readObject($this->getURN($stat['fileid']));
+						$handle = $this->objectStore->readObject($this->getURN($stat['fileid']));
+						if ($handle === false) {
+							return false; // keep backward compatibility
+						}
+						$streamStat = fstat($handle);
+						$actualSize = $streamStat['size'] ?? -1;
+						if ($actualSize > -1 && $actualSize !== $filesize) {
+							$this->getCache()->update((int)$stat['fileid'], ['size' => $actualSize]);
+						}
+						return $handle;
 					} catch (NotFoundException $e) {
 						$this->logger->logException($e, [
 							'app' => 'objectstore',

lib/private/Files/ObjectStore/S3ObjectTrait.php

@@ -29,9 +29,9 @@
 use Aws\S3\Exception\S3MultipartUploadException;
 use Aws\S3\MultipartUploader;
 use Aws\S3\S3Client;
+use GuzzleHttp\Psr7;
 use GuzzleHttp\Psr7\Utils;
 use OC\Files\Stream\SeekableHttpStream;
-use GuzzleHttp\Psr7;
 use Psr\Http\Message\StreamInterface;
 
 trait S3ObjectTrait {
@@ -47,6 +47,7 @@ abstract protected function getCertificateBundlePath(): ?string;
 
 	/**
 	 * @param string $urn the unified resource name used to identify the object
+	 *
 	 * @return resource stream with the read data
 	 * @throws \Exception when something goes wrong, message will be logged
 	 * @since 7.0.0
@@ -88,6 +89,7 @@ public function readObject($urn) {
 		});
 	}
 
+
 	/**
 	 * Single object put helper
 	 *

lib/private/Files/Stream/SeekableHttpStream.php

@@ -75,8 +75,12 @@ public static function open(callable $callback) {
 
 	/** @var ?resource|closed-resource */
 	private $current;
+	/** @var int $offset offset of the current chunk */
 	private int $offset = 0;
+	/** @var int $length length of the current chunk */
 	private int $length = 0;
+	/** @var int $totalSize size of the full stream */
+	private int $totalSize = 0;
 	private bool $needReconnect = false;
 
 	private function reconnect(int $start): bool {
@@ -128,6 +132,9 @@ private function reconnect(int $start): bool {
 
 		$this->offset = $begin;
 		$this->length = $length;
+		if ($start === 0) {
+			$this->totalSize = $length;
+		}
 
 		return true;
 	}
@@ -211,7 +218,9 @@ public function stream_tell() {
 
 	public function stream_stat() {
 		if ($this->getCurrent()) {
-			return fstat($this->getCurrent());
+			$stat = fstat($this->getCurrent());
+			$stat['size'] = $this->totalSize;
+			return $stat;
 		} else {
 			return false;
 		}